pi meson

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pion, pi meson

Physics a meson having a positive or negative charge and a rest mass 273.13 times that of the electron, or no charge and a rest mass 264.14 times that of the electron

pi meson [′pī ′mā‚sän]

(particle physics)

Collective name for three semistable mesons which have charges of +1, 0, and -1 times the proton charge, and form a charge multiplet, with an approximate mass of 138 megaelectronvolts, spin 0, negative parity, negativeGparity, and positive charge parity (for the neutral meson). Also known as pion. Symbolized π.

Any meson belonging to an isospin triplet with hypercharge 0, negativeGparity, and positive charge parity (for the neutral meson).

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No references found			These pi mesons interact with the neutrons and protons to heat the nucleus rapidly from the inside, pushing temperatures as high as 20 billion kelvins. Explosive expansion of atomic nuclei by Peterson, Ivars / Science News In the event, an energetic pi meson entered a silicon detector, striking an atomic nucleus and producing a negatively charged beauty particle (B. Aging and decay of beauty by Science News			phytonadione Phytoncide Phytonic Theory Phytooncology phytopathogen Phytopathology Phytophagan phytophagous Phytophthora Phytophthoric Plant Diseases Phytophthra citrophthora phytoplankton phytoremediation Phytosauria Phytoseiidae phytosociology Phytosterol phytotoxin phytotron Phyxios Pi pi attenuator pi bonding pi electron pi filter pi meson pi mode pi network pi point pi section filter Pi Sheng pi symbol pi theorem Pi y Margall, Francisco Pí y Margall, Francisco Pi-beseth pi-calculus Pi-hahiroth pi-mu atom pi-T transformation pia arachnoid pia mater Piacentini, Marcello Piacention Piacenza piache Piad Piaf Piaf, Edith Piaget Piaget, Jean			Pi (definition) Pi (definition) Pi (mathematical constant) Pi (mathematical constant) Pi (mathematical constant) Pi (number) Pi (number) Pi (number) pi attenuator Pi bond pi bonding Pi calculus pi character Pi Continued Fraction Pi Continued Fraction Pi Continued Fraction Pi electron Pi Eta Engagement Resource PI ETA Knowledge Engine Pi Eta Research Technology Pi Eta Risk Management Information Technology Pi Eta Technological Support Pi filter Pi Gamma Mu Pi haherut Pi Kapp Pi Kappa Alpha Pi Kappa Phi Pi Lambda Phi Pi lines pi meson Pi mesons Pi mesons Pi mesons pi mode Pi Mu Epsilon pi network Pi notation Pi notation Pi notation Pi notation Pi Number Pi Number Pi Number Pi Orbital Axis Vector Analysis Pi pa Pi pa Pí pá Pí pá PI PI pi point PI REP PI Scientific Instrument pi section filter Pi Sheng Pi Sigma Epsilon pi symbol pi theorem Pi times Radius Squared Pi to 1,000 places Pi to 1,000 places

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