Implications of WMAP data and other constraints for collider searches for SUSY
Abstract
The WMAP data provide a stringent upper bound on the mass of any thermal, stable weakly interacting massive particle, such as the stable lightest neutralino of Rparity conserving SUSY models. We first examine how the WMAP data together with measurements of g{mu}  2, radiative Bmeson decays constrain the parameter space of the paradigm mSUGRA model, and explore their ramifications for expectations at future colliders as well as for direct and indirect detection of SUSY WIMPS. Finally, we examine whether these conclusions are qualitatively stable to departures from universality that are the hallmark of the mSUGRA framework. We find that seemingly innocuous modifications of mSUGRA can result in qualitatively different expectations at colliders, and so caution that it may be dangerous to draw strong inferences based solely on mSUGRA considerations.
 Authors:
 Department of Physics and Astronomy, University of Hawaii, Honolulu, HI 96822 (United States)
 Publication Date:
 OSTI Identifier:
 20729220
 Resource Type:
 Journal Article
 Resource Relation:
 Journal Name: AIP Conference Proceedings; Journal Volume: 805; Journal Issue: 1; Conference: PASCOS 2005: 11. international symposium on particles, strings, and cosmology, Gyeongju (Korea, Republic of), 30 May  4 Jun 2005; Other Information: DOI: 10.1063/1.2149678; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; B MESONS; PARITY; PARTICLE DECAY; PARTICLE IDENTIFICATION; QUANTUM FIELD THEORY; REST MASS; SPACE; SPARTICLES; SUPERGRAVITY; SUPERSYMMETRY
Citation Formats
Tata, Xerxes. Implications of WMAP data and other constraints for collider searches for SUSY. United States: N. p., 2005.
Web. doi:10.1063/1.2149678.
Tata, Xerxes. Implications of WMAP data and other constraints for collider searches for SUSY. United States. doi:10.1063/1.2149678.
Tata, Xerxes. Fri .
"Implications of WMAP data and other constraints for collider searches for SUSY". United States.
doi:10.1063/1.2149678.
@article{osti_20729220,
title = {Implications of WMAP data and other constraints for collider searches for SUSY},
author = {Tata, Xerxes},
abstractNote = {The WMAP data provide a stringent upper bound on the mass of any thermal, stable weakly interacting massive particle, such as the stable lightest neutralino of Rparity conserving SUSY models. We first examine how the WMAP data together with measurements of g{mu}  2, radiative Bmeson decays constrain the parameter space of the paradigm mSUGRA model, and explore their ramifications for expectations at future colliders as well as for direct and indirect detection of SUSY WIMPS. Finally, we examine whether these conclusions are qualitatively stable to departures from universality that are the hallmark of the mSUGRA framework. We find that seemingly innocuous modifications of mSUGRA can result in qualitatively different expectations at colliders, and so caution that it may be dangerous to draw strong inferences based solely on mSUGRA considerations.},
doi = {10.1063/1.2149678},
journal = {AIP Conference Proceedings},
number = 1,
volume = 805,
place = {United States},
year = {Fri Dec 02 00:00:00 EST 2005},
month = {Fri Dec 02 00:00:00 EST 2005}
}

The PAMELA positron excess is analyzed within the framework of nonuniversal supergravity (SUGRA) models with an extended U(1){sup n} gauge symmetry in the hidden sector leading to neutralino dark matter with either a mixed Higgsinowino lightest Rparity odd supersymmetric particle (LSP) or an essentially pure winodominated LSP. The Higgsinowino LSP can produce the observed PAMELA positron excess and satisfy relic density constraints in the extended class of models due to a near degeneracy of the mass spectrum of the extended neutralino sector with the LSP mass. The simultaneous satisfaction of the WMAP relic density data and the PAMELA data ismore »

Prospects for SUSY searches and measurements at a muon collider
We summarize the discussions and main results presented at the SUSY Searches and Measurements Working Group of the Workshop on Physics at the First Muon Collider and at the Front End of a Muon Collider. {copyright} {ital 1998 American Institute of Physics.} 
Revised WMAP constraints on neutrino masses and other extensions of the minimal {lambda}CDM model
Recently, two issues concerning the threeyear Wilkinson Microwave Anisotropy Probe (WMAP) likelihood code were pointed out. On large angular scales (l(lessorsimilar sign)30), a suboptimal likelihood approximation resulted in a small power excess. On small angular scales (l(greaterorsimilar sign)300), oversubtraction of unresolved point sources produced a small power deficit. For a minimal sixparameter cosmological model, these two effects conspired to decrease the value of n{sub s} by {approx}0.7{sigma}. In this paper, we study the change in preferred parameter ranges for extended cosmological models, including running of n{sub s}, massive neutrinos, curvature, and the equation of state for dark energy. We alsomore » 
WMAP fiveyear constraints on lepton asymmetry and radiation energy density: implications for Planck
In this paper we set bounds on the radiation content of the Universe and neutrino properties by using the WMAP (Wilkinson microwave anisotropy probe) fiveyear CMB (cosmic microwave background) measurements complemented with most of the existing CMB and LSS (large scale structure) data (WMAP5+All), imposing also selfconsistent BBN (big bang nucleosynthesis) constraints on the primordial helium abundance. We consider lepton asymmetric cosmological models parametrized by the neutrino degeneracy parameter {xi}{sub {nu}} and the variation of the relativistic degrees of freedom, {Delta}N{sub eff}{sup oth}, due to possible other physical processes occurring between BBN and structure formation epochs. We get a meanmore » 
Datadriven estimations of Standard Model backgrounds to SUSY searches in ATLAS
At the Large Hadron Collider (LHC), the strategy for the observation of supersymmetry in the early days is mainly based on inclusive searches. Major backgrounds are constituted by mismeasured multijet events and W, Z and t quark production in association with jets. We describe recent work performed in the ATLAS Collaboration to derive these backgrounds from the first ATLAS data.