Measurements of branching fractions of $Λ_c^+ \to Σ^+ η$ and $Λ_c^+ \to Σ^+ η'$ and asymmetry parameters of $Λ_c^+ \to Σ^+ π^0$, $Λ_c^+ \to Σ^+ η$, and $Λ_c^+ \to Σ^+ η'$
Creators: name: Belle Collaboration
name: Li, S. X.
name: Shen, C. P.
name: Adachi, I.
name: Ahn, J. K.
name: Aihara, H.
name: Asner, D. M.
name: Atmacan, H.
name: Aushev, T.
name: Ayad, R.
name: Babu, V.
name: Bahinipati, S.
name: Banerjee, Sw.
name: Behera, P.
name: Belous, K.
name: Bennett, J.
name: Bessner, M.
name: Bilka, T.
name: Biswas, D.
name: Bobrov, A.
name: Bodrov, D.
name: Borah, J.
name: Bračko, M.
name: Branchini, P.
name: Browder, T. E.
name: Budano, A.
name: Campajola, M.
name: Červenkov, D.
name: Chang, M. -C.
name: Chang, P.
name: Chekelian, V.
name: Chen, A.
name: Cheon, B. G.
name: Chilikin, K.
name: Cho, H. E.
name: Cho, K.
name: Cho, S. -J.
name: Choi, S. -K.
name: Choi, Y.
name: Choudhury, S.
name: Cinabro, D.
name: De Pietro, G.
name: Dhamija, R.
name: Di Capua, F.
name: Dong, T. V.
name: Ferber, T.
name: Frey, A.
name: Fulsom, B. G.
name: Gaur, V.
name: Giri, A.
name: Goldenzweig, P.
name: Graziani, E.
name: Gu, T.
name: Gudkova, K.
name: Hadjivasiliou, C.
name: Hayasaka, K.
name: Hayashii, H.
name: Hsu, C. -L.
name: Inami, K.
name: Ipsita, N.
name: Ishikawa, A.
name: Itoh, R.
name: Jacobs, W. W.
name: Jin, Y.
name: Joo, K. K.
name: Kalita, D.
name: Kaliyar, A. B.
name: Kiesling, C.
name: Kim, C. H.
name: Kim, D. Y.
name: Kim, K. -H.
name: Kim, Y. -K.
name: Kodyš, P.
name: Konno, T.
name: Korobov, A.
name: Korpar, S.
name: Kovalenko, E.
name: Krokovny, P.
name: Kuhr, T.
name: Kumar, M.
name: Kumar, R.
name: Kumara, K.
name: Kuzmin, A.
name: Kwon, Y. -J.
name: Lam, T.
name: Lange, J. S.
name: Lee, S. C.
name: Li, L. K.
name: Li, Y.
name: Li, Y. B.
name: Gioi, L. Li
name: Libby, J.
name: Lieret, K.
name: Masuda, M.
name: Matsuda, T.
name: Maurya, S. K.
name: Meier, F.
name: Merola, M.
name: Metzner, F.
name: Mizuk, R.
name: Mussa, R.
name: Nakamura, I.
name: Nakao, M.
name: Natkaniec, Z.
name: Natochii, A.
name: Nayak, L.
name: Niiyama, M.
name: Nisar, N. K.
name: Nishida, S.
name: Ogawa, S.
name: Ono, H.
name: Onuki, Y.
name: Oskin, P.
name: Pakhlova, G.
name: Pardi, S.
name: Park, H.
name: Patra, S.
name: Paul, S.
name: Pedlar, T. K.
name: Pestotnik, R.
name: Piilonen, L. E.
name: Prencipe, E.
name: Prim, M. T.
name: Rout, N.
name: Russo, G.
name: Sahoo, D.
name: Sandilya, S.
name: Sangal, A.
name: Santelj, L.
name: Savinov, V.
name: Schnell, G.
name: Schwanda, C.
name: Seino, Y.
name: Senyo, K.
name: Sevior, M. E.
name: Shan, W.
name: Shapkin, M.
name: Sharma, C.
name: Shiu, J. -G.
name: Sokolov, A.
name: Solovieva, E.
name: Starič, M.
name: Sumihama, M.
name: Sumisawa, K.
name: Sumiyoshi, T.
name: Sutcliffe, W.
name: Takizawa, M.
name: Tamponi, U.
name: Tanida, K.
name: Tenchini, F.
name: Uchida, M.
name: Uglov, T.
name: Unno, Y.
name: Uno, S.
name: Vahsen, S. E.
name: van Tonder, R.
name: Varner, G.
name: Vinokurova, A.
name: Waheed, E.
name: Wang, E.
name: Watanabe, M.
name: Watanuki, S.
name: Won, E.
name: Yabsley, B. D.
name: Yan, W.
name: Yang, S. B.
name: Yelton, J.
name: Yin, J. H.
name: Yuan, C. Z.
name: Zhang, Z. P.
name: Zhilich, V.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We report a study of $Λ_c^+ \to Σ^+ π^0$, $Λ_c^+ \to Σ^+ η$, and $Λ_c^+ \to Σ^+ η'$ using the data sample corresponding to an integrated luminosity of 980 $\rm fb^{-1}$ collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. The branching fractions relative to $Λ_c^+ \to Σ^+ π^0$ are measured as: $\mathcal{B}_{Λ_c^+ \to Σ^+ η}/\mathcal{B}_{Λ_c^+ \to Σ^+ π^0}=0.25 \pm 0.03 \pm 0.01$ and $\mathcal{B}_{Λ_c^+ \to Σ^+ η'}/\mathcal{B}_{Λ_c^+ \to Σ^+ π^0}=0.33 \pm 0.06 \pm 0.02$. Using $\mathcal{B}_{Λ_c^+ \to Σ^+ π^0}=(1.25 \pm 0.10)\%$, we obtain $\mathcal{B}_{Λ_c^+ \to Σ^+ η}=(3.14 \pm 0.35 \pm 0.11 \pm 0.25)\times10^{-3}$ and $\mathcal{B}_{Λ_c^+ \to Σ^+ η'}=(4.16 \pm 0.75 \pm 0.21 \pm 0.33)\times10^{-3}$. Here the uncertainties are statistical, systematic, and from $\mathcal{B}_{Λ_c^+ \to Σ^+ π^0}$, respectively. The ratio of the branching fraction of $Λ_c^+ \to Σ^+ η'$ with respect to that of $Λ_c^+ \to Σ^+ η$ is measured to be $\mathcal{B}_{Λ_c^+ \to Σ^+ η'}/\mathcal{B}_{Λ_c^+ \to Σ^+ η}=1.34 \pm 0.28 \pm 0.06$. We update the asymmetry parameter of $Λ_c^+ \to Σ^+ π^0$, $α_{Σ^+ π^0} = -0.48 \pm 0.02 \pm 0.02$, with a considerably improved precision. The asymmetry parameters of $Λ_c^+ \to Σ^+ η$ and $Λ_c^+ \to Σ^+ η'$ are measured to be $α_{Σ^+ η} = -0.99 \pm 0.03 \pm 0.05$ and $α_{Σ^+ η'} = -0.46 \pm 0.06 \pm 0.03$ for the first time.
description: 12 pages, 8 figures; accepted for publication as a Regular Article in Physical Review D