Gauge invariance and the unstable particle | Zendy

Robin G. Stuart | Zendy

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Gauge invariance and the unstable particle

Author(s) -

Robin G. Stuart

Publication year - 1997

Publication title -

aip conference proceedings

Language(s) - English

Resource type - Conference proceedings

eISSN - 1551-7616

pISSN - 0094-243X

DOI - 10.1063/1.53257

Subject(s) - gauge boson , physics , invariant (physics) , gauge (firearms) , gauge theory , particle (ecology) , mathematical physics , classical mechanics , oceanography , archaeology , history , geology

It is shown how to construct exactly gauge-invariant S-matrix elements forprocesses involving unstable gauge particles such as the $Z^0$ boson. Theresults are applied to derive a physically meaningful expression for thecross-section $\sigma(e^+e^-\to Z^0Z^0)$ and thereby provide a solution to thelong-standing problem of the unstable particle.Comment: 8 pages LaTeX. Uses aipproc.sty and epsfig.sty. Talk presented at 1st Latin American Symposium on High-energy Physics, SILAFAE-I, Merida, November 1--5, 199

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