Λ[subscript b] → Λℓ[superscript +]ℓ[superscript −] form Factors, Differential Branching Fraction, and Angular Observables from Lattice QCD with Relativistic b quarks
Name
PhysRevD.93.074501.pdf
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1.27 MB
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Adobe PDF
Checksum (MD5)
a96ebc141be1cdc0f239254bfb00561b
Author(s)
Detmold, William
Meinel, Stefan
Date Issued
April 2016
Journal
Physical Review D
Publisher
American Physical Society
Citation
Detmold, William, and Stefan Meinel. “Λ[subscript b] → Λℓ[superscript +]ℓ[superscript −] form Factors, Differential Branching Fraction, and Angular Observables from Lattice QCD with Relativistic b quarks.” Phys. Rev. D 93, no. 7 (April 1, 2016). © 2016 American Physical Society
Version
Final published version
Abstract
Using (2 + 1)-flavor lattice QCD, we compute the 10 form factors describing the Λ[subscript b] → Λ matrix elements of the b → s vector, axial vector, and tensor currents. The calculation is based on gauge field ensembles generated by the RBC and UKQCD Collaborations with a domain-wall action for the u, d, and s quarks and the Iwasaki gauge action. The b quark is implemented using an anisotropic clover action, tuned nonperturbatively to the physical point, and the currents are renormalized with a mostly nonperturbative method. We perform simultaneous chiral, continuum, and kinematic extrapolations of the form factors through modified z expansions. Using our form factor results, we obtain precise predictions for the Λ[subscript b] → Λ(→ p[superscript +]π[superscript -])μ[superscript +]μ[superscript -] differential branching fraction and angular observables in the Standard Model.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.93.074501
