This fermion pair can be leptons or quarks. Elementary fermions are grouped into three generations, each comprising two leptons and two quarks. They could detect and distinguish between leptons, hadrons and photons. The quarks, leptons, and W boson all have antiparticles with opposite electric charge. The Standard Model recognizes two types of elementary fermions&colon; quarks and leptons. Ordinary matter is composed of two types of elementary particles&colon; quarks and leptons. The Standard Model counts six flavours of quarks and six flavours of leptons. In particle physics, preons are point particles, conceived of as sub-components of quarks, and leptons. Recognizing faces as attractive, like recognizing certain arrangements of leptons, quarks, etc. Effectively, all baryonic matter will have been changed into photons and leptons. Electrons have the least mass of all the charged leptons. Sleptons are the scalar partners of the leptons of the Standard Model. No analogous mechanism exists in the Standard Model that would make charged leptons detectably oscillate. The best known of all leptons is the electron. Initially leptons and antileptons are produced in pairs.