down quark

How To Use down quark In A Sentence

• A neutral pion consists of a down quark and a down antiquark.
• A free neutron, for example, will decay with a half-life of about 18 minutes into a proton, electron and antielectron-neutrino, due to a down quark decaying into an up quark via the emission of a virtual W- particle. Your Favorite Conservatives on Evolution and ID - The Panda's Thumb
• The wave functions of both the deuteron and the alpha particle are invariant under the interchange of up and down quarks but recall that the pion wave function is not.
• Now nuclear physicists in Japan, Russia and the US have discovered a particle that contains two up quarks, two down quarks and a strange antiquark.
• A neutral pion consists of a down quark and a down antiquark.
• At this energy level, only up and down quarks, the electron and the electron neutrino exist.
• The new results promise to yield important information about the up and down quarks that comprise protons and neutrons.
• Quarks come in oddly named ‘flavors,’ and all the new species include two strange, one anti-up, and either an up or a down quark among the five (the pentaquarks discovered last spring all had two ups, two downs, and one anti-strange).
• Everyday matter is composed of just three types of particles: up quarks, down quarks and electrons.
• The antineutron, although neutral like the neutron, is distinguishable from the neutron because it is composed of two anti-down quarks and one anti-up quark.