<span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>π</mi><mrow><mrow><mover><mrow><mi>π</mi></mrow><mrow><mo>→</mo></mrow></mover></mrow></mrow><mi>π</mi><mi>π</mi></math></span> cross sections near threshold

The CHAOS Collaboration; M. Kermani; O. Patarakin; G. R. Smith; P. A. Amaudruz; F. Bonutti; J. T. Brack; P. Camerini; L. Felawka; E. Fragiacomo; E. F. Gibson; N. Grion; G. J. Hofman; E. L. Mathie; S. McFarland; R. Meier; D. Ottewell; K. J. Raywood; R. Rui; M. E. Sevior; R. Tacik; V. Mayorov; V. Tikhonov

doi:10.1103/PhysRevC.58.3431

$π \vec{π} π π$ cross sections near threshold

M. Kermani, O. Patarakin, G. R. Smith, P. A. Amaudruz, F. Bonutti, J. T. Brack, P. Camerini, L. Felawka, E. Fragiacomo, E. F. Gibson, N. Grion, G. J. Hofman, E. L. Mathie, S. McFarland, R. Meier, D. Ottewell, K. J. Raywood, R. Rui, M. E. Sevior, R. Tacik, V. Mayorov, and V. Tikhonov (The CHAOS Collaboration)

Phys. Rev. C 58, 3431 – Published 1 December 1998

Abstract

An analysis of new data for the reaction $π^{\pm} \vec{p} π^{\pm} π^{+} n$ at incident energies between 223 and 284 MeV is presented. $π^{+} π^{-}$ cross sections are obtained via Goebel-Chew-Low techniques by extrapolation to the pion pole using the pseudoperipheral approximation. A consistency check between the present experimental results and previous experiments at higher energies is made using Roy equations. The isospin 0, S-wave $π π$ scattering length was obtained using a variety of methods. The result obtained from a threshold expansion is $a_{0}^{0} = 0.204 \pm 0.014$ (statistical) $\pm 0.008$ (systematic) in inverse pion mass units. It is shown that there are significant differences between the reaction mechanisms for the $(π^{-} π^{+})$ and $(π^{+} π^{+})$ channels.

Received 3 June 1998

DOI:https://doi.org/10.1103/PhysRevC.58.3431

Authors & Affiliations

M. Kermani¹, O. Patarakin², G. R. Smith^5,*, P. A. Amaudruz⁵, F. Bonutti^3,4, J. T. Brack^5,†, P. Camerini^3,4, L. Felawka⁵, E. Fragiacomo^3,4, E. F. Gibson⁶, N. Grion³, G. J. Hofman^1,†, E. L. Mathie⁷, S. McFarland¹, R. Meier^5,‡, D. Ottewell⁵, K. J. Raywood¹, R. Rui^3,4, M. E. Sevior⁸, R. Tacik⁷, V. Mayorov², and V. Tikhonov² (The CHAOS Collaboration)

¹Physics Department, University of British Columbia, Vancouver, British Columbia, Canada V6T 2A6
²General and Nuclear Physics Institute, RRC Kurchatov Institute, Moscow 123182, Russia
³Istituto Nazionale di Fisica Nucleare, 34127 Trieste, Italy
⁴Dipartimento di Fisica dell’Universita’ di Trieste, 34127 Trieste, Italy
⁵TRIUMF, Vancouver, British Columbia, Canada V6T 2A3
⁶California State University, Sacramento, California 95819
⁷University of Regina, Regina, Saskatchewan, Canada S4S 0A2
⁸School of Physics, University of Melbourne, Parkville, Victoria, 3052, Australia

^*Corresponding author. Electronic address: smith@triumf.ca
^†Present address: University of Colorado, Boulder, CO 80309.
^‡Present address: Physikalisches Institut, Universität Tübingen, 72076 Tübingen, Germany.

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Vol. 58, Iss. 6 — December 1998

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