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French National Centre for Scientific Research
Interactions, particles, nucleus, from the laboratory to the cosmos - National Institute of nuclear physic and particles physic (IN2P3)
Dirk Zerwas

Dirk Zerwas
Ph.D.
Directeur de Recherche at French National Centre for Scientific Research

About

710

Publications

335,910

Reads

25,848

Citations

French National Centre for Scientific Research

Interactions, particles, nucleus, from the laboratory to the cosmos - National Institute of nuclear physic and particles physic (IN2P3)
Paris, France

Current position

Directeur de Recherche

February 1995 - April 1998

LAL, Université Paris-Sud

Field of study

Particle Physics

Publications

Shower separation in five dimensions for highly granular calorimeters using machine learning

Article

Oct 2024

To achieve state-of-the-art jet energy resolution for Particle Flow, sophisticated energy clustering algorithms must be developed that can fully exploit available information to separate energy deposits from charged and neutral particles. Three published neural network-based shower separation models were applied to simulation and experimental data...

Figure 1: Pictures showing the CALICE AHCAL at testbeam. Fig. 1a shows...

Figure 2: Event displays of simulated π − hadron showers demonstrating...

Figure 4: Figs. 4a, 4c, 4e (left) and Figs. 4b, 4d, 4f (right) show the...

Figure 6: Skewness as a function of charged and neutral shower energy....

Figure 11: Figures 11a, 11d, 11g and Figures 11b, 11e, 11h show the...

Shower Separation in Five Dimensions for Highly Granular Calorimeters using Machine Learning

Preprint

Full-text available

Jun 2024

Figure 1. Pictures showing the CALICE AHCAL at testbeam. Figure 1(a)...

Figure 2. Diagram illustrating the modified event coordinate system....

Figure 3. Illustration of a method for software compensation by which...

Figure 5. Histogram showing the ten decile bin ranges of the í...

Figure 6. Figure 6(a) and figure 6(b) show the reconstructed AHCAL...

Software compensation for highly granular calorimeters using machine learning

Article

Full-text available

Apr 2024

A neural network for software compensation was developed for the highly granular CALICE Analogue Hadronic Calorimeter (AHCAL). The neural network uses spatial and temporal event information from the AHCAL and energy information, which is expected to improve sensitivity to shower development and the neutron fraction of the hadron shower. The neural...

Figure 1. Schematic view of an ILD barrel sector.

Figure 6. (a) Distribution of the temperature coefficient for breakdown...

Figure 7. Photo of one AHCAL module consisting of 2 × 2 inter-connected...

Figure 8. Example of the low amplitude region of the reconstructed hit...

Figure 10. A typical MIP Spectrum for one channel after pedestal...

Design, construction and commissioning of a technological prototype of a highly granular SiPM-on-tile scintillator-steel hadronic calorimeter

Article

Full-text available

Nov 2023

The CALICE collaboration is developing highly granular electromagnetic and hadronic calorimeters for detectors at future energy frontier electron-positron colliders. After successful tests of a physics prototype, a technological prototype of the Analog Hadron Calorimeter has been built, based on a design and construction techniques scalable to a co...

Energy reconstruction of hadronic showers at the CERN PS and SPS using the Semi-Digital Hadronic Calorimeter

Article

Jul 2022

The CALICE Semi-Digital Hadronic CALorimeter (SDHCAL) is the first technological prototype in a family of high-granularity calorimeters developed by the CALICE Collaboration to equip the experiments of future lepton colliders. The SDHCAL is a sampling calorimeter using stainless steel for absorber and Glass Resistive Plate Chambers (GRPC) as a sens...

A high-granularity timing detector for the ATLAS phase-II upgrade: Technical design report

Article

Full-text available

Jan 2022

Figure 1: Result from the global Higgs analysis in terms of coupling...

Figure 3: Correlations between the leading operators describing Higgs...

The Global Higgs Picture at 27 TeV

Article

Full-text available

Feb 2019

We estimate the reach of global Higgs analyses at a 27 TeV hadron collider in terms of Higgs couplings and in terms of a gauge-invariant effective Lagrangian, including invisible Higgs decays and the Higgs self-coupling. The new collider will indirectly probe new physics in the TeV range and allow for a meaningful test of the Higgs self-coupling al...

