High Energy Physics - Phenomenology
[Submitted on 8 Feb 2017 (v1), last revised 15 Sep 2017 (this version, v2)]
Title:Phenomenology of $Λ_b \to Λ_c τ\barν_τ$ using lattice QCD calculations
View PDFAbstract:In a recent paper we studied the effect of new-physics operators with different Lorentz structures on the semileptonic $\Lambda_b \to \Lambda_c \tau \bar{\nu}_{\tau}$ decay. This decay is of interest in light of the $R({D^{(*)}})$ puzzle in the semileptonic $\bar{B} \to D^{(*)} \tau {\bar\nu}_\tau$ 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 $R(\Lambda_c) = {\cal B}[\Lambda_b \to \Lambda_c \tau \bar{\nu}_{\tau}] / {\cal B}[\Lambda_b \to \Lambda_c \ell \bar{\nu}_{\ell}]$ can strongly constrain the NP parameters of models discussed for the $R({D^{(*)}})$ puzzle. We use form factors from lattice QCD to calculate all $\Lambda_b \to \Lambda_c \tau \bar{\nu}_{\tau}$ observables. The $\Lambda_b \to \Lambda_c$ tensor form factors had not previously been determined in lattice QCD, and we present new lattice results for these form factors here.
Submission history
From: Ahmed Rashed Dr [view email][v1] Wed, 8 Feb 2017 01:14:23 UTC (5,781 KB)
[v2] Fri, 15 Sep 2017 19:42:43 UTC (5,507 KB)
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