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J. Alcaraz Maestre,
S. Alioli,
J. R. Andersen,
R. D. Ball,
A. Buckley,
M. Cacciari,
F. Campanario,
N. Chanon,
G. Chachamis,
V. Ciulli, [......],
P. Torrielli,
F. Tramontano,
M. Tripiana,
Z. Trócsányi,
M. Ubiali,
V. Yundin,
S. Weinzierl,
J. Winter,
J. Y. Yu,
K. Zapp
[show abstract]
[hide abstract]
ABSTRACT: The 2011 Les Houches workshop was the first to confront LHC data. In the two
years since the previous workshop there have been significant advances in both
soft and hard QCD, particularly in the areas of multi-leg NLO calculations, the
inclusion of those NLO calculations into parton shower Monte Carlos, and the
tuning of the non-perturbative parameters of those Monte Carlos. These
proceedings describe the theoretical advances that have taken place, the impact
of the early LHC data, and the areas for future development.
03/2012;
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G. Brooijmans,
B. Gripaios,
F. Moortgat,
J. Santiago, P. Skands,
D. Albornoz Vásquez,
B. C. Allanach,
A. Alloul,
A. Arbey,
A. Azatov, [......],
D. G. E. Walker,
A. Weiler,
S. M. West,
C. D. White,
A. J. Williams,
A. Wingerter,
C. Wymant,
J. -H. Yu,
C. -P. Yuan,
D. Zerwas
[show abstract]
[hide abstract]
ABSTRACT: We present the activities of the "New Physics" working group for the "Physics
at TeV Colliders" workshop (Les Houches, France, 30 May-17 June, 2011). Our
report includes new agreements on formats for interfaces between computational
tools, new tool developments, important signatures for searches at the LHC,
recommendations for presentation of LHC search results, as well as additional
phenomenological studies.
03/2012;
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[show abstract]
[hide abstract]
ABSTRACT: We present a complete formalism for final-state (timelike) dipole-antenna showers including fermion masses, but neglecting polarization and finite-width effects. We make several comparisons of tree-level expansions of this shower algorithm to fixed-order matrix elements for hadronic Z decays, up to and including Z→6 partons, to which the algorithm can be consistently matched over all of phase space. We also compare to analytical resummations at the next-to-leading logarithmic (NLL) level. The shower algorithm has been implemented in the publicly available VINCIA plug-in to the PYTHIA 8 event generator, which enables us to compare to experimental data at the fully hadronized level. We therefore also include comparisons to selected observables in b-tagged Z decays.
Phys. Rev. D. 01/2012; 85(1).
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F. Mahmoudi,
S. Heinemeyer,
A. Arbey,
A. Bharucha,
T. Goto,
T. Hahn,
U. Haisch,
S. Kraml,
M. Muhlleitner,
J. Reuter, P. Skands,
P. Slavich
[show abstract]
[hide abstract]
ABSTRACT: We present the Flavour Les Houches Accord (FLHA) which specifies a unique set
of conventions for flavour-related parameters and observables. The FLHA uses
the generic SUSY Les Houches Accord (SLHA) file structure. It defines the
relevant Standard Model masses, Wilson coefficients, decay constants, bag
parameters, flavour observables, etc. The accord provides a universal and
model-independent interface between codes evaluating and/or using
flavour-related observables.
