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

Abstract

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 tomore » 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}.« less

Authors:
;  [1]; ;  [2]
  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)
Publication Date:
OSTI Identifier:
21608070
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 84; Journal Issue: 9; Other Information: DOI: 10.1103/PhysRevD.84.095029; (c) 2011 American Institute of Physics; 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; 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

Citation Formats

Baer, Howard, Kao, Chung, Belyaev, Alexander, and Svantesson, Patrik. Exploring neutralino dark matter resonance annihilation via bA,bH{yields}b{mu}{sup +}{mu}{sup -} at the LHC. United States: N. p., 2011. Web. doi:10.1103/PHYSREVD.84.095029.
Baer, Howard, Kao, Chung, Belyaev, Alexander, & Svantesson, Patrik. Exploring neutralino dark matter resonance annihilation via bA,bH{yields}b{mu}{sup +}{mu}{sup -} at the LHC. United States. https://doi.org/10.1103/PHYSREVD.84.095029
Baer, Howard, Kao, Chung, Belyaev, Alexander, and Svantesson, Patrik. Tue . "Exploring neutralino dark matter resonance annihilation via bA,bH{yields}b{mu}{sup +}{mu}{sup -} at the LHC". United States. https://doi.org/10.1103/PHYSREVD.84.095029.
@article{osti_21608070,
title = {Exploring neutralino dark matter resonance annihilation via bA,bH{yields}b{mu}{sup +}{mu}{sup -} at the LHC},
author = {Baer, Howard and Kao, Chung and Belyaev, Alexander and Svantesson, Patrik},
abstractNote = {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}.},
doi = {10.1103/PHYSREVD.84.095029},
url = {https://www.osti.gov/biblio/21608070}, journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 9,
volume = 84,
place = {United States},
year = {2011},
month = {11}
}