Measurement of the mass splittings between the bb̄χb,J(1P) states Article

Edwards, KW, Bellerive, A, Janicek, R et al. (1999). Measurement of the mass splittings between the bb̄χb,J(1P) states . PHYSICAL REVIEW D, 59(3), 1-5. 10.1103/PhysRevD.59.032003

cited authors

  • Edwards, KW; Bellerive, A; Janicek, R; MacFarlane, DB; Patel, PM; Sadoff, AJ; Ammar, R; Baringer, P; Bean, A; Besson, D; Coppage, D; Darling, C; Davis, R; Kotov, S; Kravchenko, I; Kwak, N; Zhou, L; Anderson, S; Kubota, Y; Lee, SJ; O'Neill, JJ; Poling, R; Riehle, T; Smith, A; Alam, MS; Athar, SB; Ling, Z; Mahmood, AH; Timm, S; Wappler, F; Anastassov, A; Duboscq, JE; Fujino, D; Gan, KK; Hart, T; Honscheid, K; Kagan, H; Kass, R; Lee, J; Schwarthoff, H; Spencer, MB; Sung, M; Undrus, A; Wolf, A; Zoeller, MM; Richichi, SJ; Severini, H; Skubic, P; Bishai, M; Fast, J; Hinson, JW; Menon, N; Miller, DH; Shibata, EI; Shipsey, IPJ; Yurko, M; Glenn, S; Kwon, Y; Lyon, AL; Roberts, S; Thorndike, EH; Jessop, CP; Lingel, K; Marsiske, H; Perl, ML; Savinov, V; Ugolini, D; Zhou, X; Coan, TE; Fadeyev, V; Korolkov, I; Maravin, Y; Narsky, I; Shelkov, V; Staeck, J; Stroynowski, R; Volobouev, I; Ye, J; Artuso, M; Azfar, F; Efimov, A; Goldberg, M; He, D; Kopp, S; Moneti, GC; Mountain, R; Schuh, S; Skwarnicki, T; Stone, S; Viehhauser, G; Wang, JC; Xing, X; Bartelt, J; Csorna, SE; Jain, V; McLean, KW; Marka, S; Godang, R; Kinoshita, K; Lai, IC

authors

abstract

  • We present new measurements of photon energies and branching fractions for the radiative transitions Y(2S)→γχb(J=0,1,2)(1P). The masses of the χb states are determined from the measured radiative photon energies. The ratio of mass splittings between the χb substates, r≡(MJ=2-MJ=1)/(MJ=1-MJ=0), with M the χb mass, provides information on the nature of the bb̄ confining potential. We find r(1P)=0.542 ±0.022±0.024. This value is somewhat lower than the previous world average, but more consistent with the theoretical expectation that r(1P)b(1P) states than for the χb(2P) states. ©1999 The American Physical Society.

publication date

  • February 1, 1999

published in

Digital Object Identifier (DOI)

start page

  • 1

end page

  • 5

volume

  • 59

issue

  • 3