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Di-Jet Production in Photon-Photon colisions at $\sqrt{s_{ee}}$ from 189 to 209 GeV

Authors :
Abbiendi, G.
Ainsley, C.
Akesson, P.F.
Alexander, G.
Allison, John
Amaral, P.
Anagnostou, G.
Anderson, K.J.
Arcelli, S.
Asai, S.
Axen, D.
Azuelos, G.
Bailey, I.
Barberio, E.
Barlow, R.J.
Batley, R.J.
Bechtle, P.
Behnke, T.
Bell, Kenneth Watson
Bell, P.J.
Bella, G.
Bellerive, A.
Benelli, G.
Bethke, S.
Biebel, O.
Bloodworth, I.J.
Boeriu, O.
Bock, P.
Bonacorsi, D.
Boutemeur, M.
Braibant, S.
Brigliadori, L.
Brown, Robert M.
Buesser, K.
Burckhart, H.J.
Campana, S.
Carnegie, R.K.
Caron, B.
Carter, A.A.
Carter, J.R.
Chang, C.Y.
Charlton, David G.
Csilling, A.
Cuffiani, M.
Dado, S.
Dallison, S.
De Roeck, A.
De Wolf, E.A.
Desch, K.
Dienes, B.
Donkers, M.
Dubbert, J.
Duchovni, E.
Duckeck, G.
Duerdoth, I.P.
Elfgren, E.
Etzion, E.
Fabbri, F.
Feld, L.
Ferrari, P.
Fiedler, F.
Fleck, I.
Ford, M.
Frey, A.
Furtjes, A.
Gagnon, P.
Gary, John William
Gaycken, G.
Geich-Gimbel, C.
Giacomelli, G.
Giacomelli, P.
Giunta, Marina
Goldberg, J.
Gross, E.
Grunhaus, J.
Gruwe, M.
Gunther, P.O.
Gupta, A.
Hajdu, C.
Hamann, M.
Hanson, G.G.
Harder, K.
Harel, A.
Harin-Dirac, M.
Hauschild, M.
Hauschildt, J.
Hawkes, C.M.
Hawkings, R.
Hemingway, R.J.
Hensel, C.
Herten, G.
Heuer, R.D.
Hill, J.C.
Hoffman, Kara Dion
Homer, R.J.
Horvath, D.
Howard, R.
Igo-Kemenes, P.
Ishii, K.
Jeremie, H.
Jovanovic, P.
Junk, T.R.
Kanaya, N.
Kanzaki, J.
Karapetian, G.
Karlen, D.
Kartvelishvili, V.
Kawagoe, K.
Kawamoto, T.
Keeler, R.K.
Kellogg, R.G.
Kennedy, B.W.
Kim, D.H.
Klein, K.
Klier, A.
Kluth, S.
Kobayashi, T.
Kobel, M.
Komamiya, S.
Kormos, Laura L.
Kramer, T.
Kress, T.
Krieger, P.
von Krogh, J.
Krop, D.
Kruger, K.
Kuhl, T.
Kupper, M.
Lafferty, G.D.
Landsman, H.
Lanske, D.
Layter, J.G.
Leins, A.
Lellouch, D.
Lettso, J.
Levinson, L.
Lillich, J.
Lloyd, S.L.
Loebinger, F.K.
Lu, J.
Ludwig, J.
Macpherson, A.
Mader, W.
Marcellini, S.
Marchant, T.E.
Martin, A.J.
Martin, J.P.
Masetti, G.
Mashimo, T.
Mattig, Peter
McDonald, W.J.
McKenna, J.
McMahon, T.J.
McPherson, R.A.
Meijers, F.
Mendez-Lorenzo, P.
Menges, W.
Merritt, F.S.
Mes, H.
Michelini, A.
Mihara, S.
Mikenberg, G.
Miller, D.J.
Moed, S.
Mohr, W.
Mori, T.
Mutter, A.
Nagai, K.
Nakamura, I.
Neal, H.A.
Nisius, R.
O'Neale, S.W.
Oh, A.
Okpara, A.
Oreglia, M.J.
Orito, S.
Pahl, C.
Pasztor, G.
Pater, J.R.
Patrick, G.N.
Pilcher, J.E.
Pinfold, J.
Plane, David E.
Poli, B.
Polok, J.
Pooth, O.
Przybycien, M.
Quadt, A.
Rabbertz, K.
Rembser, C.
Renkel, P.
Rick, H.
Roney, J.M.
Rosati, S.
Rozen, Y.
Runge, K.
Sachs, K.
Saeki, T.
Sahr, O.
Sarkisyan, E.K.G.
Schaile, A.D.
Schaile, O.
Scharff-Hansen, P.
Schieck, J.
Schoerner-Sadenius, Thomas
Schroder, Matthias
Schumacher, M.
Schwick, C.
Scott, W.G.
Seuster, R.
Shears, T.G.
Shen, B.C.
Sherwood, P.
Siroli, G.
Skuja, A.
Smith, A.M.
Sobie, R.
Soldner-Rembold, S.
Spano, F.
Stahl, A.
Stephens, K.
Strom, David M.
Strohmer, R.
Tarem, S.
Tasevsky, M.
Taylor, R.J.
Teuscher, R.
Thomson, M.A.
Torrence, E.
Toya, D.
Tran, P.
Trefzger, T.
Tricoli, A.
Trigger, I.
Trocsanyi, Z.
Tsur, E.
Turner-Watson, M.F.
Ueda, I.
Ujvari, B.
Vachon, B.
Vollmer, C.F.
Vannerem, P.
Verzocchi, M.
Voss, H.
Vossebeld, J.
Waller, D.
Ward, C.P.
Ward, D.R.
Watkins, P.M.
Watson, A.T.
Watson, N.K.
Wells, P.S.
Wengler, T.
Wermes, N.
Wetterling, D.
Wilson, G.W.
Wilson, J.A.
Wolf, G.
Wyatt, T.R.
Yamashita, S.
Zer-Zion, D.
Zivkovic, Lidija
Publication Year :
2002

