优化像素tracklet搜索以缩短生命周期
Optimizing pixel tracklet searches for shorter lifetimes
摘要：
像素tracklets，消失的轨道重建，只有像素命中，已被证明是一个很有前途的技术，在LHC分析中寻找暗物质候选人在LHC属于一个近简并的电弱多重态。然而，一个伪狄拉克电弱二重费米子，可以说是最有趣的这种可能性，具有较短的寿命，因此现有的tracklet搜索在这种情况下不太敏感。我们评估的tracklet搜索的性能优化寿命较短的tracklet重建只需要三个像素的命中，并要求一个伴随的软跟踪抑制背景。我们估计有多远的现有搜索的灵敏度可以扩展到该区域的参数空间与此优化的搜索。
英文摘要：
Pixel tracklets, disappearing tracks reconstructed with only pixel hits, have proven to be a promising technique in LHC analyses to search for dark matter candidates at the LHC that belong to a nearly-degenerate electroweak multiplet. However, a Pseudo-Dirac electroweak doublet fermion, arguably the most interesting such possibility, has a shorter lifetime and therefore existing tracklet searches are less sensitive in this case. We assess the performance of a tracklet search optimized for shorter lifetimes by requiring only three pixel hits for the tracklet reconstruction, and by demanding an accompanying soft track for suppressing backgrounds. We estimate how far the sensitivity of existing searches can be extended into the region of parameter space with this optimized search.
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