B. Abbott’s research while affiliated with University of Oklahoma and other places

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Publications (646)


The principle of the η annotation (left) and the various fi(η) functions (right). The vertical shaded band on the right plot marks the calorimeter transition region.
The architecture of the DNN.
The loss evolution for the training (plain lines) and validation (dotted lines) data samples. The different spikes and drops correspond to the transitions between training steps (see table 3) and are due to the variations of the loss function.
Jet energy (left) and mass (right) responses (a)–(d) and resolutions (e), (f) for different calibrations (squares: no calibration, triangles: standard calibration, circles: DNN calibration) as a function of pTtrue (a), (b), (e), (f) and ηtrue (c), (d). The horizontal bands in (a)–(d) represent 1 % (dark) and 5 % (light) up and down divergences from closure.
The (a) jet energy and (b) mass calibrated response for the DNN calibration as a function of ηtrue and for multiple bins in pTtrue. The horizontal bands represent 1 % (dark) and 5 % (light) up and down divergences from closure.

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Simultaneous energy and mass calibration of large-radius jets with the ATLAS detector using a deep neural network
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September 2024

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39 Reads

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2 Citations

G Aad

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E Aakvaag

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B Abbott

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L Zwalinski

The energy and mass measurements of jets are crucial tasks for the Large Hadron Collider experiments. This paper presents a new calibration method to simultaneously calibrate these quantities for large-radius jets measured with the ATLAS detector using a deep neural network (DNN). To address the specificities of the calibration problem, special loss functions and training procedures are employed, and a complex network architecture, which includes feature annotation and residual connection layers, is used. The DNN-based calibration is compared to the standard numerical approach in an extensive series of tests. The DNN approach is found to perform significantly better in almost all of the tests and over most of the relevant kinematic phase space. In particular, it consistently improves the energy and mass resolutions, with a 30% better energy resolution obtained for transverse momenta pT>500 GeV.

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Search for heavy neutral Higgs bosons decaying into a top quark pair in 140 fb−1 of proton-proton collision data at s \sqrt{s} = 13 TeV with the ATLAS detector

August 2024

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22 Reads

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13 Citations

Journal of High Energy Physics

A bstract A search for heavy pseudo-scalar ( A ) and scalar ( H ) Higgs bosons decaying into a top-quark pair ( tt t\overline{t} t t ¯ ) has been performed with 140 fb − 1 of proton-proton collision data collected by the ATLAS experiment at the Large Hadron Collider at a centre-of-mass energy of s \sqrt{s} s = 13 TeV. Interference effects between the signal process and Standard Model (SM) tt t\overline{t} t t ¯ production are taken into account. Final states with exactly one or exactly two electrons or muons are considered. No significant deviation from the SM prediction is observed. The results of the search are interpreted in the context of a two-Higgs-doublet model (2HDM) of type II in the alignment limit with mass-degenerate pseudo-scalar and scalar Higgs bosons ( m A = m H ) and the hMSSM parameterisation of the minimal supersymmetric extension of the Standard Model. Ratios of the two vacuum expectation values, tan β , smaller than 3.49 (3.16) are excluded at 95% confidence level for m A = m H = 400 GeV in the 2HDM (hMSSM). Masses up to 1240 GeV are excluded for the lowest tested tan β value of 0.4 in the 2HDM. In the hMSSM, masses up to 950 GeV are excluded for tan β = 1.0. In addition, generic exclusion limits are derived separately for single scalar and pseudo-scalar states for different choices of their mass and total width.


Search for flavour-changing neutral-current couplings between the top quark and the Higgs boson in multi-lepton final states in 13 TeV pp collisions with the ATLAS detector

