Exploring neutralino dark matter resonance annihilation via bA,bH{yields}b{mu}{sup +}{mu}{sup -} at the LHC

Journal Article · Tue Nov 01 00:00:00 EDT 2011 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.84.095029· OSTI ID:21608070

Baer, Howard; Kao, Chung ^[1]; Belyaev, Alexander; Svantesson, Patrik ^[2]

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1. Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, Oklahoma 73019 (United States)
2. NExT Institute: School of Physics and Astronomy, Univ. of Southampton, UK Particle Physics Department, Rutherford Appleton Laboratory (United Kingdom)

One of the main channels which allows for a large rate of neutralino dark matter annihilation in the early Universe is via the pseudoscalar Higgs A-resonance. In this case, the measured dark matter abundance can be obtained in the minimal supergravity (mSUGRA) model when tan{beta}{approx}50 and 2m{sub Z}-tilde{sub 1}{approx}m{sub A}. We investigate the reaction pp{yields}b{phi}{yields}b{mu}{sup +}{mu}{sup -}+X (where {phi}=A or H) at the CERN LHC where requiring the tag of a single b-jet allows for amplification of the signal-to-background ratio. The rare but observable Higgs decay to muon pairs allows for a precise measurement of the Higgs boson mass and decay width. We evaluate signal and background using CalcHEP, with muon energy smearing according to the CMS detector. We find that the Higgs width ({Gamma}{sub A}) can typically be determined with the accuracy up to {approx}8% ({approx}17%) for m{sub A}{approx}400(600) GeV assuming 10{sup 3} fb{sup -1} of integrated luminosity. Therefore, the pp{yields}b{phi}{yields}b{mu}{sup +}{mu}{sup -}+X process provides a unique possibility for direct {Gamma}{sub A} measurement at the LHC. While the Higgs width is correlated with the parameter tan{beta} for a given value of m{sub A}, extracting tan{beta} is complicated by an overlap of the A and H peaks, radiative corrections to the b and {tau} Yukawa couplings, and the possibility that SUSY decay modes of the Higgs may be open. In the case where a dilepton mass edge from Z-tilde{sub 2}{yields}l{sup +}l{sup -}Z-tilde{sub 1} is visible, it should be possible to test the relation that 2m{sub Z}-tilde{sub 1}{approx}m{sub A}.

• OSTI ID: 21608070
• Journal Information: Physical Review. D, Particles Fields, Vol. 84, Issue 9; Other Information: DOI: 10.1103/PhysRevD.84.095029; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
CERN LHC
COUPLING
GEV RANGE 100-1000
HIGGS BOSONS
HIGGS MODEL
LUMINOSITY
MASS
MESONS
MUON PAIRS
MUONS
NONLUMINOUS MATTER
PARTICLE DECAY
RADIATIVE CORRECTIONS
RESONANCE
SUPERGRAVITY
SUPERSYMMETRY
UNIVERSE
YUKAWA POTENTIAL
ACCELERATORS
BOSONS
CORRECTIONS
CYCLIC ACCELERATORS
DECAY
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FIELD THEORIES
GEV RANGE
HADRONS
INTERACTIONS
LEPTONS
MATHEMATICAL MODELS
MATTER
NUCLEAR POTENTIAL
OPTICAL PROPERTIES
PARTICLE INTERACTIONS
PARTICLE MODELS
PHYSICAL PROPERTIES
POSTULATED PARTICLES
POTENTIALS
STORAGE RINGS
SYMMETRY
SYNCHROTRONS
UNIFIED-FIELD THEORIES