The Belle-II experiment has recently reported the first measurement of $B^+ \to K ^+\nu \nu$ decay which
exceeds the Standard Model prediction by approximately 2.7$\sigma$. The deviation may indicate the
presence of new physics beyond the Standard Model in the $b \to s \nu \nu$sector. Under this assumption,
we study the hadronic $\Lambda_b \to \Lambda \nu \nu$ and $\Lambda_b \to...
We present an web-based platform for Amplitude Analysis, designed to facilitate the exploration of multi-body decays. In such analyses, the large number of possible decay chains often presents a significant challenge in constructing amplitudes.
Our tool offers a user-friendly graphical interface (GUI) that enables efficient sorting, filtering, filling, and validation of decay chains....
The violation of the charge-parity (CP) transformation symmetry, which although has been observed in plenty of pure meson decay processes, was only confirmed just very recently by the LHCb collaboration in the four-body decay of the heavy baryon $\Lambda_b^0$, $\Lambda_b^0\to p K^- \pi^+ \pi ^-$, through a comparison of the decay branching ratio with that of the CP-conjugate process.However,...
Search for the charmless baryonic decay $B^+\to\bar{\Lambda}p\bar{p}p$ is performed using proton-proton collision data recorded by the LHCb experiment, corresponding to an integrated luminosity of 5.4$\text{fb}^{-1}$. The branching fraction is measured to be $\mathcal{B}(B^+\to\bar{\Lambda}p\bar{p}p) = (2.08 \pm 0.34 \pm 0.10 \pm 0.26) \times 10^{-7}$, where the first uncertainty is...
A complete set of optimized CP-averaged angular observables in the rare flavor-changing neutral-current decay $B^0 \rightarrow K^*(892)^0 \mu^+ \mu^-$, with $K^*(892)^0 \rightarrow K^+ \pi^-$, is measured using the full Run 2 dataset of proton-proton collisions at $\sqrt{s} = 13 \ \rm{TeV}$ collected by the CMS detector, corresponding to an integrated luminosity of 140 $\rm{fb}^{-1}$. The...
By analyzing $e^+e^-$ collision data taken at center-of-mass energies $\sqrt{s}$ between 4.600 and 4.699 GeV with the BESIII detector at the BEPCII collider, corresponding to an integrated luminosity of $\rm 4.5~fb^{-1}$, we study the hadronic decays $\Lambda_{c}^{+} \rightarrow \Sigma^{+} \eta$ and $\Lambda_{c}^{+} \rightarrow \Sigma^{+} \eta^{\prime}$ using the single-tag method. The...
The Compressed Baryonic Matter (CBM) experiment at FAIR, with its unprecedented rate capabilities and precision vertexing, offers a unique opportunity to advance charm physics through its dedicated proton beam program. A central objective of this program is to investigate the production and propagation of charm hadrons in cold nuclear matter. Such studies will provide indispensable baseline...
质子作为最稳定的强子，对其内部结构和性质等问题的研究一直是粒子物理与核物理领域的前沿热点方向。质子内部性质最基本的内容可以用质子的电磁、弱力和引力相互作用的形状因子描述。直到目前，质子引力形状因子还没有被很好的确定下来。一个主要的原因在于，引力作用非常弱，远远小于电磁和弱相互作用力，超出了实验直接测量的极限。在本研究中，我们采用间接的策略，以矢量介子作为探针，通过研究矢量介子与质子的弹性散射过程(Vp→Vp)来揭示质子的内部结构特性。在低能标尺度下，Vp→Vp过程则可以借助矢量介子主导模型，与矢量介子近阈值处的光致产生过程(γp→Vp)建立联系。基于光致产生过程丰富的截面实验数据，我们分别从轻、重矢量介子的光致产生过程中提取了引力形状因子，得到了质子内部结构的信息，包括质量分布，自旋分布和力学性质，这包含了来自夸克的贡献和胶子贡献的完备信息。与格点QCD方法相比，我们的研究方法无需依...
