![]() Okay! Part (b) asks us to write the analogous decay for the anti-proton and so we take the anti-particle for each of these and the neutral pion is strange because its anti-particle is itself and so I don't need to write a bar on top of the neutral pion and the anti-particle to the positron is the electron. ![]() The first reaction above (decay of the pion ) is known to be a two-body decay by the fact that a well-defined muon energy is observed from the decay. This is the lepton number of concern here there's also the tau and muon lepton family numbers but they don't matter. The observation of the following two decay processes leads to the conclusion that there is a separate lepton number for muons which must also be conserved. The electron family number is also not conserved because the proton has a 0 for the electron family number whereas the electron or positron has negative 1 and the neutral pion has 0 and this should be negative 1 there so electron family number is not conserved. When we consult table, we see the proton has a baryon number of 1 and the neutral pion has a baryon number of 0 and the electron or positron has a baryon number of 0 as well so it's 1 on the left and total of 0 on the right and so baryon number is not conserved. When a positron meets an electron, they annihilate to produce a pair of gamma ray photons, each of energy 511 keV. Take a look at PET scans and how they are made. Other non-leptonic particles have a lepton number of 0. A proton decaying into a neutral pion and a positron violates the conservation of baryon number. Likewise, an anti-electron (also known as the positron) has a charge of +1 and a lepton number of -1. The six leptons each have a lepton number of +1, while the six anti-leptons each have a lepton number of -1. Each lepton has a lepton number of 1 and each antilepton has a lepton number of -1. Then an electron is always accompanied by the creation of an antineutrino, e.g., to conserve the lepton number (initially zero). The lepton number is +1 for these particles and -1 for their antiparticles. This is College Physics Answers with Shaun Dychko. Leptons are fundamental particles (including the electron, muon and tau, as well as the three types of neutrinos associated with these 3).
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