We report results from a study of the spin and parity of Ξc(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+→Ξc+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)+→Ξc′0π+]=1.67±0.29(stat)-0.09+0.15(syst)±0.25(IS), where the last uncertainty is due to possible isospin-symmetry-breaking effects. This R value favors the spin-parity JP=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.

First determination of the spin and parity of the charmed-strange baryon Ξc (2970)+ / Moon, T.J., Tanida, K., Kato, Y., Kim, S.K., Adachi, I., Ahn, J.K., Aihara, H., Al Said, S., Asner, D.M., Aulchenko, V., Aushev, T., Ayad, R., Babu, V., Bahinipati, S., Behera, P., Beleno, C., Bennett, J., Bessner, M., Bhuyan, B., Bilka, T., et al.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 103:11(2021). [10.1103/PhysRevD.103.L111101]

First determination of the spin and parity of the charmed-strange baryon Ξc (2970)+

Campajola M.;De Nardo G.;Di Capua F.;Merola M.;Pardi S.;Russo G.;
2021

Abstract

We report results from a study of the spin and parity of Ξc(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+→Ξc+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)+→Ξc′0π+]=1.67±0.29(stat)-0.09+0.15(syst)±0.25(IS), where the last uncertainty is due to possible isospin-symmetry-breaking effects. This R value favors the spin-parity JP=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.
2021
First determination of the spin and parity of the charmed-strange baryon Ξc (2970)+ / Moon, T.J., Tanida, K., Kato, Y., Kim, S.K., Adachi, I., Ahn, J.K., Aihara, H., Al Said, S., Asner, D.M., Aulchenko, V., Aushev, T., Ayad, R., Babu, V., Bahinipati, S., Behera, P., Beleno, C., Bennett, J., Bessner, M., Bhuyan, B., Bilka, T., et al.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 103:11(2021). [10.1103/PhysRevD.103.L111101]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/885389
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