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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2012, vol. 108, p. -

Spin-parity analysis of pp̄ mass threshold structure in J/ψ and ψ(3686) radiative decays

Ablikim M., Achasov M. N., Alberto D., Ambrose D. J., An F. F., An Q., An Z. H., Bai J. Z., Baldini Ferroli R. B F, Ban Y., Becker J., Berger N., Bertani M. B., Bian J. M., Boger E., Bondarenko O., Boyko I., Briere R. A., Bytev V., Cai X., Calcaterra A. C., Cao G. F., Chang J. F., Chelkov G., Chen G., Chen H. S., Chen J. C., Chen M. L., Chen S. J., Chen Y., Chen Y. B., Cheng H. P., Chu Y. P., Cronin-Hennessy D., Dai H. L., Dai J. P., Dedovich D., Deng Z. Y., Denysenko I., Destefanis M., Ding Ding W. L., Ding Y., Dong L. Y., Dong M. Y., Du S. X., Fang J., Fang S. S., Feng C. Q., Fu C. D., Fu J. L., Gao Y., Geng C., Goetzen K., Gong W. X., Greco M., Gu M. H., Gu Y. T., Guan Y. H., Guo A. Q., Guo L. B., Guo Y. P., Han Y. L., Hao X. Q., Harris F. A., He K. L., He M., He Z. Y., Heng Y. K., Hou Z. L., Hu H. M., Hu J. F., Hu T., Huang B., Huang G. M., Huang J. S., Huang X. T., Huang Y. P., Hussain T., Ji C. S., Ji Q., Ji X. B., Ji X. L., Jia L. K., Jiang L. L., Jiang X. S., Jiao J. B., Jiao Z., Jin D. P., Jin S., Jing F. F., Kalantar-Nayestanaki N., Kavatsyuk M., Kuehn W., Lai W., Lange J. S., Leung J. K C, Li C. H.

A partial wave analysis of the pp̄ mass-threshold enhancement in the reaction J/ψ→γpp̄ is used to determine its JPC quantum numbers to be 0 -+, its peak mass to be below threshold at M=1832-5+19(stat)-17+18(syst)±19(model)MeV/c2, and its total width to be Γ<76MeV/c2 at the 90% C.L. The product of branching ratios is measured to be BR[J/ψ→γX(pp̄)]BR[X(pp̄)→pp̄]=[9.0-1. 1+0.4(stat)-5.0+1.5(syst)±2.3(model)]×10 -5. A similar analysis performed on ψ(3686)→γpp̄ decays shows, for the first time, the presence of a corresponding enhancement with a production rate relative to that for J/ψ decays of R=[5.08-0.45+0.71(stat)-3.58+0.67(syst) ±0.12(model)]%. © 2012 American Physical Society.