5,177 research outputs found
Search for SM and MSSM Higgs Bosons at LEP
Latest results from the LEP Collaboration on searches for neutral Higgs
bosons predicted by the Standard Model and its minimal supersymmetric
extension, the MSSM, are summarized.Comment: Talk presented at SUSY 2003: Supersymmetry in the Desert, University
of Arizona, Tucson, AZ, June 5-10, 200
The CMS Silicon Strip Tracker
The CMS collaboration is constructing the largest silicon tracker ever built
with an active silicon area of 200 m^2 to provide robust charged particle
tracking and vertex reconstruction within the 4T magnetic field of the CMS
Solenoid. The design of the detector, the status of the construction and the
performance of the substructures are reviewed.Comment: Presented at PANIC05, Particles and Nuclei International Conference,
Santa Fe, New Mexico, USA, 24-28 October, 200
Study of ZZ production at LEP at sqrt(s) = 183 - 209 GeV
A study of Z boson pair production in e+e- annihilation using the OPAL
detector at LEP is reported. The ZZ production cross-section is measured,
limits on anomalous ZZgamma and ZZZ couplings are derived, and constraints on
models of low scale quantum gravity in extra spatial dimensions are set.Comment: 4 pages, 4 figures. To be published in the Proceedings of DPF2000,
The Meeting of The Division of Particles and Fields of The American Physical
Society, Columbus, Ohio, 9-12 August 2000, (Supplement of the International
Journal of Modern Physics A (IJMP)
Search for supersymmetry, extra dimensions and exotic phenomena at LEP
The latest results on searches for supersymmetry, extra dimensions and exotic
phenomena from the LEP collaborations are presented. No significant signal-like
excess is observed in the data. The results are interpreted in various models
and robust constraints are placed.Comment: Contributed to 16th Les Rencontres de Physique de la Vallee d'Aoste:
Results and Perspectives in Particle Physics, La Thuile, Aosta Valley, Italy,
3-9 Mar 200
Search for Gauginos and Gauge Mediated SUSY Breaking Scenarios at LEP
Data collected by the OPAL detector at LEP up to the highest energies of 209
GeV are analyzed to search for evidence of supersymmetric (SUSY) particle
production. Chargino pair-production and neutralino associated production are
considered in models where supersymmetry breaking is mediated by gravitational
interactions. The focus of the searches is on topologies arising when scalar
fermions are heavy and the lightest neutralino is the lightest SUSY particle
(LSP). Searches for topologies predicted by gauge-mediated SUSY breaking (GMSB)
models are also discussed. In these models the LSP is the gravitino and the
phenomenology is driven by the nature of the next-to-lightest SUSY particle
(NLSP) which is either the lightest neutralino, stau or mass degenerate
sleptons. As the NLSP decay length is effectively unconstrained, all possible
values are considered and results independent of the NLSP lifetime are
presented for all relevant final states including direct NLSP pair-production
and NLSP production via cascade decays of heavier SUSY particles. None of the
searches shows evidence for SUSY particle production. Cross-section limits are
presented at the 95% confidence level both for direct NLSP production and, for
the first time, also for cascade decays. These are then interpreted in the
framework of minimal theoretical models. Large areas of the accessible
parameter space are excluded and constraints on the mass of the SUSY particles
are derived.Comment: Presented at HEP2005 International Europhysics Conference on High
Energy Physics, July 21st - 27th 2005, Lisboa, Portugal (4 pages, 6 figures
Exploring New Physics Through Contact Interactions in Lepton Pair Production at a Linear Collider
If a contact interaction type correction to a Standard Model process is
observed, studying its detailed properties can provide information on the
fundamental physics responsible for it. Assuming that such a correction has
been observed in lepton pair production at a 500 GeV - 1 TeV linear collider,
we consider a few possible models that could explain it, such as theories with
large and TeV-scale extra dimensions and models with lepton compositeness. We
show that using the measured cross-sections and angular distributions, these
models can be distinguished with a high degree of confidence.Comment: Contributed to APS / DPF / DPB Summer Study on the Future of Particle
Physics (Snowmass 2001), Snowmass, Colorado, 30 Jun - 21 Jul 200
Report of the Snowmass Subgroup on Extra Dimensions
In this report we summarize the work performed at Snowmass 2001 on the
physics of extra dimensions. We divide these analyses into the following
classes: searches for extra dimensional phenomena, identification of specific
new physics scenarios, studies of black hole production and non-commutative
QED.Comment: Contributed to APS / DPF / DPB Summer Study on the Future of Particle
Physics (Snowmass 2001), Snowmass, Colorado, 30 Jun - 21 Jul 200
The LEP Testimony: Exotic Searches and Studies
A selection of recent results on searches for phenomena beyond the Standard Model is presented from the LEP Collaborations, based on the data collected up to the highest centre-of-mass energies of 209 GeV.A selection of recent results on searches for phenomena beyond the Standard Model is presented from the LEP Collaborations, based on the data collected up to the highest centre-of-mass energies of 209 GeV
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