July 2024

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30 Reads

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8 Citations

The European Physical Journal C

A search is presented for flavour-changing neutral-current interactions involving the top quark, the Higgs boson and an up-type quark ( q=u,c q = u , c ) with the ATLAS detector at the Large Hadron Collider. The analysis considers leptonic decays of the top quark along with Higgs boson decays into two W W bosons, two Z Z bosons or a τ+τ\tau ^{+}\tau ^{-} τ + τ - pair. It focuses on final states containing either two leptons (electrons or muons) of the same charge or three leptons. The considered processes are ttˉt\bar{t} t t ¯ and Ht production. For the ttˉt\bar{t} t t ¯ production, one top quark decays via tHqt\rightarrow Hq t → H q . The proton–proton collision data set analysed amounts to (140fb1)({140}\,{\hbox {fb}^{-1}}) ( 140 fb - 1 ) at (s=13TeV)(\sqrt{s}={13}\,\hbox {TeV}) ( s = 13 TeV ) . No significant excess beyond Standard Model expectations is observed and upper limits are set on the tHqt\rightarrow Hq t → H q branching ratios at 95 % confidence level, amounting to observed (expected) limits of B(tHu)<2.8(3.0)×104\mathcal {B}(t\rightarrow Hu)<2.8\,(3.0) \times 10^{-4} B ( t → H u ) < 2.8 ( 3.0 ) × 10 - 4 and B(tHc)<3.3(3.8)×104\mathcal {B}(t\rightarrow Hc)<3.3\,(3.8) \times 10^{-4} B ( t → H c ) < 3.3 ( 3.8 ) × 10 - 4 . Combining this search with other searches for tHq tHq flavour-changing neutral-current interactions previously conducted by ATLAS, considering HbbˉH\rightarrow b\bar{b} H → b b ¯ and HγγH\rightarrow \gamma \gamma H → γ γ decays, as well as Hτ+τH\rightarrow \tau ^{+}\tau ^{-} H → τ + τ - decays with one or two hadronically decaying τ\tau τ -leptons, yields observed (expected) upper limits on the branching ratios of B(tHu)<2.6(1.8)×104\mathcal {B}(t\rightarrow Hu)<2.6\,(1.8) \times 10^{-4} B ( t → H u ) < 2.6 ( 1.8 ) × 10 - 4 and B(tHc)<3.4(2.3)×104\mathcal {B}(t\rightarrow Hc)<3.4\,(2.3) \times 10^{-4} B ( t → H c ) < 3.4 ( 2.3 ) × 10 - 4 .


Search for short- and long-lived axion-like particles in Haa4γH\rightarrow a a \rightarrow 4\gamma decays with the ATLAS experiment at the LHC

July 2024

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17 Reads

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12 Citations

The European Physical Journal C

Presented is the search for anomalous Higgs boson decays into two axion-like particles (ALPs) using the full Run 2 data set of 140fb1140\,\text {fb}^{-1} 140 fb - 1 of proton-proton collisions at a centre-of-mass energy of 13TeV13\,\text {TeV} 13 TeV recorded by the ATLAS experiment. The ALPs are assumed to decay into two photons, providing sensitivity to recently proposed models that could explain the (g2)μ(g-2)_\mu ( g - 2 ) μ discrepancy. This analysis covers an ALP mass range from 100 to 62GeV62\,\text {GeV} 62 GeV and ALP-photon couplings in the range 107TeV1<Caγγ/Λ<1TeV110^{-7}\,\text {TeV}^{-1}<C_{a\gamma \gamma }/\Lambda <1 \,\text {TeV}^{-1} 10 - 7 TeV - 1 < C a γ γ / Λ < 1 TeV - 1 , and therefore includes signatures with significantly displaced vertices and highly collinear photons. No significant excess of events above the Standard Model background is observed. Upper limits at 95% confidence level are placed on the branching ratio of the Higgs boson to two ALPs in the four-photon final state, and are in the range of 105 10^{-5} 10 - 5 to 3×1023\times 10^{-2} 3 × 10 - 2 , depending on the hypothesized ALP mass and ALP-photon coupling strength.


Fig. 1 FRVZ process in Higgs boson decays, with the dark fermion f d decaying into a γ d and an HLSP. The γ d decays into SM fermions, denoted by f and ¯ f
Fig. 4 Comparison of the relative uncertainty in the signal yield in each SR, showing the contributions from the different sources of uncertainty summed in quadrature. The quoted values are averaged over different γ d masses. The 'Muon uncertainties' category contains all muon-related systematic uncertainties and is dominated by the uncertainty in the single-γ d reconstruction efficiency. The 'NN taggers' category contains the three taggers adopted in the analysis and is dominated by the BIB
Fig. 6 Upper limits at 95% CL on the branching fraction as a function of the dark-photon mean proper decay length cτ for the H → 2γ d + X process, assuming a 125 GeV Higgs boson and a FRVZ signal model. The limits are shown separately for each channel and for the statistical
Definition of the signal regions in the μDPJ and caloDPJ channels. Selections on the DPJ are applied only to the leading one. The caloDPJ final state is further split into two signal regions, SR L c , and SR H c , with E miss T values of ∈ [100, 225] GeV and > 225 GeV respectively. Dashes indicate cases where a requirement is not applied
Observed and expected yields in the ABCD regions. The total uncertainty in the background expectation is computed by the ABCD background-only fit to unblinded data
Search for light long-lived neutral particles from Higgs boson decays via vector-boson-fusion production from pp collisions at s=13\sqrt{s}=13 TeV with the ATLAS detector

