Abstract
We present the first evidence for the production of Y(1D) states in the four-photon cascade, Y(3S)-->gammachi(b)(2P), chi(b)(2P)-->gammaY(1D), Y(1D)-->gammachi(b)(1P), chi(b)(1P)-->gammaY(1S), followed by the Y(1S) annihilation into e(+)e(-) or mu(+)mu(-). The signal has a significance of 10.2 standard deviations. The measured product branching ratio for these five decays, (2.5+/-0.5+/-0.5)x10(-5), is consistent with the theoretical estimates. The data are dominated by the production of one Y(1D) state consistent with the J=2 assignment. Its mass is determined to be (10161.1+/-0.6+/-1.6) MeV, which is consistent with the predictions from potential models and lattice QCD calculations. We also searched for Y(3S)-->gammachi(b)(2P), chi(b)(2P)-->gammaY(1D), followed by either Y(1D)-->etaY(1S) or Y(1D)-->pi(+)pi(-)Y(1S). We find no evidence for such decays and set upper limits on the product branching ratios.
Published in:
Physical Review D 70,3 (2004) 032001;
Link to original published article:
http://dx.doi.org/10.1103/PhysRevD.70.032001
Keywords
ks dynamical configurations;; d-wave quarkonium;; heavy quarkonium;; bound-states;; hadronic transitions;; decay constants;; qcd;; spectroscopy;; spectrum;; detector
Date of Version
January 2004
Recommended Citation
Bonvicini, G.; Cinabro, D.; Dubrovin, M.; Bornheim, A.; Lipeles, E.; Pappas, S. P.; Shapiro, A.; Weinstein, A. J.; Briere, R. A.; Chen, G. P.; Ferguson, T.; Tatishvili, G.; Vogel, H.; Watkins, M. E.; Adam, N. E.; Alexander, J. P.; Berkelman, K.; Boisvert, V.; Cassel, D. G.; Duboscq, J. E.; Ecklund, K. M.; Ehrlich, R.; Galik, R. S.; Gibbons, L.; Gittelman, B.; Gray, S. W.; Hartill, D. L.; Heltsley, B. K.; Hsu, L.; Jones, C. D.; Kandaswamy, J.; Kreinick, D. L.; Kuznetsov, V. E.; Magerkurth, A.; Mahlke-Kruger, H.; Meyer, T. O.; Patterson, J. R.; Pedlar, T. K.; Peterson, D.; Pivarski, J.; Riley, D.; Rosner, J. L.; Sadoff, A. J.; Schwarthoff, H.; Shepherd, M. R.; Sun, W. M.; Thayer, J. G.; Urner, D.; Wilksen, T.; Weinberger, M.; Athar, S. B.; Avery, P.; Breva-Newell, L.; Potlia, V.; Stoeck, H.; Yelton, J.; Eisenstein, B. I.; Gollin, G. D.; Karliner, I.; Lowrey, N.; Naik, P.; Sedlack, C.; Selen, M.; Thaler, J. J.; Williams, J.; Edwards, K. W.; Besson, D.; Gao, K. Y.; Gong, D. T.; Kubota, Y.; Li, S. Z.; Poling, R.; Scott, A. W.; Smith, A.; Stepaniak, C. J.; Urheim, J.; Metreveli, Z.; Seth, K. K.; Tomaradze, A.; Zweber, P.; Ernst, J.; Arms, K.; Eckhart, E.; Gan, K. K.; Gwon, C.; Severini, H.; Skubic, P.; Asner, D. M.; Dytman, S. A.; Mehrabyan, S.; Mueller, J. A.; Nam, S.; Savinov, V.; Huang, G. S.; Miller, D. H.; Pavlunin, V.; Sanghi, B.; Shibata, E. I.; Shipsey, I. P. J.; Adams, G. S.; Chasse, M.; Cummings, J. P.; Danko, I.; Napolitano, J.; Cronin-Hennessy, D.; Park, C. S.; Park, W.; Thayer, J. B.; Thorndike, E. H.; Coan, T. E.; Gao, Y. S.; Liu, F.; Stroynowski, R.; Artuso, M.; Boulahouache, C.; Blusk, S.; Butt, J.; Dambasuren, E.; Dorjkhaidav, O.; Haynes, J.; Menaa, N.; Mountain, R.; Muramatsu, H.; Nandakumar, R.; Redjimi, R.; Sia, R.; Skwarnicki, T.; Stone, S.; Wang, J. C.; Zhang, K.; Mahmood, A. H.; and Csorna, S. E., "First observation of a Upsilon(1D) state" (2004). Department of Physics and Astronomy Faculty Publications. Paper 518.
https://docs.lib.purdue.edu/physics_articles/518