Precision Measurement of the Mass of the h_c(1P1) State of Charmonium

Details Precision Measurement of the Mass of the h_c(1P1) State of Charmonium Precision Measurement of the Mass of the h_c(1P1) State of Charmonium

2008-05-29

arxiv.org/abs/0805.4599v1

Phys.Rev.Lett.101:182003,2008

Physics

High Energy Physics

High Energy Physics - Experiment

9 pages, available through http://www.lns.cornell.edu/public/CLNS/, submitted to PRL

Scientific paper

10.1103/PhysRevLett.101.182003

A precision measurement of the mass of the h_c(1P1) state of charmonium has been made using a sample of 24.5 million psi(2S) events produced in e+e- annihilation at CESR. The reaction used was psi(2S) -> pi0 h_c, pi0 -> gamma gamma, h_c -> gamma eta_c, and the reaction products were detected in the CLEO-c detector. Data have been analyzed both for the inclusive reaction and for the exclusive reactions in which eta_c decays are reconstructed in fifteen hadronic decay channels. Consistent results are obtained in the two analyses. The averaged results of the present measurements are M(h_c)=3525.28+-0.19 (stat)+-0.12(syst) MeV, and B(psi(2S) -> pi0 h_c)xB(h_c -> gamma eta_c)= (4.19+-0.32+-0.45)x10^-4. Using the 3PJ centroid mass, Delta M_hf(1P)= - M(h_c) = +0.02+-0.19+-0.13 MeV.

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