2010/12/31 by The CLEO Collaboration, M. Kornicer, R. E. Mitchell +92 · 11 citations
Physics and Astronomy · #Branching fraction #High-Energy Particle Collisions Research #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #hep-ex
paper · pdf · doi:10.1103/physrevd.83.054003
published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 83(5) (American Physical Society) · 22 pages, 6 figures, version published in Physical Review D
openalex publication_date 2011/03/03 · arxiv created 2011/03/16 · arxiv updated 2011/03/21 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Using (9.32, 5.88) million \ensuremathΥ(2S,3S) decays taken with the CLEO III detector, we obtain five product branching fractions for the exclusive processes \ensuremathΥ(2S)\ensuremath→\ensuremathγ\ensuremathχb0,1,2(1P)\ensuremath→\ensuremathγ\ensuremathγ\ensuremathΥ(1S) and \ensuremathΥ(3S)\ensuremath→\ensuremathγ\ensuremathχb1,2(1P)\ensuremath→\ensuremathγ\ensuremathγ\ensuremathΥ(1S). We observe the transition \ensuremathχb0(1P)\ensuremath→\ensuremathγ\ensuremathΥ(1S) for the first time. Using the known branching fractions for B[\ensuremathΥ(2S)\ensuremath→\ensuremathγ\ensuremathχbJ(1P)], we extract values for B[\ensuremathχbJ(1P)\ensuremath→\ensuremathγ\ensuremathΥ(1S)] for J=0, 1, 2. In turn, these values can be used to unfold the \ensuremathΥ(3S) product branching fractions to obtain values for B[\ensuremathΥ(3S)\ensuremath→\ensuremathγ\ensuremathχb1,2(1P)] for the first time individually. Comparison of these with each other and with the branching fraction B[\ensuremathΥ(3S)\ensuremath→\ensuremathγ\ensuremathχb0] previously measured by CLEO provides tests of relativistic corrections to electric dipole matrix elements.