First derivation of Z and W helicity density matrix elements in the color-dipole S-matrix framework, with forward-rapidity predictions at 14 TeV linking the Lam-Tung violation to the UGD tail.
Production of electroweak gauge bosons at forward rapidities in the color - dipole $S$ - matrix framework
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abstract
The cross-section for the production of an electroweak gauge boson ($G = W^{\pm}, Z^0, \gamma$) at forward rapidities in $pp$ collisions is derived within the color - dipole $S$ - matrix framework. We present the full expressions for the differential cross-section of the $q p \rightarrow G X$ process in the impact parameter and transverse momentum spaces, considering the longitudinal and transverse polarizations of the gauge boson. The particular cases associated with the Drell - Yan process and real photon production are discussed. We demonstrate that the final formulae are expressed in terms of the dipole - proton cross-section or the unintegrated gluon distribution, and can be used to estimate the impact of the saturation effects in the gauge boson production at the LHC and future colliders.
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Dilepton angular distributions in the color-dipole $S$-matrix framework
First derivation of Z and W helicity density matrix elements in the color-dipole S-matrix framework, with forward-rapidity predictions at 14 TeV linking the Lam-Tung violation to the UGD tail.