Neutralino dark matter in mSUGRA/CMSSM with a 125 GeV light Higgs scalar

被引：96
作者：
Baer, Howard [1 ]
Barger, Vernon [2 ]
Mustafayev, Azar [3 ]
机构：
[1] Univ Oklahoma, Dept Phys & Astron, Norman, OK 73019 USA
[2] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA
[3] Univ Minnesota, William I Fine Theoret Phys Inst, Minneapolis, MN 55455 USA
来源：
JOURNAL OF HIGH ENERGY PHYSICS | 2012年 / 05期
关键词：
Supersymmetry Phenomenology; GRAND UNIFIED THEORIES; LARGE HADRON COLLIDER; MINIMAL SUPERGRAVITY; BOSON MASS; RELIC DENSITY; RADIATIVE-CORRECTIONS; STAU COANNIHILATION; PARAMETER SPACE; SUPERSYMMETRY; MSSM;
D O I：
10.1007/JHEP05(2012)091
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
The minimal supergravity (mSUGRA or CMSSM) model is an oft-used framework for exhibiting the properties of neutralino (WIMP) cold dark matter (CDM). However, the recent evidence from Atlas and CMS on a light Higgs scalar with mass m(h) similar or equal to 125 GeV highly constrains the superparticle mass spectrum, which in turn constrains the neutralino annihilation mechanisms in the early universe. We find that stau and stop co-annihilation mechanisms - already highly stressed by the latest Atlas/CMS results on SUSY searches - are nearly eliminated if indeed the light Higgs scalar has mass m(h) similar or equal to 125 GeV. Furthermore, neutralino annihilation via the A-resonance is nearly ruled out in mSUGRA so that it is exceedingly difficult to generate thermally-produced neutralino-only dark matter at the measured abundance. The remaining possibility lies in the focus-point region which now moves out to m(0) similar to 10 - 20 TeV range due to the required large trilinear soft SUSY breaking term A(0). The remaining HB/FP region is more tine-tuned than before owing to the typically large top squark masses. We present updated direct and indirect detection rates for neutralino dark matter. and show that ton scale noble liquid detectors will either discover mixed higgsino CDM or essentially rule out thermally-produced neutralino-only CDM in the mSUGRA model.
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页数：24
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