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arXiv 0907.4511hep-phastro-ph.COastro-ph.HE
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LHC暗物质间接探测的PAMELA反质子数据的意义

Implication of the PAMELA antiproton data for dark matter indirect detection at LHC

Celine Boehm, Timur Delahaye, Pierre Salati, Florian Staub, Ritesh K. Singh

摘要:

自从PAMELA实验得出银河系中“异常”的高正电子分数和反质子过剩的缺乏,就有大量研究提出了新类型的暗物质,即与电子的耦合大于与夸克的耦合。这就提出了在大型强子对撞机上产生暗物质粒子(以及重关联色态)的问题。在这里,我们探讨了一个非常简单的基准暗物质模型,并表明,尽管PAMELA反质子测量和预期的天体物理次级背景之间的协议,有空间的大耦合的WIMP候选重夸克。与人们天真的预期相反,PAMELA的pbar/p测量并没有对暗物质模型的建立提出挑战,就夸克扇区而言。因此亲夸克物质并不被禁止,由于这些大的耦合,人们可以预期,通过夸克-夸克和夸克-胶子相互作用,在LHC上开辟了一条新的生产通道。唉,当考虑到夸克的PDF时,大量生产的前景就消失了。

英文摘要:

Since the PAMELA results on the "anomalously" high positron fraction and the lack of antiproton excess in our Galaxy, there has been a tremendous number of studies advocating new types of dark matter, with larger couplings to electrons than to quarks. This raises the question of the production of dark matter particles (and heavy associated coloured states) at LHC. Here, we explore a very simple benchmark dark matter model and show that, in spite of the agreement between the PAMELA antiproton measurements and the expected astrophysical secondary background, there is room for large couplings of a WIMP candidate to heavy quarks. Contrary to what could have been naively anticipated, the PAMELA pbar/p measurements do not challenge dark matter model building, as far as the quark sector is concerned. A quarkophillic species is therefore not forbidden.Owing to these large couplings, one would expect that a new production channel opens up at the LHC, through quark--quark and quark--gluon interactions. Alas, when the PDF of the quark is taken into account, prospects for a copious production fade away.

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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