Probing an MeV-scale scalar boson in association with a TeV-Scale top-quark partner at the LHC
Probing an MeV-scale scalar boson in association with a TeV-Scale top-quark partner at the LHC
复制标题
DOI：
10.1007/jhep03(2023)164
复制
发表时间：
2022-02
影响因子：
5.4
通讯作者：
B. Dutta;Sumit Ghosh;A. Gurrola;Dale Julson;T. Kamon;J. Kumar
中科院分区：
文献类型：
--
作者：
B. Dutta;Sumit Ghosh;A. Gurrola;Dale Julson;T. Kamon;J. Kumar
在固定目标实验和e+ e -对撞机上，人们一直在积极地寻找新的低质量物质和介质粒子。在欧洲核子研究中心（CERN）的大型强子对撞机（LHC）中，这是一个挑战，但它们已经在ATLAS和CMS合作项目的希格斯玻色子衰变和B介子衰变中得到了寻找，以及在前向散射过程（如FASER）产生的低横向动量现象中得到了寻找。我们建议寻找与重矢量夸克相关的新的标量粒子。我们考虑的场景顶夸克(t)夫妇轻标量ϕ的和一个沉重的向量顶夸克的t t .我们检查单一和对生产pp碰撞,导致最终状态的顶夸克衰变纯粹hadronically,一个衰变semileptonically t (t→W + b→ℓνb),和一个ϕ的很提振和衰变的一对平行光子可以确认为合并后的光子系统。假设综合光度为3000 fb−1，对于m (T)大至1.8 (2)TeV, m （ϕ’）小至1 MeV，所提出的搜索预计将实现信号显著性大于5σ (3σ)的发现范围。这种搜索可以扩大T的范围，并证明大型强子对撞机可以探测低质量、mev尺度的粒子。
Searches for new low-mass matter and mediator particles have actively been pursued at fixed target experiments and at e+ e− colliders. It is challenging at the CERN LHC, but they have been searched for in Higgs boson decays and in B meson decays by the ATLAS and CMS Collaborations, as well as in a low transverse momentum phenomena from forward scattering processes (eg, FASER). We propose a search for a new scalar particle in association with a heavy vector-like quark. We consider the scenario in which the top quark (t) couples to a light scalar ϕ′ and a heavy vector-like top quark T. We examine single and pair production of T in pp collisions, resulting in a final state with a top quark that decays purely hadronically, a T which decays semileptonically (T→ W+ b→ ℓ ν b), and a ϕ′ that is very boosted and decays to a pair of collimated photons which can be identified as a merged photon system. The proposed search is expected to achieve a discovery reach with signal significance greater than 5σ (3σ) for m (T) as large as 1.8 (2) TeV and m (ϕ′) as small as 1 MeV, assuming an integrated luminosity of 3000 fb− 1. This search can expand the reach of T, and demonstrates that the LHC can probe low-mass, MeV-scale particles.