Evidence for the Electromagnetic Production of the <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi>A</mi></mrow><mrow><mn>1</mn></mrow></msub></mrow></math></span>

M. Zielinski; D. Berg; C. Chandlee; S. Cihangir; T. Ferbel; J. Huston; T. Jensen; F. Lobkowicz; T. Ohshima; P. Slattery; P. Thompson; B. Collick; S. Heppelmann; M. Marshak; E. Peterson; K. Ruddick; A. Jonckheere; C. A. Nelson, Jr

doi:10.1103/PhysRevLett.52.1195

Evidence for the Electromagnetic Production of the $A_{1}$

M. Zielinski, D. Berg, C. Chandlee, S. Cihangir, T. Ferbel, J. Huston, T. Jensen, F. Lobkowicz, T. Ohshima, P. Slattery, P. Thompson, B. Collick, S. Heppelmann, M. Marshak, E. Peterson, K. Ruddick, A. Jonckheere, and C. A. Nelson, Jr.

Phys. Rev. Lett. 52, 1195 – Published 2 April 1984

Abstract

Using data on the coherent production of $π^{+} π^{+} π^{-}$ systems in $π^{+}$ collisions with nuclei, we have extracted an estimate for the radiative partial width of the $A_{1}$ . The rate for ${A_{1}}^{+} \to π^{+} γ$ is 640±246 keV, which is a factor of about 2-3 below the value expected on the basis of predictions from quark models and from vector dominance ideas.

Received 3 January 1984

DOI:https://doi.org/10.1103/PhysRevLett.52.1195

Authors & Affiliations

M. Zielinski^*, D. Berg^†, C. Chandlee, S. Cihangir^‡, T. Ferbel, J. Huston, T. Jensen^§, F. Lobkowicz, T. Ohshima^∥, P. Slattery, and P. Thompson^¶

University of Rochester, Rochester, New York 14627

B. Collick, S. Heppelmann, M. Marshak, E. Peterson, and K. Ruddick

University of Minnesota, Minneapolis, Minnesota 55455

A. Jonckheere and C. A. Nelson, Jr.

Fermi National Accelerator Laboratory, Batavia, Illinois 60510

^*Present address: Jagellonian University, Krakow, Poland.
^†Present address: Fermilab, Batavia, Ill. 60510.
^‡Present address: University of Illinois, Urbana, Ill. 61801.
^§Present address: Ohio State University, Columbus, Ohio 43210.
^∥Present address: Institute for Nuclear Studies, University of Tokyo, Tokyo 188, Japan.
^¶Present address: Brookhaven National Laboratory, Upton, N.Y. 11973.