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Showing papers by "C. Conta published in 1990"

Journal Article•DOI•
Search for top quark production at the CERN $$\bar pp$$ collider

[...]

T. Åkesson1, J. Alitti, R. Ansari1, Richard E. Ansorge2, Paolo Bagnaia3, P. Bareyre, G. Blaylock3, P. Bonamy, M. Bonesini4, K. Borer5, D. Buskulie1, Giovanni Carboni6, D. Cavalli4, Vincenzo Cavasinni6, P. Cenci7, J. C. Chollet1, C. Conta8, G. Costa4, F. Costantini6, A. Dell'Acqua8, B. De Lotto8, T. Del Prete6, R. S. De Wolf2, L. Di Lella3, Gary F. Egan3, Kevin Einsweiler3, Louis Fayard1, Andrea Federspiel5, Roberto Ferrari8, Marco Fraternali8, D. Froidevaux1, G. Fumagalli3, J. M. Gaillard1, F. Gianotti4, O. Gildemeister3, Claus Gössling3, V. G. Goggi8, S. Grünendahl9, John H. L. Hansen3, K. Hara5, Sten Hellman3, E. Hugentobler5, K. Hultqvist3, E. Iacopini6, Joe Incandela3, Karl Jakobs3, Peter Jenni3, E. E. Kluge9, N. Kurz9, S. Lami6, Paolo Lariccia7, M. Lefebvre2, L. Linssen3, Michele Livan8, P. Lubrano3, C. Magneville, L. Mandelli4, Livio Mapelli3, Marcello Mazzanti4, K. Meier3, B. Merkel1, J-P. Meyer, M. Moniez1, R. Moning5, M. Morganti6, L. Müller5, D. J. Munday2, C. Onions3, T. Pal3, M. A. Parker3, G. Parrour1, F. Pastore8, E. Pennacchio8, J. M. Pentney2, M. Pepe7, Laura Perini4, Chariclia Petridou6, P. Petroff1, H. Plothow-Besch9, M. Primavera6, G. Polesello4, Alan Poppleton3, L. Rasmussen3, J. P. Repellin1, Adele Rimoldi8, John Gordon Rushbrooke2, Paola Scampoli7, J. Schacher5, S. L. Singh2, Steinar Stapnes3, A. V. Stirling, S.N. Tovey3, G. Unal1, M. Valdata-Nappi6, Valerio Vercesi3, A. R. Weidberg3, P. S. Wells2, T. O. White2, Darien Wood3, S. A. Wotton2, H. Zaccone •
University of Paris1, University of Cambridge2, CERN3, University of Milan4, University of Bern5, University of Pisa6, University of Perugia7, University of Pavia8, Heidelberg University9
01 Jun 1990-European Physical Journal C
TL;DR: The UA 2 detector has collected data corresponding to a total integrated luminosity of 7.5 pb−1 from collisions at a center of mass energy of 630 GeV during 1988 and 1989.
Abstract: The upgraded UA 2 detector has collected data corresponding to a total integrated luminosity of 7.5 pb−1 from\(\bar pp\) collisions at a centre of mass energy of 630 GeV during 1988 and 1989. A search has been performed for the production and decay of the top quark (t) or a member of a hypothetical fourth family (b′). No evidence has been found for such processes. Using the expected rates for production and decay branching ratios from the Standard Model, this implies that the top quark mass is greater than 69(71) GeV/c2, and that theb′ mass is greater than 54(57) GeV/c2, at 95(90)% confidence.

23 citations

Journal Article•DOI•
Measurement ofW andZ production cross sections at the CERN\(\bar p\)p collider

