Show simple item record

dc.contributor.authorMeinel, Stefan
dc.date.accessioned2017-04-05T21:00:41Z
dc.date.available2017-04-05T21:00:41Z
dc.date.issued2017-02-21
dc.identifier.citationΛc → Λl + νl Form Factors and Decay Rates from Lattice QCD with Physical Quark Masses 2017, 118 (8) Physical Review Lettersen
dc.identifier.issn0031-9007
dc.identifier.issn1079-7114
dc.identifier.pmid28282163
dc.identifier.doi10.1103/PhysRevLett.118.082001
dc.identifier.urihttp://hdl.handle.net/10150/623030
dc.description.abstractThe first lattice QCD calculation of the form factors governing Lambda(c) -> Lambda l(+)nu(l) decays is reported. The calculation was performed with two different lattice spacings and includes one ensemble with a pion mass of 139(2) MeV. The resulting predictions for the Lambda(c) -> Lambda e(+)nu(e) and Lambda(c) -> Lambda mu(+)nu(mu) decay rates divided by vertical bar V-cs vertical bar(2) are 0.2007(71)(74) and 0.1945(69)(72) p(s-1), respectively, where the two uncertainties are statistical and systematic. Taking the Cabibbo-Kobayashi-Maskawa (CKM) matrix element vertical bar V-cs vertical bar from a global fit and the Lambda(c) lifetime from experiments, this translates to branching fractions of B(Lambda(c) -> Lambda e(e)(+nu)) = 0.0380(19)(LQCD)(11)(tau Lambda c) and B(Lambda(c) -> Lambda mu(+)nu(mu)) 0.0369(19)(LQCD)(11)(tau Lambda c). These results are consistent with, and two times more precise than, the measurements performed recently by the BESIII Collaboration. Using instead the measured branching fractions together with the lattice calculation to determine the CKM matrix element gives vertical bar V-cs vertical bar = 0.949(24)(LQCD)(14)(tau)Lambda c (49)(B).
dc.description.sponsorshipNational Science Foundation [PHY-1520996, ACI-1053575]; RHIC Physics Fellow Program of the RIKEN BNL Research Center; National Energy Research Scientific Computing Center; U.S. Department of Energy [DE-AC02-05CH11231]en
dc.language.isoenen
dc.publisherAMER PHYSICAL SOCen
dc.relation.urlhttp://link.aps.org/doi/10.1103/PhysRevLett.118.082001en
dc.rights© 2017 American Physical Society.en
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.titleLambda(c) -> Lambda l(+)nu(l) Form Factors and Decay Rates from Lattice QCD with Physical Quark Massesen
dc.typeArticleen
dc.contributor.departmentUniv Arizona, Dept Physen
dc.identifier.journalPhysical Review Lettersen
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en
dc.eprint.versionFinal published versionen
refterms.dateFOA2018-06-23T04:02:20Z
html.description.abstractThe first lattice QCD calculation of the form factors governing Lambda(c) -> Lambda l(+)nu(l) decays is reported. The calculation was performed with two different lattice spacings and includes one ensemble with a pion mass of 139(2) MeV. The resulting predictions for the Lambda(c) -> Lambda e(+)nu(e) and Lambda(c) -> Lambda mu(+)nu(mu) decay rates divided by vertical bar V-cs vertical bar(2) are 0.2007(71)(74) and 0.1945(69)(72) p(s-1), respectively, where the two uncertainties are statistical and systematic. Taking the Cabibbo-Kobayashi-Maskawa (CKM) matrix element vertical bar V-cs vertical bar from a global fit and the Lambda(c) lifetime from experiments, this translates to branching fractions of B(Lambda(c) -> Lambda e(e)(+nu)) = 0.0380(19)(LQCD)(11)(tau Lambda c) and B(Lambda(c) -> Lambda mu(+)nu(mu)) 0.0369(19)(LQCD)(11)(tau Lambda c). These results are consistent with, and two times more precise than, the measurements performed recently by the BESIII Collaboration. Using instead the measured branching fractions together with the lattice calculation to determine the CKM matrix element gives vertical bar V-cs vertical bar = 0.949(24)(LQCD)(14)(tau)Lambda c (49)(B).


Files in this item

Thumbnail
Name:
PhysRevLett.118.082001.pdf
Size:
370.3Kb
Format:
PDF
Description:
Final Published Version

This item appears in the following Collection(s)

Show simple item record