Single weak boson production at TeV e+ e- colliders - INSPIRE

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Single weak boson production at TeV e+ e- colliders

Kaoru Hagiwara
(
- Durham U. and
- KEK, Tsukuba
)
,
H. Iwasaki
(
- Hiroshima U.
)
,
A. Miyamoto
(
- KEK, Tsukuba
)
,
H. Murayama
(
- Tokyo U.
)
,
D. Zeppenfeld
(
- Wisconsin U., Madison
)

Dec, 1990

53 pages

Published in:

Nucl.Phys.B 365 (1991) 544-596

Published: 1991

DOI:

10.1016/0550-3213(91)90442-Z

Report number:

KEK-TH-255,
KEK-PREPRINT-90-40,
DTP-90-82,
HUPD-9015,
UT-574-TOKYO,
MAD-PH-417

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Abstract: (Elsevier)

We present exact tree level matrix elements for all the single weak boson production processes to order e 3 in very high energy e + e − collisions; e + e − → e ± v (−) c W ∓ , e + e − Z , v c v c Z and γγZ. The electron mass is kept finite so that the differential and total cross sections are accurate up to terms of order m e 2 / s . The weak boson distributions are compared with those obtained by the equivalent photon/electron approximation (EPA), which works reasonably well at high vector boson transverse momenta but fails at small transverse momenta for the processes e + e − → e + e − Z and γγZ. A simple modification of the EPA formulae is found to give a reasonable overall description of the distributions for all the single weak boson production processes. Electron helicity-flip amplitudes are found to contribute at the percent level at most, which can be reproduced accurately by a novel collinear approximation with equivalent real photon or electron distributions in an electron. Interference effects between the annihilation and non-annihilation diagrams are found to be significant only below the weak boson pair production threshold. Also explained is a straightforward method to incorporate the leptonic and parton level hadronic decays of the weak bosons into the production amplitudes.

electron positron: annihilation
annihilation: electron positron
electron positron: inelastic scattering
inelastic scattering: electron positron
intermediate boson: electroproduction
electroproduction: intermediate boson
differential cross section
channel cross section: energy dependence
tree approximation
equivalent photon approximation

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