Measurements of the differential cross section of the reaction <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>pp</mi><mo>→</mo><mi>d</mi><mrow><msup><mrow><mi>π</mi></mrow><mrow><mo>+</mo></mrow></msup></mrow></math></span> from 3.0 to 5.0 <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mfrac><mrow><mi mathvariant="normal">GeV</mi></mrow><mrow><mi>c</mi></mrow></mfrac></math></span>

H. L. Anderson; D. A. Larson; L. C. Myrianthopoulos; L. Dubal; C. K. Hargrove; E. P. Hincks; R. J. McKee; H. Mes; D. Kessler; A. C. Thompson

doi:10.1103/PhysRevD.9.580

Measurements of the differential cross section of the reaction $pp \to d π^{+}$ from 3.0 to 5.0 $\frac{GeV}{c}$

H. L. Anderson, D. A. Larson, L. C. Myrianthopoulos, L. Dubal, C. K. Hargrove, E. P. Hincks, R. J. McKee, H. Mes, D. Kessler, and A. C. Thompson

Phys. Rev. D 9, 580 – Published 1 February 1974

Abstract

A measurement of the complete differential cross section for the reaction $pp \to d π^{+}$ at 3.00, 3.20, 3.43, 3.65, 3.83, 4.00, 4.20, and 5.05 $\frac{GeV}{c}$ incident proton momentum has been made in an attempt to establish the role of the $Δ$ (1950) in this region. The data show that the previously observed enhancement in the forward cross section between 3 and 4 $\frac{GeV}{c}$ due to this isobar is an effect which damps out quickly as the production angle departs from zero degrees, in contrast with the well-known enhancement at 1.35 $\frac{GeV}{c}$ , which is evident at all angles. In particular, the one-pion-exchange model is in poor agreement with the extended set of data. A detailed description is given of a novel proportional-wire-chamber system which facilitated the selection of this rather rare reaction from a very high competing background.

Received 28 August 1973

DOI:https://doi.org/10.1103/PhysRevD.9.580

Authors & Affiliations

H. L. Anderson, D. A. Larson^*, and L. C. Myrianthopoulos

The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637

L. Dubal^†, C. K. Hargrove, E. P. Hincks^‡, R. J. McKee, and H. Mes^§

The National Research Council of Canada, Ottawa, Canada K1A OR6

D. Kessler and A. C. Thompson^∥

Carleton University, Ottawa, Canada K1S 5B6

^*Present address: Cornell University, Ithaca, New York 14850.
^†Present address: Swiss Institute for Nuclear Research, 5234 Villigen, Switzerland.
^‡Also at Carleton University, Ottawa, Canada.
^§Formerly at Carleton University, Ottawa, Canada.
^∥Present address: Carnegie-Mellon University, Pittsburgh, Pennsylvania 15213.

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Vol. 9, Iss. 3 — 1 February 1974

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Physical Review D

covering particles, fields, gravitation, and cosmology