Using Λb → Λμ+μ- data within a Bayesian analysis of | Δb |= | Δs |=1 decays

Stefan Meinel, Danny Van Dyk

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

We study the impact of including the baryonic decay Λb→Λ(→pπ-)μ+μ- in a Bayesian analysis of |ΔB|=|ΔS|=1 transitions. We perform fits of the Wilson coefficients C9, C9′, C10 and C10′, in addition to the relevant nuisance parameters. Our analysis combines data for the differential branching fraction and three angular observables of Λb→Λ(→pπ-)μ+μ- with data for the branching ratios of Bs→μ+μ- and inclusive b→s+ - decays. Newly available precise lattice QCD results for the full set of Λb→Λ form factors are used to evaluate the observables of the baryonic decay. Our fits prefer shifts to C9 that are opposite in sign compared to those found in global fits of only mesonic decays, and the posterior odds show no evidence of physics beyond the Standard Model. We investigate a possible hadronic origin of the observed tensions between theory and experiment.

Original languageEnglish (US)
Article number013007
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume94
Issue number1
DOIs
StatePublished - Jul 13 2016

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decay
form factors
quantum chromodynamics
physics
shift
coefficients

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Using Λb → Λμ+μ- data within a Bayesian analysis of | Δb |= | Δs |=1 decays. / Meinel, Stefan; Van Dyk, Danny.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 94, No. 1, 013007, 13.07.2016.

Research output: Contribution to journalArticle

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