Triple Regge exchange and transverse single-spin asymmetries of the very forward neutral pion production in polarized p plus p collisions

Recently, the RHICf Collaboration measured the transverse single-spin asymmetries of the very ffiffiforward neutral pion in polarized p + p collisions at p s = 510 GeV, produced at large pseudorapidity (eta > 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.

Automated summary

This article investigates the transverse single-spin asymmetries of the very ffiffiforward neutral pion in polarized p + p collisions. It reveals the presence of large asymmetries at low transverse momentum and provides a successful explanation with baryonic triple Regge exchanges.