July 2024

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27 Reads

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4 Citations

The European Physical Journal C

A search is reported for long-lived dark photons with masses between 0.1 GeV and 15 GeV, from exotic decays of Higgs bosons produced via vector-boson-fusion. Events that contain displaced collimated Standard Model fermions reconstructed in the calorimeter or muon spectrometer are probed. This search uses the full LHC Run 2 (2015–2018) data sample collected in proton–proton collisions at s=13\sqrt{s}=13 s = 13 TeV, corresponding to an integrated luminosity of 139 fb1fb^{-1} f b - 1 . Dominant backgrounds from Standard Model processes and non-collision sources are estimated using data-driven techniques. The observed event yields in the signal regions are consistent with the expected background. Upper limits on the Higgs boson to dark photon branching fraction are reported as a function of the dark photon mean proper decay length or of the dark photon mass and the coupling between the Standard Model and the potential dark sector. This search is combined with previous ATLAS searches obtained in the gluon–gluon fusion and WH production modes. A branching fraction above 10% is excluded at 95% CL for a 125 GeV Higgs boson decaying into two dark photons for dark photon mean proper decay lengths between 173 and 1296 mm and mass of 10 GeV.


Improving topological cluster reconstruction using calorimeter cell timing in ATLAS

May 2024

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62 Reads

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1 Citation

The European Physical Journal C

Clusters of topologically connected calorimeter cells around cells with large absolute signal-to-noise ratio ( topo-clusters ) are the basis for calorimeter signal reconstruction in the ATLAS experiment. Topological cell clustering has proven performant in LHC Runs 1 and 2. It is, however, susceptible to out-of-time pile-up of signals from soft collisions outside the 25 ns proton-bunch-crossing window associated with the event’s hard collision. To reduce this effect, a calorimeter-cell timing criterion was added to the signal-to-noise ratio requirement in the clustering algorithm. Multiple versions of this criterion were tested by reconstructing hadronic signals in simulated events and Run 2 ATLAS data. The preferred version is found to reduce the out-of-time pile-up jet multiplicity by 50%{\sim }50\% ∼ 50 % for jet pT20p_{\textrm{T}}\sim 20 p T ∼ 20 GeV and by 80%{\sim }80\% ∼ 80 % for jet pT50p_{\textrm{T}} \gtrsim 50 p T ≳ 50 GeV, while not disrupting the reconstruction of hadronic signals of interest, and improving the jet energy resolution by up to 5% for 20<pT<3020< p_{\textrm{T}} < 30 20 < p T < 30 GeV. Pile-up is also suppressed for other physics objects based on topo-clusters (electrons, photons, τ\tau τ -leptons), reducing the overall event size on disk by about 6%6\% 6 % in early Run 3 pile-up conditions. Offline reconstruction for Run 3 includes the timing requirement.


Figure 4. Comparison of event yields between the observed data and the background expectation in the VRs. Figure (a): VRs containing no explicit requirement on the number of b-tagged jets. Figure (b): VRs containing at least two b-tagged jets. The bottom panel presents the ratio of data to the background prediction. The hatched pattern represents the combined statistical and systematic uncertainty in the background estimate.
A search for R-parity-violating supersymmetry in final states containing many jets in pp collisions at s \sqrt{s} = 13 TeV with the ATLAS detector

May 2024

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20 Reads

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5 Citations

Journal of High Energy Physics

A bstract A search for R-parity-violating supersymmetry in final states with high jet multiplicity is presented. The search uses 140 fb − 1 of proton-proton collision data at s \sqrt{s} s = 13 TeV collected by the ATLAS experiment during Run 2 of the Large Hadron Collider. The results are interpreted in the context of R-parity-violating supersymmetry models that feature prompt gluino-pair production decaying directly to three jets each or decaying to two jets and a neutralino which subsequently decays promptly to three jets. No significant excess over the Standard Model expectation is observed and exclusion limits at the 95% confidence level are extracted. Gluinos with masses up to 1800 GeV are excluded when decaying directly to three jets. In the cascade scenario, gluinos with masses up to 2340 GeV are excluded for a neutralino with mass up to 1250 GeV.


