Production of Upsilon(1S) mesons from chi(b) decays in p&pmacr; collisions at sqrt |
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| Authors: | Toyoda Trischuk de Troconiz JF Truitt Tseng Turini Ukegawa Valls Vejcik Velev Vidal Vilar Vologouev Vucinic Wagner Wagner Wahl Wallace Walsh Wang Wang Wang Watanabe Waters Watts Webb |
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| Affiliation: | Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA. |
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| 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)]%. |
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