Λ(c) → N form factors from lattice QCD and phenomenology of Λ(c) → nℓ(+) νℓ and Λ(c) → pμ(+) μ(−) decays

• Main Author: Meinel, Stefan
• Other Authors: Univ Arizona, Dept Phys
• Language: en
• Published: AMER PHYSICAL SOC 2018
• Online Access: http://hdl.handle.net/10150/627162; http://arizona.openrepository.com/arizona/handle/10150/627162

A lattice QCD determination of the Lambda(c) -> N vector, axial vector, and tensor form factors is reported. The calculation was performed with 2 + 1 flavors of domain wall fermions at lattice spacings of a approximate to 0.11 and 0.085 fm and pion masses in the range 230 MeV less than or similar to m(pi) less than or similar to 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 Lambda(c) -> ne(+)nu(e) and Lambda(c) -> n mu(+) nu(mu) are predicted to be (0.405 +/- 0.016(stat) +/- 0.020(syst))vertical bar V-cd vertical bar(2) ps(-1) and (0.396 +/- 0.016(stat) +/- 0.020(syst))vertical bar V-cd vertical bar(2) ps(-1), respectively. The phenomenology of the rare charm decay Lambda(c) -> p mu(+)mu(-) 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.