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arXiv · 1306.5947

First Observation of Cabibbo-Suppressed \Xi_c^0 Decays

Belle Collaboration·R. Chistov·I. Adachi·H. Aihara·D. M. Asner·V. Aulchenko·T. Aushev·A. M. Bakich·A. Bala·V. Bhardwaj·B. Bhuyan·A. Bondar·G. Bonvicini·A. Bozek·M. Bračko·J. Brodzicka·T. E. Browder·V. Chekelian·A. Chen·P. Chen·B. G. Cheon·K. Chilikin·I. -S. Cho·K. Cho·V. Chobanova·Y. Choi·D. Cinabro·M. Danilov·Z. Doležal·D. Dutta·S. Eidelman·D. Epifanov·H. Farhat·J. E. Fast·M. Feindt·T. Ferber·A. Frey·V. Gaur·N. Gabyshev·S. Ganguly·R. Gillard·Y. M. Goh·B. Golob·J. Haba·T. Hara·K. Hayasaka·H. Hayashii·Y. Horii·Y. Hoshi·W. -S. Hou·H. J. Hyun·T. Iijima·A. Ishikawa·R. Itoh·Y. Iwasaki·T. Julius·D. H. Kah·J. H. Kang·E. Kato·T. Kawasaki·H. Kichimi·C. Kiesling·D. Y. Kim·H. J. Kim·J. B. Kim·J. H. Kim·K. T. Kim·Y. J. Kim·K. Kinoshita·J. Klucar·B. R. Ko·P. Kodyš·S. Korpar·P. Križan·T. Kumita·A. Kuzmin·Y. -J. Kwon·J. S. Lange·S. -H. Lee·J. Li·Y. Li·J. Libby·C. Liu·Y. Liu·D. Liventsev·P. Lukin·D. Matvienko·H. Miyata·R. Mizuk·G. B. Mohanty·A. Moll·T. Mori·N. Muramatsu·R. Mussa·E. Nakano·M. Nakao·Z. Natkaniec·M. Nayak·E. Nedelkovska·C. Ng
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Abstract

We report the first observation of the Cabibbo-suppressed decays $\Xi_c^0\rightarrow \Xi^- K^+$, $\Xi_c^0\ra\Lambda K^+ K^-$ and $\Xi_c^0\rightarrow \Lambda \phi$, using a data sample of $711\, \mathrm{fb}^{-1}$ collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. We measure the ratios of branching fractions to be $\frac{{\cal B}(\Xi_c^0\ra \Xi^- K^+)}{{\cal B}(\Xi^0_c\ra\Xi^-\pi^+)}=(2.75\pm 0.51\pm 0.25)\times 10^{-2}$, $\frac{{\cal B}(\Xi_c^0\ra\Lambda K^+ K^-)}{{\cal B}(\Xi_c^0\rightarrow\Xi^- \pi^+)}=(2.86\pm 0.61\pm 0.24)\times 10^{-2}$ and $\frac{{\cal B}(\Xi_c^0\ra \Lambda\phi)}{{\cal B}(\Xi^0_c\ra\Xi^-\pi^+)}=(3.43\pm 0.58\pm 0.32)\times 10^{-2}$, where the first uncertainty is statistical and the second is systematic.

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Belle Collaboration, R. Chistov, I. Adachi, H. Aihara, D. M. Asner, V. Aulchenko, T. Aushev, A. M. Bakich, A. Bala, V. Bhardwaj, B. Bhuyan, A. Bondar, G. Bonvicini, A. Bozek, M. Bračko, J. Brodzicka, T. E. Browder, V. Chekelian, A. Chen, P. Chen, B. G. Cheon, K. Chilikin, I. -S. Cho, K. Cho, V. Chobanova, Y. Choi, D. Cinabro, M. Danilov, Z. Doležal, D. Dutta, S. Eidelman, D. Epifanov, H. Farhat, J. E. Fast, M. Feindt, T. Ferber, A. Frey, V. Gaur, N. Gabyshev, S. Ganguly, R. Gillard, Y. M. Goh, B. Golob, J. Haba, T. Hara, K. Hayasaka, H. Hayashii, Y. Horii, Y. Hoshi, W. -S. Hou, H. J. Hyun, T. Iijima, A. Ishikawa, R. Itoh, Y. Iwasaki, T. Julius, D. H. Kah, J. H. Kang, E. Kato, T. Kawasaki, H. Kichimi, C. Kiesling, D. Y. Kim, H. J. Kim, J. B. Kim, J. H. Kim, K. T. Kim, Y. J. Kim, K. Kinoshita, J. Klucar, B. R. Ko, P. Kodyš, S. Korpar, P. Križan, T. Kumita, A. Kuzmin, Y. -J. Kwon, J. S. Lange, S. -H. Lee, J. Li, Y. Li, J. Libby, C. Liu, Y. Liu, D. Liventsev, P. Lukin, D. Matvienko, H. Miyata, R. Mizuk, G. B. Mohanty, A. Moll, T. Mori, N. Muramatsu, R. Mussa, E. Nakano, M. Nakao, Z. Natkaniec, M. Nayak, E. Nedelkovska, C. Ng. 2013-06-25. First Observation of Cabibbo-Suppressed \Xi_c^0 Decays. https://doi.org/10.1103/physrevd.88.071103

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