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  • First determination of the ...
    Moon, T. J.; Tanida, K.; Ahn, J. K.; Al Said, S.; Ayad, R.; Babu, V.; Behera, P.; Bessner, M.; Bhuyan, B.; Bozek, A.; Browder, T. E.; Červenkov, D.; Chang, P.; Cheon, B. G.; Chilikin, K.; Choi, Y.; Cinabro, D.; Cunliffe, S.; De Nardo, G.; Doležal, Z.; Dong, T. V.; Eidelman, S.; Ferber, T.; Fulsom, B. G.; Garmash, A.; Hadjivasiliou, C.; Hayashii, H.; Hou, W.-S.; Hsu, C.-L.; Inguglia, G.; Iwasaki, M.; Iwasaki, Y.; Jia, S.; Karyan, G.; Kawasaki, T.; Kichimi, H.; Kiesling, C.; Kim, B. H.; Kim, K. T.; Kim, S. H.; Kim, Y. J.; Kim, Y.-K.; Kodyš, P.; Korpar, S.; Kroeger, R.; Krokovny, P.; Kuhr, T.; Kumar, R.; Kuzmin, A.; Kwon, Y.-J.; Lee, I. S.; Liptak, Z.; Liventsev, D.; Luo, T.; MacQueen, C.; Masuda, M.; Merola, M.; Miyata, H.; Mori, T.; Mussa, R.; Nakao, M.; Natkaniec, Z.; Natochii, A.; Nayak, M.; Nisar, N. K.; Ogawa, K.; Pardi, S.; Park, S.-H.; Patra, S.; Piilonen, L. E.; Prencipe, E.; Rout, N.; Russo, G.; Sahoo, D.; Sangal, A.; Sevior, M. E.; Shapkin, M.; Shen, C. P.; Shiu, J.-G.; Shwartz, B.; Solovieva, E.; Sumisawa, K.; Sutcliffe, W.; Takizawa, M.; Tamponi, U.; Uehara, S.; Uglov, T.; Vahsen, S. E.; Varner, G.; Vorobyev, V.; Vossen, A.; Wang, C. H.; Wang, M.-Z.; Wang, P.; Wehle, S.; Wiechczynski, J.; Xu, X.; Yabsley, B. D.; Ye, H.; Yuan, C. Z.

    Physical review. D, 06/2021, Letnik: 103, Številka: 11
    Journal Article

    We report results from a study of the spin and parity of Ξ c ( 2970 ) + using a 980 fb −1 data sample collected by the Belle detector at the KEKB asymmetric-energy e+e− collider. The decay angle distributions in the chain Ξc (2970)+→ Ξc (2645) 0π+ → Ξ+c π− π+ are analyzed to determine the spin of this charmed-strange baryon. The angular distributions strongly favor the Ξc (2970)+ spin J = 1/2 over 3/2 or 5/2, under an assumption that the lowest partial wave dominates in the decay. We also measure the ratio of Ξc (2970)+ decay branching fractions R = B Ξc (2970)+ → Ξc (2645)0π+/B Ξc (2970)+ → Ξ0c π+ = 1.67 ± 0.29 (stat)+0.15 −0.09 (syst) ± 0.25 (IS), where the last uncertainty is due to possible isospin-symmetry-breaking effects. This R value favors the spin-parity J P = 1/2+ with the spin of the light-quark degrees of freedom sl = 0. This is the first determination of the spin and parity of a charmed-strange baryon.