Heavy quarkonium production through the top quark rare decays via the channels involving flavor changing neutral currents

Juan-Juan Niu; Lei Guo; Hong-Hao Ma; Shao-Ming Wang

doi:10.1140/epjc/s10052-018-6126-0

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2024 Impact factor 4.8

Particles and Fields

Open Access

Eur. Phys. J. C (2018) 78: 657
https://doi.org/10.1140/epjc/s10052-018-6126-0

Regular Article - Theoretical Physics

Heavy quarkonium production through the top quark rare decays via the channels involving flavor changing neutral currents

Juan-Juan Niu¹, Lei Guo¹^*, Hong-Hao Ma² and Shao-Ming Wang¹

¹ Department of Physics, Chongqing University, Chongqing, 401331, People’s Republic of China
² Faculdade de Engenharia de Guaratinguetá, Universidade Estadual Paulista, Guaratinguetá, SP, 12516-410, Brazil

^* e-mail: guoleicqu@cqu.edu.cn

Received: 17 April 2018
Accepted: 1 August 2018
Published online: 17 August 2018

Abstract

In the paper, we discuss the possibility of observation of heavy quarkoniums via the processes involving flavor changing neutral currents (FCNC). More explicitly, we systematically calculate the production of heavy charmonium and $(c{\bar{b}})$ -quarkonium through the top quark semi-exclusive rare FCNC decays in the framework of the non-relativistic QCD (NRQCD) factorization theory. Our results show that the total decay widths $\Gamma _{t\rightarrow \eta _c} =1.20^{+1.04+1.14}_{-0.51-0.45}\times 10^{-16}$ GeV, $\Gamma _{t\rightarrow J/\psi } =1.37^{+1.03+1.30}_{-0.51-0.51}\times 10^{-16}$ GeV, $\Gamma _{t\rightarrow B_c}=2.06^{+0.17+0.91}_{-0.17-0.54}\times 10^{-18}$ GeV, and $\Gamma _{t\rightarrow B^*_c}=6.27^{+0.63+2.78}_{-0.62-1.64}\times 10^{-18}$ GeV, where the uncertainties are from variation of quark masses and renormalization scales. Even though the decay widths are small, it is important to make a systematic study on the production of charmonium and $(c{\bar{b}})$ -quarkonium through the top-quark decays via FCNC in the Standard Model, which will provide useful guidance for future new physics research from the heavy quarkonium involved processes.