Gluon Polarimetry with Energy-Energy Correlators

Area of Science:

• High Energy Physics
• Quantum Chromodynamics
• Particle Physics

Background:

• Understanding the spin structure of the proton is crucial in particle physics.
• Gluon polarization is a key component of the proton's spin, but it is challenging to measure.
• Existing methods for probing gluon polarization often rely on complex calculations or advanced jet substructure analysis.

Purpose of the Study:

• To introduce a novel and theoretically robust method for probing gluon linear polarization.
• To provide an experimentally accessible observable for gluon polarimetry.
• To enable precise measurements of gluon polarization at current and future collider experiments.

Main Methods:

• Utilizing single- and two-point energy correlations within jets.
• Exploiting the cos2ϕ azimuthal modulation characteristic of polarized gluon-initiated jets.
• Performing an all-order analysis within the Ciafaloni-Catani-Fiorani-Marchesini (CCFM) formalism.
• Incorporating coherent branching effects for enhanced precision.

Main Results:

• The proposed method provides a clear signature of gluon polarization through azimuthal modulations.
• The CCFM formalism with coherent branching offers a precise theoretical framework for predictions.
• The method is shown to be theoretically robust and experimentally accessible.

Conclusions:

• The developed energy correlation technique offers a promising new avenue for gluon polarimetry.
• This method can be implemented at various particle colliders like the LHC, RHIC, HERA, and EIC.
• The findings pave the way for more precise investigations into the proton's spin structure.