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arXiv · 2112.14276

First Measurement of the $\Lambda_c^+ \to p \eta'$ decay

Belle Collaboration·S. X. Li·J. X. Cui·C. P. Shen·I. Adachi·H. Aihara·S. Al Said·D. M. Asner·H. Atmacan·T. Aushev·R. Ayad·V. Babu·P. Behera·K. Belous·M. Bessner·V. Bhardwaj·B. Bhuyan·T. Bilka·D. Bodrov·G. Bonvicini·J. Borah·A. Bozek·M. Bracko·P. Branchini·T. E. Browder·A. Budano·M. Campajola·D. Cervenkov·M. -C. Chang·P. Chang·V. Chekelian·A. Chen·B. G. Cheon·K. Chilikin·H. E. Cho·K. Cho·S. -J. Cho·S. -K. Choi·Y. Choi·S. Choudhury·D. Cinabro·S. Cunliffe·S. Das·N. Dash·G. De Nardo·G. De Pietro·R. Dhamija·F. Di Capua·Z. Dolezal·T. V. Dong·D. Epifanov·T. Ferber·D. Ferlewicz·B. G. Fulsom·R. Garg·V. Gaur·N. Gabyshev·A. Giri·P. Goldenzweig·B. Golob·E. Graziani·T. Gu·T. Hara·K. Hayasaka·H. Hayashii·W. -S. Hou·K. Inami·A. Ishikawa·M. Iwasaki·Y. Iwasaki·W. W. Jacobs·E. -J. Jang·S. Jia·Y. Jin·K. K. Joo·J. Kahn·A. B. Kaliyar·K. H. Kang·Y. Kato·T. Kawasaki·H. Kichimi·C. Kiesling·C. H. Kim·D. Y. Kim·Y. -K. Kim·K. Kinoshita·P. Kodys·T. Konno·A. Korobov·S. Korpar·E. Kovalenko·P. Krizan·R. Kroeger·P. Krokovny·M. Kumar·R. Kumar·K. Kumara·Y. -J. Kwon·T. Lam·M. Laurenza
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Abstract

We present the first measurement of the branching fraction of the singly Cabibbo-suppressed (SCS) decay $\Lambda_c^+ \to p \eta'$ with $\eta' \to \eta\pi^+\pi^-$, using a data sample corresponding to an integrated luminosity of 981 $\rm fb^{-1}$, collected by the Belle detector at the KEKB $e^{+}$$e^{-}$ asymmetric-energy collider. A significant $\Lambda_c^+$ signal is observed for the first time with a signal significance of 5.4$\sigma$. The relative branching fraction with respect to the normalization mode $\Lambda_c^+ \to pK^-\pi^+$ is measured to be \begin{equation*} \frac{{\cal B}(\Lambda_c^+ \to p \eta')}{{\cal B}(\Lambda_c^+ \to p K^-\pi^+)} = (7.54 \pm 1.32 \pm 0.75) \times 10^{-3}, \end{equation*} where the uncertainties are statistical and systematic, respectively. Using the world-average value of ${\cal B}(\Lambda_c^+ \to p K^-\pi^+) = (6.28\pm0.32)\times10^{-2}$, we obtain \begin{equation*} {\cal B}(\Lambda_c^+ \to p \eta') = (4.73 \pm 0.82 \pm 0.47 \pm 0.24)\times 10^{-4}, \end{equation*} where the uncertainties are statistical, systematic, and from ${\cal B}(\Lambda_c^+ \to pK^-\pi^+)$, respectively.

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Belle Collaboration, S. X. Li, J. X. Cui, C. P. Shen, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, H. Atmacan, T. Aushev, R. Ayad, V. Babu, P. Behera, K. Belous, M. Bessner, V. Bhardwaj, B. Bhuyan, T. Bilka, D. Bodrov, G. Bonvicini, J. Borah, A. Bozek, M. Bracko, P. Branchini, T. E. Browder, A. Budano, M. Campajola, D. Cervenkov, M. -C. Chang, P. Chang, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, H. E. Cho, K. Cho, S. -J. Cho, S. -K. Choi, Y. Choi, S. Choudhury, D. Cinabro, S. Cunliffe, S. Das, N. Dash, G. De Nardo, G. De Pietro, R. Dhamija, F. Di Capua, Z. Dolezal, T. V. Dong, D. Epifanov, T. Ferber, D. Ferlewicz, B. G. Fulsom, R. Garg, V. Gaur, N. Gabyshev, A. Giri, P. Goldenzweig, B. Golob, E. Graziani, T. Gu, T. Hara, K. Hayasaka, H. Hayashii, W. -S. Hou, K. Inami, A. Ishikawa, M. Iwasaki, Y. Iwasaki, W. W. Jacobs, E. -J. Jang, S. Jia, Y. Jin, K. K. Joo, J. Kahn, A. B. Kaliyar, K. H. Kang, Y. Kato, T. Kawasaki, H. Kichimi, C. Kiesling, C. H. Kim, D. Y. Kim, Y. -K. Kim, K. Kinoshita, P. Kodys, T. Konno, A. Korobov, S. Korpar, E. Kovalenko, P. Krizan, R. Kroeger, P. Krokovny, M. Kumar, R. Kumar, K. Kumara, Y. -J. Kwon, T. Lam, M. Laurenza. 2021-12-28. First Measurement of the $\Lambda_c^+ \to p \eta'$ decay. https://doi.org/10.1007/jhep03(2022)090

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