Observation of Ξ ( 1620 ) 0 and Evidence for Ξ ( 1690 ) 0 in Ξ c + → Ξ − π + π + Decays

We report the first observation of the double strange baryon Ξ(1620)0 in its decay to Ξ−π+ via Ξ+c → Ξ−π+π+ decays based on a 980 fb−1 data sample collected with the Belle detector at the KEKB asymmetric-energy e+e− collider. The mass and width are measured to be 1610.4 ± 6.0(stat)+6.1−4.2(syst) MeV...

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Veröffentlicht in:Physical review letters 2019-02, Vol.122 (7), p.072501, Article 072501
Hauptverfasser: Sumihama, M., Adachi, I., Ahn, J. K., Aihara, H., Al Said, S., Asner, D. M., Atmacan, H., Aushev, T., Ayad, R., Babu, V., Badhrees, I., Bahinipati, S., Bakich, A. M., Bansal, V., Beleño, C., Berger, M., Bhardwaj, V., Bhuyan, B., Bilka, T., Biswal, J., Bonvicini, G., 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., Choudhury, S., Cinabro, D., Cunliffe, S., Czank, T., Dash, N., Di Carlo, S., Doležal, Z., Dong, T. V., Drásal, Z., Eidelman, S., Epifanov, D., Fast, J. E., Fulsom, B. G., Garg, R., Gaur, V., Gabyshev, N., Garmash, A., Gelb, M., Giri, A., Goldenzweig, P., Guido, E., Haba, J., Hayasaka, K., Hayashii, H., Hirose, S., Hou, W.-S., Inami, K., Inguglia, G., Ishikawa, A., Itoh, R., Iwasaki, M., Iwasaki, Y., Jacobs, W. W., Jeon, H. B., Jia, S., Jin, Y., Joo, K. K., Julius, T., Kaliyar, A. B., Kang, K. H., Karyan, G., Kato, Y., Kiesling, C., Kim, D. Y., Kim, J. B., Kim, K. T., Kim, S. H., Kinoshita, K., Kodyš, P., Korpar, S., Kotchetkov, D., Križan, P., Kroeger, R., Krokovny, P., Kumar, R., Kuzmin, A., Kwon, Y.-J., Lange, J. S., Lee, I. S., Lee, S. C., Li, L. K., Li, Y. B., Li Gioi, L., Libby, J., Liventsev, D., Lubej, M., Luo, T., Masuda, M.
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Sprache:eng
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Zusammenfassung:We report the first observation of the double strange baryon Ξ(1620)0 in its decay to Ξ−π+ via Ξ+c → Ξ−π+π+ decays based on a 980 fb−1 data sample collected with the Belle detector at the KEKB asymmetric-energy e+e− collider. The mass and width are measured to be 1610.4 ± 6.0(stat)+6.1−4.2(syst) MeV /c2 and 59.9 ± 4.8(stat)+2.8−7.1(syst) MeV, respectively. We obtain 4.0σ evidence of the Ξ(1690)0 with the same data sample. These results shed light on the structure of hyperon resonances with strangeness S = −2
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.122.072501