Model-independent bounds on R(J/ψ)

Thomas D. Cohen, Henry Lamm, Richard Lebed

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

We present a model-independent bound on R(J/ψ)≡ℬℛ(BC+→J/ψτ+ντ)/ℬℛ(BC+→J/ψµ+νµ). This bound is constructed by constraining the form factors through a combination of dispersive relations, heavy-quark relations at zero-recoil, and the limited existing determinations from lattice QCD. The resulting 95% confidence-level bound, 0.20 ≤ R(J/ψ) ≤ 0.39, agrees with the recent LHCb result at 1.3σ, and rules out some previously suggested model form factors.

Original languageEnglish (US)
Article number168
JournalJournal of High Energy Physics
Volume2018
Issue number9
DOIs
StatePublished - Sep 1 2018

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Keywords

  • Heavy Quark Physics
  • Lattice QCD
  • Quark Masses and SM Parameters

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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