ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2006, vol. 96, p. -
Measurements of the absolute branching fractions of B±→ K±Xcc̄
We study the two-body decays of B± mesons to K± and a charmonium state Xcc̄ in a sample of 210.5fb-1 of data from the BABAR experiment. We perform measurements of absolute branching fractions B(B±→K±Xcc̄) using a missing mass technique, and report several new or improved results. In particular, the upper limit B(B±→K±X(3872))<3.2×10-4 at 90% C.L. and the inferred lower limit B(X(3872)→J/ψπ+π-)>4.2% will help in understanding the nature of the recently discovered X(3872). © 2006 The American Physical Society.