title: Production of Upsilon(1S) mesons from chi(b) decays in p&pmacr; collisions at sqrt
abstract: We have reconstructed the radiative decays chi(b)(1P)-->Upsilon(1S)gamma and chi(b)(2P)-->Upsilon(1S)gamma in p&pmacr; collisions at sqrt[s] = 1.8 TeV, and measured the fraction of Upsilon(1S) mesons that originate from these decays. For Upsilon(1S) mesons with p(Upsilon)(T)>8.0 GeV/c, the fractions that come from chi(b)(1P) and chi(b)(2P) decays are [27.1+/-6.9(stat)+/-4. 4(syst)]% and [10.5+/-4.4(stat)+/-1.4(syst)]%, respectively. We have derived the fraction of directly produced Upsilon(1S) mesons to be [50.9+/-8.2(stat)+/-9.0(syst)]%.
authors.affiliation: Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
authors.initials: H
authors.lastname: Toyoda
authors.initials: W
authors.lastname: Trischuk
authors.lastname: de Troconiz JF
authors.initials: S
authors.lastname: Truitt
authors.initials: J
authors.lastname: Tseng
authors.initials: N
authors.lastname: Turini
authors.initials: F
authors.lastname: Ukegawa
authors.initials: J
authors.lastname: Valls
authors.initials: S
authors.lastname: Vejcik
authors.initials: G
authors.lastname: Velev
authors.initials: R
authors.lastname: Vidal
authors.initials: R
authors.lastname: Vilar
authors.initials: I
authors.lastname: Vologouev
authors.initials: D
authors.lastname: Vucinic
authors.initials: RG
authors.lastname: Wagner
authors.initials: RL
authors.lastname: Wagner
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authors.lastname: Wahl
authors.initials: NB
authors.lastname: Wallace
authors.initials: AM
authors.lastname: Walsh
authors.initials: C
authors.lastname: Wang
authors.initials: CH
authors.lastname: Wang
authors.initials: MJ
authors.lastname: Wang
authors.initials: T
authors.lastname: Watanabe
authors.initials: D
authors.lastname: Waters
authors.initials: T
authors.lastname: Watts
authors.initials: R
authors.lastname: Webb