Beam test measurements of Low Gain Avalanche Detector single pads and arrays for the ATLAS High Granularity Timing Detector

Preprint

Full-text available

Apr 2018

For the high luminosity upgrade of the LHC at CERN, ATLAS is considering the addition of a High Granularity Timing Detector (HGTD) in front of the end cap and forward calorimeters at |z| = 3.5 m and covering the region 2.4 < |{\eta}| < 4 to help reducing the effect of pile-up. The chosen sensors are arrays of 50 {\mu}m thin Low Gain Avalanche Detec...

Construction and Response of a Highly Granular Scintillator-based Electromagnetic Calorimeter

Preprint

Jul 2017

A highly granular electromagnetic calorimeter with scintillator strip readout is being developed for future lepton collider experiments. A prototype of 21.5 $X_0$ depth and $180 \times 180 $mm$^2$ transverse dimensions was constructed, consisting of 2160 individually read out $10 \times 45 \times 3$ mm$^3$ scintillator strips. This prototype was te...

Higgs Factories: Higgs-Strahlung versus W-Fusion

Article

Jun 2017

Higgs factories will be able to measure Higgs properties, and in particular Higgs couplings with high precision. In a follow-up to an earlier analysis we study the impact of the Higgs-strahlung and vector boson fusion processes on the precision of the couplings determination. Provided theoretical uncertainties can be controlled, future Higgs factor...

Higgs Factories: Higgs-Strahlung versus W-Fusion

Preprint

Jun 2017

Measurement of the inclusive isolated prompt photon cross section in pp collisions at root s=7 TeV with the ATLAS detector

Article

Full-text available

Aug 2016

A measurement of the cross section for the inclusive production of isolated prompt photons in proton-proton collisions at a centre-of-mass energy of $ \sqrt{s}=8 $ TeV is presented. The measurement covers the pseudorapidity ranges |η γ | < 1.37 and 1.56 ≤ |η γ | < 2.37 in the transverse energy range 25 < E T γ < 1500 GeV. The results are based on...

DHCAL with Minimal Absorber: Measurements with Positrons

Preprint

Full-text available

Mar 2016

In special tests, the active layers of the CALICE Digital Hadron Calorimeter prototype, the DHCAL, were exposed to low energy particle beams, without being interleaved by absorber plates. The thickness of each layer corresponded approximately to 0.29 radiation lengths or 0.034 nuclear interaction lengths, defined mostly by the copper and steel skin...

Linking the Galactic Center excess to invisible Higgs boson decays in the NMSSM

Article

Jan 2016

The Galactic Center excess of gamma ray photons can be naturally explained by light Majorana fermions in combination with a pseudoscalar mediator. The next-to-minimal supersymmetric Standard Model (NMSSM) provides exactly these ingredients. We show that for neutralinos with a significant singlino component the Galactic Center excess can be linked t...

Invisible Higgs Decays to Hooperons in the NMSSM

Article

Jul 2015

The galactic center excess of gamma ray photons can be naturally explained by light Majorana fermions in combination with a pseudoscalar mediator. The NMSSM provides exactly these ingredients. We show that for neutralinos with a significant singlino component the galactic center excess can be linked to invisible decays of the Standard-Model-like Hi...

Search for a Charged Higgs Boson Produced in the Vector-boson Fusion Mode with Decay

H^\pm \to W^\pm Z

using pp Collisions at

\sqrt{s}=8

TeV with the ATLAS Experiment

Article

Mar 2015

See paper for full list of authors - 8 pages plus author list + cover pages (27 pages total), 3 figures, 9 tables, submitted to PRL, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2014-13

Search for a Heavy Neutral Particle Decaying to eμ, eτ, or μτ in pp Collisions at s√=8 TeV with the ATLAS Detector

Article

Jan 2015

See paper for full list of authors - 8 pages plus author list + cover pages (25 pages total), 2 figures, 1 tables, submitted to Physical Review Letters, All figures including auxiliary figures are available at this http URL

Search for high-mass diboson resonances with boson-tagged jets in proton-proton collisions at s√ = 8 TeV with the ATLAS detector

Article

Jan 2015

21 pages plus author list + cover pages (37 pages total), 6 figures, 6 table, submitted to JHEP, All figures including auxiliary figures are available at this http URL - See paper for full list of authors

Search for a new resonance decaying to a W or Z boson and a Higgs boson in the

\ell \ell/ \ell \nu/ \nu \nu + b \bar{b}

final states with the ATLAS Detector

Article

Jan 2015

See paper for full list of authors – 14 pages plus author list + cover pages (30 pages total), 4 figures, 1 tables, submitted to EPJC, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2013-23/

Search for production of vector-like quark pairs and of four top quarks in the lepton-plus-jets final state in pp collisions at s√=8 TeV with the ATLAS detector

