First lattice QCD calculation of semileptonic decays of charmed-strange baryons Ξ _c *

Abstract

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, baryons (composed of or ) 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, . Then, we present the first ab-initio lattice QCD calculation of the form factors. Our theoretical results for the 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 , which is in good agreement with results from other theoretical approaches.

A global analysis of charmless two body hadronic decays for anti-triplet charmed baryons

“…The use of perturbative calculations is at the boundary of applicability. It is believed that lattice QCD will ultimately provide reliable theoretical results [15][16][17]. But it is still far from reaching that goal.…”

Study of the Semileptonic Decay $Λ_c^+\rightarrow Λe^+ν_e$

“…The comparisons of differential decay rate and form factors between experimental measurements and LQCD predictions presented in this work provide important inputs in understanding the SL decays of charmed baryons. Our results will also help calibrate the calculation of SL decays of other charmed baryons [42,43] as well as the Λ b [17-19, 24, 44-47].…”

Quark flavor physics with lattice QCD

“…At this conference, Callum Farrell presented preliminary lattice-QCD results for another charmbaryon semileptonic decay, Ξ 𝑐 → Ξℓ + 𝜈 [126]. The calculation points toward a branching fraction in the Standard Model that is substantially higher than the current experimental results, and also higher than predicted by a previous lattice calculation [127]. Davide Giusti presented a lattice calculation of the structure-dependent form factors in the radiative leptonic decays 𝐷 𝑠 → ℓ𝜈𝛾 [128,129].…”