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arXiv 1410.3239hep-ph
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SUSY对费米银河中心过剩的解释及其在LHC Run- II上的检验

SUSY explanation of the Fermi Galactic Center Excess and its test at LHC Run-II

Junjie Cao, Liangliang Shang, Peiwen Wu, Jin Min Yang, Yang Zhang

摘要:

我们探讨了次极小超对称标准模型中费米银河中心过剩(GCE)的解释。我们系统地考虑了各种实验约束,包括暗物质(DM)的遗迹密度,DM直接探测结果和间接搜索矮星系。我们发现,对于质量范围从$30 {\rm GeV}$到$40 {\rm GeV}$的DM,只有当CP奇标量满足$m_a \simeq 2 m_χ$时,GCE才能用湮灭$χχ\to a^\ast \to b \bar{b}$来解释,并且为了获得测量的DM遗迹密度,在早期宇宙中必须有相当大的$Z$介导的DM湮灭贡献。结果表明,$μ$的上限约为350 GeV。对14-TeV LHC中性伴子/电荷伴子产生的$3\ell+ E_T^{miss}$信号的详细Monte Carlo模拟表明,在$95\%$ C. L.积分光度为100(200)fb $^{-1}$。我们还讨论了可能的大$Z$耦合DM的DM-核子自旋相关(SD)散射截面的含义,并发现,虽然目前的实验界$σ^{\rm SD}_p$是严格的自旋无关(SI)的结果,未来的XENON-1 T和LZ数据可能能够测试的GCE青睐的参数区域的大部分。

英文摘要:

We explore the explanation of the Fermi Galactic Center Excess (GCE) in the Next-to-Minimal Supersymmetric Standard Model. We systematically consider various experimental constraints including the Dark Matter (DM) relic density, DM direct detection results and indirect searches from dwarf galaxies. We find that, for DM with mass ranging from $30 {\rm GeV}$ to $40 {\rm GeV}$, the GCE can be explained by the annihilation $χχ\to a^\ast \to b \bar{b}$ only when the CP-odd scalar satisfies $m_a \simeq 2 m_χ$, and in order to obtain the measured DM relic density, a sizable $Z$-mediated contribution to DM annihilation must intervene in the early universe. As a result, the higgsino mass $μ$ is upper bounded by about 350 GeV. Detailed Monte Carlo simulations on the $3\ell+ E_T^{miss}$ signal from neutralino/chargino associated production at 14-TeV LHC indicate that the explanation can be mostly (completely) excluded at $95\%$ C.L. with an integrated luminosity of 100(200) fb$^{-1}$. We also discuss the implication of possible large $Z$ coupling to DM for the DM-nucleon spin dependent (SD) scattering cross section, and find that although the current experimental bounds on $σ^{\rm SD}_p$ is less stringent than the spin independent (SI) results, the future XENON-1T and LZ data may be capable of testing most parts of the GCE-favored parameter region.

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