Measurements of branching fractions for electromagnetic transitions involving the χbJ(1P) states
Physical Review D - Particles, Fields, Gravitation and Cosmology 83:5 (2011)
Authors:
M Kornicer, RE Mitchell, CM Tarbert, D Besson, TK Pedlar, D Cronin-Hennessy, J Hietala, P Zweber, S Dobbs, Z Metreveli, KK Seth, A Tomaradze, T Xiao, S Brisbane, L Martin, A Powell, P Spradlin, G Wilkinson, H Mendez, JY Ge, DH Miller, IPJ Shipsey, B Xin, GS Adams, D Hu, B Moziak, J Napolitano, KM Ecklund, J Insler, H Muramatsu, CS Park, LJ Pearson, EH Thorndike, F Yang, S Ricciardi, C Thomas, M Artuso, S Blusk, R Mountain, T Skwarnicki, S Stone, JC Wang, LM Zhang, G Bonvicini, D Cinabro, A Lincoln, MJ Smith, P Zhou, J Zhu, P Naik, J Rademacker, DM Asner, KW Edwards, K Randrianarivony, G Tatishvili, RA Briere, H Vogel, PUE Onyisi, JL Rosner, JP Alexander, DG Cassel, S Das, R Ehrlich, L Fields, L Gibbons, SW Gray, DL Hartill, BK Heltsley, DL Kreinick, VE Kuznetsov, JR Patterson, D Peterson, D Riley, A Ryd, AJ Sadoff, X Shi, WM Sun, J Yelton, P Rubin, N Lowrey, S Mehrabyan, M Selen, J Wiss, J Libby
Abstract:
Using (9.32, 5.88) million Υ(2S,3S) decays taken with the CLEO III detector, we obtain five product branching fractions for the exclusive processes Υ(2S)→γχb0,1,2(1P)→γγΥ(1S) and Υ(3S)→γχb1,2(1P) →γγΥ(1S). We observe the transition χb0(1P) →γΥ(1S) for the first time. Using the known branching fractions for B[Υ(2S)→γχbJ(1P)], we extract values for B[χbJ(1P)→γΥ(1S)] for J=0, 1, 2. In turn, these values can be used to unfold the Υ(3S) product branching fractions to obtain values for B[Υ(3S)→γχb1,2(1P)] for the first time individually. Comparison of these with each other and with the branching fraction B[Υ(3S)→γχb0] previously measured by CLEO provides tests of relativistic corrections to electric dipole matrix elements. © 2011 American Physical Society.
