Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-07-31
Eur.Phys.J.A14:247-254,2002
Physics
High Energy Physics
High Energy Physics - Phenomenology
18 pages, 8 eps figures, 1 picture - svjour.cls required; enlarged new version with corrections and additional figure. The Abs
Scientific paper
10.1140/epja/i2001-10195-x
The fragmentation of deuterons into pions emitted forward in the kinematic region forbidden for free nucleon-nucleon collisions is analyzed. The inclusive relativistic invariant spectrum of pions and the tensor analyzing power T_{20} are investigated within the framework of an impulse approximation using different kinds of the deuteron wave function. The influence of P-wave inclusion in the deuteron wave function is studied, too. The invariant spectrum is shown to be more sensitive to the amplitude of the $NN \to \pi X$ process than the tensor analyzing power T_{20}. It is shown that the inclusion of the non-nucleon degrees of freedom in a deuteron results a satisfactory description of experimental data about the inclusive pion spectrum and improves the description of data about T_{20}. According to the experimental data, T_{20} has the positive sign and very small values, less than 0.2, what contradicts to the theoretical calculations ignoring these degrees of freedom.
Illarionov Alexei Yu.
Litvinenko Anatoli G.
Lykasov Gennadi I.
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