Kopeliovich, B. Z. (2012) Azimuthal asymmetry of neutrons produced by polarized protons. Il nuovo cimento C, 35 (2). pp. 199-207. ISSN 1826-9885
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Abstract
The transverse single-spin asymmetry AN(t), for inclusive leading neutron production in polarised pp collisions is calculated in the energy range of RHIC. Absorptive corrections to the pion pole generating a relative phase between the spin-flip and non-flip amplitudes, are found to be insufficient to explain the magnitude of AN observed recently in the PHENIX experiment. A larger contribution, comes from the interference of pion and the effective a-Reggeon, which includes the a1 pole and the (dominant) πρ Regge cut. Assuming that this state saturates the spectral function of the axial current we determined its coupling to the nucleons applying the PCAC and the 2d Weinberg sum rule. The results of the parameter-free calculation of AN are in excellent agreement with the PHENIX data.
| Item Type: | Article |
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| Uncontrolled Keywords: | Inclusive production with identified hadrons ; Helicity amplitudes ; Multichannel scattering ; Polarization in particle interactions |
| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 16 Apr 2020 17:05 |
| Last Modified: | 16 Apr 2020 17:05 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/17777 |
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