Measuring W photon couplings in a 500 GeV e sup + e sup - collider
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.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 5179194
- Report Number(s):
- SLAC-383; ON: DE92000888
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ELECTRON-POSITRON INTERACTIONS
COUPLING
PHOTON-ELECTRON INTERACTIONS
PHOTON-PHOTON INTERACTIONS
W MINUS BOSONS
W PLUS BOSONS
BREMSSTRAHLUNG
CROSS SECTIONS
STANDARD MODEL
BASIC INTERACTIONS
BOSONS
ELECTROMAGNETIC INTERACTIONS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
INTERACTIONS
INTERMEDIATE BOSONS
INTERMEDIATE VECTOR BOSONS
LEPTON-LEPTON INTERACTIONS
MATHEMATICAL MODELS
PARTICLE INTERACTIONS
PARTICLE MODELS
PHOTON-LEPTON INTERACTIONS
RADIATIONS
UNIFIED GAUGE MODELS
645102* - High Energy Physics- Particle Interactions & Properties-Experimental- Weak Interactions & Properties
645203 - High Energy Physics- Particle Interactions & Properties-Theoretical- Weak Interactions & Properties