Figure 3. Scatter plot of models selected from (a) the EWKino and (b) the BinoDM scan (before the relic density constraint is applied) in the Ωh 2 versus m( ˜ χ 0 1 ) plane, coloured by the dominant annihilation mechanism. No additional external constraints are applied.
Figure 12. Scatter plots of models from the BinoDM scan in the m( ˜ χ 0 1 )-Ωh 2 plane, coloured by the dominant annihilation mechanism for the corresponding model. The plot is shown for all considered models, after ATLAS Run 2 constraints, after external constraints, and after both ATLAS Run 2 and external constraints.
ATLAS Run 2 searches for electroweak production of supersymmetric particles interpreted within the pMSSM

May 2024

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42 Reads

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8 Citations

Journal of High Energy Physics

A bstract A summary of the constraints from searches performed by the ATLAS collaboration for the electroweak production of charginos and neutralinos is presented. Results from eight separate ATLAS searches are considered, each using 140 fb − 1 of proton-proton data at a centre-of-mass energy of s \sqrt{s} s = 13 TeV collected at the Large Hadron Collider during its second data-taking run. The results are interpreted in the context of the 19-parameter phenomenological minimal supersymmetric standard model, where R -parity conservation is assumed and the lightest supersymmetric particle is assumed to be the lightest neutralino. Constraints from previous electroweak, flavour and dark matter related measurements are also considered. The results are presented in terms of constraints on supersymmetric particle masses and are compared with limits from simplified models. Also shown is the impact of ATLAS searches on parameters such as the dark matter relic density and the spin-dependent and spin-independent scattering cross-sections targeted by direct dark matter detection experiments. The Higgs boson and Z boson ‘funnel regions’, where a low-mass neutralino would not oversaturate the dark matter relic abundance, are almost completely excluded by the considered constraints. Example spectra for non-excluded supersymmetric models with light charginos and neutralinos are also presented.


Test of CP-invariance of the Higgs boson in vector-boson fusion production and in its decay into four leptons

May 2024

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40 Reads

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17 Citations

Journal of High Energy Physics

A bstract A search for CP violation in the decay kinematics and vector-boson fusion production of the Higgs boson is performed in the H → ZZ * → 4 ℓ ( ℓ = e, μ ) decay channel. The results are based on proton-proton collision data produced at the LHC at a centre-of-mass energy of 13 TeV and recorded by the ATLAS detector from 2015 to 2018, corresponding to an integrated luminosity of 139 fb − 1 . Matrix element-based optimal observables are used to constrain CP-odd couplings beyond the Standard Model in the framework of Standard Model effective field theory expressed in the Warsaw and Higgs bases. Differential fiducial cross-section measurements of the optimal observables are also performed, and a new fiducial cross-section measurement for vector-boson-fusion production is provided. All measurements are in agreement with the Standard Model prediction of a CP-even Higgs boson.


Figure 7. Comparison of the observed and expected event yields in all VRs and SRs after the background-only fit for the signal regions targeting chargino/neutralino production and decay via intermediate staus. Representative SUSY scenarios are overlaid for illustration. The hatched band represents the combined statistical and systematic uncertainties of the total SM background. The lower panel shows the significance of any difference between the data and total SM background estimate yields.
Figure 8. The distributions of (a) the highest-p T τ -lepton transverse momentum p τ T and (b) m T2 variables in FFVR-Wh after the background-only fit. The misidentified contribution with at least two misidentified τ -leptons (Mis-ID τ ) is estimated from data using the fake factor method. Representative SUSY scenarios are overlaid for illustration. The hatched bands represent the combined statistical and systematic uncertainties of the total SM background. The lower panels show the ratio of data to the total SM background estimate.
Search for electroweak production of supersymmetric particles in final states with two τ-leptons in s \sqrt{s} = 13 TeV pp collisions with the ATLAS detector

