Gluon saturation

The FPD can identify neutral pions produced at large pseudorapidity (3 < eta < 4).  In general, forward jets arise from asymmetric partonic collisions, typically involving a quark from one beam and a gluon from the other.  For d+Au interactions, particle detection with the FPD can test models of gluon saturation.

• Adrian Dumitru and Jamal Jalilian-Marian, "Forward Quark Jets from Protons Shattering the Colored Glass", PRL 89 (2002) 022301.
• J.T. Lenaghan and K. Tuominen, "Saturation and Pion Production in Proton-Nucleus Collisions", hep-ph/0208007.

The FPD can identify neutral pions produced at large Feynman x (x_F > 0.2) and moderate transverse momentum (p_T < 4 GeV/c).  For collisions of transversely polarized protons, this kinematic range may have large analyzing powers.  There are many references to this.

• Vincenzo Barone, Alessandro Drago and Philip G. Ratcliffe, "Transverse Polarisation of Quarks in Hadrons", Phys.Rept. 359 (2002) 1-168.

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