Determination of quark electroweak Couplings from direct photon production in hadronic Zdecays

We report on a comparison of isolated hard photon production in hadronic Z decays with the predictions of a next-to-leading order matrix-element calculation. We constrain the quark electroweak couplings to the Z boson with a simultaneous fit to three direct photon distributions, and combine this result with an independent constraint from our measurement of the total hadronic width of the Z, obtaining c(u) = 0.92 +/- 0.22 and c(d) = 1.63 +/- 0.15 where c(u,d) = 4(g(V)2BAR + g(A)2BAR)u,d. Our results are consistent with standard model predictions.
Publisher
Elsevier Science Bv
Issue Date
1993-02
Language
ENG
Keywords

FINAL-STATE PHOTONS; LUND MONTE-CARLO; E+E ANNIHILATION; JET FRAGMENTATION; PHYSICS

Citation

PHYSICS LETTERS B, v.301, no.1, pp.136 - 144

ISSN
0370-2693
DOI
10.1016/0370-2693(93)90735-Z
URI
http://hdl.handle.net/10203/62399
Appears in Collection
PH-Journal Papers(저널논문)
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