2020/06/29 by Pouya Asadi, Anna Hallin, Jorge Martin Camalich +2 · 1 citation
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #Hadron #Lepton #Meson #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics beyond the Standard Model #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph
paper · pdf · doi:10.1103/physrevd.102.095028
20 pages + appendices, 5 figures
arxiv created 2020/06/29 · openalex created_date 2020/07/10 · openalex publication_date 2020/11/30 · arxiv updated 2020/12/30 · openalex updated_date 2026/08/06
The meson decays B\ensuremath→D\ensuremathτ\ensuremathν and B\ensuremath→D*\ensuremathτ\ensuremathν are sensitive probes of the b\ensuremath→c\ensuremathτ\ensuremathν transition. In this work, we present a complete framework to obtain the maximum information on the physics of B\ensuremath→D(*)\ensuremathτ\ensuremathν with polarized \ensuremathτ leptons and unpolarized D(*) mesons. Focusing on the hadronic decays \ensuremathτ\ensuremath→\ensuremathπ\ensuremathν and \ensuremathτ\ensuremath→\ensuremathρ\ensuremathν, we show how to extract seven \ensuremathτ asymmetries from a fully differential analysis of the final-state kinematics. At Belle II with 50 ab^\ensuremath-1 of data, these asymmetries could potentially be measured with percent-level statistical uncertainty. This would open a new window into possible new physics contributions in b\ensuremath→c\ensuremathτ\ensuremathν and would allow us to decipher its Lorentz and gauge structure.