Λ c → Λ * ( 1520 ) form factors from lattice QCD and improved analysis of the Λ b → Λ * ( 1520 ) and Λ b → Λ c * ( 2595 , 2625 ) form factors

Meinel, Stefan; Rendon, Gumaro

doi:10.1103/PhysRevD.105.054511

Title: $Λ_{c} \to Λ^{} (1520)$ form factors from lattice QCD and improved analysis of the $Λ_{b} \to Λ^{} (1520)$ and $Λ_{b} \to Λ_{c}^{*} (2595, 2625)$ form factors

Journal Article · Fri Mar 25 00:00:00 EDT 2022 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.105.054511· OSTI ID:1858270

;

We present the first lattice-QCD calculation of the form factors governing the charm-baryon semileptonic decays Λ_c→Λ*(1520)ℓ⁺ν_ℓ. As in our previous calculation of the Λ_b→Λ*(1520) form factors, we work in the Λ*(1520) rest frame, but here we use four different heavy-baryon momenta instead of just two. Because of the lower mass of the Λ_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 Λ_b→Λ*(1520) and Λ_b→Λ*_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.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Office of Science (SC), Nuclear Physics (NP); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); National Science Foundation (NSF)

Grant/Contract Number:: SC0009913; SC0012704; AC02-05CH1123; AC02-05CH11231; ACI-1548562

OSTI ID:: 1858270

Alternate ID(s):: OSTI ID: 1871821

Report Number(s):: BNL-223047-2022-JAAM; PRVDAQ; 054511

Journal Information:: Physical Review D, Journal Name: Physical Review D Vol. 105 Journal Issue: 5; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Λ c → Λ * ( 1520 ) form factors from lattice QCD and improved analysis of the Λ b → Λ * ( 1520 ) and Λ b → Λ c * ( 2595 , 2625 ) form factors

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Title: $Λ_{c} \to Λ^{} (1520)$ form factors from lattice QCD and improved analysis of the $Λ_{b} \to Λ^{} (1520)$ and $Λ_{b} \to Λ_{c}^{*} (2595, 2625)$ form factors