Scalar mass dependence of angular variables in t(t)over-barφ production

被引：0

作者：

Azevedo, Duarte ^{[1
]}

Capucha, Rodrigo ^{[1
]}

Onofre, Antonio ^{[2
]}

Santos, Rui ^{[1
,3
]}

机构：

[1] Univ Lisbon, Fac Ciencias, Ctr Fis Teor & Computac, Edificio C8, P-1749016 Lisbon, Portugal

[2] Univ Minho, Dept Fis, P-4710057 Braga, Portugal

[3] Inst Politecn Lisboa, ISEL Inst Super Engn Lisboa, P-1959007 Lisbon, Portugal

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2020年 / 06期

关键词：

Beyond Standard Model; CP violation; LHC;

D O I：

10.1007/JHEP06(2020)155

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

In this paper we explore CP discrimination in the associated production of top-quark pairs (t (t) over bar) with a generic scalar boson (phi) at the LHC. We probe the CP-sensitivity of several observables for a varying scalar boson mass and CP-number, either CP-even (phi = H) or CP-odd (phi= A), using dileptonic final states of the t (t) over bar phi system, with phi -> (b) over bar. We show that CP-searches are virtually impossible for phi boson masses above a few hundred GeV in this channel. A full phenomenological analysis was performed, using Standard Model background and signal events generated with MadGraph5 aMC@NLO and reconstructed using a kinematic fit. The most sensitive CP-observables are used to compute Confidence Levels (CLs), as a function of luminosity, for the exclusion of different signal hypotheses with scalar and pseudoscalar boson masses that range from m(phi) = 40 GeV up to 200 GeV. We finalize by analysing the impact of a measurement (or limit) of the CP-violating angle in the parameter space of a complex two-Higgs doublet model known as the C2HDM.

引用

页数：32

共 50 条

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