Article

Jan 2015

67 pages + author list + cover pages (84 pages total), 33 figures, 10 tables, submitted to JHEP. All figures including auxiliary figures are available at this http URL - See paper for full list of authors

Measurement of differential

J/\psi

production cross-sections and forward-backward ratio in p+Pb collisions with the ATLAS detector

Article

Jan 2015

See paper for full list of authors - 13 pages plus author list + cover pages (26 pages total), 8 figures, 8 tables, submitted to Phys. Rev. C. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2013-07/

Search for W′→tb¯ in the lepton plus jets final state in proton-proton collisions at a centre-of-mass energy of √s = 8 TeV with the ATLAS detector

Article

Jan 2015

See paper for full list of authors –

Search for the Xb and other hidden-beauty states in the π+π−Υ(1S) channel at ATLAS

Article

Jan 2015

See paper for full list of authors –

Evidence for the Higgs-boson Yukawa coupling to tau leptons with the ATLAS detector

Article

Jan 2015

See paper for full list of authors – 61 pages plus author list + cover pages (83 pages total), 15 figures, 17 tables, submitted to Journal of High Energy Physics, All figures including auxiliary figures are availbale at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2013-32/

Search for the

b\bar{b}

decay of the Standard Model Higgs boson in associated (W/Z)H production with the ATLAS detector

Article

Jan 2015

See paper for full list of authors - 69 pages plus author list + cover pages (93 pages total), 25 figures, 11 tables, submitted to JHEP, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2013-23/

Search for charged Higgs bosons decaying via

H^{\pm} \rightarrow \tau^{\pm}\nu

in fully hadronic final states using pp collision data at

\sqrt{s} = 8

TeV with the ATLAS detector

Article

Jan 2015

See paper for full list of authors – 27 pages plus author list + cover pages (50 pages total), 8 figures, 5 tables, submitted to JHEP, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2013-30/

Measurement of the transverse polarization of

\Lambda

and

\bar{\Lambda}

hyperons produced in proton--proton collisions at

\sqrt{s}=7

TeV using the ATLAS detector

Article

Jan 2015

See paper for full list of authors – 10 pages plus author list + cover pages (23 pages total), 8 figures, 3 tables, submitted to Phys. Rev. D, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2011-45/

Observation of top-quark pair production in association with a photon and measurement of the

t\bar{t}\gamma

production cross section in pp collisions at

\sqrt{s}=7

TeV using the ATLAS detector

Article

Jan 2015

See paper for full list of authors – 16 pages plus author list + cover pages (29 pages total), 7 figures, 4 tables, submitted to PRD, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2012-07/

Measurement of the inclusive jet cross-section in proton-proton collisions at

\sqrt{s}=7

TeV using 4.5 fb

^{-1}

of data with the ATLAS detector

Article

Jan 2015

See paper for full list of authors – 41 pages plus author list + cover page (63 pages total), 13 figures, 14 tables, submitted to JHEP, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2013-11/

Two-particle Bose-Einstein correlations in pp collisions at

\mathbf {\sqrt{s} =}

0.9 and 7 TeV measured with the ATLAS detector

Article

Jan 2015

See paper for full list of authors – Comments: 13 pages plus author list + cover pages (26 pages total), 6 figures, 2 tables, submitted to Eur. Phys. J. C. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2013-01/

Search for New Phenomena in Dijet Angular Distributions in Proton-Proton Collisions at

\sqrt{s} = 8

TeV Measured with the ATLAS Detector

Article

Jan 2015

See paper for full list of authors – 4 pages plus author list + cover pages (17 pages total), 1 figures, submitted to PRL, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2014-15/

Search for Higgs bosons decaying to aa in the

\mu\mu\tau\tau

final state in pp collisions at

\sqrt{s} =

8 TeV with the ATLAS experiment

Article

Jan 2015

See paper for full list of authors – 11 pages plus author list + cover pages (24 pages total), 6 figures, 4 tables, submitted to Phys. Rev. D, All figures including auxillary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2014-02/

Measurement of the top quark mass in the

t\bar t \to {\rm lepton+jets}

and

t\bar t \to {\rm dilepton}

channels using

\sqrt{s}=7

TeV ATLAS data

Article

Jan 2015

See paper for full list of authors – 35 pages plus author list + cover pages (51 pages total), 6 figures, 4 tables, submitted to EPJC, all figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2013-02/

Search for new light gauge bosons in Higgs boson decays to four-lepton final states in pp collisions at