08/2010;
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R Bernhard,
R Field,
R Chierici,
M Cacciari,
A. Moraes,
M. Strikman,
D. Treleani,
T. C. Rogers,
A. M. Stasto,
A. Achilli, [......],
K. Werner,
T. Pierog,
S. Porteboeuf,
H Hoeth, P. Skands,
D. d'Enterria,
C. Marquet,
A. Mischke,
M. Estienne,
K Reygers
[show abstract]
[hide abstract]
ABSTRACT: The objective of this first workshop on Multiple Partonic Interactions (MPI) at the LHC is to raise the profile of MPI studies, summarizing the legacy from the older phenomenology at hadronic colliders and favouring further specific contacts between the theory and experimental communities. The MPI are experiencing a growing popularity and are currently widely invoked to account for observations that would not be explained otherwise: the activity of the Underlying Event, the cross sections for multiple heavy flavour production, the survival probability of large rapidity gaps in hard diffraction, etc. At the same time, the implementation of the MPI effects in the Monte Carlo models is quickly proceeding through an increasing level of sophistication and complexity that in perspective achieves deep general implications for the LHC physics. The ultimate ambition of this workshop is to promote the MPI as unification concept between seemingly heterogeneous research lines and to profit of the complete experimental picture in order to constrain their implementation in the models, evaluating the spin offs on the LHC physics program. Comment: MPI'08 international workshop has been held in October 27-31, 2008, Perugia, Italy - 349 pages
03/2010;
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J.M. Butterworth,
F. Maltoni,
F Moortgat,
P Richardson,
S. Schumann, P. Skands,
J. Alwall,
A. Arbey,
L Basso,
S. Belov, [......],
T. Sjostrand,
P. Slavich,
M. Spira,
C Taylor,
M. Vesterinen,
S De Visscher,
D. Wackeroth,
S. Weinzierl,
J Winter,
T R Wyatt
[show abstract]
[hide abstract]
ABSTRACT: This is the summary and introduction to the proceedings contributions for the Les Houches 2009 "Tools and Monte Carlo" working group. Comment: 144 Pages. Workshop site http://wwwlapp.in2p3.fr/conferences/LesHouches/Houches2009/ . Conveners were Butterworth, Maltoni, Moortgat, Richardson, Schumann and Skands
03/2010;
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T. Binoth,
G. Dissertori,
J. Huston,
R. Pittau,
J. R. Andersen,
J. Archibald,
S. Badger,
R. D. Ball,
G. Bevilacqua,
I. Bierenbaum, [......],
P. Uwer,
A. Vicini,
M. Warsinsky,
G. Watt,
J. Weng,
I. Wigmore,
S. Weinzierl,
J. Winter,
M. Worek,
G. Zanderighi
[show abstract]
[hide abstract]
ABSTRACT: This report summarizes the activities of the SM and NLO Multileg Working
Group of the Workshop "Physics at TeV Colliders", Les Houches, France 8-26
June, 2009.
03/2010;
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J. M. Butterworth,
F. Maltoni,
F. Moortgat,
P. Richardson,
S. Schumann, P. Skands,
J. Alwall,
A. Arbey,
L. Basso,
S. Belov, [......],
T. Sjostrand,
P. Slavich,
M. Spira,
C. Taylor,
M. Vesterinen,
S. de Visscher,
D. Wackeroth,
S. Weinzierl,
J. Winter,
T. R. Wyatt
[show abstract]
[hide abstract]
ABSTRACT: This is the summary and introduction to the proceedings contributions
for the Les Houches 2009 "Tools and Monte Carlo" working group.
02/2010;
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T. Binoth,
F. Boudjema,
G. Dissertori,
A. Lazopoulos,
A. Denner,
S. Dittmaier,
R. Frederix,
N. Greiner,
S. Höche,
W. Giele, [......],
J. Huston,
N. Kauer,
F. Maltoni,
C. Oleari,
G. Passarino,
R. Pittau,
S. Pozzorini,
T. Reiter,
S. Schumann,
G. Zanderighi
[show abstract]
[hide abstract]
ABSTRACT: Many highly developed Monte Carlo tools for the evaluation of cross sections based on tree matrix elements exist and are used by experimental collaborations in high energy physics. As the evaluation of one-loop matrix elements has recently been undergoing enormous progress, the combination of one-loop matrix elements with existing Monte Carlo tools is on the horizon. This would lead to phenomenological predictions at the next-to-leading order level. This note summarises the discussion of the next-to-leading order multi-leg (NLM) working group on this issue which has been taking place during the workshop on Physics at TeV Colliders at Les Houches, France, in June 2009. The result is a proposal for a standard interface between Monte Carlo tools and one-loop matrix element programs.Dedicated to the memory of, and in tribute to, Thomas Binoth, who led the effort to develop this proposal for Les Houches 2009. Thomas led the discussions, set up the subgroups, collected the contributions, and wrote and edited this paper. He made a promise that the paper would be on the arXiv the first week of January, and we are faithfully fulfilling his promise. In his honour, we would like to call this the Binoth Les Houches Accord.
