Λc→Λ*(1520) form factors from lattice QCD and improved analysis of the Λb→Λ*(1520) and Λb→Λc*(2595,2625) form factors
Year: 2022
Type: article
Abstract: We present the first lattice-QCD calculation of the form factors governing the charm-baryon semileptonic decays ${\mathrm{\ensuremath{\Lambda}}}_{c}\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Lambda}}}^{*}(1520){\ensuremath{\ell}}^{+}{\ensuremath{\nu}}_{\ensuremath{\ell}}$. As in our previous calculation of the ${\mathrm{\ensuremath{\Lambda}}}_{b}\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Lambda}}}^{*}(1520)$ form factors, we work in the ${\mathrm{\ensuremath{\Lambda}}}^{*}(1520)$ rest frame, but here we use four different heavy-baryon momenta instead of just two. Because of the lower mass of the ${\mathrm{\ensuremath{\Lambda}}}_{c}$, the moderately sized momenta used here are sufficient to determine the form factors in the full kinematic range of the semileptonic decay. We also update the analysis of our lattice results for the ${\mathrm{\ensuremath{\Lambda}}}_{b}\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Lambda}}}^{*}(1520)$ and ${\mathrm{\ensuremath{\Lambda}}}_{b}\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Lambda}}}_{c}^{*}(2595,2625)$ form factors by imposing exact relations among the different form factors at zero recoil that follow from rotational symmetry. Imposing these relations ensures the correct behavior of the angular observables near the endpoint.
Authors: Stefan Meinel, Gumaro Rendon
Institutions: University of Arizona, Brookhaven National Laboratory
Language: Latvian
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Awards: G1039895795, G111697547, G241279073, G272672434, G3204085874, G3226045097, G357145406, XSEDE 2.0: Integrating, Enabling and Enhancing National Cyberinfrastructure with Expanding Community Involvement, G3850097093, G4354484304, G4382344593, G4392917094, G4972998915, G498139845, G5590740066, G5633341255, G5765906131, G6733788163, G6806689448, G7406122311, G7463374569, G7861570460, G872144517, G8866302460, UNIVERSITY OF ARIZONA HIGH ENERGY PHYSICS PROGRAM, G969889393
OpenAlex ID: W4221089872