Branching fraction measurement ofB¯0→D(*)+π−andB−→D(*)0π−and isospin analysis ofB¯→D(*)πdecays

B. Aubert, R. Barate, M. Bona, D. Boutigny, F. Couderc, Y. Karyotakis, J. P. Lees, V. Poireau, V. Tisserand, A. Zghiche, E. Grauges, A. Palano (+592 others)
2007 Physical Review D  
Using 65 million Υ(4S)→ BB̅ events collected with the BABAR detector at the PEP-II e^+e^- storage ring at the Stanford Linear Accelerator Center, we measure the color-favored branching fractions B(B̅^̅0̅→ D^+π^-) = (2.55 ± 0.05 ± 0.16)× 10^-3, B(B̅^̅0̅→ D^*+π^-) = (2.79 ± 0.08 ± 0.17)× 10^-3, B(B^-→ D^0π^-) = (4.90 ± 0.07 ± 0.22)× 10^-3 and B(B^-→ D^*0π^-) = (5.52 ± 0.17 ± 0.42)× 10^-3, where the first error is statistical and the second is systematic. With these results and the current world
more » ... the current world average for the branching fraction for the color-suppressed decay B̅^̅0̅→ D^(*)0π^0, the cosines of the strong phase difference δ between the I=1/2 and I=3/2 isospin amplitudes are determined to be cosδ = 0.872^+0.008+0.031_-0.007-0.029 for the B̅→ Dπ process and cosδ = 0.924^+0.019+0.063_-0.017-0.054 for the B̅→ D^*π process. Under the isospin symmetry, the results for cosδ suggest that final-state interactions are present in the Dπ system.
doi:10.1103/physrevd.75.031101 fatcat:bykftuewfrc67gt63wnxj3pcve