Yes, quarks exist, and they have been demostrated in particle accelerators in the high energy physics laboratory.
No, the quark is not both fact and fiction. It is fact. The six quarks have all been observed in the results of particle accelerator experiments (collisions) in high energy physics laboratories.
An antibottom quark (or b-bar quark) is the antiparticle of a bottom quark. It has the same mass as a bottom quark but opposite electric charge and other quantum numbers. When a bottom quark meets an antibottom quark, they can annihilate each other and produce energy.
Quark.
Neutral pions are composed of a quark-antiquark pair, specifically an up quark and an anti-up quark or a down quark and an anti-down quark. They are the lightest mesons and are unstable, decaying rapidly into two photons.
An anti-down quark is the antimatter counterpart of a down quark, one of the elementary particles that make up protons and neutrons in the atomic nucleus. It has opposite electric charge to a down quark and can combine with other quarks to form antimatter particles.
quark quark
Quark CopyDesk was created in 1991.
Quark Pharmaceuticals was created in 1993.
An anti-beauty quark, also known as a bottom antiquark, is the antiparticle counterpart of the beauty quark. It is a fundamental particle that has the opposite electric charge and other quantum numbers compared to the beauty quark. When a beauty quark and an anti-beauty quark pair up, they annihilate each other, releasing energy in the form of other particles.
Quark quark.
The final quark, the Top Quark, was discovered in 1995 at FermiLab.
Quark Pharmaceuticals's population is 2,006.