A-Level Physics OCR A H556

particles and antiparticles; electron–positron, proton-antiproton, neutron-antineutron and neutrino-antineutrino

particle and its corresponding antiparticle have same mass; electron and positron have opposite charge; proton and antiproton have opposite charge

classification of hadrons; proton and neutron as examples of hadrons; all hadrons are subject to both the strong nuclear force and the weak nuclear force

classification of leptons; electron and neutrino as examples of leptons; all leptons are subject to the weak nuclear force but not the strong nuclear force

simple quark model of hadrons in terms of up (u), down (d) and strange (s) quarks and their respective anti-quarks

quark model of the proton (uud) and the neutron (udd)

charges of the up (u), down (d), strange (s), anti-up ($\bar{u}$), anti-down ($\bar{d}$) and the anti-strange ($\bar{s}$) quarks as fractions of the elementary charge e

beta-minus (β^–) decay; beta-plus (β⁺) decay

β^– decay in terms of a quark model; $d ⟶ u + ^0_{-1}e + \bar{ν}$

β⁺ decay in terms of a quark model; $u ⟶ d + ^0_{+1}e + ν$

balancing of quark transformation equations in terms of charge

decay of particles in terms of the quark model.