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arXiv 1902.01636hep-ex
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在$\sqrt{s} = 13$ TeV质子-质子碰撞数据的36.1 fb $^{-1}$中在PDKEEPAAA探测器中寻找重带电长寿命粒子

Search for heavy charged long-lived particles in the ATLAS detector in 36.1 fb$^{-1}$ of proton-proton collision data at $\sqrt{s} = 13$ TeV

ATLAS Collaboration

摘要:

利用ATLAS实验在大型强子对撞机上收集的36.1 fb $^{-1}$ TeV质子-质子碰撞的数据样本进行重带电长寿命粒子的搜索。搜索是基于与电离能损失和飞行时间相关的可观测量,这些可观测量对重带电粒子的速度非常敏感,其速度明显低于光速。多种搜索策略的广泛的寿命范围内,对应于几米的路径长度,被定义为模型独立的可能,通过参考几个代表性的物理情况下,产生长寿命的粒子超对称模型,如胶子/方($R$ -强子),charginos和staus。未观察到与预期标准模型背景的显著偏离。给出了长寿命$R$强子和直接成对产生的Staus和Charginos的产生截面在95%置信水平上的上限。这些结果转化为长寿命的胶子,sbottom和停止$R$ -强子的质量下限,以及staus和charginos的2000 GeV,1250 GeV,1340 GeV,430 GeV和1090 GeV,分别。

英文摘要:

A search for heavy charged long-lived particles is performed using a data sample of 36.1 fb$^{-1}$ of proton-proton collisions at $\sqrt{s} = 13$ TeV collected by the ATLAS experiment at the Large Hadron Collider. The search is based on observables related to ionization energy loss and time of flight, which are sensitive to the velocity of heavy charged particles traveling significantly slower than the speed of light. Multiple search strategies for a wide range of lifetimes, corresponding to path lengths of a few meters, are defined as model-independently as possible, by referencing several representative physics cases that yield long-lived particles within supersymmetric models, such as gluinos/squarks ($R$-hadrons), charginos and staus. No significant deviations from the expected Standard Model background are observed. Upper limits at 95% confidence level are provided on the production cross sections of long-lived $R$-hadrons as well as directly pair-produced staus and charginos. These results translate into lower limits on the masses of long-lived gluino, sbottom and stop $R$-hadrons, as well as staus and charginos of 2000 GeV, 1250 GeV, 1340 GeV, 430 GeV and 1090 GeV, respectively.

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