On the dependence of the single-spin asymmetry of charged pions on kinematical variables |
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Authors: | V V Abramov |
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Institution: | (1) Institute for High Energy Physics, Protvino, Moscow oblast, 142281, Russia |
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Abstract: | The experimental single-spin asymmetry (A N ) of charged pions produced in proton-proton and proton-nucleus collisions is analyzed phenomenologically as a function of kinematical variables. It is shown that the c.m. pion threshold energy (E 0 c.m. ) above which |A N | is positive depends on the reaction energy √s and on the particle-production angle θ c.m.. The dependence of the single-spin asymmetry on the kinematical variables in the region specified by the inequalities 0.7 < p T < 2.7 GeV/c and E c.m. > E 0 c.m. exhibits a scaling behavior. The dependence of A N on √s proves to be significant at moderate and low energies. Formulas that make it possible to predict the behavior of A N for charged pions over a broad region of kinematical variables are derived. |
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