Triple Regge exchange and transverse single-spin asymmetries of the very forward neutral pion production in polarized p+p collisions
Abstract
Recently, the RHICf Collaboration measured the transverse single-spin asymmetries of the very forward neutral pion in polarized p+p collisions at s=510 GeV, produced at large pseudorapidity (η 6). The data show large asymmetries both in longitudinal momentum fraction xF and transverse momentum pT at pT<1\,GeV/c. Employing baryonic triple Regge exchanges, we describe the complete RHICf data for the first time and show that the neutral pion production at low pT can be interpreted as a diffractive one.
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