Publications (10)0 Total impact
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S. Kraml,
B. C. Allanach,
M. Mangano,
H. B. Prosper,
S. Sekmen,
C. Balazs,
A. Barr,
P. Bechtle,
G. Belanger,
A. Belyaev, [......],
A. Ismail,
M. Kadastik,
M. Kramer,
J. Lykken,
F. Mahmoudi,
S. P. Martin,
T. Rizzo,
T. Robens,
M. Tytgat,
A. Weiler
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ABSTRACT: We present a set of recommendations for the presentation of LHC results on
searches for new physics, which are aimed at providing a more efficient flow of
scientific information between the experimental collaborations and the rest of
the high energy physics community, and at facilitating the interpretation of
the results in a wide class of models. Implementing these recommendations would
aid the full exploitation of the physics potential of the LHC.
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
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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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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
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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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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
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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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ABSTRACT: We present an exploratory study of gaugino-pair production in polarized and unpolarized hadron collisions, focusing on the correlation of beam polarization and gaugino/Higgsino mixing in the general Minimal Supersymmetric Standard Model. Helicity-dependent cross sections induced by neutral and charged electroweak currents and squark exchanges are computed analytically in terms of generalized charges, defined similarly for chargino-pair, neutralino-chargino associated, and neutralino-pair production. Our results confirm and extend those obtained previously for negligible Yukawa couplings and nonmixing squarks. Assuming that the lightest chargino mass is known, we show numerically that measurements of the longitudinal single-spin asymmetry at the existing polarized pp collider RHIC and at possible polarization upgrades of the Tevatron or the LHC would allow for a determination of the gaugino/Higgsino fractions of charginos and neutralinos. The theoretical uncertainty coming from factorization scale and squark mass variations and the expected experimental error on the lightest chargino mass is generally smaller than the one induced by the polarized parton densities, so that more information on the latter would considerably improve on the analysis.
05/2008;
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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
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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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ABSTRACT: We perform a first precision calculation of the transverse-momentum (q_T) distribution of slepton pair and slepton-sneutrino associated production at the CERN Large Hadron Collider (LHC). We implement soft-gluon resummation at the next-to-leading logarithmic (NLL) level and consistently match the obtained result to the pure fixed-order perturbative result at leading order (LO) in the QCD coupling constant, i.e. O(alpha_s). We give numerical predictions for stau_1 stau_1^* and stau_1 sneutrino_tau^* + stau_1^* sneutrino_tau production, also implementing recent parameterizations of non-perturbative effects. The results show a relevant contribution of resummation both in the small and intermediate q_T-regions and little dependence on unphysical scales and non-perturbative contributions.
04/2006;
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ABSTRACT: We calculate squared helicity amplitudes for non-diagonal and mixed squark
pair production at hadron colliders, taking into account not only loop-induced
QCD diagrams, but also previously unconsidered electroweak channels, which turn
out to be dominant. Mixing effects are included for both top and bottom
squarks. Numerical results are presented for several SUSY benchmark scenarios
at both the CERN LHC and the Fermilab Tevatron, including the possibilities of
light stops or sbottoms. The latter should be easily observed at the Tevatron
in associated production of stops and sbottoms for a large range of stop masses
and almost independently of the stop mixing angle. Asymmetry measurements for
light stops at the polarized BNL RHIC collider are also briefly discussed.
07/2005;
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ABSTRACT: We calculate cross sections and asymmetries for slepton pair production through neutral and charged electroweak currents in polarized hadron collisions for general slepton masses and including mixing of the left- and right-handed interaction eigenstates relevant for third generation sleptons. Our analytical results confirm and extend a previous calculation. Numerically, we show that measurements of the longitudinal single-spin asymmetry at the existing polarized pp collider RHIC and at possible polarization upgrades of the Tevatron or the LHC would allow for a determination of the tau slepton mixing angle and/or the associated supersymmetry breaking parameters Λ for gauge mediation and A0 for minimal supergravity. Furthermore, the Standard Model background from tau pair production can be clearly distinguished due to the opposite sign of the associated asymmetry.
Physics Letters B.
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[show abstract]
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ABSTRACT: We perform a first precision calculation of the transverse-momentum (q_T) distribution of slepton pair and slepton-sneutrino associated production at the CERN Large Hadron Collider (LHC). We implement soft-gluon resummation at the next-to-leading logarithmic (NLL) level and consistently match the obtained result to the pure fixed-order perturbative result at leading order (LO) in the QCD coupling constant, i.e. O(alpha_s). We give numerical predictions for stau_1 stau_1^* and stau_1 sneutrino_tau^* + stau_1^* sneutrino_tau production, also implementing recent parameterizations of non-perturbative effects. The results show a relevant contribution of resummation both in the small and intermediate q_T-regions and little dependence on unphysical scales and non-perturbative contributions.
