| Contributors: |
Abreu, P; Adam, W; Adye, T; Adzic, P; Ajinenko, I; Albrecht, Z; Alderweireld, T; Alekseev, Gd; Alemany, R; Allmendinger, T; Allport, Pp; Almehed, S; Amaldi, U; Amapane, N; Amato, S; Anassontzis, Eg; Andersson, P; Andreazza, A; Andringa, S; Antilogus, P; Apel, Wd; Arnoud, Y; Asman, B; Augustin, Je; Augustinus, A; Baillon, P; Bambade, P; Barao, F; Barbiellini, G; Barbier, R; Bardin, Dy; Barker, G; Baroncelli, A; Battaglia, M; Baubillier, M; Becks, Kh; Begalli, M; Behrmann, A; Beilliere, P; Belokopytov, Y; Benekos, Nc; Benvenuti, Ac; Berat, C; Berggren, M; Bertrand, D; Besancon, M; Bigi, M; Bilenky, M; Bizouard, Ma; Bloch, D; Blom, Hm; Bonesini, M; Boonekamp, M; Booth, Psl; Borgland, Aw; Borisov, G; Bosio, C; Botner, O; Boudinov, E; Bouquet, B; Bourdarios, C; Bowcock, Tjv; Boyko, I; Bozovic, I; Bozzo, M; Bracko, M; Branchini, P; Brenner, Ra; Bruckman, P; Brunet, Jm; Bugge, L; Buran, T; Buschbeck, B; Buschmann, P; Cabrera, S; Caccia, M; Calvi, M; Camporesi, T; Canale, V; Carena, F; Carroll, L; Caso, C; Gimenez, Mvc; Cattai, A; Cavallo, Fr; Chabaud, V; Charpentier, P; Checchia, P; Chelkov, Ga; Chierici, R; Chliapnikov, P; Chochula, P; Chorowicz, V; Chudoba, J; Cieslik, K; Collins, P; Contri, R; Cortina, E; Cosme, G; Cossutti, F |
| Description: |
Muon pair production in the process e(+)e(-) --> e(+)e(-)mu (+)mu (-) is studied using the data taken at LEP1 (roots similar or equal to m(Z)) with the DELPHI detector during the years 1992-1995. The corresponding integrated luminosity is 138.5 pb(-1). The QED predictions have been tested over the whole Q(2) range accessible at LEP1 (from several GeV2/c(4) to several hundred GeV2/c(4)) by comparing experimental distributions with distributions resulting from Monte Carlo simulations using various generators. Selected events are used to extract the leptonic photon structure function F-2(gamma). Azimuthal correlations are used to obtain information on additional structure functions, F-A(gamma) and F-B(gamma), which originate from interference terms of the scattering amplitudes. The measured ratios F-A(gamma)/F-2(gamma) and F-B(gamma)/F-2(gamma) are significantly different from zero and consistent with QED predictions. RI Ragazzi, Stefano/D-2463-2009; Gonzalez Caballero, Isidro/E-7354-2010; Krammer, Manfred/A-6508-2010; Muresan, Raluca-Anca/C-3725-2011; Katsanevas, Stavros/A-4297-2011; Ruiz, Alberto/E-4473-2011; Andreazza, Attilio/E-5642-2011; Marti-Garcia, Salvador/F-3085-2011; Verzi, Valerio/B-1149-2012; branchini, paolo/A-4857-2011; Shellard, Ronald/G-4825-2012; Petrolini, Alessandro/H-3782-2011; Fruhwirth, Rudolf/H-2529-2012; Monge, Maria Roberta/G-9127-2012 |