We report on our search for decays proceeding via a tree-level b -> c quark transition in which a gluon radiates into an s (s) over bar pair. We present observations of the decays B(-)-> D(s)(*)(+)K(-) pi(-) and (B) over bar (0) -> D(s)(+)K(S)(0)pi(-) and evidence for B(-)-> D(s)(+) K(-) K(-) and set upper limits on the branching fractions for (B) over bar (0) -> D(s)(*+)K(S)(0) pi(-) and B(-) -> D(s)(*+)K(-) K(-) using 383 x 10(6) gamma(4S)-> B (B) over bar events collected by the BABAR detector at SLAC. We present evidence that the invariant mass distributions of D(s)((*)+)K(-) pairs from B(-) -> D(s)(*)(+)K(-)pi(-) decays are inconsistent with the phase-space model, suggesting the presence of charm resonances lying below the D(s)(*)(+) K(-) threshold.
Observation of tree-level B decays with s(s)over-bar production from gluon radiation
Baracchini E;Ferroni F;
2008-01-01
Abstract
We report on our search for decays proceeding via a tree-level b -> c quark transition in which a gluon radiates into an s (s) over bar pair. We present observations of the decays B(-)-> D(s)(*)(+)K(-) pi(-) and (B) over bar (0) -> D(s)(+)K(S)(0)pi(-) and evidence for B(-)-> D(s)(+) K(-) K(-) and set upper limits on the branching fractions for (B) over bar (0) -> D(s)(*+)K(S)(0) pi(-) and B(-) -> D(s)(*+)K(-) K(-) using 383 x 10(6) gamma(4S)-> B (B) over bar events collected by the BABAR detector at SLAC. We present evidence that the invariant mass distributions of D(s)((*)+)K(-) pairs from B(-) -> D(s)(*)(+)K(-)pi(-) decays are inconsistent with the phase-space model, suggesting the presence of charm resonances lying below the D(s)(*)(+) K(-) threshold.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
