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GUT angle minimises Z0 decay

Alejandro Rivero

hep-pharXiv:hep-ph/0511165

Abstract

The GUT value of Weinberg's angle is also the value that minimises the total square matrix elements of Z0 decay, independently of any GUT consideration, and thus the one that maximises the neutrino branching ratio against total width. We review the proof of this result and some related facts.

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