Study of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>B</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:mo>→</mml:mo><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi><mml:msup><mml:mi>K</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math>decay and measurement of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>B</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:mo>→</mml:mo><mml:mi>X</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>3872</mml:mn><mml:mo stretchy="false">)</mml:mo><mml:msup><mml:mi>K</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math>branching fraction

We study the decay B--&amp;gt; J/psi K(-)pi(+)pi(-) using 117x10(6) B (B) over bar 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--&amp;gt; J/psi K(-)pi(+)pi(-))=(116 +/- 7(stat.)+/- 9(syst.))x10(-5) and B (B--&amp;gt; X(3872)K-)x B (X(3872)-&amp;gt; J/psi pi(+)pi(-))=(1.28 +/- 0.41)x10(-5) and find the mass of the X(3872) to be 3873.4 +/- 1.4 MeV/c(2). We search for the h(c) narrow state in the decay B--&amp;gt; h(c)K(-), h(c)-&amp;gt; J/psi pi(+)pi(-) and for the decay B--&amp;gt; J/psi D(0)pi(-), with D-0-&amp;gt; K(-)pi(+). We set the 90% C.L. limits B(B--&amp;gt; h(c)K(-))xB(h(c)-&amp;gt; J/psi pi(+)pi(-))&amp;lt; 3.4x10(-6) and B(B--&amp;gt; J/psi D(0)pi(-)) &amp;lt; 5.2x10(-5).