Analysis of the D+Kπ+e+νe decay channel

P. del Amo Sanchez et al. (BABAR Collaboration)
Phys. Rev. D 83, 072001 – Published 1 April 2011

Abstract

Using 347.5fb1 of data recorded by the BABAR detector at the PEP-II electron-positron collider, 244×103 signal events for the D+Kπ+e+νe decay channel are analyzed. This decay mode is dominated by the K¯*(892)0 contribution. We determine the K¯*(892)0 parameters: mK*(892)0=(895.4±0.2±0.2)MeV/c2, ΓK*(892)00=(46.5±0.3±0.2)MeV/c2, and the Blatt-Weisskopf parameter rBW=2.1±0.5±0.5(GeV/c)1, where the first uncertainty comes from statistics and the second from systematic uncertainties. We also measure the parameters defining the corresponding hadronic form factors at q2=0 (rV=V(0)A1(0)=1.463±0.017±0.031, r2=A2(0)A1(0)=0.801±0.020±0.020) and the value of the axial-vector pole mass parametrizing the q2 variation of A1 and A2: mA=(2.63±0.10±0.13)GeV/c2. The S-wave fraction is equal to (5.79±0.16±0.15)%. Other signal components correspond to fractions below 1%. Using the D+Kπ+π+ channel as a normalization, we measure the D+ semileptonic branching fraction: B(D+Kπ+e+νe)=(4.00±0.03±0.04±0.09)×102, where the third uncertainty comes from external inputs. We then obtain the value of the hadronic form factor A1 at q2=0: A1(0)=0.6200±0.0056±0.0065±0.0071. Fixing the P-wave parameters, we measure the phase of the S wave for several values of the Kπ mass. These results confirm those obtained with Kπ production at small momentum transfer in fixed target experiments.

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  • Received 13 December 2010

DOI:https://doi.org/10.1103/PhysRevD.83.072001

© 2011 American Physical Society

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Vol. 83, Iss. 7 — 1 April 2011

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