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Phys. Rev. D 71, 071103 (2005) [7 pages]

Study of the B-J/ψK-π+π- decay and measurement of the B-X(3872)K- branching fraction

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B. Aubert et al. BABAR Collaboration
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Received 2 June 2004; published 22 April 2005

We study the decay B-J/ψK-π+π- using 117×106 BB̅ events collected at the Y(4S) resonance with the BABAR detector at the PEP-II e+e- asymmetric-energy storage ring. We measure the branching fractions B (B-J/ψK-π+π-)=(116±7(stat.)±9(syst.))×10-5 and B (B-X(3872)K- B (X(3872)→J/ψπ+π-)=(1.28±0.41)×10-5 and find the mass of the X(3872) to be 3873.4±1.4  MeV/c2. We search for the hc narrow state in the decay B-hcK-, hcJ/ψπ+π- and for the decay B-J/ψD0π-, with D0K-π+. We set the 90% C.L. limits B(B-hcK-B(hcJ/ψπ+π-)<3.4×10-6 and B(B-J/ψD0π-)<5.2×10-5.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.71.071103
DOI:
10.1103/PhysRevD.71.071103
PACS:
13.25.Hw, 11.30.Er, 12.15.Hh