First determination of the spin and parity of the charmed-strange baryon $Xi_{c}(2970)^+$

Moon, T. J.*; Tanida, Kiyoshi ; Belle Collaboration*; 203 of others*

We report results from a study of the spin and parity of $Xi_{c}(2970)^+$ using a $980~mathrm{fb^{-1}}$ data sample collected by the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. The decay angle distributions in the chain $Xi_{c}(2970)^+ to Xi_c(2645)^{0}pi^{+} to Xi_c^{+}pi^{-}pi^{+}$ are analyzed to determine the spin of this charmed-strange baryon. The angular distributions strongly favor the $Xi_{c}(2970)^+$ spin over or , under an assumption that the lowest partial wave dominates in the decay. We also measure the ratio of $Xi_{c}(2970)^+$ decay branching fractions $R={mathcal{B}[ Xi_{c}(2970)^+ to Xi_c(2645)^{0}pi^{+} ]}$ / ${ mathcal{B}[ Xi_{c}(2970)^+ to Xi_c^{prime0}pi^{+} ]}$ =1.67 $pm 0.29mathrm{(stat.)}^{ +0.15}_{-0.09}mathrm{(syst.)}$ , where the last uncertainty is due to possible isospin-symmetry-breaking effects. This value favors the spin-parity with the spin of the light-quark degrees of freedom $s_{l}=0$ . This is the first determination of the spin and parity of a charmed-strange baryon.

Language	:	English
Journal	:	Physical Review D
Volume	:	103
Number	:	11
Pages	:	p.L111101_1 - L111101_9
Publication Year/Month	:	2021/06
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Paper URL	:	https://doi.org/10.1103/PhysRevD.103.L111101
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Keywords	:	hadron spectroscopy
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Article of JAEA R&D Review	:
Cooperating Institute	:	高エネルギー加速器研究機構

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Registration No. : AA20220158
JAEA Abstracts No. : 50000724
Paper Submission No. : 25454

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