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Dynamics of scalar fields in an expanding/contracting cosmos at finite temperature

Chinese Physics C 2020年第5期44卷 22-42页

作者： Hui Xu Lei Ming yeuk-kwan echeung School of Physics Nanjing UniversityNanjing210093Chin Institute of Nuclear and Particle Physics Demokritos National Research CentreAthensGreece

This study extends the investigation of quantum dissipative effects of a cosmological scalar field by taking into account cosmic expansion and ***,Drewes,Kang,and Kim calculated the effective action and quantum dissipative effects of a cosmological scalar field in a recent work,where analytical expressions for the effective potential and damping coefficient were presented using a simple scalar model with quartic interactions,and the work was conducted using Minkowski-space propagators in loop *** this work,we incorporate the Hubble expansion and contraction of the cosmic background and focus on the thermal dynamics of a scalar field in a regime where the effective potential changes *** that the Hubble parameter,H,attains a small but non-zero value,we carry out calculations to the first order in *** we set H=0,all results match those in flat ***,we must integrate over the resonances,which in turn leads to an amplification of the effects of a non-zero *** is an intriguing phenomenon,which cannot be uncovered in flat *** implications on particle creations in the early universe will be studied in a forthcoming study.

关键词： quantum dissipative effects thermal field theory scalar field dynamics cosmological expansion

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Analysis of B_(c)→τν_(τ) at CEPC

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Chinese Physics C 2021年第2期45卷 39-47页

作者： Taifan Zheng Ji Xu Lu Cao Dan Yu Wei Wang Soeren Prell yeuk-kwan echeung Manqi Ruan School of Physics Nanjing UniversityNanjing 210023China INPAC SKLPPCMOE KLPPCSchool of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Physikalisches Institut der Rheinischen Friedrich-Wilhelms-Universität Bonn 53115 BonnGermany Institute of High Energy Physics Beijing 100049China Department of Physics and Astronomy Iowa State UniversityAmesIAUSA

Precise determination of the B_(c)→τν_(τ) branching ratio provides an advantageous opportunity for under-standing the electroweak structure of the Standard Model,measuring the CKM matrix element |V_(cb)|,and probing new physics *** this paper,we discuss the potential of measuring the process B_(c)→ τν_(τ)withτdecaying leptonically at the proposed Circular Electron Positron Collider(CEPC).We conclude that during the Z pole opera-tion,the channel signal can achieve five-σsignificance with~10^9 Z decays,and the signal strength accuracies for B_(c)→τν_(τ) can reach around 1%level at the nominal CEPC Z pole statistics of one tillion Z decays,assuming the total B_(c)→τν_(τ) yield is 3.6x 10^(6).Our theoretical analysis indicates the accuracy could provide a strong constraint on the general effective Hamiltonian for the b→cτν *** the total Be yield can be determined to 0(1%)level of accuracy in the future,these results also imply|V_(cb)| could be measured up to 0(1%)level of accuracy.

关键词： CEPC Flavor B_(c)meson

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