The B− → D+ K− π− decay is observed in a data sample corresponding to 3.0 fb^−1 of pp collision data recorded by the LHCb experiment during 2011 and 2012. Its branching fraction is measured to be B(B− → D+ K− π−) = (7.31 ± 0.19 ± 0.22 ± 0.39) × 10^−5 where the uncertainties are statistical, systematic and from the branching fraction of the normalization channel B− → D+ π− π−, respectively. An amplitude analysis of the resonant structure of the B− → D+ K− π− decay is used to measure the contributions from quasi-two-body B− → D0∗(2400)0 K−, B− → D2∗(2460)0 K−, and B− → DJ∗(2760)0 K− decays, as well as from nonresonant sources. The DJ∗(2760)0 resonance is determined to have spin 1.
First Observation and Amplitude Analysis of the B− → D+ K− π− Decay
L. Capriotti;CARBONE, ANGELO;GALLI, DOMENICO;MUSSINI, MANUEL;PATRIGNANI, CLAUDIA;PERAZZINI, STEFANO;VAGNONI, VINCENZO MARIA;ZANGOLI, MARIA;
2015
Abstract
The B− → D+ K− π− decay is observed in a data sample corresponding to 3.0 fb^−1 of pp collision data recorded by the LHCb experiment during 2011 and 2012. Its branching fraction is measured to be B(B− → D+ K− π−) = (7.31 ± 0.19 ± 0.22 ± 0.39) × 10^−5 where the uncertainties are statistical, systematic and from the branching fraction of the normalization channel B− → D+ π− π−, respectively. An amplitude analysis of the resonant structure of the B− → D+ K− π− decay is used to measure the contributions from quasi-two-body B− → D0∗(2400)0 K−, B− → D2∗(2460)0 K−, and B− → DJ∗(2760)0 K− decays, as well as from nonresonant sources. The DJ∗(2760)0 resonance is determined to have spin 1.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.