Bs →kν decay from lattice QCD

Fermilab Lattice and MILC Collaborations

Research output: Contribution to journalArticle

Abstract

We use lattice QCD to calculate the form factors f+(q2) and f0(q2) for the semileptonic decay Bs→Kν. Our calculation uses six MILC asqtad 2+1 flavor gauge-field ensembles with three lattice spacings. At the smallest and largest lattice spacing the light-quark sea mass is set to 1/10 the strange-quark mass. At the intermediate lattice spacing, we use four values for the light-quark sea mass ranging from 1/5 to 1/20 of the strange-quark mass. We use the asqtad improved staggered action for the light valence quarks, and the clover action with the Fermilab interpolation for the heavy valence bottom quark. We use SU(2) hard-kaon heavy-meson rooted staggered chiral perturbation theory to take the chiral-continuum limit. A functional z expansion is used to extend the form factors to the full kinematic range. We present predictions for the differential decay rate for both Bs→Kμν and Bs→Kτν. We also present results for the forward-backward asymmetry, the lepton polarization asymmetry, ratios of the scalar and vector form factors for the decays Bs→Kν and Bs→Dsν. Our results, together with future experimental measurements, can be used to determine the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element |Vub|.

Original languageEnglish (US)
Article number034501
JournalPhysical Review D
Volume100
Issue number3
DOIs
StatePublished - Aug 1 2019

Fingerprint

quantum chromodynamics
quarks
decay
form factors
spacing
asymmetry
valence
decay rates
interpolation
leptons
kinematics
mesons
perturbation theory
scalars
continuums
expansion
polarization
matrices
predictions

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Fermilab Lattice and MILC Collaborations (2019). Bs →kν decay from lattice QCD. Physical Review D, 100(3), [034501]. https://doi.org/10.1103/PhysRevD.100.034501

Bs →kν decay from lattice QCD. / Fermilab Lattice and MILC Collaborations.

In: Physical Review D, Vol. 100, No. 3, 034501, 01.08.2019.

Research output: Contribution to journalArticle

Fermilab Lattice and MILC Collaborations 2019, 'Bs →kν decay from lattice QCD', Physical Review D, vol. 100, no. 3, 034501. https://doi.org/10.1103/PhysRevD.100.034501
Fermilab Lattice and MILC Collaborations. Bs →kν decay from lattice QCD. Physical Review D. 2019 Aug 1;100(3). 034501. https://doi.org/10.1103/PhysRevD.100.034501
Fermilab Lattice and MILC Collaborations. / Bs →kν decay from lattice QCD. In: Physical Review D. 2019 ; Vol. 100, No. 3.
@article{f53be6cda1604a97ab6f31af7a85a747,
title = "Bs →kν decay from lattice QCD",
abstract = "We use lattice QCD to calculate the form factors f+(q2) and f0(q2) for the semileptonic decay Bs→Kν. Our calculation uses six MILC asqtad 2+1 flavor gauge-field ensembles with three lattice spacings. At the smallest and largest lattice spacing the light-quark sea mass is set to 1/10 the strange-quark mass. At the intermediate lattice spacing, we use four values for the light-quark sea mass ranging from 1/5 to 1/20 of the strange-quark mass. We use the asqtad improved staggered action for the light valence quarks, and the clover action with the Fermilab interpolation for the heavy valence bottom quark. We use SU(2) hard-kaon heavy-meson rooted staggered chiral perturbation theory to take the chiral-continuum limit. A functional z expansion is used to extend the form factors to the full kinematic range. We present predictions for the differential decay rate for both Bs→Kμν and Bs→Kτν. We also present results for the forward-backward asymmetry, the lepton polarization asymmetry, ratios of the scalar and vector form factors for the decays Bs→Kν and Bs→Dsν. Our results, together with future experimental measurements, can be used to determine the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element |Vub|.",
author = "{Fermilab Lattice and MILC Collaborations} and A. Bazavov and C. Bernard and C. Detar and Daping Du and El-Khadra, {A. X.} and Freeland, {E. D.} and E. G{\'a}miz and Z. Gelzer and Steven Gottlieb and Heller, {U. M.} and Kronfeld, {A. S.} and J. Laiho and Yuzhi Liu and Mackenzie, {P. B.} and Y. Meurice and Neil, {E. T.} and Simone, {J. N.} and R. Sugar and D. Toussaint and {Van De Water}, {R. S.} and Ran Zhou",
year = "2019",
month = "8",
day = "1",
doi = "10.1103/PhysRevD.100.034501",
language = "English (US)",
volume = "100",
journal = "Physical Review D",
issn = "2470-0010",
publisher = "American Physical Society",
number = "3",