\sqrt{s}=8

TeV with the ATLAS detector at the LHC

Article

Jan 2015

See paper for full list of authors – 33 pages plus author list (49 pages total), 16 figures, 5 tables, submitted to Phys. Rev. D, All figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2013-15/

Measurement of the forward-backward asymmetry of electron and muon pair-production in pp collisions at

\sqrt{s}

= 7 TeV with the ATLAS detector

Article

Jan 2015

See paper for full list of authors – 25 pages plus author list + cover pages (42 pages total), 7 figures, 4 tables, submitted to JHEP, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2011-34/

Evidence of

W\gamma\gamma

production in pp collisions at

\sqrt{s}=8

TeV and limits on anomalous quartic gauge couplings with the ATLAS detector

Article

Jan 2015

See paper for full list of authors – 8 pages plus author list + cover pages (25 pages total), 1 figure, 4 tables, submitted to PRL, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2013-05

A search for high-mass resonances decaying to

\tau^{+}\tau^{-}

in pp collisions at

\sqrt{s}=8

TeV with the ATLAS detector

Article

Jan 2015

See paper for full list of authors – 27 pages plus author list + cover pages (49 pages total), 9 figures, 4 tables, submitted to JHEP, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2014-05/

Search for a CP-odd Higgs boson decaying to Zh in pp collisions at

\sqrt{s} = 8

TeV with the ATLAS detector

Article

Jan 2015

See paper for full list of authors – 13 pages plus author list + cover pages (30 pages total), 5 figures, 2 tables, submitted to Phys. Lett. B, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2013-06/

Search for long-lived, multi-charged particles in pp collisions at sqrt(s)=7 TeV using the ATLAS detector

Article

Jan 2015

17 pages plus author list + cover pages (35 pages total), 8 figures, 4 tables, submitted to Eur. Phys. J. C, All figures including auxiliary figures are available at this https URL - See paper for full list of authors

Search for Scalar Charm Quark Pair Production in pp Collisions at s√=8 TeV with the ATLAS Detector

Article

Jan 2015

See paper for full list of authors – Comments: 5 pages plus author list + cover page (19 pages total), 2 figures, 1 table, submitted to Phys. Rev. Lett., All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2014-03

Measurement of charged-particle spectra in Pb+Pb collisions at sNN−−−√=2.76 TeV with the ATLAS detector at the LHC

Article

Jan 2015

36 pages plus author list + cover pages (57 pages total), 18 figures, 4 tables, submitted to JHEP. All figures including auxiliary figures are available at this https URL. See paper for full list of authors

Determination of the off-shell Higgs boson signal strength in the high-mass ZZ and WW final states with the ATLAS detector

Article

Jan 2015

See paper for full list of authors – 35 pages plus author list + cover pages (52 pages total), 12 figures, 6 tables, submited to The European Physical Journal C, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2014-10

Search for invisible decays of the Higgs boson produced in association with a hadronically decaying vector boson in pp collisions at s√ = 8 TeV with the ATLAS detector

Article

Jan 2015

14 pages plus author list + cover pages (36 pages total), 6 figures, 5 tables, submitted to EPJC, All figures including auxiliary figures are available at this https URL - See paper for full list of authors

Search for Higgs boson pair production in the

b\bar{b} b\bar{b}

final state from pp collisions at

\sqrt{s} = 8

TeV with the ATLAS detector

Article

Jan 2015

32 pages plus author list + cover pages (49 pages total), 18 figures, 9 tables, submitted to EPJC. All figures including auxiliary figures are available at this http URL - See paper for full list of authors

Measurements of Higgs boson production and couplings in the four-lepton channel in pp collisions at center-of-mass energies of 7 and 8 TeV with the ATLAS detector

Article

Jan 2015

See paper for full list of authors - 40 pages plus author list + cover pages (54 pages total), 21 figures, 12 tables, submitted to Physical Review D, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2013-21/

Measurement of exclusive

\gamma\gamma\rightarrow \ell^+\ell^-

production in proton-proton collisions at

\sqrt{s} = 7

TeV with the ATLAS detector

Article

Jan 2015

See paper for full list of authors - 12 pages + references + author list + cover pages (34 pages total), 4 figures, 3 tables, submitted to Phys. Lett. B, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2014-13/

Measurements of the Nuclear Modification Factor for Jets in Pb+Pb Collisions at

\sqrt{s_{\mathrm{NN}}}=2.76

TeV with the ATLAS Detector

Article

Jan 2015

See paper for full list of authors – 6 pages + author list + cover page (19 pages total), 4 figures, 1 table, submitted to Physical Review Letters, all figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2013-06/

