Observation of the DecayBc±→J/ψπ±and Measurement of theBc±Mass

T. Aaltonen, J. Adelman, T. Akimoto, M. G. Albrow, B. Álvarez González, S. Amerio, D. Amidei, A. Anastassov, A. Annovi, J. Antos, M. Aoki, G. Apollinari (+606 others)
2008 Physical Review Letters  
The B_c^± meson is observed through the decay B_c^±→ J/ψπ^±, in data corresponding to an integrated luminosity of 2.4 fb^-1 recorded by the CDF II detector at the Fermilab Tevatron. A signal of 108±15 candidates is observed, with a significance that exceeds 8 σ. The mass of the B_c^± meson is measured to be 6275.6 ± 2.9 (stat.) ± 2.5 (syst.) MeV/c^2.
doi:10.1103/physrevlett.100.182002 pmid:18518365 fatcat:6fpqy4wmmneapcn66pm5r5jbjm