Measurement of the muonic branching fractions of the narrow upsilon resonances

G S Adams; M Chasse; M Cravey; J P Cummings; I Danko; J Napolitano; D Cronin-Hennessy; C S Park; W Park; J B Thayer; E H Thorndike; T E Coan; Y S Gao; F Liu; R Stroynowski; M Artuso; C Boulahouache; S Blusk; J Butt; E Dambasuren; O Dorjkhaidav; N Menaa; R Mountain; H Muramatsu; R Nandakumar; R Redjimi; R Sia; T Skwarnicki; S Stone; J C Wang; K Zhang; S E Csorna; G Bonvicini; D Cinabro; M Dubrovin; A Bornheim; S P Pappas; A J Weinstein; R A Briere; G P Chen; T Ferguson; G Tatishvili; H Vogel; M E Watkins; 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; B Gittelman; R Gray; S W Gray; D L Hartill; B K Heltsley; D Hertz; L Hsu; 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; J L Rosner; A Ryd; A J Sadoff; H Schwarthoff; M R Shepherd; W M Sun; J G Thayer; D Urner; T Wilksen; M Weinberger; S B Athar; P Avery; L Breva-Newell; R Patel; V Potlia; H Stoeck; J Yelton; P Rubin; C Cawlfield; B I Eisenstein; G D Gollin; I Karliner; D Kim; N Lowrey; P Naik; C Sedlack; M Selen; J J Thaler; J Williams; J Wiss; K W Edwards; D Besson; K Y Gao; D T Gong; Y Kubota; B W Lang; S Z Li; R Poling; A W Scott; A Smith; C J Stepaniak; J Urheim; Z Metreveli; K K Seth; A Tomaradze; P Zweber; J Ernst; A H Mahmood; K Arms; K K Gan; D M Asner; S A Dytman; S Mehrabyan; J A Mueller; V Savinov; Z Li; A Lopez; H Mendez; J Ramirez; G S Huang; D H Miller; V Pavlunin; B Sanghi; E I Shibata; I P J Shipsey; CLEO

doi:10.1103/PhysRevLett.94.012001

Measurement of the muonic branching fractions of the narrow upsilon resonances

Phys Rev Lett. 2005 Jan 14;94(1):012001. doi: 10.1103/PhysRevLett.94.012001. Epub 2005 Jan 6.

Authors

G S Adams¹, M Chasse, M Cravey, J P Cummings, I Danko, J Napolitano, D Cronin-Hennessy, C S Park, W Park, J B Thayer, E H Thorndike, T E Coan, Y S Gao, F Liu, R Stroynowski, M Artuso, C Boulahouache, S Blusk, J Butt, E Dambasuren, O Dorjkhaidav, N Menaa, R Mountain, H Muramatsu, R Nandakumar, R Redjimi, R Sia, T Skwarnicki, S Stone, J C Wang, K Zhang, S E Csorna, G Bonvicini, D Cinabro, M Dubrovin, A Bornheim, S P Pappas, A J Weinstein, R A Briere, G P Chen, T Ferguson, G Tatishvili, H Vogel, M E Watkins, 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, B Gittelman, R Gray, S W Gray, D L Hartill, B K Heltsley, D Hertz, L Hsu, 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, J L Rosner, A Ryd, A J Sadoff, H Schwarthoff, M R Shepherd, W M Sun, J G Thayer, D Urner, T Wilksen, M Weinberger, S B Athar, P Avery, L Breva-Newell, R Patel, V Potlia, H Stoeck, J Yelton, P Rubin, C Cawlfield, B I Eisenstein, G D Gollin, I Karliner, D Kim, N Lowrey, P Naik, C Sedlack, M Selen, J J Thaler, J Williams, J Wiss, K W Edwards, D Besson, K Y Gao, D T Gong, Y Kubota, B W Lang, S Z Li, R Poling, A W Scott, A Smith, C J Stepaniak, J Urheim, Z Metreveli, K K Seth, A Tomaradze, P Zweber, J Ernst, A H Mahmood, K Arms, K K Gan, D M Asner, S A Dytman, S Mehrabyan, J A Mueller, V Savinov, Z Li, A Lopez, H Mendez, J Ramirez, G S Huang, D H Miller, V Pavlunin, B Sanghi, E I Shibata, I P J Shipsey; CLEO

Affiliation

¹ Rensselaer Polytechnic Institute, Troy, New York 12180, USA.

PMID: 15698068
DOI: 10.1103/PhysRevLett.94.012001

Abstract

The decay branching fractions of the three narrow Upsilon resonances to mu(+)mu(-) have been measured by analyzing about 4.3 fb(-1) e(+)e(-) data collected with the CLEO III detector. The branching fraction B(Upsilon(1S)-->mu(+)mu(-))=(2.49+/-0.02+/-0.07)% is consistent with the current world average, but B(Upsilon(2S)-->mu(+)mu(-))=(2.03+/-0.03+/-0.08)% and B(Upsilon(3S)-->mu(+)mu(-))=(2.39+/-0.07+/-0.10)% are significantly larger than prior results. These new muonic branching fractions imply a narrower total decay width for the Upsilon(2S) and Upsilon(3S) resonances and lower other branching fractions that rely on these decays in their determination.