![]() ![]() 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. This is the lepton number of concern here there's also the tau and muon lepton family numbers but they don't matter. 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. For electrons and electron neutrinos, L e 1 for their antiparticles, L e 1 all other particles have L e 0. In any interaction, each of these quantities must be conserved separately. A proton decaying into a neutral pion and a positron violates the conservation of baryon number. There are three different lepton numbers: the electron-lepton number L e, the muon-lepton number L, and the tau-lepton number L. One serious objection is that the positronium 'nucleus' has non-zero lepton number. 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. An isolated positron is presumably as stable as an electron. Lepton number violation (LNV) is explicitly forbidden even in the minimally extended SM, where the observation of a LNV process would be unambiguous evidence of physics beyond the SM. Leptons are fundamental particles (including the electron, muon and tau, as well as the three types of neutrinos associated with these 3). ![]()
0 Comments
Leave a Reply. |