Search for Single Production of Vector-Like Quarks Decaying into a b Quark and a W Boson in Proton

DOI：

发表时间：

2017-07

期刊：

Physical Review D

影响因子：

通讯作者：

中科院分区：

物理与天体物理2区

文献类型：

作者：

D. Abercrombie;B. Allen;A. Apyan;V. Azzolini;R. Barbieri;A. Baty;R. Bi;K. Bierwagen;S. Brandt;W. Busza;I. Cali;M. D'Alfonso;Z. Demiragli;L. Matteo;G. Gomez-Ceballos;M. Goncharov;D. Hsu;Y. Iiyama;G. Innocenti;M. Klute;D. Kovalskyi;K. Krajczár;Y. Lai;Yen-Jie Lee;A. Levin;P. D. Luckey;B. Maier;A. Marini;C. Mcginn;C. Mironov;S. Narayanan;X. Niu;C. Paus;C. Roland;G. Roland;J. Salfeld-Nebgen;G. Stephans;K. Tatar;M. Varma;D. Velicanu;J. Veverka;Jing Wang;Ta-Wei Wang;B. Wyslouch;Mingming Yang

寻找一个重的类矢量夸克，它衰变成一个b夸克和一个W玻色子，它是与一个轻的ﬂ夸克和一个b夸克一起单独产生的。这项分析是使用2015年大型强子对撞机收集的质心能量为√S=13TeV的质子-质子碰撞数据样本进行的。分析中使用的数据集对应于2.3fb−1的积分光度。使用包含一个电子或Muon、至少一个具有大横向动量的b标记喷流、探测器前部区域中的至少一个喷流以及丢失横向动量的事件来进行搜索。没有观察到超过标准模型预测的过剩。对重奇异夸克的产生截面设置了上限：一个T夸克的电荷为2/3，一个Y夸克的电荷为−4/3。对于耦合为0.5且B(Y→BW)=100%的Y夸克，观测到的(预期的)质量下限为1.4(1.0)TeV。这是迄今为止对类Y矢量夸克单次产生的最严格限制。

A search is presented for a heavy vector-like quark, decaying into a b quark and a W boson, which is produced singly in association with a light ﬂavor quark and a b quark. The analysis is performed using a data sample of proton–proton collisions at a center-of-mass energy of √ s = 13 TeV collected at the LHC in 2015. The data set used in the analysis corresponds to an integrated luminosity of 2.3fb − 1 . The search is carried out using events containing one electron or muon, at least one b-tagged jet with large transverse momentum, at least one jet in the forward region of the detector, and missing transverse momentum. No excess over the standard model prediction is observed. Upper limits are placed on the production cross section of heavy exotic quarks: a T quark with a charge of 2 / 3, and a Y quark with a charge of − 4 / 3. For Y quarks with coupling of 0.5 and B ( Y → bW ) = 100%, the observed (expected) lower mass limits are 1.40 (1.0)TeV. This is the most stringent limit to date on the single production of the Y vector-like quark.

Search for Single Production of Vector-Like Quarks Decaying into a b Quark and a W Boson in Proton–proton Collisions at √s = 13 TeV

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