![charm quark charm quark](https://www.universetoday.com/wp-content/uploads/2020/12/quark.jpg)
It is hundreds of times more massive than the up and down quarks that make up protons and neutrons. ( 89 1.26 ( 4 ) ( 12 ) Rolf and Sint ( 90 ) 1.301 ( 34 ) Juge. The charm quark is one of six quarks that, along with leptons, form the basic building blocks of ordinary matter. The particle was named J by the BNL group and ψ by the SLAC group when the naming controversy could not be resolved, the compromise J/ψ was adopted. The charm quark mass from quenched lattice QCD.
![charm quark charm quark](https://render.fineartamerica.com/images/images-profile-flow/400/images/artworkimages/mediumlarge/2/1-quark-masses-laguna-designscience-photo-library.jpg)
It was predicted in 1970 by Sheldon Glashow, John Iliopoulos, and Luciano Maiani, and first observed in November 1974, with the simultaneous discovery of the J/ψ charm particle at SLAC (Stanford Linear Accererator Center) by a group led by Burton Richter and at BNL (Brookhaven National Laboratory) by a group led by Samuel C. Measurements are presented of associated production of a W boson and a charm quark (W+c) in protonproton collisions at a center-of-mass energy of 13TeV. Charm-quark mass effects in NRQCD matching coefficients and the leptonic decay of the (1 S) meson Manuel Egner, Matteo Fael, Jan Piclum, Kay Schönwald, and Matthias Steinhauser Phys. It is the third most massive of the quarks, at 1.3 GeV (a bit more than the mass of the proton). The charm quark is a second-generation quark with a charge of +(2/3) e.