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- W89238987 abstract "The Standard Model gives definite predictions for the W-photon couplings. Measuring them would test an important ingredient of the model. In this work we study the capability of a 500 GeV e{sup +}e{sup {minus}} collider to measure these couplings. We study the most general C and P conserving WW{lambda} vertex. This vertex contains two free parameters, {kappa} and {lambda}. We look at three processes: e{sup +}e{sup {minus}} {yields} W{sup +}W{sup {minus}}, e{lambda} {yields} W{nu} and {lambda}{lambda} {yields} W{sup +}W{sup {minus}}. For each process we present analytical expressions of helicity amplitudes for arbitrary values of {kappa} and {lambda}. We consider three different sources for the initial photon(s). The first two are breamsstrahlung and beamstrahlung (photon radiation induced by the collective fields of the opposite bunch). Both occur naturally in the collider environment. The third is a photon beam generated by scattering low energy laser light off a high energy electron beam. We examine potential observables for each process, calculating their sensitivity to {kappa} and {lambda}, and estimating the accuracy with which they can be measured. Assuming Standard Model values are actually measured, we present the region in the {kappa}-{lambda} plane to which the W couplings can be restricted with a given confidence level. We find that combining the three processes, one can measure {kappa} and {lambda} with accuracy of 0.01--0.02." @default.
- W89238987 created "2016-06-24" @default.
- W89238987 creator A5034355718 @default.
- W89238987 date "1991-08-01" @default.
- W89238987 modified "2023-10-18" @default.
- W89238987 title "Measuring W photon couplings in a 500 GeV e sup + e sup - collider" @default.
- W89238987 doi "https://doi.org/10.2172/5179194" @default.
- W89238987 hasPublicationYear "1991" @default.
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