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arXiv 0908.2258hep-ph
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暗物质湮灭和衰变的Gamma Ray谱

Gamma Ray Spectra from Dark Matter Annihilation and Decay

Jean-François Fortin, Jessie Shelton, Scott Thomas, Yue Zhao

摘要:

在本文中,我们研究了暗物质湮灭和衰变的各种情况下的伽马射线谱。我们专注于只产生高能光子或轻子和光子的过程,但没有质子-反质子对,与PAMELA的数据兼容。我们研究了两体衰变链直接产生的光子和与带电粒子一起产生的光子。对于前一种情况,我们还包括过程DM(+DM)-> N phi -> 2N伽玛,它可以产生于特定的强耦合暗物质的情况。对于后一种情况,光子要么是由高能轻子的终态辐射产生的,要么是由积分出重模后获得的高阶(不可重正化)算符所代表的接触相互作用直接产生的。我们比较他们的整体湮灭截面/衰变率考虑手征抑制(在s-波近似),运营商和暗物质粒子属性的尺寸。一个粗略的估计表明,对于一个暗物质粒子的质量为O(1 TeV),硬光子谱中的直接电子-正电子-光子的最终状态所产生的标量玻色子暗物质湮灭/衰变或马约拉纳费米子暗物质湮灭的高阶运营商,如果主导运营商的规模低于O(1000 TeV)。否则,以这种方式产生的所有光子光谱都由终态辐射支配。在所研究的谱中,高阶算符谱是最难的,而具有中间衰变的末态辐射谱是最软的。

英文摘要:

In this paper, we study gamma ray spectra for various scenarios of dark matter annihilation and decay. We focus on processes which generate only high-energy photons or leptons and photons, but no proton-antiproton pairs, to be compatible with PAMELA's data. We investigate photons produced directly from two-body decay chains and photons produced together with charged particles. For the former case we also include the process DM(+DM) -> N phi -> 2N gamma which can arise from specific strongly-coupled dark matter scenarios. For the latter case, photons are either generated by final state radiation from high-energy leptons or are directly generated from contact interactions represented by higher-order (non-renormalizable) operators obtained after integrating out heavy modes. We compare their overall annihilation cross-sections/decay rates taking into account chiral suppression (in the s-wave approximation), dimension of operators and dark matter particle properties. A rough estimate shows that, for a dark matter particle with a mass of O(1 TeV), the hard photon spectra in direct electron-positron-photon final states arising from either scalar boson dark matter annihilation/decay or Majorana fermion dark matter annihilation are dominated by higher-order operators if the scale of the leading operator is lower than O(1000 TeV). Otherwise, all the photon spectra arising in this way are dominated by final state radiation. Among the spectra studied, the higher-order operators spectrum is the hardest while the final state radiation spectrum with an intermediate decay is the softest.

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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