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arXiv 1609.04838hep-ph
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光子通过LHC的味变化中性流引发单顶夸克产生

Photon initiated single top quark production via flavor-changing neutral currents at the LHC

Reza Goldouzian, Barbara Clerbaux

摘要:

单顶夸克的产生是寻找新物理符号的强大过程。在这项工作中,我们提出并调查了顶夸克口味改变中性电流(FCNC)通过光子使用直接单顶夸克生产事件在质子-质子碰撞在欧洲核子研究中心的大型强子对撞机。结果表明,直接单顶夸克末态可以同时对tq $γ$(top-quark- $γ$)和tqg(top-quark-gluon)FCNC耦合的强度提供约束.由ATLAS协作组在质心能量为8 TeV的大型强子对撞机上进行的直接单顶夸克产生的搜索结果被用来设置通过直接单顶夸克产生的异常FCNC顶衰变分支分数${\cal B}$(t $\rightarrow$ u $γ$)$<$ 0.05%和${\cal B}$(t $\rightarrow$ c $γ$)$<$ 0.14%的第一个实验极限。最后,提出了在13 TeV的探测tq $γ$耦合的通道的灵敏度。

英文摘要:

Single top quark production is a powerful process to search for new physics signs. In this work we propose and investigate a search for top quark flavor changing neutral currents (FCNC) via a photon using direct single top quark production events in proton-proton collisions at the LHC at CERN. We show that the direct single top quark final state can provide constraints on the strengths of tq$γ$ (top-quark-$γ$) and tqg (top-quark-gluon) FCNC couplings simultaneously. Results of a search for direct single top quark production at the LHC at a center-of-mass energy of 8 TeV performed by the ATLAS collaboration are used to set first experimental limits on the anomalous FCNC top decay branching fractions ${\cal B}$(t$\rightarrow$ u$γ$) $<$ 0.05% and ${\cal B}$(t$\rightarrow$ c$γ$) $<$ 0.14% via direct single top quark production. Finally, the sensitivity of the proposed channel for probing the tq$γ$ couplings at 13 TeV is presented.

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