AUDI R6 Posted July 17, 2019 Share Posted July 17, 2019 (edited) In a particle reaction we take in account the conservation laws of mass-energy , charge , angular momentum , baryon number * and lepton number * I put an asterisk on baryon and lepton number because we are still unsure if those are conserved . If protons or electrons decay this would mean that the law is incorrect. Is the same thing applied for mesons ? I mean mesons and baryons are both hadrons so why there isnt a conservation law for mesons in particle reactions? Edited July 17, 2019 by AUDI R6 Link to comment Share on other sites More sharing options...
Strange Posted July 17, 2019 Share Posted July 17, 2019 8 hours ago, AUDI R6 said: Is the same thing applied for mesons ? There is no separate meson number, but mesons have a baryon number of 0. This is more about quark conservation. But quarks were not known when the baryon number was defined. Link to comment Share on other sites More sharing options...
swansont Posted July 17, 2019 Share Posted July 17, 2019 1 hour ago, Strange said: There is no separate meson number, but mesons have a baryon number of 0. This is more about quark conservation. But quarks were not known when the baryon number was defined. And with that, color charge, I think. With three quarks you can end up with a neutral color, but with two it needs to be color + anti-color. So groups of three quarks would tend to persist, since there's no decay path to a system that isn't three quarks. No so for mesons. But yeah, before we knew about quarks, it was a pattern that certain types of particles seemed to always be around. Link to comment Share on other sites More sharing options...
Mordred Posted July 17, 2019 Share Posted July 17, 2019 (edited) This might not be a full list but just off memory the numerous conservation laws Isospin Spin Charge Flavour Energy/momentum Lepton number Parity Barion number Edited July 17, 2019 by Mordred Link to comment Share on other sites More sharing options...
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