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Analysis of the D^+ → K^-π^+e^+ν_e decay channel

del Amo Sanchez, P. and Cheng, C. H. and Doll, D. A. and Echenard, B. and Hitlin, D. G. and Ongmongkolkul, P. and Porter, F. C. and Rakitin, A. Y. (2011) Analysis of the D^+ → K^-π^+e^+ν_e decay channel. Physical Review D, 83 (7). Art. No. 072001. ISSN 2470-0010. https://resolver.caltech.edu/CaltechAUTHORS:20110602-103742212

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Abstract

Using 347.5  fb^(-1) of data recorded by the BABAR detector at the PEP-II electron-positron collider, 244×10^3 signal events for the D^+ → K^-π^+e^+ν_e decay channel are analyzed. This decay mode is dominated by the K̅ ^*(892)^0 contribution. We determine the K̅ ^*(892)^0 parameters: m_(K^*(892)^0)=(895.4±0.2±0.2)  MeV/c^2, Γ_(K^*(892)^0)=(46.5±0.3±0.2)  MeV/c^2, and the Blatt-Weisskopf parameter r_(BW) =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 q^2 = 0 (r_V = ^(V(0))/_(A1(0)) = 1.463 ± 0.017 ± 0.031, r_2 = _(A1(0)) ^(A2(0))= 0.801±0.020±0.020) and the value of the axial-vector pole mass parametrizing the q^2 variation of A_1 and A_2: m_A=(2.63±0.10±0.13)  GeV/c^2. The S-wave fraction is equal to (5.79±0.16±0.15)%. Other signal components correspond to fractions below 1%. Using the D^+ → K^-π^+π^+ channel as a normalization, we measure the D^+ semileptonic branching fraction: B(D^+ → K^-π^+e^+ν_e)=(4.00±0.03±0.04±0.09)×10^(-2), where the third uncertainty comes from external inputs. We then obtain the value of the hadronic form factor A_1 at q^2=0: A_1(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.


Item Type:Article
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http://dx.doi.org/10.1103/PhysRevD.83.072001DOIUNSPECIFIED
http://link.aps.org/doi/10.1103/PhysRevD.83.072001PublisherUNSPECIFIED
http://prd.aps.org/abstract/PRD/v83/i7/e072001PublisherUNSPECIFIED
Additional Information:© 2011 American Physical Society. Received 13 December 2010; published 1 April 2011. The authors would like to thank S. Descotes-Genon and A. Le Yaouanc for fruitful discussions, especially on the charm meson semileptonic decay rate formalism. We also thank V. Bernard, B. Moussallam, and E. Passemar for discussions on chiral perturbation theory and different aspects of the Kπ system. We are grateful for the extraordinary contributions of our PEP-II colleagues in achieving the excellent luminosity and machine conditions that have made this work possible. The success of this project also relies critically on the expertise and dedication of the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and the kind hospitality extended to them. This work is supported by the U.S. Department of Energy and National Science Foundation, the Natural Sciences and Engineering Research Council (Canada), the Commissariat à l’Energie Atomique and Institut National de Physique Nucléaire et de Physique des Particules (France), the Bundesministerium für Bildung und Forschung and Deutsche Forschungsgemeinschaft (Germany), the Istituto Nazionale di Fisica Nucleare (Italy), the Foundation for Fundamental Research on Matter (The Netherlands), the Research Council of Norway, the Ministry of Education and Science of the Russian Federation, Ministerio de Ciencia e Innovaciόn (Spain), and the Science and Technology Facilities Council (United Kingdom). Individuals have received support from the Marie-Curie IEF program (European Union), the A.P. Sloan Foundation (U.S.) and the Binational Science Foundation (U.S.-Israel).
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)UNSPECIFIED
NSFUNSPECIFIED
Natural Science Foundation UNSPECIFIED
Natural Sciences and Engineering Research Council (Canada)UNSPECIFIED
Commissariat à l’Energie Atomique and Institut National de Physique Nucléaire et de Physique des Particules (France)UNSPECIFIED
Bundesministerium für Bildung und Forschung and Deutsche Forschungsgemeinschaft (Germany)UNSPECIFIED
Istituto Nazionale di Fisica Nucleare (Italy)UNSPECIFIED
Foundation for Fundamental Research on Matter (The Netherlands)UNSPECIFIED
Research Council of NorwayUNSPECIFIED
Ministry of Education and Science of the Russian FederationUNSPECIFIED
Ministerio de Educaciόn y Ciencia (Spain)UNSPECIFIED
Science and Technology Facilities Council (United Kingdom)UNSPECIFIED
Marie-Curie EIF program (European Union)UNSPECIFIED
A. P. Sloan Foundation (U.S.)UNSPECIFIED
Binational Science Foundation (U.S.-Israel)UNSPECIFIED
Issue or Number:7
Classification Code:PACS: 13.20.Fc, 11.15.Ha, 11.30.Er, 12.38.Gc
Record Number:CaltechAUTHORS:20110602-103742212
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20110602-103742212
Official Citation:Analysis of the D+→K-π+e+νe decay channel P. del Amo Sanchez et al. (BABAR Collaboration) Published 1 April 2011 (35 pages) 072001
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:23871
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:02 Jun 2011 20:09
Last Modified:03 Oct 2019 02:50

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