E. Fokitis
CERN
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Publication
Featured researches published by E. Fokitis.
Physics Letters B | 1985
P. Astbury; E. Augé; R. Barate; P. Bareyre; P. Benkheiri; Daniel Bloch; P. Bonamy; P. Borgeaud; B. Bouquet; J.M. Brom; J.M. Brunet; H. Burmeister; M. Burtchell; S. Costa Ramos; F. Couchot; B. D'Almagne; M. David; A. de Bellefon; A. De Lesquens; P. Dello Russo; A. Duane; J.P. Engel; J. Engelen; A. Ferrer; T.A. Filippas; E. Fokitis; P. Frenkiel; Evangelos Gazis; J. Giomataris; Maciej Górski
Abstract We present the first results on inclusive photo-production of prompt photons at high transverse momenta. The data were taken in an open spectrometer at CERN using a high intensity photon beam energy between 50 and 150 GeV. After subtracting the yield of photons from indirect sources, a clear excess is observed for transverse momenta above 2.5 GeV c Deep inelastic Compton scattering with appropriate QCD corrections account for this excess. The data disfavour the gauge integer charge quark models so far proposed.
Physics Letters B | 1986
E. Augé; R. Barate; Daniel Bloch; P. Bonamy; P. Borgeaud; G. De Bouard; B. Bouquet; J.M. Brunet; H. Burmeister; Mark J. Burchell; M. Cattaneo; S.Costa Ramos; B. Dalmagne; M. David; A. de Bellefon; A. de Lesquen; P. Dello Russo; J. Dixon; A. Duane; J.P. Engel; J. Engelen; A. Ferrer; T. A. Filippas; E. Fokitis; Evangelos Gazis; Y. Giomataris; J.L. Guyonnet; T. Hofmokl; Elias Katsoufis; J. Kent
Abstract The NA14 photoproduction experiment, carried out at the CERN SPS, has measured the inclusive cross section of events with a prompt photon at high p T in the final state. Here we present a study of the topology of the final state of these events. The topology differs from that observed for events with an identified π 0 in the same kinematical domain. Using these differences we have extracted the contribution from the Born term to the inclusive prompt photon cross section. The result is in good agreement with theoretical predictions and supports the assignment of a fractional electric charge to the quarks.
Physics Letters B | 1986
R. Barate; A. de Bellefon; Daniel Bloch; P. Bonamy; P. Borgeaud; B. Bouquet; J.M. Brunet; Mark J. Burchell; H. Burmeister; S.Costa Ramos; B. Dalmagne; M. David; P. Dello-Russo; A. Duane; J.P. Engel; J. Engelen; A. Ferrer; T. A. Filippas; E. Fokitis; P. Frenkiel; Evangelos Gazis; Y. Giomataris; P. Gregory; J.L. Guyonnet; T. Hofmokl; Elias Katsoufis; J. Kent; B. Lefievre; R. Legendre; Y. Lemoigne
Abstract A quantitative test of QCD from high energy photoproduction of large transverse momentum charged hadrons, using incident γ energies between 50 and 150 GeV, is presented. The inclusive hadron P 1 and P t distributions show a clear excess over the VDM contribution. This excess is found to be in good agreement with second-order QCD calculations. This agreement does not depend critically on the choice of the gluon fragmentation function, and is observed over the large kinematical domain covered by this experiment.
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