Measurements of the absolute branching fractions of B+/- --> K+/-X(cc)

Phys Rev Lett. 2006 Feb 10;96(5):052002. doi: 10.1103/PhysRevLett.96.052002. Epub 2006 Feb 8.

Abstract

We study the two-body decays of B+/- mesons to K+/- and a charmonium state X(cc) in a sample of 210.5 fb(-1) of data from the BABAR experiment. We perform measurements of absolute branching fractions beta(B+/- --> K+/-X(cc)) using a missing mass technique, and report several new or improved results. In particular, the upper limit beta(B+/- --> K+/- X(3872)) < 3.2 x 10(-4) at 90% C.L. and the inferred lower limit beta(X(3872)J/psipi+ pi-) > 4.2% will help in understanding the nature of the recently discovered X(3872).