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We study the decay B- --> J/psi K- pi+ pi- using
117 million BBbar 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
Br(B- --> J/psi K- pi+ pi-) = (116 +- 7 (stat.) +- 9(syst.))* 10-5
and
Br(B- --> X(3872)K-)* Br (X(3872) --> J/psi pi+ pi-) =(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 h_c narrow state in the decay
B- --> h_c K-, h_c --> J/psi pi+ pi- and for the decay
B- --> J/psi D0 pi-, with D0 --> K- pi+.
We set the 90% C.L. limits
Br(B- --> h_c K-)* Br (h_c --> J/psi pi+ pi-) <3.4 * 10-6
and Br(B- --> J/psi D0 pi- ) <5.2 * 10-5.
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