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25 April 2024

» pubmed » pmid11017217

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Production of Upsilon(1S) mesons from chi(b) decays in p&pmacr; collisions at sqrt
H Toyoda ; W Trischuk ; de Troconiz JF ; S Truitt ; J Tseng ; N Turini ; F Ukegawa ; J Valls ; S Vejcik ; G Velev ; R Vidal ; R Vilar ; I Vologouev ; D Vucinic ; R G Wagner ; R L Wagner ; J Wahl ; N B Wallace ; A M Walsh ; C Wang ; C H Wang ; M J Wang ; T Watanabe ; D Waters ; T Watts ; R Webb ;
Date:	6 Mar 2000
Journal:	Phys Rev Lett, 84 (10), 2094-9
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)]%.
Source:	PubMed, pmid11017217
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