We have reconstructed the radiative decays chi(b)(1P) --> Y(1S)gamma and chi(b)(2P) --> Y(1S)gamma in (p) over bar p collisions at root s = 1.8 TeV, and measured the fraction of Y(1S) mesons that originate-from these decays. For Y(1S) mesons with p(T)(Y) > 8.0 GeV/c, the fractions that come from chi(b)(1P) and chi(b)(2P) decays are [27.1 +/- 619(stat) +/- 4.4(syst)]% and [10.5 +/- 4.4(stat) +/- 1.4(syst)]%, respectively. We have derived the fraction of directly produced Y(1S) mesons to be [50.9 +/- 8.2(stat) +/- 9.0(syst)]%.

Production of Upsilon(1S) Mesons from chi(b) decays in p(p)over-bar collisions at root s=1.8 TeV

INTROZZI, GIANLUCA;
2000-01-01

Abstract

We have reconstructed the radiative decays chi(b)(1P) --> Y(1S)gamma and chi(b)(2P) --> Y(1S)gamma in (p) over bar p collisions at root s = 1.8 TeV, and measured the fraction of Y(1S) mesons that originate-from these decays. For Y(1S) mesons with p(T)(Y) > 8.0 GeV/c, the fractions that come from chi(b)(1P) and chi(b)(2P) decays are [27.1 +/- 619(stat) +/- 4.4(syst)]% and [10.5 +/- 4.4(stat) +/- 1.4(syst)]%, respectively. We have derived the fraction of directly produced Y(1S) mesons to be [50.9 +/- 8.2(stat) +/- 9.0(syst)]%.
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T., Affolder; H., Akimoto; A., Akopian; M. G., Albrow; P., Amaral; S. R., Amendolia; D., Amidei; J., Antos; G., Apollinari; T., Arisawa; T., Asakawa; ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11571/577515
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