Computer Physics Communications. 01/2010;
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G Brooijmans,
A. Delgado,
B. A. Dobrescu,
C. Grojean,
M Narain,
J. Alwall,
G Azuelos,
K. Black,
E. Boos,
T Bose, [......],
G. Servant,
A. Sherstnev,
E. H. Simmons,
R K Singh, P. Skands,
S. Su,
T. M. P. Tait,
M. Takeuchi,
M Vos,
D. G. E. Walker
[show abstract]
[hide abstract]
ABSTRACT: We present a collection of signatures for physics beyond the standard model that need to be explored at the LHC. The signatures are organized according to the experimental objects that appear in the final state, and in particular the number of high pT leptons. Our report, which includes brief experimental and theoretical reviews as well as original results, summarizes the activities of the "New Physics'' working group for the "Physics at TeV Colliders" workshop (Les Houches, France, 11-29 June, 2007).
03/2008;
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M. M. Nojiri,
T. Plehn,
G Polesello,
M. Alexander,
B. C. Allanach,
A.J. Barr,
K. Benakli,
F. Boudjema,
A. Freitas,
C. Gwenlan, [......], P. Skands,
P. Slavich,
A Sopczak,
M. Spannowsky,
D. R. Tovey,
E. Turlay,
C. F. Uhlemann,
A. M. Weber,
P Zalewski,
D Zerwas
[show abstract]
[hide abstract]
ABSTRACT: This collection of studies on new physics at the LHC constitutes the report of the supersymmetry working group at the Workshop `Physics at TeV Colliders', Les Houches, France, 2007. They cover the wide spectrum of phenomenology in the LHC era, from alternative models and signatures to the extraction of relevant observables, the study of the MSSM parameter space and finally to the interplay of LHC observations with additional data expected on a similar time scale. The special feature of this collection is that while not each of the studies is explicitely performed together by theoretical and experimental LHC physicists, all of them were inspired by and discussed in this particular environment.
03/2008;
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T. Lari,
L Pape,
W. Porod,
J. A. Aguilar-Saavedra,
F. del Aguila,
B. C. Allanach,
J. Alwall,
Yu Andreev,
D. Aristizabal Sierra,
A. Bartl, [......],
J Tseng,
G. Unel,
J. W. F. Valle,
F Veloso,
A Ventura,
G. Vermisoglou,
C. Verzegnassi,
A. Villanova del Moral,
G. Weiglein,
M Yilmaz
[show abstract]
[hide abstract]
ABSTRACT: This review presents flavour related issues in the production and decays of heavy states at LHC, both from the experimental side and from the theoretical side. We review top quark physics and discuss flavour aspects of several extensions of the Standard Model, such as supersymmetry, little Higgs model or models with extra dimensions. This includes discovery aspects as well as measurement of several properties of these heavy states. We also present public available computational tools related to this topic.
02/2008;
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[show abstract]
[hide abstract]
ABSTRACT: We propose to combine and slightly extend two existing "Les Houches Accords" to provide a simple generic interface between beyond-the-standard-model parton-level and event-level generators. All relevant information - particle content, quantum numbers of new states, masses, cross sections, parton-level events, etc - is collected in one single file, which adheres to the Les Houches Event File (LHEF) standard.
