arXiv 1708.022432017-08hep-phhep-ex

在大型强子对撞机上追踪夸克

Tracking down Quirks at the Large Hadron Collider

Simon Knapen, Hou Keong Lou, Michele Papucci, Jack Setford

备注：: 9 pages, 10 figures, submitted to PRD, minor changes
发表信息：: Phys. Rev. D 96, 115015 (2017)
DOI：: 10.1103/PhysRevD.96.115015

摘要：

非螺旋轨道是带电和/或有色夸克的确凿证据，这些夸克是由一种新的长程约束力束缚的粒子对。我们提出了一种方法来有效地搜索这些非螺旋轨道在大型强子对撞机，而不需要适合他们的轨迹。我们发现，可以有效地选择对应于古怪的轨迹的命中通过搜索ATLAS和CMS跟踪器的内层中的共面命中，即使在平均50个堆积顶点的存在下。我们进一步认为，光子转换和无关堆积命中的背景几乎可以完全去除，同时保持高达70%的信号重建效率。与300 fb的$^{-1}$数据集，这意味着一个发现的潜力弦张力之间的100 eV和30 keV的，和彩色（电弱带电）的怪癖一样重，1600（650）GeV可能会被发现。

英文摘要：

Non-helical tracks are the smoking gun signature of charged and/or colored quirks, which are pairs of particles bound by a new, long-range confining force. We propose a method to efficiently search for these non-helical tracks at the LHC, without the need to fit their trajectories. We show that the hits corresponding to quirky trajectories can be selected efficiently by searching for co-planar hits in the inner layers of the ATLAS and CMS trackers, even in the presence of on average 50 pile-up vertices. We further argue that backgrounds from photon conversions and unassociated pile-up hits can be removed almost entirely, while maintaining a signal reconstruction efficiency as high as 70%. With the 300 fb$^{-1}$ dataset, this implies a discovery potential for string tension between 100 eV and 30 keV, and colored (electroweak charged) quirks as heavy as 1600 (650) GeV may be discovered.

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