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Polarized charged-current Drell-Yan process in ReneSANCe generator

S. Bondarenko, Ya. Dydyshka, L. Kalinovskaya, A. Kampf, R. Sadykov, V. Yermolchyk

TL;DR

The paper validates the polarized charged-current Drell–Yan implementation in the ReneSANCe Monte Carlo generator by comparing key observables to SPHINX and Zykunov results. It presents a complete one-loop electroweak correction framework for longitudinally polarized initial states, built on helicity amplitudes and PDF convolutions, and includes infrared-safe soft/hard emission terms with collinear quark-mass–singularity subtraction. Born-level cross sections show full agreement with SPHINX, while one-loop comparisons are limited with Zykunov due to mass-singularity subtraction; nevertheless, ReneSANCe demonstrates consistency with existing polarized calculations. The study finds that radiative corrections have a negligible impact on single- and double-spin asymmetries within current polarized PDF uncertainties, supporting ReneSANCe as a reliable tool for polarized Drell–Yan analyses and global fits at facilities like RHIC. Overall, the work reinforces the consistency of polarized Drell–Yan predictions across independent codes and establishes a robust framework for precision studies of polarized parton distributions.

Abstract

This work is devoted to validating the results obtained using the Monte Carlo generator ReneSANCe. A comparison of differential cross sections, as well as single- and double-spin asymmetries, taking into account the polarization of initial states is presented.

Polarized charged-current Drell-Yan process in ReneSANCe generator

TL;DR

The paper validates the polarized charged-current Drell–Yan implementation in the ReneSANCe Monte Carlo generator by comparing key observables to SPHINX and Zykunov results. It presents a complete one-loop electroweak correction framework for longitudinally polarized initial states, built on helicity amplitudes and PDF convolutions, and includes infrared-safe soft/hard emission terms with collinear quark-mass–singularity subtraction. Born-level cross sections show full agreement with SPHINX, while one-loop comparisons are limited with Zykunov due to mass-singularity subtraction; nevertheless, ReneSANCe demonstrates consistency with existing polarized calculations. The study finds that radiative corrections have a negligible impact on single- and double-spin asymmetries within current polarized PDF uncertainties, supporting ReneSANCe as a reliable tool for polarized Drell–Yan analyses and global fits at facilities like RHIC. Overall, the work reinforces the consistency of polarized Drell–Yan predictions across independent codes and establishes a robust framework for precision studies of polarized parton distributions.

Abstract

This work is devoted to validating the results obtained using the Monte Carlo generator ReneSANCe. A comparison of differential cross sections, as well as single- and double-spin asymmetries, taking into account the polarization of initial states is presented.

Paper Structure

This paper contains 8 sections, 7 equations, 3 figures.

Table of Contents

  1. Spin-dependent observables
  2. Hadronic level
  3. Partonic level
  4. Polarized cross sections and asymmetries
  5. Numerical results
  6. Comparison of differential cross sections
  7. Comparison of single- and double-asymmetries
  8. Conclusions

Figures (3)

  • Figure 1: Results of the comparison differential cross sections as a function of rapidity for both W$^{+}$ and W$^{-}$ channels between ReneSANCe and SPHINX.
  • Figure 2: Results for single-spin asymmetries as a function of transverse momentum for different values of pseudo-rapidity $\eta$.
  • Figure 3: Results for double-spin asymmetries as a function of transverse momentum for different values of pseudo-rapidity $\eta$.