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Mixed Strong-Electroweak Corrections to the Drell-Yan Process.

Roberto Bonciani1, Luca Buonocore2, Massimiliano Grazzini2

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Physical Review Letters
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We present the first complete calculation of mixed Quantum Chromodynamics-electroweak (QCD-EW) corrections for the neutral-current Drell-Yan process. This precise calculation is valid across all dilepton invariant masses, offering improved accuracy for particle physics research.

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Area of Science:

  • High-energy particle physics
  • Quantum field theory
  • Standard Model physics

Background:

  • The Drell-Yan process is crucial for probing electroweak interactions.
  • Previous calculations of mixed QCD-EW corrections relied on approximations.
  • Accurate theoretical predictions are essential for interpreting experimental data.

Purpose of the Study:

  • To compute the complete mixed QCD-EW corrections to the neutral-current Drell-Yan process.
  • To provide a calculation valid over the entire range of dilepton invariant masses.
  • To improve the precision of theoretical predictions for this fundamental process.

Main Methods:

  • Utilized semianalytical techniques for two-loop virtual contributions.
  • Employed a q_{T} subtraction formalism to handle singularities with massive final-state particles.
  • Computed master integrals overcoming previous technical challenges.

Main Results:

  • Presented the first complete calculation of mixed QCD-EW corrections for the neutral-current Drell-Yan process.
  • Numerical results show corrections up to -1.5% for dilepton invariant masses up to 1 TeV.
  • At high lepton transverse momentum (p_{T} = 500 GeV), corrections reach -15% relative to NLO QCD.

Conclusions:

  • The complete mixed QCD-EW corrections offer a significant improvement over previous approximations.
  • These results are valid across the full range of dilepton invariant masses.
  • The findings provide a more precise theoretical benchmark for experimental analyses.