DETERMINATION OF QUARK ELECTROWEAK COUPLINGS FROM DIRECT PHOTON PRODUCTION IN HADRONIC Z-DECAYS
- ADRIANI, O
- AGUILARBENITEZ, M
- AHLEN, S
- ALCARAZ, J
- ALOISIO, A
- ALVERSON, G
- ALVIGGI, M
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- CRIJNS, F
- CUI, X
- CUI, X
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- DALESSANDRO, R
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- DENOTARISTEFANI, F
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- FILTHAUT, F
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- ZACCARDELLI, C
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- ZENG, M
- ZENG, Y
- ZHANG, D
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- ZHU, R
- ZHUANG, H
- ZICHICHI, A
- VANDERZWAAN, B
Publication date
February 1993
DOI Publisher
Elsevier BV Journal
Physics Letters BAbstract
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 cu = 0.92 ± 0.22 and cd = 1.63 ± 0.15 where cu,d = 4(gV2 + gA2)u,d. Our results are consistent with standard model predictions. © 1993
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