antiquark

Thân thiện

A physicist draws a diagram of an antiquark in a particle collision.

Definition

Noun: - The antiparticle of a quark: An antiquark is an elementary particle that has the same mass as a corresponding quark but opposite electric charge and other quantum properties, such as baryon number and color charge.

Usage

• Antiquarks are fundamental constituents of antimatter hadrons, such as antiprotons and antineutrons.
• In particle interactions, when a quark and an antiquark of the same flavor meet, they can annihilate each other, converting their mass into energy.
• Antiquarks are denoted by a bar over the symbol of the corresponding quark (e.g., an up antiquark is written as ū).

Examples

Advanced Usage

• "Sea antiquarks": In quantum chromodynamics, the proton's structure is not simply three valence quarks; it also contains a "sea" of virtual quark-antiquark pairs, including antiquarks.
• "Antiquark confinement": Like quarks, antiquarks are never found in isolation due to color confinement; they are always bound within composite particles.

Variants and Related Words

• Quark (noun): The corresponding elementary particle that, with antiquarks, makes up hadrons.
• Antiparticle (noun): A subatomic particle having the same mass as a given particle but opposite electric or magnetic properties.
• Hadron (noun): A composite particle made of quarks and/or antiquarks, such as protons, neutrons, and mesons.

Synonyms

• Antimatter counterpart of a quark: This is a descriptive synonym, though "antiquark" is the precise technical term.

Related Phrases and Concepts

• Quark-antiquark pair: Often called a "dipole" in the context of the strong force.
• Annihilation: The process that occurs when a quark and its corresponding antiquark collide and convert into other particles.

Học thuật

Noun

1. the antiparticle of a quark