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

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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 languageEnglish (US)
Article number034511
JournalPhysical Review D
Volume97
Issue number3
DOIs
StatePublished - Feb 1 2018

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phenomenology
form factors
pions
quantum chromodynamics
decay
domain wall
fermions
spacing
asymmetry
tensors
continuums
physics
expansion

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

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title = "Λ c → N form factors from lattice QCD and phenomenology of Λ c → n ℓ + ν ℓ and Λ c → p μ + μ - decays",
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.",
author = "Stefan Meinel",
year = "2018",
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doi = "10.1103/PhysRevD.97.034511",
language = "English (US)",
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journal = "Physical Review D",
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publisher = "American Physical Society",
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AU - Meinel, Stefan

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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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