Phenomenology of Λ b→ Λ c τ using lattice QCD calculations

Alakabha Datta, Saeed Kamali, Stefan Meinel, Ahmed Rashed

Research output: Contribution to journalArticlepeer-review

77 Scopus citations


In a recent paper we studied the effect of new-physics operators with different Lorentz structures on the semileptonic Λ b→ Λ c τ decay. This decay is of interest in light of the R(D(*)) puzzle in the semileptonic B¯ → D(∗ ) 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→Λc]/ℬ[Λb→Λc] can strongly constrain the NP parameters of models discussed for the R(D(*)) puzzle. We use form factors from lattice QCD to calculate all Λ b→ Λ c 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)
Article number131
JournalJournal of High Energy Physics
Issue number8
StatePublished - Aug 1 2017


  • Beyond Standard Model
  • Heavy Quark Physics
  • Lattice QCD

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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