Production of Υ(1S) Mesons from χb decays in p(p)over-bar collisions at √s=1.8 TeV

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)]%.