B mesons Particle Symbol Anti-particle Quark content Charge Isospin (I) Spin and parity (JP) Rest mass (MeV/c2) S C B' Mean lifetime (s) Commonly decays to B meson B+ B− u b +1 1/2 0− 5279.29±0.15 0 0 +1 (1.638±0.004)×10−12 See B± decay modes B meson B0 B0 d b 0 1/2 0− 5279.61±0.16 0 0 +1 (1.520±0.004)×10−12 See B0 decay modes Strange B meson B0 s B0 s s b 0 0 0− 5366.79±0.23 −1 0 +1 (1.510±0.005)×10−12 See B0 s decay modes Charmed B meson B+ c B− c c b +1 0 0− 6275.1±1.0 0 +1 +1 (0.507±0.009)×10−12 See B± c decay modes