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arXiv · 1807.02730

Model-Independent Bounds on $R(J/\psi)$

Thomas D. Cohen·Henry Lamm·Richard F. Lebed
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Abstract

We present a model-independent bound on $R(J/\psi) \! \equiv \! \mathcal{BR} (B_c^+ \rightarrow J/\psi \, \tau^+\nu_\tau)/ \mathcal{BR} (B_c^+ \rightarrow J/\psi \, \mu^+\nu_\mu)$. 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, $0.20\leq R(J/\psi)\leq0.39$, agrees with the recent LHCb result at $1.3 \, \sigma$, and rules out some previously suggested model form factors.

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Thomas D. Cohen, Henry Lamm, Richard F. Lebed. 2018-07-08. Model-Independent Bounds on $R(J/\psi)$. https://doi.org/10.1007/jhep09(2018)168

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