Search for <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>Δ</mi><mi>I</mi><mo>=</mo><mn>2</mn><mn></mn></math></span> Electromagnetic Currents in Pion Photoproduction

R. W. Clifft; E. Gabathuler; L. S. Littenberg; R. Marshall; S. E. Rock; J. C. Thompson; D. L. Ward; G. R. Brookes

doi:10.1103/PhysRevLett.33.1500

Search for $Δ I = 2$ Electromagnetic Currents in Pion Photoproduction

R. W. Clifft, E. Gabathuler, L. S. Littenberg, R. Marshall, S. E. Rock, J. C. Thompson, D. L. Ward, and G. R. Brookes

Phys. Rev. Lett. 33, 1500 – Published 16 December 1974

Abstract

Differential cross sections for the reactions $γ p \to π^{0} p, π^{+} n$ and $γ n \to π^{-} p, π^{0} n$ were measured in a single experiment using tagged photons in the energy region 240-450 MeV incident on ${}^{1}H_{2}$ and ${}^{2}H_{2}$ targets. Results of the measurements of the ratios $\frac{π^{0} n}{π^{0} p}$ and $\frac{π^{-} p}{π^{+} n}$ are presented. The ratio of isotensor to isovector amplitude is found to be 0.00±0.02.

Received 14 October 1974

DOI:https://doi.org/10.1103/PhysRevLett.33.1500

Authors & Affiliations

R. W. Clifft, E. Gabathuler, L. S. Littenberg^*, R. Marshall, S. E. Rock, J. C. Thompson, and D. L. Ward^†

Daresbury Laboratory, Daresbury, near Warrington, Lancastershire, England

G. R. Brookes

University of Sheffield, Sheffield, England

^*Present address: Physics Department, Brookhaven National Laboratory, Upton, N. Y. 11973.
^†Present address: Physics Department, Heriot Watt University, Edinburgh, Scotland.