First measurement of the Λc+→ pη′ decay

• Published in: The journal of high energy physics 2022-03, Vol.2022 (3), p.90
• Main Authors: Li, S. X., Shen, C. P., Adachi, I., Atmacan, H., Aushev, T., Ayad, R., Behera, P., Belous, K., Bessner, M., Bhardwaj, V., Bhuyan, B., Bilka, T., Bonvicini, G., Borah, J., Bračko, M., Budano, A., Chang, P., Cheon, B. G., Cho, S.-J., Choudhury, S., Dash, N., Dhamija, R., Fulsom, B. G., Garg, R., Goldenzweig, P., Golob, B., Hara, T., Hayasaka, K., Ishikawa, A., Jacobs, W. W., Jang, E.-J., Kaliyar, A. B., Kato, Y., Kawasaki, T., Kim, D. Y., Kinoshita, K., Kodyš, P., Korpar, S., Kroeger, R., Laurenza, M., Lee, S. C., Li, Y., Libby, J., Liventsev, D., Martini, A., Matsuda, T., Meier, F., Miyabayashi, K., Narwal, D., Nishimura, K., Ogawa, K., Ogawa, S., Ono, H., Oskin, P., Pakhlov, P., Pakhlova, G., Pardi, S., Park, S.-H., Patra, S., Pedlar, T. K., Pestotnik, R., Piilonen, L. E., Podobnik, T., Prim, M. T., Röhrken, M., Rostomyan, A., Sandilya, S., Sangal, A., Sanuki, T., Savinov, V., Schnell, G., Schueler, J., Schwanda, C., Shapkin, M., Sharma, C., Shebalin, V., Solovieva, E., Stottler, Z. S., Sumihama, M., Sumiyoshi, T., Sutcliffe, W., Tamponi, U., Tanida, K., Unno, Y., Uno, K., Uno, S., Urquijo, P., Vahsen, S. E., Van Tonder, R., Varner, G., Waheed, E., Wang, D., Wang, M.-Z., Won, E., Xu, X., Yabsley, B. D., Yan, W., Yin, J. H., Yusa, Y., Zhukova, V.
• Format: Article
• Language: English
• Subjects: Classical and Quantum Gravitation; Decay; Elementary Particles; High energy physics; High Energy Physics - Experiment; High Energy Physics - Phenomenology; Laboratories; Luminosity; Mathematics; Nuclear physics; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Quantum Physics; Regular Article - Experimental Physics; Relativity Theory; Science education; String Theory; Uncertainty
• ISSN: 1126-6708; 1029-8479
• DOI: 10.1007/JHEP03(2022)090

A bstract We present the first measurement of the branching fraction of the singly Cabibbo-suppressed (SCS) decay Λ c + → pη ′ with η ′ → ηπ + π − , using a data sample corresponding to an integrated luminosity of 981 fb − 1 , collected by the Belle detector at the KEKB e + e − asymmetric-energy collider. A significant Λ c + → pη ′ signal is observed for the first time with a signal significance of 5.4 σ . The relative branching fraction with respect to the normalization mode Λ c + → pK − π + is measured to be B Λ c + → pη ′ B Λ c + → pK − π + = 7.54 ± 1.32 ± 0.73 × 10 − 3 , where the uncertainties are statistical and systematic, respectively. Using the world-average value of B Λ c + → pK − π + = (6 . 28 ± 0 . 32) × 10 − 2 , we obtain B Λ c + → pη ′ = 4.73 ± 0.82 ± 0.46 ± 0.24 × 10 − 4 , where the uncertainties are statistical, systematic, and from B Λ c + → pK − π + , respectively.