[Theory-seminars] Theory seminar tomorrow

[Miguel Albaladejo]

Dear all,

find below a reminder for the theory seminar tomorrow.

Best regards,
Carlota, Raza, Miguel

Theory Seminar: Monday, May 20, 1:00 – 2:00pm, Room L102
Henry Lamm (University of Maryland)
Title: Model-independent bounds on semi-leptonic decays $B_c^+$
Abstract: Model-independent bounds on $R(J/\psi) \! \equiv \!\mathcal{BR} (B_c^+ \rightarrow J/\psi \, \tau^+\nu_\tau)/\mathcal{BR} (B_c^+ \rightarrow J/\psi \, \mu^+\nu_\mu)$ are obtained through a combination of dispersive relations, heavy-quark relations at zero-recoil, and the limited existing form factor 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 removes the dominant model-dependent uncertainty from theory predictions.  Using the same techniques, a prediction of $R(\eta_c)=0.29(5)$ is obtained.
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