May 2024

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31 Reads

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9 Citations

Journal of High Energy Physics

A bstract Three searches for the direct production of τ -sleptons or charginos and neutralinos in final states with at least two hadronically decaying τ -leptons are presented. For chargino and neutralino production, decays via intermediate τ -sleptons or W and h bosons are considered. The analysis uses a dataset of pp collisions corresponding to an integrated luminosity of 139 fb − 1 , recorded with the ATLAS detector at the Large Hadron Collider at a centre-of-mass energy of 13 TeV. No significant deviation from the expected Standard Model background is observed and supersymmetric particle mass limits at 95% confidence level are obtained in simplified models. For direct production of χ1+χ1 {\overset{\sim }{\chi}}_1^{+}{\overset{\sim }{\chi}}_1^{-} χ ~ 1 + χ ~ 1 − , chargino masses are excluded up to 970 GeV, while χ1± {\overset{\sim }{\chi}}_1^{\pm } χ ~ 1 ± and χ20 {\overset{\sim }{\chi}}_2^0 χ ~ 2 0 masses up to 1160 GeV (330 GeV) are excluded for χ1±χ20/χ1+χ1 {\overset{\sim }{\chi}}_1^{\pm }{\overset{\sim }{\chi}}_2^0/{\overset{\sim }{\chi}}_1^{+}{\overset{\sim }{\chi}}_1^{-} χ ~ 1 ± χ ~ 2 0 / χ ~ 1 + χ ~ 1 − production with subsequent decays via τ -sleptons ( W and h bosons). Masses of τ -sleptons up to 500 GeV are excluded for mass degenerate τL,R {\overset{\sim }{\tau}}_{L,R} τ ~ L , R scenarios and up to 425 GeV for τL {\overset{\sim }{\tau}}_L τ ~ L -only scenarios. Sensitivity to τR {\overset{\sim }{\tau}}_R τ ~ R -only scenarios from the ATLAS experiment is presented here for the first time, with τR {\overset{\sim }{\tau}}_R τ ~ R masses excluded up to 350 GeV.


Citations (93)


... Machine learning (ML) provides a set of tools that can analyze hadronic final states holistically to achieve the best precision. Recent examples supporting this claim include the energy calibrations of single hadrons [1][2][3][4][5][6][7][8][9][10][11], jets [12][13][14][15][16][17][18][19][20][21], and global event properties [22][23][24][25] at colliders. These techniques can automatically make use of finer segmentation to improve the resolution of reconstructed particle energies [4,10]. ...

Reference:

Unifying simulation and inference with normalizing flows
Simultaneous energy and mass calibration of large-radius jets with the ATLAS detector using a deep neural network

... Moreover, the direct production of h 2 decaying via h 2 → tt contributes to tt and tttt final states. The investigated benchmark plane is compatible with the first-year Run 2 results from CMS tt searches [81], but the CP-conserving limit α 3 ≈ π/2 would be in tension with the full Run 2 ATLAS [134] and CMS results [135]. However, these updated limits are not included here since they can only be applied under the assumption of CP conservation where h 2 and h 3 do not interfere. ...

Search for heavy neutral Higgs bosons decaying into a top quark pair in 140 fb−1 of proton-proton collision data at s \sqrt{s} = 13 TeV with the ATLAS detector

Journal of High Energy Physics

... Although this proposal received some criti-cism [50][51][52], a finite-distance deflection angle formulation based on the GW method was later introduced by Ishihara et al. [23], which has since gained widespread acceptance; the infinite-distance deflection angle can then be recovered as a limiting case. More recently, Li et al. employed the Jacobi-Maupertuis-Randers-Finsler metric in conjunction with the GB theorem to explore finite distance effects on the deflection of heavy particles in time-independent, axially symmetric spacetimes [53][54][55]. Additionally, Arakida examined the deflection angle in the finite region by considering a vacuum solution [56], and Takizawa et al. investigated light deflection in asymptotically curved spacetimes using non-inertial circular orbits [57]. ...

