1) One of the quarks and one of the antiquarks meet and, in a process called annihilation, produce a W particle.

2) They also allow the reverse processes, antiquarks turning into electrons, and electrons and antielectrons turning into antiquarks and quarks.

3) The Cambridge professor's brain dances around such sub-atomic particles as leptons and anti-quarks and the possibility of infinitely curved space-time.

4) Thus, antiquark, antiproton, etc.

5) It's quark and antiquark.

6) Using the heavy quark antiquark potential which emerges from an effective dilaton gluon coupling inspired by the superstring theory,(http://sentencedict.com/antiquark.html) we study the energy levels of heavy quark antiquark systems.

7) There are no antiprotons or antineutrons, made up from antiquarks, except for a few that physicists produce in large particle accelerators.

8) So the energetic quark quickly rips more quarks and antiquarks out of the vacuum of empty space, and they instantaneously form particles called mesons, each containing a quark and an antiquark.

9) In this paper, by taking the confining potential with the color screening effect as a color confinement between quark and antiquark, the effect on heavy quarkonia (cc and bb) is studied.

10) Any of a family of subatomic particles that participate in strong interactions, are composed of a quark and an antiquark, and have masses generally intermediate between leptons and baryons.

11) Quarks that make the quantum number of hadrons are named 'valence quarks'. Two families of hadrons are baryons (made of three valence quarks) and mesons (which are made from a quark and an antiquark).

12) Meson: Any member of a family of subatomic particles composed of a quark and an antiquark (see antimatter).

13) Any member of a family of subatomic particles composed of a quark and an antiquark antimatter.

14) A quark cannot exist on its own, but must be bound to other quarks or an antiquark.