Abstract

Di-jet producion is studied in collisions of quasi-real photons at e+e- centre- of-mass energies sqrt(s)ee from 189 to 209 GeV at LEP. The data were collected with the OPAL detector. Jets are reconstructed using an inclusive k_t clustering algorithm for all cross-section measurements presented. A cone jet algorithm is used in addition to study the different structure of the jets resulting from either of the algorithms. The inclusive di-jet cross-section is measured as a function of the mean transverse energy Etm(jet) of the two leading jets, and as a functiuon of the estimated fraction of the photon momentum carried by the parton entering the hard sub-process, xg, for different regions of Etm (jet). Angular distribution in di-jet events are measured and used to demonstrate the dominance of quark and gluon initiated processes in different regions of phase space. Furthermore the inclusive di-jet cross-section as a function of |eta(jet)| and |delta eta (jet)| is presented where eta(jet) is the jet pseudo-rapidity. Different regions of the xg+ -xg- -space are explored to study and control the influence of an underlying event. The results are compared to next-to-leading order perturbative QCD calculations and to the predictions of the leading order Monte Carlo generator PYTHIA. Di-jet producion is studied in collisions of quasi-real photons at e+e- centre- of-mass energies sqrt(s)ee from 189 to 209 GeV at LEP. The data were collected with the OPAL detector. Jets are reconstructed using an inclusive k_t clustering algorithm for all cross-section measurements presented. A cone jet algorithm is used in addition to study the different structure of the jets resulting from either of the algorithms. The inclusive di-jet cross-section is measured as a function of the mean transverse energy Etm(jet) of the two leading jets, and as a functiuon of the estimated fraction of the photon momentum carried by the parton entering the hard sub-process, xg, for different regions of Etm (jet). Angular distribution in di-jet events are measured and used to demonstrate the dominance of quark and gluon initiated processes in different regions of phase space. Furthermore the inclusive di-jet cross-section as a function of |eta(jet)| and |delta eta (jet)| is presented where eta(jet) is the jet pseudo-rapidity. Different regions of the xg+ -xg- -space are explored to study and control the influence of an underlying event. The results are compared to next-to-leading order perturbative QCD calculations and to the predictions of the leading order Monte Carlo generator PYTHIA. Di-jet producion is studied in collisions of quasi-real photons at e+e- centre- of-mass energies sqrt(s)ee from 189 to 209 GeV at LEP. The data were collected with the OPAL detector. Jets are reconstructed using an inclusive k_t clustering algorithm for all cross-section measurements presented. A cone jet algorithm is used in addition to study the different structure of the jets resulting from either of the algorithms. The inclusive di-jet cross-section is measured as a function of the mean transverse energy Etm(jet) of the two leading jets, and as a functiuon of the estimated fraction of the photon momentum carried by the parton entering the hard sub-process, xg, for different regions of Etm (jet). Angular distribution in di-jet events are measured and used to demonstrate the dominance of quark and gluon initiated processes in different regions of phase space. Furthermore the inclusive di-jet cross-section as a function of |eta(jet)| and |delta eta (jet)| is presented where eta(jet) is the jet pseudo-rapidity. Different regions of the xg+ -xg- -space are explored to study and control the influence of an underlying event. The results are compared to next-to-leading order perturbative QCD calculations and to the predictions of the leading order Monte Carlo generator PYTHIA.

Details

Language :
English
Database :
OpenAIRE
Accession number :
edsair.od........65..cb3afec1800c49d6df31fb9f9ba128e4