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arXiv · 1707.00089

Search for $\Lambda_c^+\to\phi p \pi^0$ and branching fraction measurement of $\Lambda_c^+\to K^-\pi^+ p \pi^0$

Belle Collaboration·B. Pal·A. J. Schwartz·I. Adachi·H. Aihara·S. Al Said·D. M. Asner·T. Aushev·R. Ayad·I. Badhrees·A. M. Bakich·V. Bansal·P. Behera·M. Berger·V. Bhardwaj·J. Biswal·A. Bobrov·A. Bozek·M. Bračko·T. E. Browder·D. Červenkov·V. Chekelian·A. Chen·B. G. Cheon·K. Chilikin·K. Cho·S. -K. Choi·Y. Choi·D. Cinabro·N. Dash·S. Di Carlo·Z. Doležal·Z. Drásal·S. Eidelman·T. Ferber·B. G. Fulsom·V. Gaur·N. Gabyshev·A. Garmash·P. Goldenzweig·E. Guido·T. Hara·K. Hayasaka·H. Hayashii·W. -S. Hou·C. -L. Hsu·K. Inami·A. Ishikawa·R. Itoh·W. W. Jacobs·I. Jaegle·H. B. Jeon·S. Jia·Y. Jin·D. Joffe·K. K. Joo·G. Karyan·Y. Kato·D. Y. Kim·J. B. Kim·K. T. Kim·S. H. Kim·Y. J. Kim·K. Kinoshita·P. Kodyš·S. Korpar·D. Kotchetkov·P. Krokovny·T. Kuhr·R. Kulasiri·Y. -J. Kwon·C. H. Li·L. Li·Y. Li·L. Li Gioi·J. Libby·D. Liventsev·M. Lubej·T. Luo·J. MacNaughton·D. Matvienko·M. Merola·K. Miyabayashi·H. Miyata·R. Mizuk·G. B. Mohanty·H. K. Moon·T. Mori·R. Mussa·E. Nakano·M. Nakao·T. Nanut·K. J. Nath·M. Nayak·M. Niiyama·S. Nishida·S. Ogawa·H. Ono·P. Pakhlov·G. Pakhlova
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Abstract

We have searched for the Cabibbo-suppressed decay $\Lambda_c^+\to\phi p\pi^0$ in $e^+e^-$ collisions using a data sample corresponding to an integrated luminosity of 915 $\rm fb^{-1}$. The data were collected by the Belle experiment at the KEKB $e^+e^-$ asymmetric-energy collider running at or near the $\Upsilon(4S)$ and $\Upsilon(5S)$ resonances. No significant signal is observed, and we set an upper limit on the branching fraction of $\mathcal{B}(\Lambda_c^+\to \phi p\pi^0) <15.3\times10^{-5}$ at 90% confidence level. The contribution for nonresonant $\Lambda_c^+\to K^+K^- p\pi^0$ decays is found to be consistent with zero and the corresponding upper limit on its branching fraction is set to be $\mathcal{B}(\Lambda_c^+\to K^+K^-p\pi^0)_{\rm NR} <6.3\times10^{-5} $ at 90% confidence level. We also measure the branching fraction for the Cabibbo-favored decay $\Lambda_c^+\to K^-\pi^+p\pi^0$; the result is $\mathcal{B}(\Lambda_c^+\to K^-\pi^+p\pi^0)= (4.42\pm0.05\, (\rm stat.) \pm 0.12\, (\rm syst.) \pm 0.16\, (\mathcal{B}_{\rm Norm}))\%$, which is the most precise measurement to date. Finally, we have searched for an intermediate hidden-strangeness pentaquark decay $P^+_s\to\phi p$. We see no evidence for this intermediate decay and set an upper limit on the product branching fraction of ${\cal B}(\Lambda_c^+\to P^+_s \pi^0)\times {\cal B}(P^+_s\to\phi p) <8.3\times 10^{-5}$ at 90% confidence level.

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Belle Collaboration, B. Pal, A. J. Schwartz, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, T. Aushev, R. Ayad, I. Badhrees, A. M. Bakich, V. Bansal, P. Behera, M. Berger, V. Bhardwaj, J. Biswal, A. Bobrov, A. Bozek, M. Bračko, T. E. Browder, D. Červenkov, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, K. Cho, S. -K. Choi, Y. Choi, D. Cinabro, N. Dash, S. Di Carlo, Z. Doležal, Z. Drásal, S. Eidelman, T. Ferber, B. G. Fulsom, V. Gaur, N. Gabyshev, A. Garmash, P. Goldenzweig, E. Guido, T. Hara, K. Hayasaka, H. Hayashii, W. -S. Hou, C. -L. Hsu, K. Inami, A. Ishikawa, R. Itoh, W. W. Jacobs, I. Jaegle, H. B. Jeon, S. Jia, Y. Jin, D. Joffe, K. K. Joo, G. Karyan, Y. Kato, D. Y. Kim, J. B. Kim, K. T. Kim, S. H. Kim, Y. J. Kim, K. Kinoshita, P. Kodyš, S. Korpar, D. Kotchetkov, P. Krokovny, T. Kuhr, R. Kulasiri, Y. -J. Kwon, C. H. Li, L. Li, Y. Li, L. Li Gioi, J. Libby, D. Liventsev, M. Lubej, T. Luo, J. MacNaughton, D. Matvienko, M. Merola, K. Miyabayashi, H. Miyata, R. Mizuk, G. B. Mohanty, H. K. Moon, T. Mori, R. Mussa, E. Nakano, M. Nakao, T. Nanut, K. J. Nath, M. Nayak, M. Niiyama, S. Nishida, S. Ogawa, H. Ono, P. Pakhlov, G. Pakhlova. 2017-07-01. Search for $\Lambda_c^+\to\phi p \pi^0$ and branching fraction measurement of $\Lambda_c^+\to K^-\pi^+ p \pi^0$. https://doi.org/10.1103/physrevd.96.051102

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