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arXiv 1202.4038hep-phastro-ph.HE
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具有125 GeV轻Higgs标量的mSUGRA/CMSSM中的中性子暗物质

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

Howard Baer, Vernon Barger, Azar Mustafayev

摘要:

最小超引力(mSUGRA或CMSSM)模型是描述中性伴子(WIMP)冷暗物质(CDM)性质的常用框架。然而,最近来自Atlas和CMS的关于质量为m_h \simeq 125 GeV的轻Higgs标量的证据高度限制了超粒子质量谱,这反过来又限制了早期宇宙中的中性伴子湮灭机制。我们发现,stau和停止共同湮灭机制-已经高度强调的最新阿特拉斯/CMS结果超对称搜索-几乎消除,如果确实轻希格斯标量的质量m_h \simeq 125 GeV。此外,在mSUGRA中基本上排除了通过A共振的中性伴子湮灭,因此在测量的丰度下产生热产生的纯中性伴子暗物质非常困难。剩余的可能性在于焦点区域,由于需要大的三线性软超对称性破缺项A_0,该焦点区域现在移出到m_0 \sim 10-20 TeV范围。剩余的HB/FP区域由于通常较大的顶夸克质量而比以前更精细地调整。我们提出了更新的直接和间接的检测率中性伴暗物质,并表明吨级的稀有液体探测器将发现混合higgsino CDM或基本上排除热产生的中性伴只有CDM的mSUGRA模型。

英文摘要:

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\simeq 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\simeq 125 GeV. Furthermore, neutralino annihilation via the A-resonance is essentially 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\sim 10-20 TeV range due to the required large trilinear soft SUSY breaking term A_0. The remaining HB/FP region is more fine-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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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