Model-independent bounds on R(J/ψ)

Thomas D. Cohen; Henry Lamm; Richard Lebed

doi:10.1007/JHEP09(2018)168

Model-independent bounds on R(J/ψ)

Thomas D. Cohen, Henry Lamm, Richard Lebed

Physics

Research output: Contribution to journal › Article › peer-review

32 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 language	English (US)
Article number	168
Journal	Journal of High Energy Physics
Volume	2018
Issue number	9
DOIs	https://doi.org/10.1007/JHEP09(2018)168
State	Published - Sep 1 2018

Keywords

Heavy Quark Physics
Lattice QCD
Quark Masses and SM Parameters

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1007/JHEP09(2018)168

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title = "Model-independent bounds on R(J/ψ)",

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.",

keywords = "Heavy Quark Physics, Lattice QCD, Quark Masses and SM Parameters",

author = "Cohen, {Thomas D.} and Henry Lamm and Richard Lebed",

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T1 - Model-independent bounds on R(J/ψ)

AU - Cohen, Thomas D.

AU - Lamm, Henry

AU - Lebed, Richard

PY - 2018/9/1

Y1 - 2018/9/1

N2 - 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.

AB - 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.

KW - Heavy Quark Physics

KW - Lattice QCD

KW - Quark Masses and SM Parameters

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DO - 10.1007/JHEP09(2018)168

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JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

IS - 9

M1 - 168

ER -

Model-independent bounds on R(J/ψ)

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Keywords

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