Probing a pseudoscalar at the LHC in light of R(D^(*)) and muon g-2 excesses

2016/10/18 by Lei Wang, Jin Min Yang, Wang, Lei +3 · 1 citation
Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #hep-ex #hep-ph

paper · pdf · doi:10.48550/arxiv.1610.05681

20 pages, 4 figures; added references

arxiv created 2016/10/23 · arxiv updated 2016/10/25

Abstract

We study the excesses of R(D^(*)) and muon g-2 in the framework of a two-Higgs-doublet model with top quark flavor-changing neutral-current (FCNC) couplings. Considering the relevant theoretical and experimental constraints, we find that the R(D^(*)) and muon g-2 excesses can be simultaneously explained in a parameter space allowed by the constraints. In such a parameter space the pseudoscalar (A) has a mass between 20 GeV and 150 GeV so that it can be produced from the top quark FCNC decay t→ A c. Focusing on its dominant decay A→ ττ, we perform a detailed simulation on pp→ tt→ Wb Ac→ jjbcττ and find that the 2σ upper limits from a data set of 30 (100) fb^-1 at the 13 TeV LHC can mostly (entirely) exclude such a parameter space.

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