Li, S. X.Cui, J. X.Shen, C. P.Adachi, I.Aihara, H.Al Said, S.Asner, D. M.Atmacan, H.Aushev, T.Ayad, R.Babu, V.Behera, P.Belous, K.Bessner, M.Bhardwaj, V.Bhuyan, B.Bilka, T.Bodrov, D.Bonvicini, G.Borah, J.Bozek, A.Bracko, M.Branchini, P.Browder, T. E.Budano, A.Campajola, M.Chang, M. -C.Chang, P.Chekelian, V.Chen, A.Cheon, B. G.Chilikin, K.Cho, H. E.Cho, K.Cho, S. -J.Choi, S. -K.Choi, Y.Choudhury, S.Cinabro, D.Cunliffe, S.Das, S.Dash, N.De Nardo, G.De Pietro, G.Dhamija, R.Di Capua, F.Dolezal, Z.Dong, T.Epifanov, D.Ferber, T.Ferlewicz, D.Fulsom, B. G.Garg, R.Gaur, V.Gabyshev, N.Giri, A.Goldenzweig, P.Golob, B.Graziani, E.Gu, T.Hara, T.Hayasaka, K.Hayashii, H.Hou, W. -S.Inami, K.Ishikawa, A.Iwasaki, M.Iwasaki, Y.Jacobs, W. W.Jang, E. -J.Jia, S.Jin, Y.Joo, K. K.Kahn, J.Kaliyar, A. B.Kang, K. H.Kato, Y.Kawasaki, T.Kichimi, H.Kiesling, C.Kim, C. H.Kim, D. Y.Kim, Y. -K.Kinoshita, K.Kodys, P.Konno, T.Korobov, A.Korpar, S.Kovalenko, E.Krizan, P.Kroeger, R.Krokovny, P.Kumar, M.Kumar, R.Kumara, K.Kwon, Y. -J.Lam, T.Laurenza, M.Lee, S. C.Li, J.Li, L. K.Li, Y.Li Gioi, L.Libby, J.Liventsev, D.Martini, A.Masuda, M.Matsuda, T.Matvienko, D.Maurya, S. K.Meier, F.Merola, M.Miyabayashi, K.Mizuk, R.Mussa, R.Nakao, M.Narwal, D.Natkaniec, Z.Natochii, A.Nayak, L.Nisar, N. K.Nishida, S.Nishimura, K.Ogawa, K.Ogawa, S.Ono, H.Oskin, P.Pakhlov, P.Pakhlova, G.Pang, T.Pardi, S.Park, S. -H.Patra, S.Pedlar, T. K.Pestotnik, R.Piilonen, Leo E.Podobnik, T.Popov, V.Prim, M. T.Rohrken, M.Rostomyan, A.Rout, N.Russo, G.Sahoo, D.Sandilya, S.Sangal, A.Sanuki, T.Savinov, V.Schnell, G.Schueler, J.Schwanda, C.Schwartz, A. J.Seino, Y.Senyo, K.Sevior, M. E.Shapkin, M.Sharma, C.Shebalin, V.Shiu, J. -G.Shwartz, B.Simon, F.Solovieva, E.Stanic, S.Staric, M.Stottler, Z. S.Sumihama, M.Sumisawa, K.Sumiyoshi, T.Sutcliffe, W.Takizawa, M.Tamponi, U.Tanida, K.Tenchini, F.Trabelsi, K.Uchida, M.Unno, Y.Uno, K.Uno, S.Urquijo, P.Vahsen, S. E.Van Tonder, R.Varner, G.Vinokurova, A.Waheed, E.Wang, D.Wang, E.Wang, M. -Z.Watanuki, S.Won, E.Xu, X.Yabsley, B. D.Yan, W.Ye, H.Yin, J. H.Yusa, Y.Zhai, Y.Zhilich, V.Zhukova, V.2024-01-222024-01-222022-03-151029-8479https://hdl.handle.net/10919/117471We present the first measurement of the branching fraction of the singly Cabibbo-suppressed (SCS) decay Λc+→ 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 Λc+→ pη′ signal is observed for the first time with a signal significance of 5.4σ. The relative branching fraction with respect to the normalization mode Λc+→ pK−π+ is measured to beB(Λc+→pη′)B(Λc+→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(Λc+→pK−π+) = (6.28 ± 0.32) × 10−2, we obtainB(Λc+→pη′)=(4.73±0.82±0.46±0.24)×10−4, where the uncertainties are statistical, systematic, and from B(Λc+→pK−π+), respectively. [Figure not available: see fulltext.]15 page(s)application/pdfenIn CopyrightBranching fractione(+)-e(-) ExperimentsCharm PhysicsParticle and Resonance ProductionArticle - Refereedhttps://doi.org/10.1007/JHEP03(2022)09020223Piilonen, Leo [0000-0001-6836-0748]1029-8479