May 29, 2018 to June 3, 2018
Hyatt Regency Indian Wells Conference Center
US/Pacific timezone

Model Independent Constraints on $R(J/\psi)$

May 29, 2018, 4:10 PM
20m
North Foyer | Joshua Tree Room (Hyatt Regency Indian Wells Conference Center)

North Foyer | Joshua Tree Room

Hyatt Regency Indian Wells Conference Center

44600 Indian Wells Lane, Indian Wells, CA 92210, USA

Speaker

Dr Henry Lamm (University of Maryland)

Description

LHCb has recently presented a measurement of $R(J/\psi)=\mathcal{BR}(B_c^+\rightarrow J/\Psi \tau^+\bar\nu_\tau)/\mathcal{BR}(B_c^+\rightarrow J/\Psi \mu^+\bar\nu_\mu)$. The value, $R(J/\psi)=0.71\pm 0.17\pm 0.18$ is in mild tension with the range of model predictions 0.25-0.28. The model transition form factors dominate the systematic uncertainty of the measurement and limit the predictions to a range of values. To improve this situation, we have undertaken to compute model-independent constraints on the transitions form factors via dispersive methods. This allow for rigorous error estimates to be assigned and $R(J/\psi)$ to be computed.
E-mail [email protected]
Funding source DE-FG02-93ER-40762

Primary author

Dr Henry Lamm (University of Maryland)

Presentation materials