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Title: Λ c N form factors from lattice QCD and phenomenology of Λ c n + ν and Λ c p μ + μ decays

Abstract

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.

Authors:
 [1]
  1. Univ. of Arizona, Tucson, AZ (United States); Brookhaven National Lab. (BNL), Upton, NY (United States). RIKEN Research Center
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Foundation (NSF)
OSTI Identifier:
1422454
Alternate Identifier(s):
OSTI ID: 1544321
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 97; Journal Issue: 3; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Meinel, Stefan. Λc→N form factors from lattice QCD and phenomenology of Λc→nℓ+νℓ and Λc→pμ+μ₋ decays. United States: N. p., 2018. Web. doi:10.1103/PhysRevD.97.034511.
Meinel, Stefan. Λc→N form factors from lattice QCD and phenomenology of Λc→nℓ+νℓ and Λc→pμ+μ₋ decays. United States. doi:10.1103/PhysRevD.97.034511.
Meinel, Stefan. Fri . "Λc→N form factors from lattice QCD and phenomenology of Λc→nℓ+νℓ and Λc→pμ+μ₋ decays". United States. doi:10.1103/PhysRevD.97.034511.
@article{osti_1422454,
title = {Λc→N form factors from lattice QCD and phenomenology of Λc→nℓ+νℓ and Λc→pμ+μ₋ decays},
author = {Meinel, Stefan},
abstractNote = {We report on a lattice QCD determination of the Λc→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≲ mπ ≲ 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|2ps₋1 and (0.396 ± 0.016stat ± 0.020syst)|Vcd|2ps₋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.},
doi = {10.1103/PhysRevD.97.034511},
journal = {Physical Review D},
number = 3,
volume = 97,
place = {United States},
year = {2018},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevD.97.034511

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Cited by: 4 works
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Figures / Tables:

TABLE I TABLE I: Parameters of the lattice gauge field ensembles [21] and light quark propagators. The C14/C24 and F23 data sets are based on the same gauge field ensembles as the C54 and F43 data sets, respectively, and differ only in the valence quark mass used for the propagators. The latticemore » spacing values given here were determined using the $Υ$(2$S$)−$Υ$(1$S$) splitting in Ref. [23].« less

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