Search for ${\mathrm{\Lambda }}_c^{+}\to \phi p{\pi }^0$ and branching fraction measurement of ${\mathrm{\Lambda }}_c^{+}\to K^{-}{\pi }^{+}p{\pi }^0$

Journal Article · Fri Sep 22 00:00:00 EDT 2017 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.96.051102· OSTI ID:1594353

Pal, B.; Schwartz, A. J.; Adachi, I.; Aihara, H.; Al Said, S.; Asner, D. M.; Aushev, T.; Ayad, R.; Badhrees, I.; Bakich, A. M.; Bansal, V.; Behera, P.; Berger, M.; Bhardwaj, V.; Biswal, J.; Bobrov, A.; Bozek, A.; Bračko, M.; Browder, T. E.; Červenkov, D. ; Chekelian, V.; Chen, A.; Cheon, B. G.; Chilikin, K.; Cho, K.; Choi, S. -K.; Choi, Y.; Cinabro, D.; Dash, N.; Di Carlo, S.; Doležal, Z.; Drásal, Z.; Eidelman, S.; Ferber, T.; Fulsom, B. G.; Gaur, V.; Gabyshev, N.; Garmash, A.; Goldenzweig, P.; Guido, E.; Hara, T.; Hayasaka, K.; Hayashii, H.; Hou, W. -S.; Hsu, C. -L.; Inami, K.; Ishikawa, A.; Itoh, R.; Jacobs, W. W.; Jaegle, I.; Jeon, H. B.; Jia, S.; Jin, Y.; Joffe, D.; Joo, K. K.; Karyan, G.; Kato, Y.; Kim, D. Y.; Kim, J. B.; Kim, K. T.; Kim, S. H.; Kim, Y. J.; Kinoshita, K.; Kodyš, P.; Korpar, S.; Kotchetkov, D.; Krokovny, P.; Kuhr, T.; Kulasiri, R.; Kwon, Y. -J.; Li, C. H.; Li, L.; Li, Y.; Li Gioi, L.; Libby, J.; Liventsev, D.; Lubej, M.; Luo, T.; MacNaughton, J.; Matvienko, D.; Merola, M.; Miyabayashi, K.; Miyata, H.; Mizuk, R.; Mohanty, G. B.; Moon, H. K.; Mori, T.; Mussa, R.; Nakano, E.; Nakao, M.; Nanut, T.; Nath, K. J.; Nayak, M.; Niiyama, M.; Nishida, S.; Ogawa, S.; Ono, H.; Pakhlov, P.; Pakhlova, G.; Pardi, S.; Park, C. -S.; Paul, S.; Pedlar, T. K.; Pestotnik, R.; Piilonen, L. E.; Ritter, M.; Rostomyan, A.; Sakai, Y.; Sandilya, S.; Santelj, L.; Sanuki, T.; Savinov, V.; Schneider, O.; Schnell, G.; Schwanda, C.; Seino, Y.; Senyo, K.; Sevior, M. E.; Shibata, T. -A.; Shiu, J. -G.; Simon, F.; Sokolov, A.; Solovieva, E.; Starič, M.; Strube, J. F.; Sumihama, M.; Sumiyoshi, T.; Takizawa, M.; Tamponi, U.; Tanida, K.; Tenchini, F.; Uchida, M.; Uglov, T.; Uno, S.; Van Hulse, C.; Varner, G.; Varvell, K. E.; Vinokurova, A.; Vorobyev, V.; Wang, C. H.; Wang, M. -Z.; Wang, X. L.; Watanabe, M.; Watanabe, Y.; Watanuki, S.; Widmann, E.; Won, E.; Yamashita, Y.; Ye, H.; Yelton, J.; Yuan, C. Z.; Zhang, Z. P.; Zhilich, V.; Zhukova, V.; Zhulanov, V.; Zupanc, A.

We have investigated the Cabibbo-suppressed decay ${\mathrm{\Lambda }}_c^{+}\to \phi p{\pi }^0$ in $e^{+}{e}^{-}$ collisions using a data sample corresponding to an integrated luminosity of $915{\mathrm{fb}}^{-1}$. The data were collected by the Belle experiment at the KEKB $e^{+}{e}^{-}$ asymmetric-energy collider running at or near the $\mathrm{{\rm Y}}\left(4S\right)$ and $\mathrm{{\rm Y}}\left(5S\right)$ resonances. No significant signal is observed, and we set an upper limit on the branching fraction of $\mathcal{B}({\mathrm{\Lambda }}_c^{+}\to \phi p{\pi }^0)<15.3\times {10}^{-5}$ at 90% confidence level. The contribution of nonresonant ${\mathrm{\Lambda }}_c^{+}\to K^{+}{K}^{-}p{\pi }^0$ decays is found to be consistent with zero, and the corresponding upper limit on its branching fraction is set to be $\mathcal{B}({\mathrm{\Lambda }}_c^{+}\to K^{+}{K}^{-}p{\pi }^0{)}_{\mathrm{NR}}<6.3\times {10}^{-5}$ at 90% confidence level. We also search 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 $\mathcal{B}({\mathrm{\Lambda }}_c^{+}\to P_s^{+}{\pi }^0)\times \mathcal{B}(P_s^{+}\to \phi p)<8.3\times {10}^{-5}$ at 90% confidence level. Finally, we measure the branching fraction for the Cabibbo-favored decay ${\mathrm{\Lambda }}_c^{+}\to K^{-}{\pi }^{+}p{\pi }^0$; the result is $\mathcal{B}({\mathrm{\Lambda }}_c^{+}\to K^{-}{\pi }^{+}p{\pi }^0)=\left(4.42\pm 0.05\right(\text{stat}\left)\pm 0.12\right(\text{syst}\left)\pm 0.16\right(\text{norm}\left)\right)\%$, which is the most decisive measurement to date.

• Research Organization: Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States); Univ. of Hawaii, Honolulu, HI (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)
• Contributing Organization: Belle Collaboration
• Grant/Contract Number: SC0009973; SC0010504
• OSTI ID: 1594353
• Alternate ID(s): OSTI ID: 1394018
• Journal Information: Physical Review D, Vol. 96, Issue 5; ISSN 2470-0010
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

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