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Probing the Quark Orbital Angular Momentum at Electron-Ion Colliders Using Exclusive π^{0} Production
Shohini Bhattacharya1, Duxin Zheng2, Jian Zhou3
1<a href="https://ror.org/05db1vq90">RIKEN BNL Research Center</a>, Brookhaven National Laboratory, Upton, New York 11973, USA.
Physical Review Letters
|August 19, 2024
Summary
We propose detecting quark orbital angular momentum (OAM) signals via exclusive pi0 production in electron-proton collisions. The sin2ϕ correlation in scattered electron-proton momentum is a key indicator for quark OAM studies.
Area of Science:
- Nuclear Physics
- Particle Physics
- Quantum Chromodynamics
Background:
- Understanding the spin structure of the proton is a fundamental goal in nuclear physics.
- Quark orbital angular momentum (OAM) is a crucial, yet experimentally elusive, component of proton spin.
- Existing theoretical frameworks, like the Jaffe-Manohar spin sum rule, require experimental validation of quark OAM contributions.
Purpose of the Study:
- To propose a novel method for experimentally detecting quark orbital angular momentum (OAM).
- To investigate the potential of exclusive pi0 production in electron-proton collisions as a probe for quark OAM.
- To establish a connection between quark OAM and the Jaffe-Manohar spin sum rule through experimental observables.
Main Methods:
- Utilizing longitudinally polarized electron-proton collisions.
- Analyzing the sin2ϕ azimuthal angular correlation between the scattered electron's transverse momentum and the recoil proton's momentum.
- Performing numerical estimates of the asymmetry for Electron-Ion Collider (EIC) kinematics.
Main Results:
- The sin2ϕ azimuthal angular correlation is identified as a sensitive observable for probing quark OAM.
- A quantitative estimate of the asymmetry for this correlation is provided for EIC-accessible kinematics.
- The proposed method offers a direct pathway to experimentally access quark OAM.
Conclusions:
- Exclusive pi0 production in electron-proton collisions provides a viable channel to detect quark OAM.
- The sin2ϕ correlation serves as a crucial experimental signature for quark OAM.
- This research lays the groundwork for the first experimental investigation of quark OAM and its role in the Jaffe-Manohar spin sum rule.
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