Journal article

Measurement of masses of the Xi(c)(2645) and Xi(c)(2815) baryons and observation of Xi(c)(2980)->Xi(c)(2645)pi

T Lesiak, I Adachi, H Aihara, K Arinstein, AM Bakich, V Balagura, E Barberio, I Bedny, K Belous, V Bhardwaj, U Bitenc, S Blyth, A Bozek, M Bracko, J Brodzicka, TE Browder, Y Chao, A Chen, WT Chen, BG Cheon Show all

PHYSICS LETTERS B | ELSEVIER SCIENCE BV | Published : 2008

Abstract

We report a precise measurement of the masses of the Ξc (2645) and Ξc (2815) baryons using a data sample of 414 fb-1 collected by the Belle Collaboration at the KEKB e+ e- collider. The states Ξc (2645)0, + are observed in the Ξc+, 0 π-, + decay modes, while the Ξc (2815)0, + are reconstructed in the Ξc (2645)+, 0 π-, + decay modes. The following mass splittings are determined: mΞc (2645)+ - mΞc (2645)0 = (- 0.1 ± 0.3 (stat) ± 0.6 (syst)) MeV / c2 and mΞc (2815)+ - mΞc (2815)0 = (- 3.4 ± 1.9 (stat) ± 0.9 (syst)) MeV / c2 with a much better precision than the current world averages. We also observe a new decay mode, Ξc (2980)0, + → Ξc (2645)+, 0 π-, +. © 2008 Elsevier B.V. All rights reserved..

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