We report on a Dalitz plot analysis of B(-) -> D(+)pi(-)pi(-) decays, based on a sample of about 383 x 10(6) Y(4S) -> B (B) over bar decays collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We find the total branching fraction of the three-body decay: B(B(-) -> D(+) pi(-)pi(-)) = (1.08 +/- 0.03 +/- 0.05) x 10(-3). We observe the established D(2)*(0) and confirm the existence of D(0)*(0) in their decays to D(+)pi(-), where the D(2)*(0) and D(0)*(0) are the 2(+) and 0(+) c (u) over bar P-wave states, respectively. We measure the masses and widths of D(2)*(0) and D(0)*(0) to be: m(D2)*(0) = (2460.4 +/- 1.2 +/- 1.2 +/- 1.9) MeV/c(2), Gamma(D2*0) = (41.8 +/- 2.5 +/- 2.1 +/- 2.0) MeV, m(D0*0) = (2297 +/- 8 +/- 5 +/- 19) MeV/c(2), and Gamma(D0*0) = (273 +/- 12 +/- 17 +/- 45) MeV. The stated errors reflect the statistical and systematic uncertainties, and the uncertainty related to the assumed composition of signal events and the theoretical model.
Dalitz plot analysis of B(-) -> D(+)pi(-)pi(-)
LUSIANI, Alberto;
2009
Abstract
We report on a Dalitz plot analysis of B(-) -> D(+)pi(-)pi(-) decays, based on a sample of about 383 x 10(6) Y(4S) -> B (B) over bar decays collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We find the total branching fraction of the three-body decay: B(B(-) -> D(+) pi(-)pi(-)) = (1.08 +/- 0.03 +/- 0.05) x 10(-3). We observe the established D(2)*(0) and confirm the existence of D(0)*(0) in their decays to D(+)pi(-), where the D(2)*(0) and D(0)*(0) are the 2(+) and 0(+) c (u) over bar P-wave states, respectively. We measure the masses and widths of D(2)*(0) and D(0)*(0) to be: m(D2)*(0) = (2460.4 +/- 1.2 +/- 1.2 +/- 1.9) MeV/c(2), Gamma(D2*0) = (41.8 +/- 2.5 +/- 2.1 +/- 2.0) MeV, m(D0*0) = (2297 +/- 8 +/- 5 +/- 19) MeV/c(2), and Gamma(D0*0) = (273 +/- 12 +/- 17 +/- 45) MeV. The stated errors reflect the statistical and systematic uncertainties, and the uncertainty related to the assumed composition of signal events and the theoretical model.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.