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Because the lepton number conservation law in fact is violated by chiral anomalies, there are problems applying this symmetry universally over all energy scales. However, the quantum number B − L is commonly conserved in Grand Unified Theory models.
Exact conservation laws include conservation of mass-energy, conservation of linear momentum, conservation of angular momentum, and conservation of electric charge. There are also many approximate conservation laws, which apply to such quantities as mass , parity , [ 1 ] lepton number , baryon number , strangeness , hypercharge , etc.
Generations of matter ... a lepton is an elementary particle of half-integer ... A much stronger conservation law is the conservation of the total number of leptons ...
In some theories, such as the grand unified theory, the individual baryon and lepton number conservation can be violated, if the difference between them (B − L) is conserved (see Chiral anomaly). Strong interactions conserve all flavours, but all flavour quantum numbers are violated (changed, non-conserved) by electroweak interactions .
Conservation of angular momentum. Conservation of total (i.e. net) lepton number, which is the number of leptons (such as the electron) minus the number of antileptons (such as the positron); this can be described as a conservation of (net) matter law.
Conservation of energy and momentum are the principal constraints on the process. [1] All other conserved quantum numbers ( angular momentum , electric charge , lepton number ) of the produced particles must sum to zero – thus the created particles shall have opposite values of each other.
At the ripe old age of 30, Heather Locklear thought she was too old to be on Melrose Place. “I was, like, 30. Or almost 30 or something like that,” Locklear, 63, continued. “And you guys ...
Conservation of baryon number implies that the number of quarks minus the number of antiquarks is a constant. Within experimental limits, no violation of this conservation law has been found. Similarly, each electron and its associated neutrino is assigned an electron number of +1, while the anti-electron and the associated anti-neutrino carry ...