01/2008;
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B.C. Allanach,
C. Balázs,
G. Bélanger,
M. Bernhardt,
F. Boudjema,
D. Choudhury,
K. Desch,
U. Ellwanger,
P. Gambino,
R. Godbole, [......],
W. Porod,
A. Pukhov,
P. Richardson,
M. Schumacher,
L. Silvestrini, P. Skands,
P. Slavich,
M. Spira,
G. Weiglein,
P. Wienemann
[show abstract]
[hide abstract]
ABSTRACT: The Supersymmetry Les Houches Accord (SLHA) provides a universal set of conventions for conveying spectral and decay information for supersymmetry analysis problems in high energy physics. Here, we propose extensions of the conventions of the first SLHA to include various generalisations: the minimal supersymmetric standard model with violation of CP, R-parity, and flavour, as well as the simplest next-to-minimal model.
Computer Physics Communications. 12/2007;
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TeV4LHC QCD Working Group: M. Albrow,
M Begel,
D Bourilkov,
M Campanelli,
F Chlebana,
A de Roeck,
J. R. Dittmann,
S. D. Ellis,
B. Field,
R Field, [......],
J Proudfoot,
K Rabbertz,
C Royon,
T. Sjostrand, P. Skands,
J Smith,
W. K. Tung,
M. R. Whalley,
M Wobisch,
M Zielinski
[show abstract]
[hide abstract]
ABSTRACT: The experiments at Run 2 of the Tevatron have each accumulated over 1 inverse femtobarn of high-transverse momentum data. Such a dataset allows for the first precision (i.e. comparisons between theory and experiment at the few percent level) tests of QCD at a hadron collider. While the Large Hadron Collider has been designed as a discovery machine, basic QCD analyses will still need to be performed to understand the working environment. The Tevatron-for-LHC workshop was conceived as a communication link to pass on the expertise of the Tevatron and to test new analysis ideas coming from the LHC community. The TeV4LHC QCD Working Group focussed on important aspects of QCD at hadron colliders: jet definitions, extraction and use of Parton Distribution Functions, the underlying event, Monte Carlo tunes, and diffractive physics. This report summarizes some of the results achieved during this workshop.
11/2006;
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J. Alwall,
A Ballestrero,
P Bartalini,
S. Belov,
E. Boos,
A. Buckley,
J.M. Butterworth,
L Dudko,
S. Frixione,
L. Garren, [......],
P Richardson,
M. H. Seymour,
A. Sherstnev,
T. Sjöstrand, P. Skands,
S. R. Slabospitsky,
Z. Wcas,
B. R. Webber,
M. Worek,
D. Zeppenfeld
[show abstract]
[hide abstract]
ABSTRACT: A standard file format is proposed to store process and event information, primarily output from parton-level event generators for further use by general-purpose ones. The information content is identical with what was already defined by the Les Houches Accord five years ago, but then in terms of Fortran commonblocks. This information is embedded in a minimal XML-style structure, for clarity and to simplify parsing.
10/2006;
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V Buescher,
M. Carena,
B. Dobrescu,
S. Mrenna,
D. Rainwater,
M Schmitt,
S Abdullin,
D Acosta,
S Asai,
O Atramentov, [......],
A. Sherstnev, P. Skands,
Z. Sullivan,
T. Tait,
X. Tata,
I Torchiani,
B Trocme,
C Wagner,
G. Weiglein,
D Zerwas
[show abstract]
[hide abstract]
ABSTRACT: This is the "TeV4LHC" report of the "Physics Landscapes" Working Group, focused on facilitating the start-up of physics explorations at the LHC by using the experience gained at the Tevatron. We present experimental and theoretical results that can be employed to probe various scenarios for physics beyond the Standard Model.