Search for flavour-changing neutral-current couplings between the top quark and the Higgs boson in multi-lepton final states in 13 TeV pp collisions with the ATLAS detector

The European Physical Journal C

... Mono-W , mono-Z, W γ, Zγ, W W and W W γ plus missing energy signals have been studied at the LHC to probe the ALP mass and couplings to electroweak gauge bosons [23,24,52,53,54,55,56,57,58]. Other experimental searches for ALPs have been performed by ATLAS and CMS, including in anomalous Higgs decays to photon pairs [59], light-by-light scattering in heavy-ion collisions [60], and nonresonant diboson production such as ZZ and ZH final states [61]. These studies place direct constraints on ALP couplings to photons, gluons, and electroweak gauge bosons across a broad mass range. ...

Search for short- and long-lived axion-like particles in Haa4γH\rightarrow a a \rightarrow 4\gamma decays with the ATLAS experiment at the LHC

The European Physical Journal C

... Also, an opposite corner of kinematic parameter space with lighter LLPs started to gain more interest recently. Models with LLP masses as small as 400 MeV have been constrained at the LHC in Higgs boson decays [19,25] and a recent search for displaced muon pairs probes heavy squark decays to long-lived neutralinos, where the mass splitting between those two is only 25 GeV [26]. However, in this regime experiments at the LHC suffer from a huge background, which can affect searches for both light and heavier states, in particular in the case of models with compressed spectra (small mass differences between particles in the decay chain). ...

Search for light long-lived neutral particles from Higgs boson decays via vector-boson-fusion production from pp collisions at s=13\sqrt{s}=13 TeV with the ATLAS detector

The European Physical Journal C

... Electrons and muons are used to preferentially select events with prompt leptons. Electron candidates are built from spatially compatible isolated electromagnetic energy clusters and ID tracks [97]; they are required to have T > 28 GeV and | | < 2.47 after their energies are corrected using calorimeter shower shape information. Candidates in the calorimeter barrel-endcap transition region (1.37 < | | < 1.52) are removed to avoid large uncertainties in the identification efficiency. ...

Electron and photon efficiencies in LHC Run 2 with the ATLAS experiment

Journal of High Energy Physics

... In the framework we adopt, SCS collider phenomenology depends on the SCS mass and its branching ratios to the individual lepton flavors, B e,µ,τ , which we assume sum to one. LHC slepton searches [7][8][9][10][11][12] place constraints on an SCS with B e = 1, B µ = 1, or B τ = 1. In these cases, the SCS signals are identical to righthanded selectrons, smuons, or staus, respectively, which decay directly to an effectively massless neutralino (and with all other superpartners decoupled). ...

Search for electroweak production of supersymmetric particles in final states with two τ-leptons in s \sqrt{s} = 13 TeV pp collisions with the ATLAS detector

Journal of High Energy Physics

... In indirect detection (ID) experiments as well, the exclusion limit from Fermi-LAT [20] has reached the thermal cross-section limit for DM, which accounts for DM correct relic density. At colliders, there have been extensive DM searches, particularly in the context of supersymmetry, which has explored a large parameter space without any positive signal for a DM candidate [21][22][23]. Moreover, precise measurements of Higgs observables have constrained the Higgs branching ratios to invisible degrees of freedom to a narrow range and the recent data indicates Br(h 1 → inv) ≤ 0.16 [24][25][26]. ...

ATLAS Run 2 searches for electroweak production of supersymmetric particles interpreted within the pMSSM

Journal of High Energy Physics

... The presence of momentum-dependent couplings is typical of higher-dimensional operators, and high-energy particle colliders are suitable experiments to probe such momentum-dependent couplings. The collider phenomenology of couplings of Higgs boson with vector bosons given in Eq. 1, has been performed at LHC in ATLAS [14,15] and CMS [16][17][18][19][20][21] An electron-proton (e − p) collider has advantage over both e − e + and pp colliders. It provides an opportunity to study high-energy interactions with relatively low backgrounds. ...

Test of CP-invariance of the Higgs boson in vector-boson fusion production and in its decay into four leptons

Journal of High Energy Physics

... We see that the FCC-ee will likely not be competitive with the LHC, even when assuming a compressed spectrum and negligible systematic uncertainties for the FCC-ee. Moreover, the limits on RPV decays of the gluino (m˜g ≳ 1800 GeV [53]) are already strong enough to comfortably exclude the viable parameter space for the FCC-ee, if one assumes the current estimates for the systematic uncertainty on R l . ...

A search for R-parity-violating supersymmetry in final states containing many jets in pp collisions at s \sqrt{s} = 13 TeV with the ATLAS detector

Journal of High Energy Physics