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J. Alitti, R. Ansari1, Richard E. Ansorge2, Paolo Bagnaia3, P. Bareyre, G. Blaylock3, P. Bonamy, M. Bonesini4, C. N. Booth3, K. Borer5, D. Buskulic1, Giovanni Carboni6, D. Cavalli4, Vincenzo Cavasinni6, P. Cenci7, J. C. Chollet1, C. Conta8, G. Costa4, F. Costantini6, F. Costantini3, J. Crittenden, A. Dell'Acqua8, B. DeLotto8, T. DelPrete6, R. S. DeWolf2, L. DiLella3, Gary F. Egan3, Kevin Einsweiler3, Louis Fayard1, Andrea Federspiel5, Roberto Ferrari8, Marco Fraternali8, D. Froidevaux1, G. Fumagalli8, G. Fumagalli3, J. M. Gaillard1, F. Gianotti4, O. Gildemeister3, Claus Gössling3, V. G. Goggi8, V. G. Goggi3, S. Grünendahl9, K. Hara5, Sten Hellman3, E. Hugentobler5, K. Hultqvist3, E. Iacopini6, Joe Incandela3, Karl Jakobs3, Peter Jenni3, E. E. Kluge9, N. Kurz9, S. Lami6, S. Lami9, Paolo Lariccia7, Michel Lefebvre2, Michel Lefebvre3, L. Linssen3, B. Lisowski3, Michele Livan8, P. Lubrano3, C. Magneville, L. Mandelli4, Livio Mapelli3, Marcello Mazzanti4, K. Meier3, B. Merkel1, J-P. Meyer, M. Moniez1, R. Moning5, M. Morganti6, L. Müller5, D. J. Munday2, C. Onions3, T. Pal3, T. Pal5, M. A. Parker3, G. Parrour1, F. Pastore8, E. Pennacchio8, J. M. Pentney2, M. Pepe7, Laura Perini4, Chariclia Petridou6, P. Petroff1, H. Plothow-Besch9, G. Polesello4, Alan Poppleton3, M. Punturo7, L. Rasmussen3, J. P. Repellin1, Adele Rimoldi8, John Gordon Rushbrooke2, Paola Scampoli7, J. Schacher5, S. L. Singh2, Steinar Stapnes3, A. V. Stirling, F. Tondini6, F. Tondini7, S.N. Tovey3, E. Tsesmelis10, M. Valdata-Nappi6, Valerio Vercesi3, Valerio Vercesi8, A. R. Weidberg3, P. S. Wells2, T. O. White2, Darien Wood3, S. A. Wotton2, H. Zaccone •
University of Paris1, University of Cambridge2, CERN3, University of Milan4, University of Bern5, University of Pisa6, University of Perugia7, University of Pavia8, Heidelberg University9, University of Melbourne10
01 Mar 1990-European Physical Journal C
TL;DR: In this paper, the production cross sections of W and Z bosons detected in the UA2 experiment are given based on a large sample of W→eν and Z→e+¯¯¯¯e−decays.
Abstract: Results on the production cross sections ofW andZ bosons detected in the UA2 experiment are given based on a large sample ofW→eν andZ→e + e − decays. The measured cross sections are σ = 660±15(stat)±37(syst)pb, σ = 70.4±5.5(stat)±4.0(syst)pb and their ratioR=9.38 −0.72 +0.82 (stat)±0.25(syst). In the framework of the Standard Model, the measured value ofR is used to determine the total width of theW, Γ(W)=2.30±0.19(stat)±0.06(syst) GeV.

22 citations

Journal Article•DOI•
Measurement of the transverse momentum distributions ofW andZ bosons at the CERN\(\bar pp\) collider

[...]

J. Alitti, R. Ansari1, Richard E. Ansorge2, D. Autiero3, Paolo Bagnaia4, P. Bareyre, G. Blaylock4, P. Bonamy, M. Bonesini5, M. Bonesini4, C. N. Booth4, K. Borer6, D. Buskulic1, Giovanni Carboni3, D. Cavalli5, Vincenzo Cavasinni3, P. Cenci7, J. C. Chollet1, C. Conta8, G. Costa5, F. Costantini3, F. Costantini4, A. Dell'Acqua8, B. DeLotto8, T. DelPrete3, R. S. DeWolf2, L. DiLella4, Gary F. Egan4, Kevin Einsweiler4, Louis Fayard1, Andrea Federspiel6, Roberto Ferrari8, Marco Fraternali8, D. Froidevaux1, G. Fumagalli4, G. Fumagalli8, J. M. Gaillard1, F. Gianotti5, O. Gildemeister4, Claus Gössling4, V. G. Goggi4, V. G. Goggi8, S. Grünendahl9, K. Hara6, Sten Hellman4, E. Hugentobler6, K. Hultqvist4, E. Iacopini3, Joe Incandela4, Karl Jakobs4, Peter Jenni4, E. E. Kluge9, N. Kurz9, S. Lami3, S. Lami9, Paolo Lariccia7, Michel Lefebvre2, Michel Lefebvre4, L. Linssen4, Michele Livan8, P. Lubrano4, C. Magneville, L. Mandelli5, Livio Mapelli4, Marcello Mazzanti5, K. Meier4, B. Merkel1, J-P. Meyer, M. Moniez1, R. Moning6, M. Morganti3, L. Müller6, D. J. Munday2, C. Onions4, T. Pal4, T. Pal6, M. A. Parker4, G. Parrour1, F. Pastore8, E. Pennacchio8, J. M. Pentney2, M. Pepe7, Laura Perini5, Chariclia Petridou3, P. Petroff1, H. Plothow-Besch9, G. Polesello5, G. Polesello4, Alan Poppleton4, M. Primavera3, L. Rasmussen4, J. P. Repellin1, Adele Rimoldi8, Paola Scampoli7, J. Schacher6, S. L. Singh2, Steinar Stapnes4, A. V. Stirling, S.N. Tovey4, M. Valdata-Nappi3, Valerio Vercesi8, Valerio Vercesi4, A. R. Weidberg4, P. S. Wells2, T. O. White2, Darien Wood4, S. A. Wotton2, H. Zaccone •
University of Paris1, University of Cambridge2, University of Pisa3, CERN4, University of Milan5, University of Bern6, University of Perugia7, University of Pavia8, Heidelberg University9
23 Apr 1990-European Physical Journal C
TL;DR: In this paper, the transverse momentum distributions of W and Z bosons produced in collisions at poly(n) = 630 GeV were examined, and good agreement was found with QCD predictions.
Abstract: The transverse momentum distributions ofW andZ bosons produced in\(\bar pp\) collisions at\(\sqrt s = 630 GeV\) are examined. Comparisons are made with QCD predictions, and good agreement is found. The fraction ofW bosons produced withpT>25 GeV is found to be 3.8±0.6(stat)−1.3+0.9(syst)%.

14 citations