Test Of Charge Independence Research Articles

Test of charge independence in p + d → (A=3)+pion reactions

Test of charge independence in p + d → (A=3)+pion reactions

Additional Data in the Reactionπ+p→Σ+K+at 1.28 and1.41 GeVcand a Test of Charge Independence in the c.m. Energy Range 1.820 to 2.090 GeV

Data at two additional ${\ensuremath{\pi}}^{+}$ momenta (1.28 and $1.41 \frac{\mathrm{GeV}}{c}$) in the reaction ${\ensuremath{\pi}}^{+}p\ensuremath{\rightarrow}{\ensuremath{\Sigma}}^{+}{K}^{+}$ are presented. Charge independence is tested over the c.m. energy range 1.820 to 2.090 GeV; we used our data for the ${\ensuremath{\Sigma}}^{+}{K}^{+}$ channel and published data for the ${\ensuremath{\pi}}^{\ensuremath{-}}p\ensuremath{\rightarrow}{\ensuremath{\Sigma}}^{0}{K}^{0}$ and ${\ensuremath{\Sigma}}^{\ensuremath{-}}{K}^{+}$ channels.

A test of charge independence in π p backward scattering below 600 MeV

Charge independence in the strong interactions has been tested by examining the backward cross sections for pion-nucleon scattering from 150 to 600 MeV. In contrast to the conclusion suggested by previous data, present data reveal no compelling evidence for a violation. At 425 MeV, an upper limit (90% confidence) of 0.3 is found for the ratio of the magnitude of the isospin violating amplitude to the magnitude of the π + elastic scattering amplitude.

Aspects of Nucleon-Nucleon Scattering Theory

Selected aspects of nucleon-nucleon scattering are critically reviewed. Phase shifts are treated relativistically in a manner similar to the usual non- relativistic one. Relativistic kinematics, nonrelativistic treatments, low- energy p-p scattering, corrections to Coulomb scattering, the form of the N-N scattering matrix, and the effects of nucleon magnetic moments are considered. General views regarding N-N interactions, the one-pion exchange interaction, tests of charge independence, and evidence concerning two-pion exchange are surveyed. Attempts to explain the still somewhat hypothetical spin-orbit potential and repulsive core by means of heavy mesons strongly interacting with nucleons are discussed. (W.D.M.)

Tests of Charge Independence of Nucleon-Nucleon Interactions

Tests of Charge Independence of Nucleon-Nucleon Interactions

Comparison of the Reactionsp+d→H3+π+,p+d→He3+π0as a Test of Charge Independence

Comparison of the Reactions<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:mo>→</mml:mo><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:mo>+</mml:mo><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>,<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:mo>→</mml:mo><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:mo>+</mml:mo><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>as a Test of Charge Independence

Comparison of the Reactionsp+d→H3+π+,p+d→He3+π0as a Test of Charge Independence

The pair of reactions $p+d\ensuremath{\rightarrow}{\mathrm{H}}^{3}+{\ensuremath{\pi}}^{+}$ and $p+d\ensuremath{\rightarrow}{\mathrm{He}}^{3}+{\ensuremath{\pi}}^{0}$ have been investigated experimentally to see if the predictions of the theory of charge independence are fulfilled. Because of the low cross section (a few microbarns) and large background (heavy particles emitted at \ensuremath{\sim}10\ifmmode^\circ\else\textdegree\fi{} lab) the results do not provide as critical a test as might be hoped. We find that there is a 50% chance that the ratio of the reaction cross sections $\frac{(p+d\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}+{\mathrm{H}}^{3})}{(p+d\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}+{\mathrm{He}}^{3})}$ is between 2.0 and 2.6. Charge independence predicts that the ratio should be exactly two. The experimental difficulties would be less at higher proton energies; this method would seem to provide a very stringent test of charge independence if the comparison could be made with sufficient accuracy.

A Test of Charge Independence by the Nuclear Reactions

A Test of Charge Independence by the Nuclear Reactions

Tests of Charge Independence from Pion Production in Nuclear Collisions

Tests of Charge Independence from Pion Production in Nuclear Collisions