Model-independent bounds on R(J/ψ)

Abstract We present a model-independent bound on RJ/ψ≡ℬℛBC+→J/ψτ+ντ/ℬℛBC+→J/ψµ+νµ $$ R\left(J/\psi \right)\equiv \mathrm{\mathcal{B}}\mathrm{\mathcal{R}}\left({B}_C^{+}\to J/\psi {\tau}^{+}{\nu}_{\tau}\right)/\mathrm{\mathcal{B}}\mathrm{\mathcal{R}}\left({B}_C^{+}\to J/\psi {\mu}^{+}{\nu}_{\mu}\righ...

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Main Authors: Thomas D. Cohen, Henry Lamm, Richard F. Lebed
Format: Article
Language:English
Published: SpringerOpen 2018-09-01
Series:Journal of High Energy Physics
Subjects:
Online Access:http://link.springer.com/article/10.1007/JHEP09(2018)168
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author Thomas D. Cohen
Henry Lamm
Richard F. Lebed
author_facet Thomas D. Cohen
Henry Lamm
Richard F. Lebed
author_sort Thomas D. Cohen
collection DOAJ
description Abstract We present a model-independent bound on RJ/ψ≡ℬℛBC+→J/ψτ+ντ/ℬℛBC+→J/ψµ+νµ $$ R\left(J/\psi \right)\equiv \mathrm{\mathcal{B}}\mathrm{\mathcal{R}}\left({B}_C^{+}\to J/\psi {\tau}^{+}{\nu}_{\tau}\right)/\mathrm{\mathcal{B}}\mathrm{\mathcal{R}}\left({B}_C^{+}\to J/\psi {\mu}^{+}{\nu}_{\mu}\right) $$. 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.
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spelling doaj.art-c99ef194e4704a128792aa451053dcfe2022-12-22T01:03:01ZengSpringerOpenJournal of High Energy Physics1029-84792018-09-012018911910.1007/JHEP09(2018)168Model-independent bounds on R(J/ψ)Thomas D. Cohen0Henry Lamm1Richard F. Lebed2Department of Physics, University of MarylandDepartment of Physics, University of MarylandDepartment of Physics, Arizona State UniversityAbstract We present a model-independent bound on RJ/ψ≡ℬℛBC+→J/ψτ+ντ/ℬℛBC+→J/ψµ+νµ $$ R\left(J/\psi \right)\equiv \mathrm{\mathcal{B}}\mathrm{\mathcal{R}}\left({B}_C^{+}\to J/\psi {\tau}^{+}{\nu}_{\tau}\right)/\mathrm{\mathcal{B}}\mathrm{\mathcal{R}}\left({B}_C^{+}\to J/\psi {\mu}^{+}{\nu}_{\mu}\right) $$. 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.http://link.springer.com/article/10.1007/JHEP09(2018)168Heavy Quark PhysicsQuark Masses and SM ParametersLattice QCD
spellingShingle Thomas D. Cohen
Henry Lamm
Richard F. Lebed
Model-independent bounds on R(J/ψ)
Journal of High Energy Physics
Heavy Quark Physics
Quark Masses and SM Parameters
Lattice QCD
title Model-independent bounds on R(J/ψ)
title_full Model-independent bounds on R(J/ψ)
title_fullStr Model-independent bounds on R(J/ψ)
title_full_unstemmed Model-independent bounds on R(J/ψ)
title_short Model-independent bounds on R(J/ψ)
title_sort model independent bounds on r j ψ
topic Heavy Quark Physics
Quark Masses and SM Parameters
Lattice QCD
url http://link.springer.com/article/10.1007/JHEP09(2018)168
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