CP-violating Gauge-Boson couplings in the process e+e-→μ+μ-νν̄ at a next linear collider

A. Likhoded, S. A. Likhoded, G. Valencia, O. P. Yushchenko

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We study the sensitivity of a 500-GeV e+e- linear collider to CP-violating anomalous gauge-boson couplings. We find that, with an integrated luminosity of 50 fb-1, and with only one nonzero coupling at a time, the process e+e- → W+W- can be used to set the 95%-confidence-level bounds |k̃γ | ≤ 01, |k̃Z \ ≤ 0.1, and |gZ 4 | ≤ 0.1 from CP-even observables. By studying certain distributions in the process e+e- → μ+μ-νν̄ , one of the bounds can be improved to |gZ 4| ≤ 0.06. This process also allows the construction of a CP-odd observable that can be used to set bounds on CP-violating new physics. At a 95% confidence level, we have obtained |k̃γ | ≤ 0.3, |k̃Z | ≤ 0.2, and a much weaker bound on |gZ 4|.

Original languageEnglish
Pages (from-to)886-894
Number of pages9
JournalPhysics of Atomic Nuclei
Issue number5
Publication statusPublished - May 1999
Externally publishedYes

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