Actions for Model independent measurement of S-wave K- pi+ systems using D+ ---> K pi pi decays from Fermilab E791 [electronic resource].

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Model independent measurement of S-wave K- pi+ systems using D+ ---> K pi pi decays from Fermilab E791 [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 2005.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
21 pages : digital, PDF file
Additional Creators
Fermi National Accelerator Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
A model-independent partial-wave analysis of the S-wave component of the Kπ system from decays of D⁺ mesons to the three-body K⁻π⁺π⁺ final state is described. Data come from the Fermilab E791 experiment. Amplitude measurements are made independently for ranges of K⁻π⁺ invariant mass, and results are obtained below 825 MeV/c², 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, optimized to describe the data used, is required. The observed phase variation for the S-, P- and D-waves do not match existing measurements of I = 1/2 K⁻ π⁺ 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, does not apply to these decays. The production rate of K⁻π⁺ 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/c². These measurements can provide a relatively model-free basis for future attempts to determine which strange scalar amplitudes contribute to the decays.
Report Numbers
E 1.99:fermilab-pub-05-336-e
fermilab-pub-05-336-e
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Note
Published through SciTech Connect.
07/01/2005.
"fermilab-pub-05-336-e"
"arXiv eprint number hep-ex/0507099"
Physical Review, D (Particles Fields) 73 ISSN 0556-2821; PRVDAQ FT
Appel, J.A.; Carter, T.; Fernandez, A.; Banerjee, S.; Fox, G.F.; Burchat, P.R.; Denisenko, K.; Blaylock, G.; Copty, N.K.; Gagnon, P.; Ashery, D.; Darling, C.; Aitala, E.M.; Amato, S.; Anjos, J.C.; Bediaga, I.; Bracker, S.B.; Burnstein, R.A.; Cremaldi, L.M.; Devmal, S.; Carvalho, H.S.
Funding Information
AC02-76CH03000
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