Production of Upsilon(1S) mesons from chi(b) decays in p&pmacr; collisions at sqrt
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)]%.
Toyoda
H
Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
Trischuk
W
de Troconiz JF
Truitt
S
Tseng
J
Turini
N
Ukegawa
F
Valls
J
Vejcik
S
Velev
G
Vidal
R
Vilar
R
Vologouev
I
Vucinic
D
Wagner
RG
Wagner
RL
Wahl
J
Wallace
NB
Walsh
AM
Wang
C
Wang
CH
Wang
MJ
Watanabe
T
Waters
D
Watts
T
Webb
R