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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2016, vol. 116, 5, p. -

Measurements of Absolute Hadronic Branching Fractions of the Λc+ Baryon

Ablikim M., Achasov M. N., Ai X. C., Albayrak O., Albrecht M., Ambrose D. J., Amoroso A., An F. F., An Q., Bai J. Z., Baldini Ferroli R., Ban Y., Bennett D. W., Bennett J. V., Bertani M., Bettoni D., Bian J. M., Bianchi F., Boger E., Boyko I., Briere R. A., Cai H., Cai X., Cakir O., Calcaterra A., Cao G. F., Cetin S. A., Chang J. F., Chelkov G., Chen G., Chen H. S., Chen H. Y., Chen J. C., Chen M. L., Chen S. J., Chen X., Chen X. R., Chen Y. B., Cheng H. P., Chu X. K., Cibinetto G., Dai H. L., Dai J. P., Dbeyssi A., Dedovich D., Deng Z. Y., Denig A., Denysenko I., Destefanis M., De Mori F., Ding Y., Dong C., Dong J., Dong L. Y., Dong M. Y., Dou Z. L., Du S. X., Duan P. F., Eren E. E., Fan J. Z., Fang J., Fang S. S., Fang X., Fang Y., Farinelli R., Fava L., Fedorov O., Feldbauer F., Felici G., Feng C. Q., Fioravanti E., Fritsch M., Fu C. D., Gao Q., Gao X. L., Gao X. Y.

© 2016 American Physical Society.We report the first measurement of absolute hadronic branching fractions of Λc+ baryon at the Λc+Λ¯c- production threshold, in the 30 years since the Λc+ discovery. In total, 12 Cabibbo-favored Λc+ hadronic decay modes are analyzed with a double-tag technique, based on a sample of 567 pb-1 of e+e- collisions at s=4.599 GeV recorded with the BESIII detector. A global least-squares fitter is utilized to improve the measured precision. Among the measurements for twelve Λc+ decay modes, the branching fraction for Λc+→pK-π+ is determined to be (5.84±0.27±0.23)%, where the first uncertainty is statistical and the second is systematic. In addition, the measurements of the branching fractions of the other 11 Cabibbo-favored hadronic decay modes are significantly improved.