Determination of the top-quark pole mass using

t \bar{t}+1

-jet events collected with the ATLAS experiment in 7 TeV pp collisions

Article

Jan 2015

See paper for full list of authors – 23 pages plus author list (39 pages total), 5 figures, 4 tables, submitted to JHEP, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2014-06/

Search for an additional, heavy Higgs boson in the

H\rightarrow ZZ

decay channel at

\sqrt{s}

= 8 TeV in pp collision data with the ATLAS detector

Article

Jan 2015

46 pages plus author list + cover pages (62 pages total), 17 figures, 4 tables, submitted to EPJC. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2013-20/. See paper for full list of authors

boson production in

Pb collisions at

\sqrt{s_{NN}}=5.02$ TeV measured with the ATLAS detector

Article

Jan 2015

19 pages plus author list + cover pages (36 pages total), 9 figures, 3 tables, submitted to Physical Review C, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2013-09/ ; see paper for full list of authors.

Summary of the searches for squarks and gluinos using

\sqrt{s}

= 8 TeV pp collisions with the ATLAS experiment at the LHC

Article

Jan 2015

91 pages plus author list (107 pages total), 43 figures, 23 tables, submitted to JHEP, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2014-06/. See paper for full list of authors

Search for photonic signatures of gauge-mediated supersymmetry in 8 TeV pp collisions with the ATLAS detector

Article

Jan 2015

43 pages plus author list (60 pages total), 12 figures, 9 tables, submitted to Phys. Rev. D. All figures and tables, including auxiliary material, are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2014-01/. See paper for full list of authors.

Search for heavy Majorana neutrinos with the ATLAS detector in pp collisions at

\sqrt{s} = 8

TeV

Article

Jan 2015

See paper for full list of authors - 28 pages plus author list (44 pages total), 11 figures, 6 tables, submitted to JHEP, all figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2012-24/

Search for the associated production of the Higgs boson with a top quark pair in multilepton final states with the ATLAS detector

Article

Jan 2015

See paper for full list of authors - 14 pages plus author list + cover pages (26 pages total), 3 figures, 5 tables, submitted to Phys. Lett. B, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2013-26/

Measurement of the top quark pair production cross section in pp collisions at s√=7 TeV in the ℓ+τ channel and of the top quark branching ratios into channels with leptons and quarks with the ATLAS detector

Article

Jan 2015

33 pages plus author list (49 pages total), 11 figures, 9 tables, submitted to Physical Review D - See paper for full list of authors

Measurement of colour flow with the jet pull angle in tt¯ events using the ATLAS detector at s√=8 TeV

Article

Jan 2015

15 pages plus author list + cover pages (31 pages total), 5 figures, 4 tables, submitted to Physics Letters B - See paper for full list of authors

Search for invisible particles produced in association with single-top-quarks in proton-proton collisions at

\sqrt{s}

= 8 TeV with the ATLAS detector

Article

Jan 2015

See paper for full list of authors – 14 pages plus author list + cover pages (27 pages total), 7 figures, 3 tables, submitted to EPJC, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2013-11/

Measurement of the

t\bar{t}

production cross-section as a function of jet multiplicity and jet transverse momentum in 7 TeV proton-proton collisions with the ATLAS detector

Article

Jan 2015

52 pages plus author list + cover pages (75 pages total), 17 figures, 13 tables, submitted to JHEP, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2012-03/ - See paper for full list of authors

Search for new phenomena in the dijet mass distribution using pp collision data at

\sqrt{s}=8

TeV with the ATLAS detector

Article

Jan 2015

12 pages plus author list (25 pages total), 11 figures, 2 tables, submitted to Phys. Rev. D., All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2013-11/ - See paper for full list of authors

Measurements of the W production cross sections in association with jets with the ATLAS detector

Article

Jan 2015

See paper for full list of authors - 8 pages plus author list + cover pages (51 pages total), 38 figures, 7 tables, submitted to EPCJ, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2012-24/

Search for Higgs and Z Boson Decays to

J/\psi\gamma

and

\Upsilon(nS)\gamma

with the ATLAS Detector

Article

Jan 2015

See paper for full list of authors – 6 pages plus author list + cover pages (20 pages total), 2 figures, 2 tables, submitted to PRL, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2014-03/

Measurement of three-jet production cross-sections in pp collisions at 7 TeV centre-of-mass energy using the ATLAS detector

