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Title: Nonzero trilinear parameter in the minimal supergravity model: Dark matter and collider signals at the Fermilab Tevatron and CERN LHC

Abstract

Phenomenologically viable and interesting regions of parameter space in the minimal supergravity (mSUGRA) model with small m{sub 0} and small m{sub 1/2} consistent with the WMAP data on dark matter relic density and the bound on the mass of the lightest Higgs scalar m{sub h}>114 GeV from the Linear Electron Positron Collider open up if the rather ad hoc assumption A{sub 0}=0, where A{sub 0} is the common trilinear soft breaking parameter, employed in most of the existing analyses is relaxed. Since this region corresponds to relatively light squarks and gluinos which are likely to be probed extensively in the very early stages of the LHC experiments, the consequences of moderate or large negative values of A{sub 0} are examined in detail. We find that in this region several processes including lightest supersymmetric particle (LSP) pair annihilation, LSP-lighter tau slepton ({tau}-tilde{sub 1}) coannihilation and LSP--lighter top squark (t-tilde{sub 1}) coannihilation contribute to the observed dark matter relic density. The possibility that a t-tilde{sub 1} that can participate in coannihilation with the lightest neutralino to satisfy the WMAP bound on relic density and at the same time be observed at the current experiments at the Tevatron is wide open. At themore » LHC a large number of squark-gluino events lead to a very distinctive semi-inclusive signature {tau}{sup {+-}}+X{sub {tau}} (anything without a tau lepton) with a characteristic size much larger than e{sup {+-}}+X{sub e} or {mu}{sup {+-}}+X{sub {mu}} events.« less

Authors:
;  [1]; ;  [2]
  1. Department of Theoretical Physics, Indian Association for the Cultivation of Science, Raja S.C. Mullick Road, Kolkata 700 032 (India)
  2. Department of Physics, Jadavpur University, Jadavpur, Kolkata 700 032 (India)
Publication Date:
OSTI Identifier:
21027711
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 76; Journal Issue: 5; Other Information: DOI: 10.1103/PhysRevD.76.055008; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ANNIHILATION; CERN LHC; ELECTRONS; FERMILAB TEVATRON; GEV RANGE; HIGGS BOSONS; HIGGS MODEL; MUONS MINUS; MUONS PLUS; NONLUMINOUS MATTER; PARTICLE IDENTIFICATION; POSITRONS; REST MASS; SEMI-INCLUSIVE INTERACTIONS; SPARTICLES; SUPERGRAVITY; TAU PARTICLES

Citation Formats

Chattopadhyay, Utpal, Das, Debottam, Datta, Amitava, and Poddar, Sujoy. Nonzero trilinear parameter in the minimal supergravity model: Dark matter and collider signals at the Fermilab Tevatron and CERN LHC. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.76.055008.
Chattopadhyay, Utpal, Das, Debottam, Datta, Amitava, & Poddar, Sujoy. Nonzero trilinear parameter in the minimal supergravity model: Dark matter and collider signals at the Fermilab Tevatron and CERN LHC. United States. doi:10.1103/PHYSREVD.76.055008.
Chattopadhyay, Utpal, Das, Debottam, Datta, Amitava, and Poddar, Sujoy. Sat . "Nonzero trilinear parameter in the minimal supergravity model: Dark matter and collider signals at the Fermilab Tevatron and CERN LHC". United States. doi:10.1103/PHYSREVD.76.055008.
@article{osti_21027711,
title = {Nonzero trilinear parameter in the minimal supergravity model: Dark matter and collider signals at the Fermilab Tevatron and CERN LHC},
author = {Chattopadhyay, Utpal and Das, Debottam and Datta, Amitava and Poddar, Sujoy},
abstractNote = {Phenomenologically viable and interesting regions of parameter space in the minimal supergravity (mSUGRA) model with small m{sub 0} and small m{sub 1/2} consistent with the WMAP data on dark matter relic density and the bound on the mass of the lightest Higgs scalar m{sub h}>114 GeV from the Linear Electron Positron Collider open up if the rather ad hoc assumption A{sub 0}=0, where A{sub 0} is the common trilinear soft breaking parameter, employed in most of the existing analyses is relaxed. Since this region corresponds to relatively light squarks and gluinos which are likely to be probed extensively in the very early stages of the LHC experiments, the consequences of moderate or large negative values of A{sub 0} are examined in detail. We find that in this region several processes including lightest supersymmetric particle (LSP) pair annihilation, LSP-lighter tau slepton ({tau}-tilde{sub 1}) coannihilation and LSP--lighter top squark (t-tilde{sub 1}) coannihilation contribute to the observed dark matter relic density. The possibility that a t-tilde{sub 1} that can participate in coannihilation with the lightest neutralino to satisfy the WMAP bound on relic density and at the same time be observed at the current experiments at the Tevatron is wide open. At the LHC a large number of squark-gluino events lead to a very distinctive semi-inclusive signature {tau}{sup {+-}}+X{sub {tau}} (anything without a tau lepton) with a characteristic size much larger than e{sup {+-}}+X{sub e} or {mu}{sup {+-}}+X{sub {mu}} events.},
doi = {10.1103/PHYSREVD.76.055008},
journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 5,
volume = 76,
place = {United States},
year = {2007},
month = {9}
}