Λ[subscript b]→Λℓ[superscript +]ℓ[superscript -] form factors and differential branching fraction from lattice QCD
Name
Detmold-2013-form factors and differential branching fraction from lattice QCD.pdf
Size
2.09 MB
Format
Adobe PDF
Checksum (MD5)
4cae3f825539a48716988da6a0adec8b
Author(s)
Detmold, William
Lin, C.-J. David
Meinel, Stefan
Wingate, Matthew
Date Issued
April 2013
Journal
Physical Review D
Publisher
American Physical Society
Citation
Detmold, William, C.-J. David Lin, Stefan Meinel, and Matthew Wingate. Λ_{b}→Λℓ^{+}ℓ^{-} Form Factors and Differential Branching Fraction from Lattice QCD. Physical Review D 87, no. 7 (April 2013). © 2013 American Physical Society
Version
Final published version
Abstract
We present the first lattice QCD determination of the Λ[subscript b→]Λ transition form factors that govern the rare baryonic decays Λ[subscript b→]Λℓ[superscript +]ℓ[superscript -] at leading order in heavy-quark effective theory. Our calculations are performed with 2+1 flavors of domain-wall fermions, at two lattice spacings and with pion masses down to 227 MeV. Three-point functions with a wide range of source-sink separations are used to extract the ground-state contributions. The form factors are extrapolated to the physical values of the light-quark masses and to the continuum limit. We use our results to calculate the differential branching fractions for Λ[subscript b→]Λℓ[superscript +]ℓ[superscript -] with ℓ=e, μ, τ within the standard model. We find agreement with a recent CDF measurement of the Λ[subscript b→]Λμ[superscript +]μ[superscript -] differential branching fraction.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/PhysRevD.87.074502
