2015/09/16 by Benjamı́n Grinstein, Benjamín Grinstein, Jorge Martin Camalich · 3 citations
Physics and Astronomy · #B meson #Branching fraction #Electron #Excited state #High-Energy Particle Collisions Research #Lepton #Meson #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Pseudoscalar #Pseudoscalar meson #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-lat #hep-ph
paper · pdf · doi:10.1103/physrevlett.116.141801
published as Phys. Rev. Lett. 116, 141801 (2016) · 21 pages
arxiv created 2015/09/16 · openalex publication_date 2016/04/04 · arxiv updated 2016/04/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We investigate the decays of the excited (bq) mesons as probes of the short-distance structure of the weak \mathrm\ensuremathΔB=1 transitions. These states are unstable under the electromagnetic or strong interactions, although their widths are typically suppressed by phase space. Compared to the pseudoscalar B meson, the purely leptonic decays of the vector B* are not chirally suppressed and are sensitive to different combinations of the underlying weak effective operators. An interesting example is Bs*\ensuremath→\ensuremathℓ+\ensuremathℓ^\ensuremath-, which has a rate that can be accurately predicted in the standard model. The branching fraction is B\ensuremath∼10^\ensuremath-11, irrespective of the lepton flavor and where the main uncertainty stems from the unmeasured and theoretically not well known Bs* width. We discuss the prospects for producing this decay mode at the LHC and explore the possibility of measuring the Bs*\ensuremath→\ensuremathℓ\ensuremathℓ amplitude, instead, through scattering experiments at the Bs* resonance peak.