tau-mu Flavor Violation as a Probe of the Scale of New Physics

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Motivated by recent experimental indications of large {nu}{sub {mu}} - {nu}{tau} mixing, we explore current bounds on the analogous mixing in the charged lepton sector. We present a general formalism for dimension-6 fermionic effective operators involving {tau}-{mu} mixing with typical Lorentz structures and discuss their relationship to the standard model gauge symmetry. We find the low-energy constraints on the new physics scale associated with each operator, mostly from current experimental bounds on rare decay processes of {tau}, hadrons or heavy quarks. For operators involving at least one light quark (u, d, s), these constraints typically give a bound on the ... continued below

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879 Kilobytes pages

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Black, Deirdre; Han, Tao; He, Hong-Jian & Sher, Marc April 1, 2002.

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Motivated by recent experimental indications of large {nu}{sub {mu}} - {nu}{tau} mixing, we explore current bounds on the analogous mixing in the charged lepton sector. We present a general formalism for dimension-6 fermionic effective operators involving {tau}-{mu} mixing with typical Lorentz structures and discuss their relationship to the standard model gauge symmetry. We find the low-energy constraints on the new physics scale associated with each operator, mostly from current experimental bounds on rare decay processes of {tau}, hadrons or heavy quarks. For operators involving at least one light quark (u, d, s), these constraints typically give a bound on the new physics scale of a few TeV or higher. Those operators with two heavy quarks turn out to be more weakly constrained at present, giving bounds of a few hundred GeV. A few scalar and pseudo-scalar operators are not subject to any current experimental constraints.

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879 Kilobytes pages

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  • Report No.: JLAB-THY-02-20
  • Report No.: DOE/ER/40150-2066
  • Grant Number: AC05-84ER40150
  • Office of Scientific & Technical Information Report Number: 793835
  • Archival Resource Key: ark:/67531/metadc734752

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  • April 1, 2002

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  • Oct. 19, 2015, 7:39 p.m.

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  • Feb. 5, 2016, 8:38 p.m.

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Black, Deirdre; Han, Tao; He, Hong-Jian & Sher, Marc. tau-mu Flavor Violation as a Probe of the Scale of New Physics, article, April 1, 2002; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc734752/: accessed November 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.