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Sivers effect in two-hadron electroproduction.

Aram Kotzinian1, Hrayr H Matevosyan2, Anthony W Thomas2

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The Sivers effect, linked to the Sivers parton distribution function, can be observed in two-hadron production during deep inelastic scattering. New modulations involving hadron pair transverse momenta were identified and quantified.

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Area of Science:

  • High Energy Physics
  • Quantum Chromodynamics
  • Parton Physics

Background:

  • The Sivers effect describes cross-section modulations in semi-inclusive deep inelastic scattering (SIDIS) due to the nucleon's transverse spin.
  • It is fundamentally linked to the Sivers parton distribution function (PDF).

Purpose of the Study:

  • To extend the study of the Sivers effect to two-hadron production in SIDIS.
  • To investigate new azimuthal modulations related to the transverse momenta of hadron pairs.

Main Methods:

  • Utilized a phenomenological parton model to derive the cross-section for two-hadron production.
  • Employed a modified lepto Monte Carlo event generator incorporating the Sivers effect.
  • Estimated single spin asymmetries for the observed modulations.

Main Results:

  • Demonstrated that the Sivers effect manifests as sine modulations in two-hadron production.
  • Identified novel modulations involving the total and relative transverse momenta of the hadron pair (φ(T) and φ(R)).
  • Showed that sin(φ(R)-φ(S)) modulations can be significant, particularly with asymmetric momentum cuts.

Conclusions:

  • The Sivers effect extends to two-hadron production in SIDIS, offering new avenues for probing nucleon structure.
  • The newly observed φ(R) modulations provide a novel signature for the Sivers effect.
  • Future experimental studies with specific kinematic cuts can reveal these significant modulations.