Study of electromagnetic decays of orbitally excited Xi(c) baryons
- Title
- Study of electromagnetic decays of orbitally excited Xi(c) baryons
- Author
- 천병구
- Issue Date
- 2020-10
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW D, v. 102, no. 7, article no. 071103
- Abstract
- 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.
- URI
- https://journals.aps.org/prd/abstract/10.1103/PhysRevD.102.071103https://repository.hanyang.ac.kr/handle/20.500.11754/171152
- ISSN
- 2470-0010; 2470-0029
- DOI
- 10.1103/PhysRevD.102.071103
- Appears in Collections:
- COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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