Observation of an Isotriplet of Excited Charmed Baryons Decaying to $Λ_c^+ π$

Details Observation of an Isotriplet of Excited Charmed Baryons Decaying to $Λ_c^+ π$ Observation of an Isotriplet of Excited Charmed Baryons Decaying to $Λ_c^+ π$

2004-12-24

arxiv.org/abs/hep-ex/0412069v2

Phys.Rev.Lett.94:122002,2005

Physics

High Energy Physics

High Energy Physics - Experiment

6 pages, 3 figures, version accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.94.122002

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.

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