Search for chargino-neutralino production using recursive jigsaw reconstruction in final states with two or three charged leptons in proton-proton collisions at $\sqrt{s}$=13 TeV with the ATLAS detector
Search for chargino-neutralino production using recursive jigsaw reconstruction in final states with two or three charged leptons in proton-proton collisions at $\sqrt{s}$=13 TeV with the ATLAS detector
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DOI：
10.1103/physrevd.98.092012
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发表时间：
2018-06
期刊：
影响因子：
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通讯作者：
M. Aaboud;A. Kupco;S. Webb;T. Dreyer;Yufeng Wang;K. Jakobs;M. Spousta;M. Cobal;Peilong Wang-Peil
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文献类型：
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作者：
M. Aaboud;A. Kupco;S. Webb;T. Dreyer;Yufeng Wang;K. Jakobs;M. Spousta;M. Cobal;Peilong Wang-Peil
用递归拼图重建方法研究了两轻子末态和三轻子末态超对称粒子的电弱产生。这次搜索使用了2015年和2016年ATLAS实验在CERN大型强子对撞机上进行的=13TeV质子-质子碰撞中收集的数据，对应的积分光度为36.1FB$^{-1}$。研究了通过W/Z玻色子衰变的Chargino-中性微子对的产生，在涉及轻子和喷注的终态以及在母粒子和最轻超对称粒子之间存在大的和中等的质量分裂的情况下，以及在这种质量分裂接近Z玻色子的情况下，失去横向动量的情况。后一种情况具有挑战性，因为矢量玻色子的产生具有类似于标准模型过程中的运动学性质。结果发现，在以大质量和中等质量分裂为目标的信号区，结果与标准模型的预期一致，对于无质量的最轻的超对称粒子，高达600GeV的荷电中性子质量在95%的置信度下被排除。在以低质量分裂为目标的信号区中发现了高于预期本底的过量数据，最大的局部过剩达到3.0标准差。
A search for electroweak production of supersymmetric particles is performed in two-lepton and three-lepton final states using recursive jigsaw reconstruction. The search uses data collected in 2015 and 2016 by the ATLAS experiment in $\sqrt{s}$ = 13 TeV proton--proton collisions at the CERN Large Hadron Collider corresponding to an integrated luminosity of 36.1 fb$^{-1}$. Chargino-neutralino pair production, with decays via W/Z bosons, is studied in final states involving leptons and jets and missing transverse momentum for scenarios with large and intermediate mass-splittings between the parent particle and lightest supersymmetric particle, as well as for the scenario where this mass splitting is close to the mass of the Z boson. The latter case is challenging since the vector bosons are produced with kinematic properties that are similar to those in Standard Model processes. Results are found to be compatible with the Standard Model expectations in the signal regions targeting large and intermediate mass-splittings, and chargino-neutralino masses up to 600 GeV are excluded at 95% confidence level for a massless lightest supersymmetric particle. Excesses of data above the expected background are found in the signal regions targeting low mass-splittings, and the largest local excess amounts to 3.0 standard deviations.