Observation of Upsilon(3S)-->tau+tau- and tests of lepton universality in Upsilon decays

D Besson; T K Pedlar; D Cronin-Hennessy; K Y Gao; D T Gong; J Hietala; Y Kubota; T Klein; B W Lang; R Poling; A W Scott; A Smith; P Zweber; S Dobbs; Z Metreveli; K K Seth; A Tomaradze; J Ernst; H Severini; S A Dytman; W Love; V Savinov; O Aquines; Z Li; A Lopez; S Mehrabyan; H Mendez; J Ramirez; G S Huang; D H Miller; V Pavlunin; B Sanghi; I P J Shipsey; B Xin; G S Adams; M Anderson; J P Cummings; I Danko; J Napolitano; Q He; J Insler; H Muramatsu; C S Park; E H Thorndike; F Yang; T E Coan; Y S Gao; F Liu; M Artuso; S Blusk; J Butt; N Horwitz; J Li; N Menaa; R Mountain; S Nisar; K Randrianarivony; R Redjimi; R Sia; T Skwarnicki; S Stone; J C Wang; K Zhang; S E Csorna; G Bonvicini; D Cinabro; M Dubrovin; A Lincoln; D M Asner; K W Edwards; R A Briere; I Brock; J Chen; T Ferguson; G Tatishvili; H Vogel; M E Watkins; J L Rosner; N E Adam; J P Alexander; K Berkelman; D G Cassel; J E Duboscq; K M Ecklund; R Ehrlich; L Fields; R S Galik; L Gibbons; R Gray; S W Gray; D L Hartill; B K Heltsley; D Hertz; C D Jones; J Kandaswamy; D L Kreinick; V E Kuznetsov; H Mahlke-Krüger; T O Meyer; P U E Onyisi; J R Patterson; D Peterson; J Pivarski; D Riley; A Ryd; A J Sadoff; H Schwarthoff; X Shi; S Stroiney; W M Sun; T Wilksen; M Weinberger; S B Athar; R Patel; V Potlia; J Yelton; P Rubin; C Cawlfield; B I Eisenstein; I Karliner; D Kim; N Lowrey; P Naik; C Sedlack; M Selen; E J White; J Wiss; M R Shepherd; CLEO Collaboration

doi:10.1103/PhysRevLett.98.052002

Observation of Upsilon(3S)-->tau+tau- and tests of lepton universality in Upsilon decays

Phys Rev Lett. 2007 Feb 2;98(5):052002. doi: 10.1103/PhysRevLett.98.052002. Epub 2007 Jan 29.

Authors

D Besson¹, T K Pedlar, D Cronin-Hennessy, K Y Gao, D T Gong, J Hietala, Y Kubota, T Klein, B W Lang, R Poling, A W Scott, A Smith, P Zweber, S Dobbs, Z Metreveli, K K Seth, A Tomaradze, J Ernst, H Severini, S A Dytman, W Love, V Savinov, O Aquines, Z Li, A Lopez, S Mehrabyan, H Mendez, J Ramirez, G S Huang, D H Miller, V Pavlunin, B Sanghi, I P J Shipsey, B Xin, G S Adams, M Anderson, J P Cummings, I Danko, J Napolitano, Q He, J Insler, H Muramatsu, C S Park, E H Thorndike, F Yang, T E Coan, Y S Gao, F Liu, M Artuso, S Blusk, J Butt, N Horwitz, J Li, N Menaa, R Mountain, S Nisar, K Randrianarivony, R Redjimi, R Sia, T Skwarnicki, S Stone, J C Wang, K Zhang, S E Csorna, G Bonvicini, D Cinabro, M Dubrovin, A Lincoln, D M Asner, K W Edwards, R A Briere, I Brock, J Chen, T Ferguson, G Tatishvili, H Vogel, M E Watkins, J L Rosner, N E Adam, J P Alexander, K Berkelman, D G Cassel, J E Duboscq, K M Ecklund, R Ehrlich, L Fields, R S Galik, L Gibbons, R Gray, S W Gray, D L Hartill, B K Heltsley, D Hertz, C D Jones, J Kandaswamy, D L Kreinick, V E Kuznetsov, H Mahlke-Krüger, T O Meyer, P U E Onyisi, J R Patterson, D Peterson, J Pivarski, D Riley, A Ryd, A J Sadoff, H Schwarthoff, X Shi, S Stroiney, W M Sun, T Wilksen, M Weinberger, S B Athar, R Patel, V Potlia, J Yelton, P Rubin, C Cawlfield, B I Eisenstein, I Karliner, D Kim, N Lowrey, P Naik, C Sedlack, M Selen, E J White, J Wiss, M R Shepherd; CLEO Collaboration

Affiliation

¹ University of Kansas, Lawrence, Kansas 66045, USA.

PMID: 17358847
DOI: 10.1103/PhysRevLett.98.052002

Abstract

Using data collected with the CLEO III detector at the CESR e+e- collider, we report on a first observation of the decay Upsilon(3S)-->tau+tau-, and precisely measure the ratio of branching fractions of Upsilon(nS), n=1, 2, 3, to tau+tau- and mu+mu- final states, finding agreement with expectations from lepton universality. We derive absolute branching fractions for these decays, and also set a limit on the influence of a low mass CP-odd Higgs boson in the decay of the Upsilon(1S).