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<p>The dilepton production at forward rapidities in hadronic collisions at the LHC energies is considered and the helicity density matrix elements of gauge bosons that enter the Drell-Yan angular coefficients associated with the gauge boson decay (<i>G</i> = <i>γ</i><sup>∗</sup>, <i>Z</i><sup>0</sup>, <i>W</i>) are derived using the color-dipole <i>S</i>-matrix framework. We show results for <i>pp</i> collisions at <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="13130_2025_27303_Article_IEq1.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="30" /> </InlineMediaObject> <EquationSource Format="MATHML"><math display="inline"> <msqrt> <mi>s</mi> </msqrt> </math></EquationSource> <EquationSource Format="TEX">\( \sqrt{s} \)</EquationSource> </InlineEquation> = 14 TeV for the nonvanishing helicity density matrix elements in the rapidity range of 2.0 ≤ <i>y</i> ≤ 4.0 of the gauge boson. We consider different models for the proton unintegrated gluon distributions, among others a solution of the Balitsky-Kovchegov equation. We compare the associated predictions with those obtained disregarding the non-linear term in the evolution equation. In addition, the Lam-Tung relation is discussed.</p>

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Dilepton angular distributions in the color-dipole S-matrix framework

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  • 出版模式：

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  • 发表日期：

    2025年10月1日

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  • Yan B. Bandeira,
  • Victor P. Gonçalves,
  • Wolfgang Schäfer

摘要

The dilepton production at forward rapidities in hadronic collisions at the LHC energies is considered and the helicity density matrix elements of gauge bosons that enter the Drell-Yan angular coefficients associated with the gauge boson decay (G = γ∗, Z0, W) are derived using the color-dipole S-matrix framework. We show results for pp collisions at s \( \sqrt{s} \) = 14 TeV for the nonvanishing helicity density matrix elements in the rapidity range of 2.0 ≤ y ≤ 4.0 of the gauge boson. We consider different models for the proton unintegrated gluon distributions, among others a solution of the Balitsky-Kovchegov equation. We compare the associated predictions with those obtained disregarding the non-linear term in the evolution equation. In addition, the Lam-Tung relation is discussed.