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Related Experiment Video

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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

Published on: June 28, 2018

Spin structure of the pion.

D Brömmel¹, M Diehl, M Göckeler

¹Deutsches Elektronen-Synchrotron DESY, 22603 Hamburg, Germany.

Physical Review Letters

|October 15, 2008

Summary

We calculated the pion's transverse spin structure using lattice quantum chromodynamics (QCD). Results show a quark distribution asymmetry, similar to nucleons, supporting the universality of Boer-Mulders functions.

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Area of Science:

* Quantum Chromodynamics (QCD) and Hadron Physics
* Computational Physics and Lattice Gauge Theory

Background:

* Understanding the transverse spin structure of hadrons is crucial for a complete picture of nucleon structure.
* Previous calculations explored quark transverse spin asymmetries in the nucleon.

Purpose of the Study:

* To perform the first lattice QCD calculation of the pion's transverse spin structure.
* To investigate the spatial distribution of transversely polarized quarks within the pion.
* To compare the pion's spin structure with that of the nucleon.

Main Methods:

* Utilized lattice QCD simulations with two flavors of nonperturbatively improved Wilson fermions.
* Employed pion masses as low as 400 MeV and volumes up to (2.1 fm)^3.
* Used lattice spacings below 0.1 fm for high precision.

Main Results:

* Observed a characteristic asymmetry in the spatial distribution of transversely polarized quarks in the pion.
* The magnitude of this asymmetry is comparable to that found for quarks in the nucleon.
* Demonstrated a similarity between the pion and nucleon transverse spin structures.

Conclusions:

* The findings provide the first direct evidence for a specific transverse spin structure in the pion.
* Results support the hypothesis that Boer-Mulders functions are universal across different hadrons.
* This study advances the understanding of spin phenomena in quantum chromodynamics.