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Title: Role of {pi}{pi} S-wave in CLEO D 3-body decays

Abstract

D meson 3-body hadronic decay data in the past were analyzed with Breit-Wigner amplitude fits. However, the complicated dynamics of the final states is known from previous studies to be poorly described by Breit-Wigner models. This short paper discusses work within CLEO to use coupled channel techniques to describe these decays.

Authors:
 [1]
  1. Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260 (United States)
Publication Date:
OSTI Identifier:
20798149
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 814; Journal Issue: 1; Conference: 11. international conference on hadron spectroscopy, Rio de Janeiro (Brazil), 21-26 Aug 2005; Other Information: DOI: 10.1063/1.2176558; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; AMPLITUDES; BREIT-WIGNER FORMULA; CESR STORAGE RING; COUPLED CHANNEL THEORY; D MESONS; HADRONIC PARTICLE DECAY; MULTIPARTICLE SPECTROMETERS; PARTICLE IDENTIFICATION; PION-PION INTERACTIONS; PIONS; S WAVES

Citation Formats

Dytman, S. A. Role of {pi}{pi} S-wave in CLEO D 3-body decays. United States: N. p., 2006. Web. doi:10.1063/1.2176558.
Dytman, S. A. Role of {pi}{pi} S-wave in CLEO D 3-body decays. United States. doi:10.1063/1.2176558.
Dytman, S. A. Sat . "Role of {pi}{pi} S-wave in CLEO D 3-body decays". United States. doi:10.1063/1.2176558.
@article{osti_20798149,
title = {Role of {pi}{pi} S-wave in CLEO D 3-body decays},
author = {Dytman, S. A.},
abstractNote = {D meson 3-body hadronic decay data in the past were analyzed with Breit-Wigner amplitude fits. However, the complicated dynamics of the final states is known from previous studies to be poorly described by Breit-Wigner models. This short paper discusses work within CLEO to use coupled channel techniques to describe these decays.},
doi = {10.1063/1.2176558},
journal = {AIP Conference Proceedings},
number = 1,
volume = 814,
place = {United States},
year = {Sat Feb 11 00:00:00 EST 2006},
month = {Sat Feb 11 00:00:00 EST 2006}
}
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  • A model-independent partial-wave analysis of the S-wave component of the K{pi} system from decays of D{sup +} mesons to the three-body K{sup -}{pi}{sup +}{pi}{sup +} final state is described. Data come from the Fermilab E791 experiment. Amplitude measurements are made independently for ranges of K{sup -}{pi}{sup +} invariant mass, and results are obtained below 825 MeV/c{sup 2}, where previous measurements exist only in two mass bins. This method of parametrizing a three-body decay amplitude represents a new approach to analyzing such decays. Though no model is required for the S-wave, a parametrization of the relatively well-known reference P- and D-waves,more » optimized to describe the data used, is required. In this paper, a Breit-Wigner model is adopted to describe the resonances in these waves. The observed phase variation for the S-, P-, and D-waves do not match existing measurements of I=(1/2) K{sup -}{pi}{sup +} scattering in the invariant mass range in which scattering is predominantly elastic. If the data are mostly I=(1/2), this observation indicates that the Watson theorem, which requires these phases to have the same dependence on invariant mass, may not apply to these decays without allowing for some interaction with the other pion. The production rate of K{sup -}{pi}{sup +} from these decays, if assumed to be predominantly I=(1/2), is also found to have a significant dependence on invariant mass in the region above 1.25 GeV/c{sup 2}. These measurements can provide a relatively model-free basis for future attempts to determine which strange scalar amplitudes contribute to the decays.« less
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