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Setting Limits on Supersymmetry Using Simplified Models
07:46

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Published on: November 15, 2013

Testing the time-reversal modified universality of the Sivers function.

Zhong-Bo Kang1, Jian-Wei Qiu

  • 1Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA. kangzb@iastate.edu

Physical Review Letters
|November 13, 2009
PubMed
Summary
This summary is machine-generated.

We derived time-reversal modified universality for quark and gluon Sivers functions. Measurable lepton asymmetry from W boson decay at RHIC can test this universality.

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Area of Science:

  • Quantum Chromodynamics (QCD)
  • Particle Physics
  • High-Energy Nuclear Physics

Background:

  • The Sivers function describes the transverse spin distribution of quarks and gluons within protons.
  • Understanding the universality of the Sivers function is crucial for probing the spin structure of hadrons.

Purpose of the Study:

  • To derive and test the time-reversal modified universality of the Sivers function.
  • To investigate the feasibility of measuring this universality using W boson decays at the Relativistic Heavy Ion Collider (RHIC).

Main Methods:

  • Derivation of time-reversal modified universality from QCD principles (parity and time-reversal invariance).
  • Calculation of single transverse-spin asymmetry for inclusive leptons from W boson decay in polarized proton-proton collisions at RHIC.
  • Analysis of lepton rapidity distribution to assess measurability.

Main Results:

  • The time-reversal modified universality for both quark and gluon Sivers functions was successfully derived.
  • A measurable lepton asymmetry, on the order of several percent, was predicted from W boson decays.
  • The asymmetry is observable over a significant range of lepton rapidity at RHIC.

Conclusions:

  • The lepton asymmetry from W boson decay at RHIC serves as an excellent observable for testing the time-reversal modified universality of the Sivers function.
  • This measurement provides a novel avenue to probe fundamental aspects of QCD and the spin structure of protons.