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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2013, vol. 87, p. -

Measurements of ψ′→p̄K+Σ0 and χcJ→p̄K+Λ

Ablikim M., Achasov M. N., Albayrak O., Ambrose D. J., An F. F., An Q., Bai J. Z., Ban Y., Becker J., Bennett J. V., Bertani M., Bian J. M., Boger E., Bondarenko O., Boyko I., Briere R. A., Bytev V., Cai X., Cakir O., Calcaterra A., Cao G. F., Cetin S. A., Chang J. F., Chelkov G., Chen G., Chen H. S., Chen J. C., Chen M. L., Chen S. J., Chen X., Chen Y. B., Cheng H. P., Chu Y. P., Cronin-Hennessy D., Dai H. L., Dai J. P., Dedovich D., Deng Z. Y., Denig A., Denysenko I., Destefanis M., Ding W. M., Ding Y., Dong L. Y., Dong M. Y., Du S. X., Fang J., Fang S. S., Fava L., Feng C. Q., Ferroli R. B., Friedel P., Fu C. D., Gao Y., Geng C., Goetzen K., Gong W. X., Gradl W., Greco M., Gu M. H., Gu Y. T., Guan Y. H., Guo A. Q., Guo L. B., Guo T., Guo Y. P., Han Y. L., Harris F. A., He K. L., He M., He Z. Y., Held T., Heng Y. K., Hou Z. L., Hu C., Hu H. M., Hu J. F., Hu T., Huang G. M., Huang G. S., Huang J. S., Huang L., Huang X. T., Huang Y., Huang Y. P., Hussain T., Ji C. S., Ji Q., Ji Q. P., Ji X. B., Ji X. L., Jiang L. L., Jiang X. S., Jiao J. B., Jiao Z., Jin D. P., Jin S.

Using a sample of 1.06×108 ψ′ mesons collected with the BESIII detector at the BEPCII e+e- collider and χcJ mesons produced via radiative transitions from the ψ′, we report the first observation for ψ′→p̄K+Σ0+c.c. (charge conjugate), as well as improved measurements for the χcJ hyperon decays χcJ→p̄K+Λ+c.c. The branching fractions are measured to be B(ψ′→p̄K +Σ0+c.c.)=(1.67±0.13±0.12)×10-5, B(χc0→p̄K+Λ+c.c.)=(13.2±0. 3±1.0)×10-4, B(χc1→p̄K +Λ+c.c.)=(4.5±0.2±0.4)×10-4, and B(χc2→p̄K+Λ+c.c.)=(8.4±0. 3±0.6)×10-4, where the first error is statistical, and the second is systematic. In the decay of χc0→p̄K +Λ+c.c., an anomalous enhancement near threshold is observed in the invariant mass distribution of p̄Λ+c.c., which cannot be explained by phase space. © 2013 American Physical Society.