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 $$ R\left(J/\psi \right)\equiv \mathrm{\mathcal{B}}\mathrm{\mathcal{R}}\left({B}_C^{+}\to J/\psi {\tau}^{+}{\nu}_{\tau}\right)/\mathrm{\mathcal{B}}\mathrm{\mathcal{R}}\left({B}_C^{+}\to J/\psi {\mu}^{+}{\nu}_{\mu}\righ...
Main Authors: | , , |
---|---|
Format: | Article |
Language: | English |
Published: |
SpringerOpen
2018-09-01
|
Series: | Journal of High Energy Physics |
Subjects: | |
Online Access: | http://link.springer.com/article/10.1007/JHEP09(2018)168 |
_version_ | 1818153985550319616 |
---|---|
author | Thomas D. Cohen Henry Lamm Richard F. Lebed |
author_facet | Thomas D. Cohen Henry Lamm Richard F. Lebed |
author_sort | Thomas D. Cohen |
collection | DOAJ |
description | Abstract We present a model-independent bound on RJ/ψ≡ℬℛBC+→J/ψτ+ντ/ℬℛBC+→J/ψµ+νµ $$ 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) $$. This bound is constructed by constraining the form factors through a combination of dispersive relations, heavy-quark relations at zero-recoil, and the limited existing determinations from lattice QCD. The resulting 95% confidence-level bound, 0.20 ≤ R(J/ψ) ≤ 0.39, agrees with the recent LHCb result at 1.3σ, and rules out some previously suggested model form factors. |
first_indexed | 2024-12-11T14:19:19Z |
format | Article |
id | doaj.art-c99ef194e4704a128792aa451053dcfe |
institution | Directory Open Access Journal |
issn | 1029-8479 |
language | English |
last_indexed | 2024-12-11T14:19:19Z |
publishDate | 2018-09-01 |
publisher | SpringerOpen |
record_format | Article |
series | Journal of High Energy Physics |
spelling | doaj.art-c99ef194e4704a128792aa451053dcfe2022-12-22T01:03:01ZengSpringerOpenJournal of High Energy Physics1029-84792018-09-012018911910.1007/JHEP09(2018)168Model-independent bounds on R(J/ψ)Thomas D. Cohen0Henry Lamm1Richard F. Lebed2Department of Physics, University of MarylandDepartment of Physics, University of MarylandDepartment of Physics, Arizona State UniversityAbstract We present a model-independent bound on RJ/ψ≡ℬℛBC+→J/ψτ+ντ/ℬℛBC+→J/ψµ+νµ $$ 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 |
work_keys_str_mv | AT thomasdcohen modelindependentboundsonrjps AT henrylamm modelindependentboundsonrjps AT richardflebed modelindependentboundsonrjps |