### Abstract

A lattice QCD determination of the Λc→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≈0.11 and 0.085 fm and pion masses in the range 230 MeVmπ 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 Λc→ne+νe and Λc→nμ+νμ are predicted to be (0.405±0.016stat±0.020syst)|Vcd|2 ps-1 and (0.396±0.016stat±0.020syst)|Vcd|2 ps-1, respectively. The phenomenology of the rare charm decay Λc→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.

Original language | English (US) |
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Article number | 034511 |

Journal | Physical Review D |

Volume | 97 |

Issue number | 3 |

DOIs | |

State | Published - Feb 1 2018 |

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### ASJC Scopus subject areas

- Physics and Astronomy (miscellaneous)

### Cite this

**Λ c → N form factors from lattice QCD and phenomenology of Λ c → n ℓ + ν ℓ and Λ c → p μ + μ - decays.** / Meinel, Stefan.

Research output: Contribution to journal › Article

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TY - JOUR

T1 - Λ c → N form factors from lattice QCD and phenomenology of Λ c → n ℓ + ν ℓ and Λ c → p μ + μ - decays

AU - Meinel, Stefan

PY - 2018/2/1

Y1 - 2018/2/1

N2 - A lattice QCD determination of the Λc→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≈0.11 and 0.085 fm and pion masses in the range 230 MeVmπ 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 Λc→ne+νe and Λc→nμ+νμ are predicted to be (0.405±0.016stat±0.020syst)|Vcd|2 ps-1 and (0.396±0.016stat±0.020syst)|Vcd|2 ps-1, respectively. The phenomenology of the rare charm decay Λc→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.

AB - A lattice QCD determination of the Λc→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≈0.11 and 0.085 fm and pion masses in the range 230 MeVmπ 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 Λc→ne+νe and Λc→nμ+νμ are predicted to be (0.405±0.016stat±0.020syst)|Vcd|2 ps-1 and (0.396±0.016stat±0.020syst)|Vcd|2 ps-1, respectively. The phenomenology of the rare charm decay Λc→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.

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U2 - 10.1103/PhysRevD.97.034511

DO - 10.1103/PhysRevD.97.034511

M3 - Article

VL - 97

JO - Physical Review D

JF - Physical Review D

SN - 2470-0010

IS - 3

M1 - 034511

ER -