TeV =1.96时衰变到bbbar的中性长寿命粒子在ppbar碰撞中共振对产生的研究
Search for resonant pair production of neutral long-lived particles decaying to bbbar in ppbar collisions at sqrt(s)=1.96 TeV
摘要：
我们利用费米实验室Tevatron对撞机上D 0探测器记录的3.6 fb^-1的数据，首次对中性长寿命粒子（NLLP）的共振对产生进行了研究。我们搜索对位移顶点的跟踪检测器在半径范围内的1.6- 20厘米，从光束轴。没有观察到显著的过量高于背景，并且对于希格斯玻色子质量和NLLP质量和寿命的范围，在隐谷基准模型中对产生速率设置上限。
英文摘要：
We report on a first search for resonant pair production of neutral long-lived particles (NLLP) which each decay to a bbbar pair, using 3.6 fb^-1 of data recorded with the D0 detector at the Fermilab Tevatron collider. We search for pairs of displaced vertices in the tracking detector at radii in the range 1.6--20 cm from the beam axis. No significant excess is observed above background, and upper limits are set on the production rate in a hidden-valley benchmark model for a range of Higgs boson masses and NLLP masses and lifetimes.
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