Article

Jan 2015

See paper for full list of authors – 22 pages plus author list + cover pages (33 pages total), 8 figures, 10 tables, submitted to Eur. Phys. J. C, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2013-09/

Performance of the ATLAS muon trigger in pp collisions at

\sqrt{s}=8

TeV

Article

Jan 2015

See paper for full list of authors - 19 pages plus author list (34 pages total), 17 figures, 4 tables, submitted to European Physics Journal C, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TRIG-2012-03

Measurement of the charge asymmetry in dileptonic decays of top quark pairs in pp collisions at s√=7 TeV using the ATLAS detector

Article

Jan 2015

33 pages plus author list + cover pages (56 pages total), 8 figures, 11 tables, submitted to JHEP, all figures including auxiliary figures are available at this https URL. See paper for full list of authors

Search for low-scale gravity signatures in multi-jet final states with the ATLAS detector at

\sqrt{s} = 8

TeV

Article

Jan 2015

See paper for full list of authors – 23 pages plus author list + cover page (45 pages total), 8 figures, no tables, submitted to JHEP, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2014-02/

Search for resonant diboson production in the

\ell\ell q\bar{q}

final state in pp collisions at

\sqrt{s} = 8

TeV with the ATLAS detector

Article

Jan 2015

See paper for full list of authors - 8 pages + author list + cover page (23 pages total), 2 figures, 2 tables, submitted to EPJC, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2013-06/

Search for pair-produced long-lived neutral particles decaying to jets in the ATLAS hadronic calorimeter in pp collisions at s√ = 8 TeV

Article

Full-text available

Jan 2015

See paper for full list of authors – 10 pages plus author list + cover pages (22 pages total), 6 figures, 4 tables, submitted to Physics Letters B, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2012-28

Search for massive supersymmetric particles decaying to many jets using the ATLAS detector in pp collisions at

\sqrt{s} = 8

TeV

Article

Jan 2015

See paper for full list of authors – 22 pages plus author list + cover pages (34 pages total), 15 figures, 7 tables, submitted to PRD. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2013-07/

Search for supersymmetry in events containing a same-flavour opposite-sign dilepton pair, jets, and large missing transverse momentum in

\sqrt{s}=8

TeV pp collisions with the ATLAS detector

Article

Jan 2015

See paper for full list of authors – 44 pages plus author list (61 pages total), 13 figures, 18 tables, submitted to Eur. Phys. J. C, all figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2014-10/

Search for massive, long-lived particles using multitrack displaced vertices or displaced lepton pairs in pp collisions at

\sqrt{s}

= 8 TeV with the ATLAS detector

Article

Jan 2015

See paper for full list of authors - 25 pages plus author list + cover pages (38 pages total), 20 figures, 3 tables, submitted to Phys. Rev. D, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2014-02/

Measurement of the top pair production cross-section in 8 TeV proton-proton collisions using kinematic information in the lepton+jets final state with ATLAS

Article

Jan 2015

17 pages plus author list + cover pages (34 pages total), 3 figures, 2 tables, submitted to Physical Review D, All figures including auxiliary figures are available at this http URL-See paper for full list of authors

Search for W′→tb→qqbb decays in pp collisions at s√ = 8 TeV with the ATLAS detector

Article

Jan 2015

See paper for full list of authors - 10 pages plus author list + cover page (24 pages total), 7 figures, 3 tables, submitted to European Physical Journal C, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2013-14

Measurement of Spin Correlation in Top-Antitop Quark Events and Search for Top Squark Pair Production in pp Collisions at

\sqrt{s}=8

TeV Using the ATLAS Detector

Article

Jan 2015

See paper for full list of authors – 7 pages plus author list + cover pages (20 pages total), 2 figures, 2 tables, submitted to PRL, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2014-07/

Search for single top-quark production via flavour changing neutral currents at 8 TeV with the ATLAS detector

Article

Jan 2015

See paper for full list of authors, submitted to EPJC

Search for a high-mass Higgs boson decaying to a W boson pair in pp collisions at s√=8 TeV with the ATLAS detector

Article

Jan 2015

See paper for full list of authors, submitted to JHEP

Centrality and rapidity dependence of inclusive jet production in

\sqrt{s_\mathrm{NN}} = 5.02

TeV proton--lead collisions with the ATLAS detector

Article

Dec 2014

See paper for full list of authors – 14 pages plus author list + cover pages (30 pages total), 8 figures, 1 table, submitted to Phys. Lett B, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2013-08/

Observation of charmless hadronic B decays

Article

Full-text available

Oct 2014

Four candidates for charmless hadronic B decay are observed in a data sample of four million hadronic Z decays recorded by the aleph detector at lep. The probability that these events come from background sources is estimated to be less than 10−6. The average branching ratio of weakly decaying B hadrons (a mixture of Bd0, Bs0 and Λb weighted by the...

