Study of electromagnetic decays of orbitally excited Xi(c) baryons

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F20%3A10423584" target="_blank" >RIV/00216208:11320/20:10423584 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=2h8jcutKrR" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=2h8jcutKrR</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevD.102.071103" target="_blank" >10.1103/PhysRevD.102.071103</a>

Result language
angličtina
Original language name
Study of electromagnetic decays of orbitally excited Xi(c) baryons
Original language description
Using 980 fb(-1) of data collected with the Belle detector operating at the KEKB asymmetric-energy e(+) e(-) collider, we report a study of the electromagnetic decays of excited charmed baryons Xi(c)(2790) and Xi(c)(2815). A clear signal (8.6 standard deviations) is observed for Xi(c)(2815)(0) -> Xi(0)(c)gamma, and we measure: B[Xi(c)(2815)(0) -> Xi(0)(c)gamma]/B[Xi(c)(2815)(0) -> Xi(c)(2645)(+)pi(-) -> Xi(0)(c)pi(+)pi(-)] = - 0.41 +/- 0.05 +/- 0.03. We also present evidence (3.8 standard deviations) for the similar decay of the Xi(c)(2790)(0) and measure:B[Xi(c)(2790)(0) -> Xi(0)(c)gamma]/B[Xi(c)(2790)(0) -> Xi(c)'(+)pi(-) -> Xi(+)(c)gamma pi(-)] = 0.13 +/- 0.03 +/- 0.02. The first quoted uncertainties are statistical and the second systematic. We find no hint of the analogous decays of the Xi(c)(2815)(+) and Xi(c)(2790)(+) baryons and set upper limits at the 90% confidence level of: B[Xi(c)(2815)(0) -> Xi(0)(c)gamma]/B[Xi(c)(2815)(0) -> Xi(c)(2645)(0)pi(+) -> Xi(+)(c)pi(-)pi(+)] < 0.09, and B[Xi(c)(2790)(+) -> Xi(0)(c)gamma]/B[Xi(c)(2815)(+) -> Xi(c)'(0)pi(+) -> Xi(0)(c)gamma pi(+)] < 0.06. Approximate values of the partial widths of the decays are extracted, which can be used to discriminate between models of the underlying quark structure of these excited states.
Czech name
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Czech description
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Type
Jimp - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10303 - Particles and field physics

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

Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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