09/2006;
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C Buttar,
S. Dittmaier,
V Drollinger,
S. Frixione,
A. Nikitenko,
S. Willenbrock S. Abdullin,
E. Accomando,
D Acosta,
A. Arbuzov,
R. D. Ball, [......],
R Tanaka,
Z Trocsanyi,
S Tsuno,
A. Vicini,
D. Wackeroth,
M. M. Weber,
C Weiser,
S. Willenbrock,
S L Wu,
M Zanetti
[show abstract]
[hide abstract]
ABSTRACT: This Report summarises the activities of the "SM and Higgs" working group for the Workshop "Physics at TeV Colliders", Les Houches, France, 2-20 May, 2005. On the one hand, we performed a variety of experimental and theoretical studies on standard candles (such as W, Z, and ttbar production), treating them either as proper signals of known physics, or as backgrounds to unknown physics; we also addressed issues relevant to those non-perturbative or semi-perturbative ingredients, such as Parton Density Functions and Underlying Events, whose understanding will be crucial for a proper simulation of the actual events taking place in the detectors. On the other hand, several channels for the production of the Higgs, or involving the Higgs, have been considered in some detail. The report is structured into four main parts. The first one deals with Standard Model physics, except the Higgs. A variety of arguments are treated here, from full simulation of processes constituting a background to Higgs production, to studies of uncertainties due to PDFs and to extrapolations of models for underlying events, from small-$x$ issues to electroweak corrections which may play a role in vector boson physics. The second part of the report treats Higgs physics from the point of view of the signal. In the third part, reviews are presented on the current status of multi-leg, next-to-leading order and of next-to-next-to-leading order QCD computations. Finally, the fourth part deals with the use of Monte Carlos for simulation of LHC physics. Comment: 234 pages, 173 figures. Web page of the workshop (with links to the talks): http://lappweb.in2p3.fr/conferences/LesHouches/Houches2005/
04/2006;
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J. A. Aguilar-Saavedra,
A. Ali,
B. C. Allanach,
R. Arnowitt,
H. A. Baer,
J. A. Bagger,
C. Balazs,
V. Barger,
M. Barnett,
A. Bartl, [......],
G. Weiglein,
P. Wienemann,
Z.-Z. Xing,
Y. Yamada,
J. M. Yang,
D. Zerwas,
P. M. Zerwas,
R.-Y. Zhang,
X. Zhang,
S.-H. Zhu
[show abstract]
[hide abstract]
ABSTRACT: High-precision analyses of supersymmetry parameters aim at reconstructing the fundamental supersymmetric theory and its breaking
mechanism. A well defined theoretical framework is needed when higher-order corrections are included. We propose such a scheme,
Supersymmetry Parameter Analysis SPA, based on a consistent set of conventions and input parameters. A repository for computer
programs is provided which connect parameters in different schemes and relate the Lagrangian parameters to physical observables
at LHC and high energy e + e- linear collider experiments, i.e., masses, mixings, decay widths and production cross sections for supersymmetric particles.
In addition, programs for calculating high-precision low energy observables, the density of cold dark matter (CDM) in the
universe as well as the cross sections for CDM search experiments are included. The SPA scheme still requires extended efforts
on both the theoretical and experimental side before data can be evaluated in the future at the level of the desired precision.
We take here an initial step of testing the SPA scheme by applying the techniques involved to a specific supersymmetry reference
point.
European Physical Journal C 03/2006; 46(1):43-60. · 3.63 Impact Factor
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B. C. Allanach,
C. Grojean, P. Skands,
E. Accomando,
G Azuelos,
H Baer,
C. Balazs,
G. Belanger,
K. Benakli,
F. Boudjema, [......],
K Sridhar,
L. Tompkins,
C Troncon,
S Tsuno,
K. Wagh,
C. E. M. Wagner,
G. Weiglein,
P. Wienemann,
D Zerwas,
V Zhukov
[show abstract]
[hide abstract]
ABSTRACT: The work contained herein constitutes a report of the "Beyond the Standard Model'' working group for the Workshop "Physics at TeV Colliders", Les Houches, France, 2-20 May, 2005. We present reviews of current topics as well as original research carried out for the workshop. Supersymmetric and non-supersymmetric models are studied, as well as computational tools designed in order to facilitate their phenomenology.
03/2006;
