Measurement of the Mass Splittings between the $b\bar{b}χ_{b,J}(1P)$ States

Details Measurement of the Mass Splittings between the $b\bar{b}χ_{b,J}(1P)$ States Measurement of the Mass Splittings between the $b\bar{b}χ_{b,J}(1P)$ States

1998-03-12

arxiv.org/abs/hep-ex/9803010v1

Phys.Rev.D59:032003,1999

Physics

High Energy Physics

High Energy Physics - Experiment

11 page postscript file, postscript file also available through http://w4.lns.cornell.edu/public/CLNS

Scientific paper

10.1103/PhysRevD.59.032003

We present new measurements of photon energies and branching fractions for the radiative transitions: Upsilon(2S)->gamma+chi_b(J=0,1,2). The masses of the chi_b states are determined from the measured radiative photon energies. The ratio of mass splittings between the chi_b substates, r==(M[J=2]-M[J=1])/(M[J=1]-M[J=0]) with M the chi_b mass, provides information on the nature of the bbbar confining potential. We find r(1P)=0.54+/-0.02+/-0.02. This value is in conflict with the previous world average, but more consistent with the theoretical expectation that r(1P)

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