Inclusive γ(1S,2S,3S) photoproduction at the CEPC

Inclusive γ(1S,2S,3S) photoproduction at the future Circular-Electron-Positron-Collider(CEPC)is studied,using the non-relativistic quantum chromodynamics(NRQCD)factorization formalism.Including the contributions from both direct and resolved photons,we present different distributions for the γ(1S,2S,3S) production.Our results suggest that there will be considerable events,implying that well measurements of the T photoproduction can be performed to further study heavy quarkonium physics at electron-positron colliders,in addition to hadron colliders.This supplemental study is very important for clarifying the current situation regarding the heavy quarkonium production mechanism.

Corrections to R_D and R_(D~*) in the BLMSSM

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^＊）.

Z→l_i~±l_j~■ jprocesses in the BLMSSM

In a supersymmetric extension of the Standard Model（SM） where baryon and lepton numbers are local gauge symmetries（BLMSSM）, we investigate the charged lepton flavor violating（CLFV） processes Z→li^±lj^ jafter introducing new gauginos and right-handed neutrinos. In this model, the branching ratios of Z→li^±lj^ jare around（10^-8–10^-10）, which approach the present experimental upper bounds. We hope that the branching ratios for these CLFV processes can be detected in the near future.