PoS - Proceedings of Science
Volume 314 - The European Physical Society Conference on High Energy Physics (EPS-HEP2017) - Flavour Physics and Fundamental Symmetries (Parallel Session). Conveners: Johannes Abrecht; Damir Becirevic; Philip Urquijo. Scientific Secretary: Martino Margoni
The invariant and helicity amplitudes in the transitions $\Lambda_b\to\Lambda^\ast(\frac12^\pm,\frac32^\pm)+J/\psi$.
M.A. Ivanov
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Pre-published on: January 09, 2018
Published on: March 20, 2018
Abstract
We present results for the invariant and helicity amplitudes in the transitions $\Lambda_b\to\Lambda^{(\ast)}(J^P)+J/\psi$ where the $\Lambda^{(\ast)}(J^P)$ are $\Lambda(sud)$-type ground and excited states with $J^P$ quantum numbers $J^P=\frac12^{\pm},\frac32^{\pm}$. The calculations are performed in the framework of a covariant confined quark model. This analysis is important for the identification of the hidden charm pentaquark states $P_c^+(4380)$ and $P_c^+(4450)$ which were discovered by the LHCb Coll. We also discuss the possible New Physics effects in the exclusive decays $\bar{B}^0 \to D^{(\ast)} \tau\bar{\nu}_{\tau}$. We extend the Standard Model by taking into account right-handed vector (axial), left- and right-handed (pseudo)scalar, and tensor current contributions. The $\bar{B}^0 \to D^{(\ast)}$ transition form factors are calculated in the full kinematic $q^2$ range by employing a covariant quark model.
DOI: https://doi.org/10.22323/1.314.0220
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