Search for single top production in e+e− collisions at –202 GeV

Article

Oct 2014

Single top production via flavour changing neutral currents in the reactions is searched for in approximately 411 pb−1 of data collected by ALEPH at centre-of-mass energies in the range between 189 and 202 GeV. In total, 58 events are selected in the data to be compared with 50.3 expected from Standard Model backgrounds. No deviation from the Stand...

Bose-Einstein correlations in W-pair decays

Article

Oct 2014

Bose-Einstein correlations are studied in semileptonic () and fully hadronic () W-pair decays with the ALEPH detector at LEP at centre-of-mass energies of 172, 183 and 189 GeV. They are compared with those made at the Z peak after correction for the different flavour compositions. A Monte Carlo model of Bose-Einstein correlations based on the JETSE...

Searches for sleptons and squarks in e+e− collisions at 189 GeV

Article

Oct 2014

The data collected at a centre-of-mass energy of 188.6 GeV by ALEPH at LEP, corresponding to an integrated luminosity of 173.6 pb(-1), are analysed in a search for the scalar partners of quarks and leptons predicted in supersymmetric models. No evidence for any such particles was found in the decay channels (l) over tilde --> l chi, (t) over tilde...

Determination of the LEP centre-of-mass energy from Zγ events

Article

Oct 2014

Radiative returns to the Z resonance (Z gamma events) are used to determine the LEP2 centre-of-mass energy from the data collected with the ALEPH detector in 1997. The average centre-of-mass energy is measured to he: E(CM) = 182.50 +/- 0.19(stat.) +/- 0.08 (syst.) GeV in good agreement with the precise determination by the LEP energy working group...

Mass limit for the standard model Higgs boson with the full LEP I ALEPH data sample

Article

Oct 2014

The reaction e+e− → HZ∗ is used to search for the standard model Higgs boson in the and the Hℓ+ℓ− channels. The data sample corresponds to about 4.5 million hadronic Z decays collected by the ALEPH experiment at LEP from 1989 to 1995 at centre-of-mass energies at and around the Z peak. Three candidate events are found in the Hμ+μ− channel, in agree...

Search for the standard model Higgs boson at the LEP2 Collider near s=183 GeV

Article

Oct 2014

During 1997 the ALEPH experiment at LEP gathered 57 pb(-1) of data at centre-of-mass energies near 183 GeV. These data are used to look for possible signals from the production of the Standard Model Higgs boson in the reaction e(+)e(-) --> HZ. No evidence of a signal is found in the data; seven events are selected, in agreement with the expectation...

Search for the glueball candidates f0(1500) and fJ(1710) in γγ collisions

Article

Oct 2014

Data taken with the ALEPH detector at LEP1 have been used to search for gamma gamma production of the glueball candidates f(0)(1500) and f(j)(1710) via their decay to pi(+)pi(-). No signal is observed and upper limits to the product of gamma gamma width and pi(+)pi(-) branching ratio of the f(0)(1500) and the f(j)(1710) have been measured to be Gam...

Search for sleptons in e+e− collisions at centre-of-mass energies of 161 GeV and 172 GeV

Article

Full-text available

Oct 2014

The data recorded by the ALEPH experiment at LEP at centre-of-mass energies of 161 GeV and 172 GeV were analysed to search for sleptons, the supersymmetric partners of leptons. No evidence for the production of these particles was found. The number of candidates observed is consistent with the background expected from four-fermion processes and γγ-...

Searches for neutral Higgs bosons in e+e− collisions at centre-of-mass energies from 192 to 202 GeV

Article

Oct 2014

Searches for neutral Higgs bosons are performed with the 237 pb−1 of data collected in 1999 by the ALEPH detector at LEP, for centre-of-mass energies between 191.6 and 201.6 GeV. These searches apply to Higgs bosons within the context of the Standard Model and its minimal supersymmetric extension (MSSM) as well as to invisibly decaying Higgs bosons...

Study of the CP asymmetry of B0→J/ψ K0S decays in ALEPH

Article

Oct 2014

The decay is reconstructed with J/ψ→e+e− or μ+μ− and K0S→π+π−. From the full ALEPH dataset at LEP1 of about 4 million hadronic Z decays, 23 candidates are selected with an estimated purity of 71%. They are used to measure the CP asymmetry of this decay, given by sin2β in the Standard Model, with the result . This is combined with existing measureme...

