Study of electromagnetic decays of orbitally excited $\Xi_c$ baryons - INSPIRE

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Study of electromagnetic decays of orbitally excited $\Xi_c$ baryons

Belle

Collaboration

•

J. Yelton
(
- Florida U.
)

Sep 8, 2020

8 pages

Published in:

Phys.Rev.D 102 (2020) 7, 071103

Published: Oct 27, 2020

e-Print:

2009.03951 [hep-ex]

DOI:

10.1103/PhysRevD.102.071103

PDG:

{{\mathit \Xi}_{{{c}}}{(2815)}}

\rightarrow

{{\mathit \Xi}_{{{c}}}{(2645)}}{{\mathit \pi}}

Report number:

Belle Preprint 2019-07 KEK Prepint 2020-6

Experiments:

KEK-BF-BELLE

View in:

ADS Abstract Service

reference search21 citations

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Abstract: (APS)

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 Ξc(2790) and Ξc(2815). A clear signal (8.6 standard deviations) is observed for Ξc(2815)0→Ξc0γ, and we measure: B[Ξc(2815)0 → Ξc0γ]B[Ξc(2815)0 → Ξc(2645)+π- → Ξc0π+π-]=0.41±0.05±0.03. We also present evidence (3.8 standard deviations) for the similar decay of the Ξc(2790)0 and measure: B[Ξc(2790)0 → Ξc0γ]B[Ξc(2790)0 → Ξc′+π- → Ξc+γπ-]=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 Ξc(2815)+ and Ξc(2790)+ baryons and set upper limits at the 90% confidence level of: B[Ξc(2815)+ → Ξc+γ]B[Ξc(2815)+ → Ξc(2645)0π+ → Ξc+π-π+]<0.09, and B[Ξc(2790)+ → Ξc+γ]B[Ξc(2790)+ → Ξc′0π+ → Ξc0γπ+]<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.

Note:

Submitted to Phys. Rev. D (Rapid Communications)

electron positron: annihilation
electron positron: colliding beams
electromagnetic decay
charmed baryon: excited state
Xi/c(2790): branching ratio
Xi/c(2815): branching ratio
branching ratio: ratio: measured
Xi/c(2815): radiative decay
baryon
BELLE

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