g g , g A collisions: experimental signatures

• Central rapidities:

• (1) Low multiplicities: N<~15

• (2) Low total transverse momentum (“coherence condition”):

• pT < √2 ℏ/RA or pT~minv /g ~ 30 – 50 MeV

• (3) Zero net charge: even # of charged tracks of opposite signs.

• (4) Narrow dN/dy peaked at y=0 (narrower for larger minv ).

• Forward rapidities:

• (5) Large probability of multiple e.m. interactions

• (3g exch.): Mutual Coulomb excitation (GDR)

• leading to A* dissociation via (forward) neutron

• (Xn) emission: P~30-50% (J/).