Strong Couplings of Three Mesons with Charm(ing) Involvement

Single- and central-diffractive production of open charm and bottom mesons at the LHC

We discuss diffractive production of open charm and bottom mesons at the LHC. The differential cross sections for single- and central-diffractive mechanisms for $c\bar c$ and $b\bar b$ pair production are calculated in the framework of the Ingelman-Schlein model corrected for absorption effects. The LO gluon-gluon fusion and quark-antiquark anihilation partonic subprocesses are taken into consideration, which are calculated within standard collinear approximation. The extra corrections from reggeon exchanges are taken into account. The hadronization of charm and bottom quarks is taken into acc…

Anomalous B meson mixing and baryogenesis in a two Higgs doublet model with top-charm flavor violation

There exist experimental hints from the B sector for CP violation beyond the Standard Model (SM) CKM paradigm. An anomalous dimuon asymmetry was reported by the D0 collaboration, while tension exists between $B \to τν$ and $S_{ψK}$. These measurements, disfavoring the SM at the ~3$σ$ level, can be explained by new physics in both $B_d$-$\bar{B}_d$ and $B_s$- $\bar{B}_s$ mixing, arising from (1) new bosonic degrees of freedom at or near the electroweak scale, and (2) new, large CP-violating phases. These two new physics ingredients are precisely what is required for electroweak baryogenesis to …

Single- and central-diffractive production of open charm and bottom mesons at the LHC: theoretical predictions and experimental capabilities

We discuss diffractive production of open charm and bottom mesons at the LHC. The differential cross sections for single- and central-diffractive mechanisms for $c\bar c$ and $b\bar b$ pair production are calculated in the framework of the Ingelman-Schlein model corrected for absorption effects. In this approach one assumes that the pomeron has a well defined partonic structure, and that the hard process takes place in a pomeron-proton or proton-pomeron (single diffraction) or pomeron-pomeron (central diffraction) processes. Here, leading-order gluon-gluon fusion and quark-antiquark anihilatio…

Final state interaction on $B^+ \to π^-π^+π^+$

The large localized CP asymmetries observed by LHCb in three-body charmless decays of $B$ mesons brings new challenge for experimentalists and their traditional models to fit data. With higher statistics, rescattering and three-body effects, previously ignored on data analysis, become more visible. The time is ripe to use better theoretical assumptions as an ingredient in order to improve the analysis. In this paper we address the issue of rescattering effects in the charmless three-body decays of $B$ mesons. In particular, we study the case of the $B^+ \to π^-π^+π^+$ decay and show that the p…

质子的粲夸克含量：一种解析计算

Charm content of the proton: An analytic calculation

本文首次用解析方法直接计算质子中内在粲夸克成分的贡献，估计五夸克态$\vert u u d c \bar{c}\rangle$的贡献为$(1.36\pm0.67)\\%$，为验证质子波函数中的重夸克成分提供了新途径。