arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1604.01899hep-phastro-ph.HEhep-ex
收藏

Gamma-ray三角形:间接搜索中不对称暗物质的可能特征

Gamma-ray triangles: a possible signature of asymmetric dark matter in indirect searches

Alejandro Ibarra, Sergio Lopez-Gehler, Emiliano Molinaro, Miguel Pato

摘要:

本文介绍了一种新的γ射线谱特征,我们称之为γ射线三角形。这种光谱特征出现在暗物质通过手征相互作用自我湮灭成两个狄拉克费米子,随后在飞行中衰变成另一个费米子和一个光子的情况下。由此产生的光子光谱类似于一个尖锐的三角形,可以很容易地在伽马射线天空中寻找。使用Fermi-LAT和HESS的数据仪器,我们没有发现这样的光谱特征的证据,因此设置相应的湮没截面强上限。产生伽马射线三角形的一个具体实现方案包括一个不对称的暗物质模型,其中暗物质粒子携带轻子数。我们明确地表明,这类模型可以导致强烈的伽马射线光谱特征,可能在即将到来的伽马射线望远镜的范围内,打开一个新的窗口,通过间接搜索探索非对称暗物质。

英文摘要:

We introduce a new type of gamma-ray spectral feature, which we denominate gamma-ray triangle. This spectral feature arises in scenarios where dark matter self-annihilates via a chiral interaction into two Dirac fermions, which subsequently decay in flight into another fermion and a photon. The resulting photon spectrum resembles a sharp triangle and can be readily searched for in the gamma-ray sky. Using data from the Fermi-LAT and H.E.S.S. instruments, we find no evidence for such spectral feature and therefore set strong upper bounds on the corresponding annihilation cross section. A concrete realization of a scenario yielding gamma-ray triangles consists of an asymmetric dark matter model where the dark matter particle carries lepton number. We show explicitly that this class of models can lead to intense gamma-ray spectral features, potentially at the reach of upcoming gamma-ray telescopes, opening a new window to explore asymmetric dark matter through indirect searches.

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。

↑