Meson Production in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mo>+</mml:mo><mml:mi>d</mml:mi></mml:math>Collisions and the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>I</mml:mi><mml:mo>=</mml:mo><mml:mn>0</mml:mn><mml:mn/></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>π</mml:mi><mml:mo>−</mml:mo><mml:mi>π</mml:mi></mml:math>Interaction. I. Measured Momentum Spectra of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">He</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">H</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>Nuclei from High-Energy<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mo>+</mml:mo><mml:mi>d</mml:mi></mml:math>Collisions

196394 citationsJournal Articlegreen Open Access

Authors

A. Abashian · Lawrence Berkeley National Laboratory

N. E. Booth · University of California, Berkeley

K. M. Crowe · Lawrence Berkeley National Laboratory

R. E. Hill · Lawrence Berkeley National Laboratory

Ernest H. Rogers · Lawrence Berkeley National Laboratory

Abstract

The momentum spectra of ${\mathrm{He}}^{3}$ and ${\mathrm{H}}^{3}$ nuclei produced in $p+d$ collisions have been measured with high resolution. Data were obtained at several angles and incident proton energies of about 745 MeV. Each spectrum exhibits a peak due to single pion production and a continuum due to double pion production. An anomalous bump has been observed in the ${\mathrm{He}}^{3}$ spectra which we interpret as an $I=0$ virtual di-pion with a scattering length of 2 \ensuremath{\Elzxh}/\ensuremath{\mu}c. In this series of four papers we summarize the data obtained over a series of three cyclotron runs. The first paper deals with the experiment and techniques, and the second with the results of the measurements on single-pion production. Next we describe an experiment to determine the spin and parity of the anomalous bump, and finally we discuss its interpretation.

Topics & Keywords

Quantum Chromodynamics and Particle Interactions Particle physics theoretical and experimental studies High-Energy Particle Collisions Research

Publication Details

Published in: Physical Review

Volume 132, Issue 5, pp. 2296-2304

DOI: 10.1103/physrev.132.2296

Field-Weighted Citation Impact: 29.02

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