Speaker
Boris Kopeliovich
(UTFSM)
Description
Absorptive corrections, known to suppress proton-neutron transitions with large fractional momentum z→1 in pp collisions, become dramatically strong on a nuclear target, and push the partial cross sections of leading neutron production to the very periphery of the nucleus. The mechanism of π-a1 interference, which successfully explains the observed single-spin asymmetry in polarized pp→nX, is extended to collisions of polarized protons with nuclei. Corrected for nuclear effects, it explains the observed single-spin azimuthal asymmetry of neutrons, produced in inelastic events, where the nucleus violently breaks up. The single-spin asymmetry is found to be negative and nearly A-independent.
| Relevant topics | Forward spin asymmetry |
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