AffiliationUniv Arizona, Dept Phys & Astron
MetadataShow full item record
CitationDatta, A., Kamali, S., Meinel, S. et al. J. High Energ. Phys. (2017) 2017: 131. https://doi.org/10.1007/JHEP08(2017)131
JournalJournal of High Energy Physics
RightsOpen Access, © The Authors 2017.
Collection InformationThis 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 firstname.lastname@example.org.
AbstractIn a recent paper we studied the effect of new-physics operators with different Lorentz structures on the semileptonic Λb → Λcτν¯τ decay. This decay is of interest in light of the R(D(∗)) puzzle in the semileptonic B¯ → D(∗)τν¯τ decays. In this work we add tensor operators to extend our previous results and consider both model-independent new physics (NP) and specific classes of models proposed to address the R(D(∗)) puzzle. We show that a measurement of R(Λc) = B[Λb → Λcτν¯τ ]/B[Λb → Λcℓν¯ℓ] can strongly constrain the NP parameters of models discussed for the R(D(∗)) puzzle. We use form factors from lattice QCD to calculate all Λb → Λcτν¯τ observables. The Λb → Λc tensor form factors had not previously been determined in lattice QCD, and we present new lattice results for these form factors here.
NoteOpen access journal
VersionFinal published version
SponsorsNational Science Foundation [PHY-1414345, OCI-1053575]; RHIC Physics Fellow Program of the RIKEN BNL Research Center; U.S. Department of Energy [DE-AC02-05CH11231]