First lattice QCD calculation of semileptonic decays of charmed-strange baryons Ξc

While the standard model is the most successful theory to describe all the interactions and constituents of elementary particle physics, it has been constantly scrutinized for over four decades. Weak decays of charm quarks can be used to measure the coupling strength between quarks in different families and serve as an ideal probe for CP violation. As the lowest charm-strange baryons with three different flavors, Xi(c) baryons (composed of csu or csd) have been extensively studied in experiments. In this study, we use state-of-the-art lattice QCD techniques to generate 2+1 clover fermion ensembles with two lattice spacings, a = (0.108, 0.080 fm). Then, we present the first ab-initio lattice QCD calculation of the Xi(c) -> Xi form factors. Our theoretical results for the Xi -> Xi l(+)v(l) decay widths are consistent with and approximately two times more precise than the latest measurements by the ALICE and Belle collaborations. Based on the latest experimental measurements, we independently obtain the quark-mixing matrix element vertical bar V-cs vertical bar, which is in good agreement with results from other theoretical approaches.

Automated summary

In this study, the properties of Xi(c) baryons are investigated using state-of-the-art lattice QCD techniques, and the obtained results are consistent with experimental evidence and more precise than previous measurements.