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Observation of an Excited Charm Baryon Ωc* Decaying to Ωc0γ
- Aubert, B;
- Bona, M;
- Boutigny, D;
- Couderc, F;
- Karyotakis, Y;
- Lees, JP;
- Poireau, V;
- Tisserand, V;
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- Abrams, GS;
- Battaglia, M;
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- Gill, MS;
- Groysman, Y;
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- Kolomensky, Yu G;
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- et al.
Abstract
We report the first observation of an excited singly charmed baryon Omega c* (css) in the radiative decay Omega c0gamma, where the Omega c0 baryon is reconstructed in the decays to the final states Omega(-)pi+, Omega(-)pi+pi0, Omega(-)pi+pi(-)pi+, and Xi(-)K(-)pi+pi+. This analysis is performed using a data set of 230.7 fb(-1) collected by the BABAR detector at the PEP-II asymmetric-energy B factory at the Stanford Linear Accelerator Center. The mass difference between the Omega c* and the Omega c0 baryons is measured to be 70.8+/-1.0(stat)+/-1.1(syst) MeV/c2. We also measure the ratio of inclusive production cross sections of Omega c* and Omega c0 in e+e(-) annihilation.
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