Revealing dressed quarks via the proton's charge distribution

Area of Science:

• Particle Physics
• Quantum Chromodynamics

Background:

• The proton is a fundamental composite particle, central to atomic nuclei.
• Its structure is defined by valence quarks (two up, one down) and their interactions.
• Recent research suggests a potential zero in the proton's charge distribution.

Purpose of the Study:

• To investigate the implications of a potential zero in the proton's electric form factor.
• To explore how this zero relates to nonperturbative features of quark interactions.
• To understand its sensitivity to the running of the dressed-quark mass.

Main Methods:

• Theoretical analysis of proton structure and form factors.
• Exploration of quark-quark interactions within the Standard Model.
• Connecting experimental observations to theoretical predictions.

Main Results:

• The existence and position of a zero in the electric form factor can quantify nonperturbative quark interactions.
• This zero is sensitive to the running of the dressed-quark mass.
• Future experiments will clarify these phenomena.

Conclusions:

• The study provides a framework for interpreting experimental results on proton structure.
• Understanding the proton's charge distribution zero offers insights into emergent phenomena in strong interactions.
• This research highlights the interplay between theory and experiment in probing fundamental particle physics.