pi. sup minus p r arrow. pi. sup 0. pi. sup 0 n near threshold and chiral symmetry breaking

Journal Article · Sun Sep 01 00:00:00 EDT 1991 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.44.956· OSTI ID:5099898

Lowe, J; Bassalleck, B; Burkhardt, H; Fickinger, W J; Hall, J R; Hasinoff, M D; Horvath, D; Koch, G; Larson, K D; Miller, J P; Noble, A; Roberts, B L; Robinson, D K; Sakitt, M; Sevior, M E; Tanner, N W; Waltham, C E; Warner, T M; Wolfe, D M ^[1]

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1. University of Birmingham, Birmingham, B152TT, United Kingdom Boston University, Boston, Massachusetts (USA) University of British Columbia, Vancouver, British Columbia (Canada) Brookhaven National Laboratory, Upton, New York (USA) Case Western Reserve University, Cleveland, Ohio (USA) Central Research Institute for Physics, Budapest (Hungary) University of New Mexico, Albuquerque, New Mexico (USA) University of Nottingham, Nottingham, NG72RD, United Kingdom Oxford University, Oxford, OX13RH, United Kingdom TRIUMF, Vancouver, British Columbia, Canada

Total cross sections, angular, and mass distributions for the reaction {pi}{sup {minus}}{ital p}{r arrow}{pi}{sup 0}{pi}{sup 0}{ital n} have been measured for {ital p}{sub {pi}}{sup {minus}}(lab)=7--140 MeV/{ital c} above threshold. The threshold amplitude was used to determine a value for the chiral-symmetry-breaking parameter, {xi}, of {minus}0.98{plus minus}0.52. The {pi}{pi} scattering lengths {ital a}{sub {ital I}} for isospin {ital I}=0 and 2 are derived from this result, together with a current-algebra sum rule. The results are {ital a}{sub 0}=(0.207{plus minus}0.028){ital m}{sub {pi}}{sup {minus}1} and {ital a}{sub 2}=({minus}0.022{plus minus}0.011){ital m}{sub {pi}}{sup {minus}1}. These values are consistent with chiral symmetry broken by the Weinberg {pi}{pi} interaction and the effects of the {ital f}{sub 0}(975) scalar meson.

• OSTI ID: 5099898
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Vol. 44:3; ISSN 0556-2813
• Country of Publication: United States
• Language: English

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