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

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F21%3A10439933" target="_blank" >RIV/00216208:11320/21:10439933 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=zaqMBytFqW" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=zaqMBytFqW</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevD.103.L111101" target="_blank" >10.1103/PhysRevD.103.L111101</a>

Result language
angličtina
Original language name
First determination of the spin and parity of the charmed-strange baryon Xi(c) (2970)(+)
Original language description
We report results from a study of the spin and parity of Xi(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 Xi(c)(2970)(+) -> Xi(c) (2645)(0)pi(+) -> 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 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 Xi(c) (2970)(+) decay branching fractions R= B[Xi(c) (2970)(+) -> Xi(c)(2645)(0)(pi)+]/B[Xi(c)(2970)(+) -> Xi('0)(c)pi(+)] 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 J(P) = 1/2(+) 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.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10300 - Physical sciences

Project
<a href="/en/project/LTT17020" target="_blank" >LTT17020: Study of Beyond Standard Model Physics with the International Experiment Belle II in Japan</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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