up quark

American  

noun

Physics.

1. the quark having electric charge 2/3 times the elementary charge and strangeness and charm equal to 0.

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up quark Scientific  

/ ŭp /

1. A quark with a charge of +2/3. Its mass is approximately 10 times the electron mass and is the least mass of all quarks.

2. See Table at subatomic particle

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Etymology

Origin of up quark

First recorded in 1975–80

Example Sentences

Lambda particles are baryons, which means they’re a type of hadron made of three quarks: one up quark, one down quark and one strange quark.

From Scientific American

For instance, the electron has heavier versions called muons and taus, the up quark has heavier relatives named charm and top quarks, and the down quark is followed by strange and beauty quarks.

From Scientific American

Physicists are also reassessing particle flavor, a quantum property that defines the species of fermion: up quark, down quark, electron, muon, and so on.

From Scientific American

A beam of positive pions—lightweight particles made from an up quark and a down antiquark—decay into muons and muon neutrinos.

From Scientific American

The first family comprises three charged particles — the up quark, the down quark and the electron — and a neutral particle called the electron neutrino.

From Nature