Abstract
We report the first measurement of the absolute branching fraction of the inclusive decay Lambda _c^+ rightarrow K_S^0X. The analysis is performed using an e^+e^- collision data sample corresponding to an integrated luminosity of 567 hbox {pb}^{-1} taken at sqrt{s} = 4.6 GeV with the BESIII detector. Using eleven Cabibbo-favored {bar{Lambda }}_c^- decay modes and the double-tag technique, this absolute branching fraction is measured to be {mathcal {B}}(Lambda _c^+ rightarrow K_S^0X)=(9.9pm 0.6pm 0.4)%, where the first uncertainty is statistical and the second systematic. The relative deviation between the branching fractions for the inclusive decay and the observed exclusive decays is (18.7pm 8.3)%, which indicates that there may be some unobserved decay modes with a neutron or excited baryons in the final state.
Highlights
We report the first measurement of the absolute branching fraction of the inclusive decay
+ c decays to will help to quantify the missing decay modes and test the predicted branching fractions (BFs) of decay modes extrapolated by the statistical isospin model
Requirement, while proton particle identification (PID) is applied in order to improve signal significance
Summary
M. Ablikim1, M. N. Achasov10,d, P. Adlarson64, S. Ahmed15, M. Albrecht4, A. Amoroso63a,63c, Q. An48,60, Anita21, Y. Bai47, O. Bakina29, R. Baldini Ferroli23a, I. Balossino24a, Y. Ban38,l, K. Begzsuren26, J. V. Bennett5, N. Berger28, M. Bertani23a, D. Bettoni24a, F. Bianchi63a,63c, J Biernat64, J. Bloms57, A. Bortone63a,63c, I. Boyko29, R. A. Briere5, H. Cai65, X. Cai1,48, A. Calcaterra23a, G. F. Cao1,52, N. Cao1,52, S. A. Cetin51b, J. F. Chang1,48, W. L. Chang1,52, G. Chelkov29,b,c, D. Y. Chen6, G. Chen1, H. S. Chen1,52, M. L. Chen1,48, S. J. Chen36, X. R. Chen25, Y. B. Chen1,48, W. Cheng63c, G. Cibinetto24a, F. Cossio63c, X. F. Cui37, H. L. Dai1,48, J. P. Dai42,h, X. C. Dai1,52, A. Dbeyssi15, R. B. de Boer4, D. Dedovich29, Z. Y. Deng1, A. Denig28, I. Denysenko29, M. Destefanis63a,63c, F. De Mori63a,63c, Y. Ding34, C. Dong37, J. Dong1,48, L. Y. Dong1,52, M. Y. Dong1,48,52, S. X. Du68, J. Fang1,48, S. S. Fang1,52, Y. Fang1, R. Farinelli24a,24b, L. Fava63b,63c, F. Feldbauer4, G. 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Zou1 Shanxi University, Taiyuan 030006, People’s Republic of China Sichuan University, Chengdu 610064, People’s Republic of China Soochow University, Suzhou 215006, People’s Republic of China Southeast University, Nanjing 211100, People’s Republic of China State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China Sun Yat-Sen University, Guangzhou 510275, People’s Republic of China Tsinghua University, Beijing 100084, People’s Republic of China (a)Ankara University, Tandogan, 06100 Ankara, Turkey; (b)Istanbul Bilgi University, 34060 Eyup, Istanbul, Turkey; (c)Uludag University, 16059 Bursa, Turkey; (d)Near East University, Mersin 10, Nicosia, North Cyprus, Turkey University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China University of Hawaii, Honolulu, HI 96822, USA University of Jinan, Jinan 250022, People’s Republic of China University of Manchester, Oxford Road, Manchester M13 9PL, UK University of Minnesota, Minneapolis, MN 55455, USA University of Muenster, Wilhelm-Klemm-Str. 9, 48149 Münster, Germany University of Oxford, Keble Rd, Oxford OX13RH, UK University of Science and Technology Liaoning, Anshan 114051, People’s Republic of China University of Science and Technology of China, Hefei 230026, People’s Republic of China University of South China, Hengyang 421001, People’s Republic of China University of the Punjab, Lahore 54590, Pakistan (a)University of Turin, 10125 Turin, Italy; (b)University of Eastern Piedmont, 15121 Alessandria, Italy; (c)INFN, 10125 Turin, Italy Uppsala University, Box 516, 75120 Uppsala, Sweden Wuhan University, Wuhan 430072, People’s Republic of China Xinyang Normal University, Xinyang 464000, People’s Republic of China Zhejiang University, Hangzhou 310027, People’s Republic of China Zhengzhou University, Zhengzhou 450001, People’s Republic of China
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