Mapping the material in the LHCb vertex locator using secondary hadronic interactions
Mapping the material in the LHCb vertex locator using secondary hadronic interactions
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DOI：
10.1088/1748-0221/13/06/p06008
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发表时间：
2018-06-01
影响因子：
1.3
通讯作者：
Williams, M.
中科院分区：
文献类型：
--
作者：
Alexander, M.;Barter, W.;Williams, M.
精确了解LHCb顶点定位器（VELO）中物质的位置，对于减少寻找长寿命奇异粒子的背景，以及识别源自美丽夸克和魅力夸克的喷流，都是至关重要的。在束气碰撞中产生的强子的二次相互作用被用来绘制VELO中物质的位置。使用这个材质贴图，以及重建的次级顶点及其组成轨迹的属性，可以将p值分配给次级顶点起源于材质相互作用的假设。对这个过程的验证，提出了使用光子转换到量纲。
Precise knowledge of the location of the material in the LHCb vertex locator (VELO) is essential to reducing background in searches for long-lived exotic particles, and in identifying jets that originate from beauty and charm quarks. Secondary interactions of hadrons produced in beam-gas collisions are used to map the location of material in the VELO. Using this material map, along with properties of a reconstructed secondary vertex and its constituent tracks, a p-value can be assigned to the hypothesis that the secondary vertex originates from a material interaction. A validation of this procedure is presented using photon conversions to dimuons.