Theoretical Corrections of R_D and R_D^*

2023/06/29 by Xin-Xin Long, Shu-Min Zhao, Long, Xin-Xin +11
Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies #Scientific Research and Discoveries

paper · pdf · doi:10.48550/arxiv.2306.16779

openalex publication_date 2023/06/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01

Abstract

R_D^(*) is the ratio of branching ratio B → D^(*)τν_τ to B → D^(*)lν_l~(l=e,~μ). There is a gap of 2σ_exp or more between its experimental value and the prediction under the standard model(SM). People extend the MSSM with the local gauge group U(1)_X to obtain the U(1)_XSSM. Compared with MSSM, U(1)_XSSM has more superfields and effects. In U(1)_XSSM, we research the semileptonic decays B → D^(*)lν_l and calculate R_D^(*). The numerical results of R_D^(*) are further corrected under U(1)_XSSM, which are much better than the SM predictions. After correction, the theoretical value of R_D^(*) can reach one σ_exp range of the averaged experiment central value.

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