Phenomenology of Λb → Λcτ ν¯τ using lattice QCD calculations

Alakabha Datta, Saeed Kamali, Stefan Meinel, Ahmed Rashed

Research output: Contribution to journalArticlepeer-review

Abstract

In 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 → Λc`ν¯`] 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.

Original languageEnglish (US)
JournalUnknown Journal
StatePublished - Feb 7 2017

ASJC Scopus subject areas

  • General

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