Observation of an isotriplet of excited charmed baryons decaying to Lambda+(c) pi
Dec, 20046 pages
Published in:
- Phys.Rev.Lett. 94 (2005) 122002
e-Print:
- hep-ex/0412069 [hep-ex]
Report number:
- BELLE-PREPRINT-2004-36,
- KEK-PREPRINT-2004-74
Experiments:
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Abstract:
We report the observation of an isotriplet of excited charmed baryons, decaying into Lambda_c+ pi-, Lambda_c+ pi0 and Lambda_c+ pi+. We measure the mass differences M(Lambda_c+ pi)-M(Lambda_c+) and widths to be 515.4 +3.2-3.1 +2.1-6.0 MeV/c^2, 61 +18-13 +22-13 MeV for the neutral state: 505.4 +5.8-4.6 +12.4-2.0 MeV/c^2, 62 +37-23 +52-38 MeV for the charged state and 514.5 +3.4-3.1 +2.8-4.9 MeV/c^2, 75 +18-13 +12-11 MeV for the doubly charged state, where the uncertainties are statistical and systematic, respectively. These results are obtained from a 281 /fb data sample collected with the Belle detector near the Upsilon(4S) resonance, at the KEKB asymmetric energy e+e- collider.- 14.20.Lq
- 13.30.Eg
- electron positron: colliding beams
- electron positron: annihilation
- charmed baryon: hadronic decay
- mass spectrum: (Lambda/c+ pi)
- mass spectrum: mass difference
- new particle: Sigma/c(2800)
- channel cross section: branching ratio
- BELLE
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