${\mathrm{\Lambda }}_c\to N$ form factors from lattice QCD and phenomenology of ${\mathrm{\Lambda }}_c\to n{\ell }^{+}{\nu }_{\ell }$ and ${\mathrm{\Lambda }}_c\to p{\mu }^{+}{\mu }^{₋}$ decays

Journal Article · 23 February 2018 · Physical Review D

DOI: https://doi.org/10.1103/PhysRevD.97.034511 · OSTI ID:1422454

Meinel, Stefan ^[1]

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1. Univ. of Arizona, Tucson, AZ (United States); Brookhaven National Lab. (BNL), Upton, NY (United States). RIKEN Research Center

We report on a lattice QCD determination of the Λ_c→N vector, axial vector, and tensor form factors. Here, the calculation was performed with 2+1 flavors of domain wall fermions at lattice spacings of a≈0.11 and 0.085 fm and pion masses in the range 230 MeV≲ m_π ≲ 350 MeV. The form factors are extrapolated to the continuum limit and the physical pion mass using modified z expansions. The rates of the charged-current decays Λ_c→ne+ν_e and Λ_c→nμ+ν_μ are predicted to be (0.405 ± 0.016_stat ± 0.020_syst)|V_cd|²ps^₋1 and (0.396 ± 0.016_stat ± 0.020_syst)|V_cd|²ps^₋1, respectively. The phenomenology of the rare charm decay Λ_c→pμ+μ₋ is also studied. The differential branching fraction, the fraction of longitudinally polarized dimuons, and the forward-backward asymmetry are calculated in the Standard Model and in an illustrative new-physics scenario.

• Research Organization: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
• Sponsoring Organization: USDOE Office of Science (SC); National Science Foundation (NSF); USDOE
• Grant/Contract Number: AC02-05CH11231
• OSTI ID: 1422454
• Alternate ID(s): OSTI ID: 1544321
• Journal Information: Physical Review D, Vol. 97, Issue 3; ISSN 2470-0010
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English