Journal article
Observation ofB±→ψ(2S)π±and search for directCPviolation
V Bhardwaj, R Kumar, JB Singh, I Adachi, H Aihara, K Arinstein, T Aushev, T Aziz, S Bahinipati, AM Bakich, V Balagura, E Barberio, A Bay, K Belous, U Bitenc, A Bondar, A Bozek, M Bračko, J Brodzicka, TE Browder Show all
Physical Review D | American Physical Society (APS) | Published : 2008
Abstract
We report the first observation of B±→ψ(2S)π±, a Cabibbo- and color-suppressed decay. This analysis is based on 657×106 BB¯ events collected at the Υ(4S) resonance with the Belle detector at the KEKB energy-asymmetric e+e- collider. The measured branching fraction is (2.44±0.22±0.20)×10-5 and the charge asymmetry is A=0.022±0.085±0.016. The ratio of the branching fractions B(B±→ψ(2S)π±)/B(B±→ψ(2S)K±)=(3.99±0.36±0.17)% is also determined.