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Title: Study of the D{sup 0}{yields}{pi}{sup -}{pi}{sup +}{pi}{sup -}{pi}{sup +} decay

Abstract

Using data from the FOCUS (E831) experiment at Fermilab, we present new measurements for the Cabibbo-suppressed decay mode D{sup 0}{yields}{pi}{sup -}{pi}{sup +}{pi}{sup -}{pi}{sup +}. We measure the branching ratio {gamma}(D{sup 0}{yields}{pi}{sup +}{pi}{sup -}{pi}{sup +}{pi}{sup -})/{gamma}(D{sup 0}{yields}K{sup -}{pi}{sup +}{pi}{sup -}{pi}{sup +})= =0.0914{+-}0.0018{+-}0.0022. An amplitude analysis has been performed, a first for this channel, in order to determine the resonant substructure of this decay mode. The dominant component is the decay D{sup 0}{yields}a{sub 1}(1260){sup +}{pi}{sup -}, accounting for 60% of the decay rate. The second most dominant contribution comes from the decay D{sup 0}{yields}{rho}(770){sup 0}{rho}(770){sup 0}, with a fraction of 25%. We also study the a{sub 1}(1260) line shape and resonant substructure. Using the helicity formalism for the angular distribution of the decay D{sup 0}{yields}{rho}(770){sup 0}{rho}(770){sup 0}, we measure a longitudinal polarization of P{sub L}=(71{+-}4{+-}2)%.

Authors:
; ;  [1];  [2];  [3];  [4]
  1. University of California, Davis, California 95616 (United States)
  2. (Brazil) and CINVESTAV, 07000 Mexico City, DF (Mexico) and University of Colorado, Boulder, Colorado 80309 (United States) and Fermi National Accelerator Laboratory, Batavia, Illinois 60510 (United States)
  3. (Italy)
  4. (Mexico) (and others)
Publication Date:
OSTI Identifier:
21020039
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 5; Other Information: DOI: 10.1103/PhysRevD.75.052003; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; A1-1260 MESONS; ANGULAR DISTRIBUTION; BRANCHING RATIO; D NEUTRAL MESONS; FERMILAB; HELICITY; KAONS MINUS; MULTIPARTICLE SPECTROMETERS; PARTICLE DECAY; PARTICLE IDENTIFICATION; PIONS MINUS; PIONS PLUS; POLARIZATION; RHO-770 MESONS

Citation Formats

Link, J. M., Yager, P. M., Anjos, J. C., Centro Brasileiro de Pesquisas Fisicas, Rio de Janeiro, RJ, Laboratori Nazionali di Frascati dell'INFN, Frascati I-00044, and University of Guanajuato, 37150 Leon, Guanajuato. Study of the D{sup 0}{yields}{pi}{sup -}{pi}{sup +}{pi}{sup -}{pi}{sup +} decay. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.052003.
Link, J. M., Yager, P. M., Anjos, J. C., Centro Brasileiro de Pesquisas Fisicas, Rio de Janeiro, RJ, Laboratori Nazionali di Frascati dell'INFN, Frascati I-00044, & University of Guanajuato, 37150 Leon, Guanajuato. Study of the D{sup 0}{yields}{pi}{sup -}{pi}{sup +}{pi}{sup -}{pi}{sup +} decay. United States. doi:10.1103/PHYSREVD.75.052003.
Link, J. M., Yager, P. M., Anjos, J. C., Centro Brasileiro de Pesquisas Fisicas, Rio de Janeiro, RJ, Laboratori Nazionali di Frascati dell'INFN, Frascati I-00044, and University of Guanajuato, 37150 Leon, Guanajuato. Thu . "Study of the D{sup 0}{yields}{pi}{sup -}{pi}{sup +}{pi}{sup -}{pi}{sup +} decay". United States. doi:10.1103/PHYSREVD.75.052003.
@article{osti_21020039,
title = {Study of the D{sup 0}{yields}{pi}{sup -}{pi}{sup +}{pi}{sup -}{pi}{sup +} decay},
author = {Link, J. M. and Yager, P. M. and Anjos, J. C. and Centro Brasileiro de Pesquisas Fisicas, Rio de Janeiro, RJ and Laboratori Nazionali di Frascati dell'INFN, Frascati I-00044 and University of Guanajuato, 37150 Leon, Guanajuato},
abstractNote = {Using data from the FOCUS (E831) experiment at Fermilab, we present new measurements for the Cabibbo-suppressed decay mode D{sup 0}{yields}{pi}{sup -}{pi}{sup +}{pi}{sup -}{pi}{sup +}. We measure the branching ratio {gamma}(D{sup 0}{yields}{pi}{sup +}{pi}{sup -}{pi}{sup +}{pi}{sup -})/{gamma}(D{sup 0}{yields}K{sup -}{pi}{sup +}{pi}{sup -}{pi}{sup +})= =0.0914{+-}0.0018{+-}0.0022. An amplitude analysis has been performed, a first for this channel, in order to determine the resonant substructure of this decay mode. The dominant component is the decay D{sup 0}{yields}a{sub 1}(1260){sup +}{pi}{sup -}, accounting for 60% of the decay rate. The second most dominant contribution comes from the decay D{sup 0}{yields}{rho}(770){sup 0}{rho}(770){sup 0}, with a fraction of 25%. We also study the a{sub 1}(1260) line shape and resonant substructure. Using the helicity formalism for the angular distribution of the decay D{sup 0}{yields}{rho}(770){sup 0}{rho}(770){sup 0}, we measure a longitudinal polarization of P{sub L}=(71{+-}4{+-}2)%.},
doi = {10.1103/PHYSREVD.75.052003},
journal = {Physical Review. D, Particles Fields},
number = 5,
volume = 75,
place = {United States},
year = {Thu Mar 01 00:00:00 EST 2007},
month = {Thu Mar 01 00:00:00 EST 2007}
}