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Barnett, B A; Beringer, J; Bisello, D; Bolshov, A; Boveia, A; Brau, B; Budroni, S; Caron, B; Castro, A; Cerri, A; Ciocci, M A; Daronco, S; D'Auria, S; Deisher, A; Demortier, L; Derwent, P F; Errede, S; Fedorko, I; Foster, G W; Gallinaro, M; Garcia, J E; Garfinkel, A F; Gay, C; Ginsburg, C; Goldschmidt, N; Goncharov, M; Grinstein, S; Hahn, K; Halkiadakis, E; Han, J Y; Harris, R M; Hatakeyama, K; Hill, C S; Hirschbuehl, D; Houlden, M; Hsu, S-C; Huffman, B T; Kato, Y; Klimenko, S; Ko, B R; Kraan, A C; Krutelyov, V; Laasanen, A T; Lai, S; Lee, J; Lee, Y J; Levy, S; Lin, C; Lipeles, E; Lukens, P; Lytken, E; Margaroli, F; Mattson, M E; McFarland, K S; Miao, T; Miladinovic, N; Mitselmakher, G; Moggi, N; Mohr, B; Fernandez, P Movilla; Mülmenstädt, J; Mukherjee, A; Naganoma, J; Napier, A; Nurse, E; Oldeman, R; Palencia, E; Pashapour, S; Pellett, D E; Penzo, A; Pitts, K; Pronko, A; Punzi, G; Reisert, B; Rescigno, M; Saltó, O; Schmitt, M; Seidel, S; Shapiro, M D; Smith, J R; Soderberg, M; Somalwar, S; Suh, J S; Sukhanov, A; Takashima, R; Thom, J; Tiwari, V; Tsuno, S; Unverhau, T; Vollrath, I; Wagner, P; Wagner, R L; Wagner, J; Whitehouse, B; Wu, X; Yang, U K; Yao, W M; Yu, S S; Zaw, I; Zhang, X
Physical review letters, 03/2007, Letnik: 98, Številka: 11Journal Article
We present the first observation of exclusive e(+)e(-) production in hadron-hadron collisions, using ppover collision data at (square root) s = 1.96 TeV taken by the run II Collider Detector at Fermilab, and corresponding to an integrated luminosity of 532 pb(-1). We require the absence of any particle signatures in the detector except for an electron and a positron candidate, each with transverse energy E(T) > 5 GeV and pseudorapidity |eta| < 2. With these criteria, 16 events are observed compared to a background expectation of 1.9+/-0.3 events. These events are consistent in cross section and properties with the QED process ppover --> p + e(+)e(-) + pover through two-photon exchange. The measured cross section is 1.6(-0.3)(+0.5)(stat) +/- 0.3(syst) pb. This agrees with the theoretical prediction of 1.71+/-0.01 pb.
