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arXiv · 1404.5389

Measurements of the masses and widths of the $Σ_{c}(2455)^{0/++}$ and $Σ_{c}(2520)^{0/++}$ baryons

Belle Collaboration·S. -H. Lee·B. R. Ko·E. Won·A. Abdesselam·I. Adachi·H. Aihara·D. M. Asner·T. Aushev·R. Ayad·A. M. Bakich·A. Bala·V. Bansal·V. Bhardwaj·B. Bhuyan·G. Bonvicini·A. Bozek·T. E. Browder·D. Červenkov·A. Chen·B. G. Cheon·R. Chistov·K. Cho·V. Chobanova·S. -K. Choi·Y. Choi·D. Cinabro·J. Dalseno·M. Danilov·Z. Doležal·Z. Drásal·A. Drutskoy·S. Eidelman·D. Epifanov·H. Farhat·J. E. Fast·T. Ferber·A. Frey·V. Gaur·N. Gabyshev·S. Ganguly·A. Garmash·R. Gillard·Y. M. Goh·B. Golob·H. Hayashii·X. H. He·Y. Hoshi·H. J. Hyun·T. Iijima·A. Ishikawa·R. Itoh·Y. Iwasaki·T. Iwashita·I. Jaegle·T. Julius·J. H. Kang·T. Kawasaki·C. Kiesling·B. H. Kim·D. Y. Kim·J. B. Kim·J. H. Kim·M. J. Kim·K. Kinoshita·J. Klucar·P. Kodyš·S. Korpar·P. Križan·P. Krokovny·T. Kuhr·T. Kumita·Y. -J. Kwon·J. S. Lange·Y. Li·L. Li Gioi·J. Libby·D. Liventsev·D. Matvienko·K. Miyabayashi·H. Miyata·A. Moll·T. Mori·R. Mussa·Y. Nagasaka·E. Nakano·M. Nakao·M. Nayak·E. Nedelkovska·N. K. Nisar·S. Nishida·O. Nitoh·S. Ogawa·S. Okuno·P. Pakhlov·G. Pakhlova·H. K. Park·T. K. Pedlar·T. Peng·R. Pestotnik
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Abstract

We present measurements of the masses and decay widths of the baryonic states $Σ_{c}(2455)^{0/++}$ and $Σ_{c}(2520)^{0/++}$ using a data sample corresponding to an integrated luminosity of 711 fb$^{-1}$ collected with the Belle detector at the KEKB $e^{+}e^{-}$ asymmetric-energy collider operating at the $Υ(4S)$ resonance. We report the mass differences with respect to the $Λ_{c}^{+}$ baryon $M(Σ_{c}(2455)^{0})-M(Λ_{c}^{+}) = 167.29\pm0.01\pm0.02$ MeV/$c^{2}$, $M(Σ_{c}(2455)^{++})-M(Λ_{c}^{+}) = 167.51\pm0.01\pm0.02$ MeV/$c^{2}$, $M(Σ_{c}(2520)^{0})-M(Λ_{c}^{+}) = 231.98\pm0.11\pm0.04$ MeV/$c^{2}$, $M(Σ_{c}(2520)^{++})-M(Λ_{c}^{+}) = 231.99\pm0.10\pm0.02$ MeV/$c^{2}$, and the decay widths $Γ(Σ_{c}(2455)^{0}) = 1.76\pm0.04^{+0.09}_{-0.21}$ MeV/$c^{2}$, $Γ(Σ_{c}(2455)^{++}) = 1.84\pm0.04^{+0.07}_{-0.20}$ MeV/$c^{2}$, $Γ(Σ_{c}(2520)^{0}) = 15.41\pm0.41^{+0.20}_{-0.32}$ MeV/$c^{2}$, $Γ(Σ_{c}(2520)^{++}) = 14.77\pm0.25^{+0.18}_{-0.30}$ MeV/$c^{2}$, where the first uncertainties are statistical and the second are systematic. The isospin mass splittings are measured to be $M(Σ_{c}(2455)^{++})-M(Σ_{c}(2455)^{0})=0.22\pm0.01\pm0.01$ MeV/$c^{2}$ and $M(Σ_{c}(2520)^{++})-M(Σ_{c}(2520)^{0})=0.01\pm0.15\pm0.03$ MeV/$c^{2}$. These results are the most precise to date.

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Belle Collaboration, S. -H. Lee, B. R. Ko, E. Won, A. Abdesselam, I. Adachi, H. Aihara, D. M. Asner, T. Aushev, R. Ayad, A. M. Bakich, A. Bala, V. Bansal, V. Bhardwaj, B. Bhuyan, G. Bonvicini, A. Bozek, T. E. Browder, D. Červenkov, A. Chen, B. G. Cheon, R. Chistov, K. Cho, V. Chobanova, S. -K. Choi, Y. Choi, D. Cinabro, J. Dalseno, M. Danilov, Z. Doležal, Z. Drásal, A. Drutskoy, S. Eidelman, D. Epifanov, H. Farhat, J. E. Fast, T. Ferber, A. Frey, V. Gaur, N. Gabyshev, S. Ganguly, A. Garmash, R. Gillard, Y. M. Goh, B. Golob, H. Hayashii, X. H. He, Y. Hoshi, H. J. Hyun, T. Iijima, A. Ishikawa, R. Itoh, Y. Iwasaki, T. Iwashita, I. Jaegle, T. Julius, J. H. Kang, T. Kawasaki, C. Kiesling, B. H. Kim, D. Y. Kim, J. B. Kim, J. H. Kim, M. J. Kim, K. Kinoshita, J. Klucar, P. Kodyš, S. Korpar, P. Križan, P. Krokovny, T. Kuhr, T. Kumita, Y. -J. Kwon, J. S. Lange, Y. Li, L. Li Gioi, J. Libby, D. Liventsev, D. Matvienko, K. Miyabayashi, H. Miyata, A. Moll, T. Mori, R. Mussa, Y. Nagasaka, E. Nakano, M. Nakao, M. Nayak, E. Nedelkovska, N. K. Nisar, S. Nishida, O. Nitoh, S. Ogawa, S. Okuno, P. Pakhlov, G. Pakhlova, H. K. Park, T. K. Pedlar, T. Peng, R. Pestotnik. 2014-04-22. Measurements of the masses and widths of the $Σ_{c}(2455)^{0/++}$ and $Σ_{c}(2520)^{0/++}$ baryons. https://arxiv.org/abs/1404.5389

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