New Predictions for Λ b → Λ c Semileptonic Decays and Tests of Heavy Quark Symmetry

Bernlochner, Florian U.; Ligeti, Zoltan; Robinson, Dean J.; Sutcliffe, William L.

doi:10.1103/PhysRevLett.121.202001

Title: New Predictions for $Λ_{b} \to Λ_{c}$ Semileptonic Decays and Tests of Heavy Quark Symmetry

Journal Article · Thu Nov 15 00:00:00 EST 2018 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.121.202001· OSTI ID:1482280

Bernlochner, Florian U.; Ligeti, Zoltan; Robinson, Dean J.; Sutcliffe, William L.

The heavy quark effective theory makes model independent predictions for semileptonic Λ_b → Λ_c decays in terms of a small set of parameters. No subleading Isgur-Wise function occurs at order Λ_QCD/$$ {m}_{c,b,}$$ and only two subsubleading functions enter at order Λ$$^2_{QCD}$$/m$$^2_c$$ These features allow us to fit the form factors and decay rates calculated up to order Λ$$^2_{QCD}$$/m$$^2_c$$ to LHCb data and lattice QCD calculations. We derive a significantly more precise standard model prediction for the ratio $$\mathscr{B}$$ Λ_b → Λ_c$$\tau$$ $$\overline\nu$$)/$$\mathscr{B}$$ Λ_b → Λ_c$$\mu\overline\nu$$) than prior results, and find the expansion in Λ_QCD/$$ {m}_{c}$$ well behaved, addressing a long-standing question. Our results allow more precise and reliable calculations of Λ_b → Λ_c$$\ell\overline\nu$$ rates, and are systematically improvable with better data on the μ (or e) modes.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF); German Research Foundation (DFG)

Grant/Contract Number:: AC02-05CH11231; PHY-1720252; PHY-1607611

OSTI ID:: 1482280

Alternate ID(s):: OSTI ID: 1631598

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Vol. 121 Journal Issue: 20; ISSN 0031-9007

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 35 works

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Investigation of effects of new physics in $Λ_{b} \to Λ_{c} τ {\bar{ν}}_{τ}$ decay Mu, Xiao-Long; Li, Ying; Zou, Zhi-Tian Physical Review D, Vol. 100, Issue 11 https://doi.org/10.1103/physrevd.100.113004	journal	December 2019
Further tests of lepton flavor universality from the charged lepton energy distribution in $b \to c$ semileptonic decays: The case of $Λ_{b} \to Λ_{c} ℓ {\bar{ν}}_{ℓ}$ Penalva, Neus; Hernández, Eliecer; Nieves, Juan Physical Review D, Vol. 100, Issue 11 https://doi.org/10.1103/physrevd.100.113007	journal	December 2019