Measurement of the branching fraction for D0 → K−π+

Article

Oct 2014

The branching fraction for D0 → K−π+ is measured with the statistics collected by ALEPH from 1991 to 1994. The method is based on the comparison between the rate for the reconstructed , D0 → K−π+ decay chain and the rate for inclusive soft pion production at low transverse momentum with respect to the nearest jet. The result is B(D0 → K−π+0 = (3.90...

Constraining supersymmetry using the relic density and the Higgs boson

Conference Paper

Full-text available

Sep 2014

Measurement of the 4l Cross Section at the Z Resonance and Determination of the Branching Fraction of Z->4l in pp Collisions at sqrt(s) = 7 and 8 TeV with ATLAS

Article

Mar 2014

See paper for full list of authors - 6 pages plus author list (20 pages total), 2 figures, 1 table, submitted to PRL, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2013-08/

Constraining Supersymmetry using the relic density and the Higgs boson

Article

Full-text available

Feb 2014

Recent measurements by Planck, LHC experiments, and Xenon100 have significant impact on supersymmetric models and their parameters. We first illustrate the constraints in the mSUGRA plane and then perform a detailed analysis of the general minimal supersymmetric Standard Model (MSSM) with 13 free parameters. Using SFitter, Bayesian and profile like...

Measurement of chi_c1 and chi_c2 production with sqrt(s) = 7 TeV pp collisions at ATLAS

Article

Jan 2014

See paper for full list of authors - 38 pages plus author list (62 pages total), 10 figures, 13 tables, submitted to JHEP, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2013-05/

Measurement of Higgs boson production in the diphoton decay channel in pp collisions at center-of-mass energies of 7 and 8 TeV with the ATLAS detector

Article

Jan 2014

See paper for full list of authors - 32 pages plus author list + cover pages (46 pages total), 21 figures, 14 tables, submitted to Physical Review D, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2013-08/

Measurement of the production cross-section of

\psi(2S)\to J/\psi(\to\mu^+\mu^-)\pi^+\pi^-

in pp collisions at

\sqrt{s}=7

TeV at ATLAS

Article

Jan 2014

See paper for full list of authors - 35 pages plus author list + cover pages (58 pages total), 14 figures, 8 tables, submitted to JHEP, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2013-06/

Measurement of long-range pseudorapidity correlations and azimuthal harmonics in

\sqrt{s_{\mathrm{NN}}}

= 5.02 TeV proton-lead collisions with the ATLAS detector

Article

Jan 2014

See paper for full list of authors - 21 pages plus author list + cover pages (34 pages total), 16 figures, submitted to Phys. Rev. C., All figures including auxiliary figures can be found at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2013-04/

Search for new resonances in

W\gamma

and

Z\gamma

Final States in pp Collisions at

\sqrt{s}=8

TeV with the ATLAS Detector

Article

Jan 2014

See paper for full list of authors - 10 pages plus author list + cover pages (23 pages total), 3 figures, 2 tables, submitted to PLB, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2013-09/

Measurement of the Higgs boson mass from the

H\rightarrow \gamma\gamma

and

H \rightarrow ZZ^{*} \rightarrow 4\ell

channels with the ATLAS detector using 25 fb

^{-1}

of pp collision data

Article

Jan 2014

See paper for full list of authors - 25 pages plus author list + cover pages (38 pages total), 9 figures, 5 tables, submitted to Physical Review D, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2013-12/

Flavour tagged time-dependent angular analysis of the

B_s \rightarrow J/\psi \phi

decay and extraction of

\Delta\Gamma

and the weak phase

\phi_s

in ATLAS

Article

Jan 2014

26 pages plus author list + cover pages (54 pages total), 9 figures, 7 tables, submitted to PRD, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2013-01/ - See paper for full list of authors

Measurements of fiducial and differential cross sections for Higgs boson production in the diphoton decay channel at

\sqrt{s}=8

TeV with ATLAS

Article

Jan 2014

See paper for full list of authors - 3 pages plus cover page plus author list (65 pages total), 13 figures, 10 tables, submitted to JHEP, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2013-10/

Search for squarks and gluinos with the ATLAS detector in final states with jets and missing transverse momentum using

\sqrt{s}=8

TeV proton--proton collision data

Article

Jan 2014

See paper for full list of authors - 36 pages plus author list + cover pages (54 pages total), 13 figures, 5 tables, submitted to JHEP, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2013-02/