In this paper, we calculate the rare top quark decay t → ch in a supersymmetric extension of the Standard Model where baryon and lepton numbers are local gauge symmetries. Adopting reasonable assumptions on the param...In this paper, we calculate the rare top quark decay t → ch in a supersymmetric extension of the Standard Model where baryon and lepton numbers are local gauge symmetries. Adopting reasonable assumptions on the parameter space, we find that the branching ratios of t→ch can reach 10-3, which could be detected in the near future.展开更多
The deviation of the measurement of RD （RD＊） from the Standard Model （SM） expectation is 2.3σ （3.1σ）. RD （RD＊） is the ratio of the branching fraction of ^-B→Dτ^-υτ （^-B→D^＊τ^-υτ ） to that of ^-B...The deviation of the measurement of RD （RD＊） from the Standard Model （SM） expectation is 2.3σ （3.1σ）. RD （RD＊） is the ratio of the branching fraction of ^-B→Dτ^-υτ （^-B→D^＊τ^-υτ ） to that of ^-B→Dl^-υι （^-B→Dl^-υι）, where l=e or μ. This anomaly may imply the existence of new physics （NP）. In this paper, we restudy this problem in the supersymmetric extension of the Standard Model with local gauged baryon and lepton numbers （BLMSSM）, and give one-loop corrections to RD （RD^＊）.展开更多
Applying the effective Lagrangian method,we study the flavor changing neutral current process b→sγwithin the minimal supersymmetric extension of the Standard Model,where baryon and lepton numbers are local gauge sym...Applying the effective Lagrangian method,we study the flavor changing neutral current process b→sγwithin the minimal supersymmetric extension of the Standard Model,where baryon and lepton numbers are local gauge symmetries.Constraints on the parameters are investigated numerically with the experimental data for the branching ratioof B→X_(s)γAdditionally,we present the corrections to direct CP-violation in B→X_(s)γand time-de-pendent CP-asymmetry in B→K*γ.With appropriate assumptions on the parameters,we find the direct CP-viola-tion Acp is very small,while one-loop contributions to S K*γcan be significant.展开更多
基金Supported by National Natural Science Foundation of China(11275036)Open Project of State Key Laboratory of MathematicsMechanization(Y3KF311CJ1)+1 种基金Natural Science Foundation of Hebei Province of China(A2013201277)Natural Science Fund of Hebei University(2011JQ05,2012-242)
文摘In this paper, we calculate the rare top quark decay t → ch in a supersymmetric extension of the Standard Model where baryon and lepton numbers are local gauge symmetries. Adopting reasonable assumptions on the parameter space, we find that the branching ratios of t→ch can reach 10-3, which could be detected in the near future.
基金Supported by the NNSFC(11535002,11605037,11705045)the Natural Science Foundation of Hebei Province(A2016201010,A2016201069)+1 种基金the Natural Science Fund of Hebei University(2011JQ05,2012-242)and Hebei Key Lab of Opto-Electronic Information and Materials,the Midwest Universities Comprehensive Strength Promotion Project
文摘The deviation of the measurement of RD （RD＊） from the Standard Model （SM） expectation is 2.3σ （3.1σ）. RD （RD＊） is the ratio of the branching fraction of ^-B→Dτ^-υτ （^-B→D^＊τ^-υτ ） to that of ^-B→Dl^-υι （^-B→Dl^-υι）, where l=e or μ. This anomaly may imply the existence of new physics （NP）. In this paper, we restudy this problem in the supersymmetric extension of the Standard Model with local gauged baryon and lepton numbers （BLMSSM）, and give one-loop corrections to RD （RD^＊）.
基金National Natural Science Foundation of China(11805140,11347185,11905002)the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi(2017113)+2 种基金Natural Science Foundation of Shanxi Province(201801D221021,201801D221031)Natural Science Foundation of Hebei Province(A2020201002)the China Scholarship Council(201906935031)。
文摘Applying the effective Lagrangian method,we study the flavor changing neutral current process b→sγwithin the minimal supersymmetric extension of the Standard Model,where baryon and lepton numbers are local gauge symmetries.Constraints on the parameters are investigated numerically with the experimental data for the branching ratioof B→X_(s)γAdditionally,we present the corrections to direct CP-violation in B→X_(s)γand time-de-pendent CP-asymmetry in B→K*γ.With appropriate assumptions on the parameters,we find the direct CP-viola-tion Acp is very small,while one-loop contributions to S K*γcan be significant.