}

TY - JOUR

T1 - Bs →kν decay from lattice QCD

AU - Fermilab Lattice and MILC Collaborations

AU - Bazavov, A.

AU - Bernard, C.

AU - Detar, C.

AU - Du, Daping

AU - El-Khadra, A. X.

AU - Freeland, E. D.

AU - Gámiz, E.

AU - Gelzer, Z.

AU - Gottlieb, Steven

AU - Heller, U. M.

AU - Kronfeld, A. S.

AU - Laiho, J.

AU - Liu, Yuzhi

AU - Mackenzie, P. B.

AU - Meurice, Y.

AU - Neil, E. T.

AU - Simone, J. N.

AU - Sugar, R.

AU - Toussaint, D.

AU - Van De Water, R. S.

AU - Zhou, Ran

PY - 2019/8/1

Y1 - 2019/8/1

N2 - We use lattice QCD to calculate the form factors f+(q2) and f0(q2) for the semileptonic decay Bs→Kν. Our calculation uses six MILC asqtad 2+1 flavor gauge-field ensembles with three lattice spacings. At the smallest and largest lattice spacing the light-quark sea mass is set to 1/10 the strange-quark mass. At the intermediate lattice spacing, we use four values for the light-quark sea mass ranging from 1/5 to 1/20 of the strange-quark mass. We use the asqtad improved staggered action for the light valence quarks, and the clover action with the Fermilab interpolation for the heavy valence bottom quark. We use SU(2) hard-kaon heavy-meson rooted staggered chiral perturbation theory to take the chiral-continuum limit. A functional z expansion is used to extend the form factors to the full kinematic range. We present predictions for the differential decay rate for both Bs→Kμν and Bs→Kτν. We also present results for the forward-backward asymmetry, the lepton polarization asymmetry, ratios of the scalar and vector form factors for the decays Bs→Kν and Bs→Dsν. Our results, together with future experimental measurements, can be used to determine the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element |Vub|.

AB - We use lattice QCD to calculate the form factors f+(q2) and f0(q2) for the semileptonic decay Bs→Kν. Our calculation uses six MILC asqtad 2+1 flavor gauge-field ensembles with three lattice spacings. At the smallest and largest lattice spacing the light-quark sea mass is set to 1/10 the strange-quark mass. At the intermediate lattice spacing, we use four values for the light-quark sea mass ranging from 1/5 to 1/20 of the strange-quark mass. We use the asqtad improved staggered action for the light valence quarks, and the clover action with the Fermilab interpolation for the heavy valence bottom quark. We use SU(2) hard-kaon heavy-meson rooted staggered chiral perturbation theory to take the chiral-continuum limit. A functional z expansion is used to extend the form factors to the full kinematic range. We present predictions for the differential decay rate for both Bs→Kμν and Bs→Kτν. We also present results for the forward-backward asymmetry, the lepton polarization asymmetry, ratios of the scalar and vector form factors for the decays Bs→Kν and Bs→Dsν. Our results, together with future experimental measurements, can be used to determine the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element |Vub|.

UR - http://www.scopus.com/inward/record.url?scp=85072617014&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85072617014&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.100.034501

DO - 10.1103/PhysRevD.100.034501

M3 - Article

AN - SCOPUS:85072617014

VL - 100

JO - Physical Review D

JF - Physical Review D

SN - 2470-0010

IS - 3

M1 - 034501

ER -