A new Pomeron-Odderon interference term in the hybrid CGC framework yields a percent-level transverse single spin asymmetry in forward pA collisions, with a characteristic sign-changing node at the saturation scale.
Initial state angular asymmetries in high energy p+A collisions: spontaneous breaking of rotational symmetry by a color electric field and C-odd fluctuations
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abstract
We present a simple model for generating initial-state azimuthal asymmetries in pA collisions from dipole scattering on an anisotropic dense target. Parity even angular harmonics arise from the C-even real part of the dipole S-matrix which spontaneously breaks rotational symmetry in two dimensions due to a condensate for the color electric field. This leads to an angular correlation with the direction of $\vec E$. Parity odd harmonics are generated by the C-odd imaginary part (odderon) due to coupling to coherent target fluctuations which again break rotational invariance. We perform a first qualitative extraction of the amplitude and cutoff of C-odd fluctuations in the dense target.
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Single spin asymmetry in forward $pA$ collisions from Pomeron-Odderon interference
A new Pomeron-Odderon interference term in the hybrid CGC framework yields a percent-level transverse single spin asymmetry in forward pA collisions, with a characteristic sign-changing node at the saturation scale.