Probe anomalous tq gamma couplings through single top photoproduction at the LHC
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论文类型：期刊论文
发表时间：2014-09-01
发表刊物：NUCLEAR PHYSICS B
收录刊物：SCIE、Scopus
卷号：886
期号：886
页面范围：691-711
ISSN号：0550-3213
摘要：In this work we study the constraints on the anomalous tq gamma (q = u, c) couplings by photon-produced leading single top production and single top jet associated production through the main reactions pp -> p gamma p -> Pt -> pW(-> l nu(l))b + X and pp -> p gamma p -> ptj -> pW(-> l nu(t))bj + X assuming a typical LHC multipurpose forward detectors in a model independent effective lagrangian approach. Our results show that: for the typical detector acceptance 0.0015 < xi(1) < 0.5, 0.1 < xi(2) < 0.5 and 0.0015 < xi(3) < 0.15 with a luminosity of 2 fb(-1), the lower bounds of kappa(tq gamma) through leading single top channel (single top jet channel) are 0.0130 (0.0156), 0.0218 (0.0206) and 0.0133 (0.01655), respectively, corresponding to Br(t -> q gamma) similar to 3 x 10(-5). With a luminosity of 200 fb(-1), the lower bounds of kappa(tq gamma) are 0.0041 (0.0048), 0.0069 (0.0064) and 0.0042 (0.0051), respectively, corresponding to Br(t -> q gamma) similar to 4 x 10(-6). We conclude that both channels can be used to detect such anomalous tq gamma couplings and the detection sensitivity on kappa(tq gamma) is obtained. (C) 2014 The Author. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/3.0/).
发表时间：2014-09-01