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1. A measurement of the W and Z production cross sections and a determination of Γw at the CERN [ovbar|p]p collider

Author

E. Tsesmelis, E. Pennacchio, J. Incandela, E. Hugentobler, P. Lubrano, M. Valdata-Nappi, A. Dell'Acqua, L. Linssen, A. R. Weidberg, I.A. Bertram, H. Hufnagel, Daniel Froidevaux, Roberto Ferrari, M. Punturo, K. Meier, R. Moning, C. Magneville, J. Alitti, M. Moniez, B. Schmidt, J. C. Chollet, Kevin Einsweiler, V. G. Goggi, Francesca Nessi-Tedaldi, G. Amrosini, Steinar Stapnes, J.M. Pentney, A. Cravero, F. Costantini, Alan Poppleton, M. Morganti, Marcello Mazzanti, R. S. DeWolf, Michel Lefebvre, M. Bourliaud, Paola Scampoli, Livio Mapelli, G. Blaylock, Marco Fraternali, J. Schacher, G. Costa, J. Hřiv'ač, Marzio Nessi, Y. Ducros, D. J. Munday, R. Spiwoks, S. N. Tovey, G. Parrour, K. Hara, Michele Livan, Laura Perini, Giovanni Carboni, H. Plothow-Besch, E. Iacopini, G. Unal, Cinzia Talamonti, C. Onions, T. Pal, O. Gildemeister, S. L. Singh, J-P. Meyer, N. Kurz, Vincenzo Cavasinni, Andrea Federspiel, P. Petroff, P. S. Wells, Chariclia Petridou, G. Polesello, Paolo Lariccia, J. P. Repellin, F. Pastore, Sten Hellman, B. Esposito, D. Buskulic, Karl Jakobs, G. Fumagalli, D. Cavalli, Adele Rimoldi, T. O. White, M. Primavera, L. Mandelli, S. Lami, Claus Gössling, K. Borer, A. Zylberstejn, F. Tondini, P. Bareyre, B. Merkel, E. E. Kluge, M. Curatolo, S. A. Wotton, D. Autiero, K. Hultqvist, J. M. Gaillard, L. DiLella, Peter Jenni, Michael Andrew Parker, Darien Wood, C. Conta, Luca Cozzi, Louis Fayard, R. Ansari, Gary F. Egan, Massimiliano F. Sacchi, P. Cenci, S. Grünendahl, M. Pepe, V. Sondermann, L. Müller, T. DelPrete, V. Simak, Valerio Vercesi, F. Gianotti, H. Zaccone, P. Bonamy, Klaus Peter Pretzl, J., Alitti, G., Ambrosini, R., Ansari, D., Autiero, P., Bareyre, I. A., Bertram, G., Blaylock, P., Bonamy, K., Borer, M., Bourliaud, D., Buskulic, G., Carboni, D., Cavalli, V., Cavasinni, P., Cenci, J. C., Chollet, C., Conta, G., Costa, F., Costantini, L., Cozzi, A., Cravero, M., Curatolo, A., Dellacqua, T., Delprete, R. S., Dewolf, L., Dilella, Y., Ducro, G. F., Egan, K. F., Einsweiler, B., Esposito, L., Fayard, A., Federspiel, R., Ferrari, M., Fraternali, D., Froidevaux, G., Fumagalli, J. M., Gaillard, F., Gainotti, O., Gildemeister, C., Gossling, V. G., Goggi, S., Grunendahl, K., Hara, S., Hellman, J., Hrivnac, H., Hufnagel, E., Hugentobler, K., Hultqvist, E., Iacopini, J., Incandela, K., Jakob, P., Jenni, E. E., Kluge, N., Kurz, S., Lami, P., Lariccia, M., Lefebvre, L., Linssen, M., Livan, P., Lubrano, C., Magneville, L., Mandelli, L., Mapelli, M., Mazzanti, K., Meier, B., Merkel, J. P., Meyer, M., Moniez, R., Moning, M., Morganti, L., Muller, D. J., Munday, M., Nessi, F., Nessitedaldi, C., Onion, T., Pal, M. A., Parker, G., Parrour, F., Pastore, E., Pennacchio, J. M., Pentney, M., Pepe, L., Perini, C., Petridou, P., Petroff, H., Plothowbesch, G., Polesello, A., Poppleton, K., Pretzl, M., Primavera, M., Punturo, J. P., Repellin, A., Rimoldi, M., Sacchi, Scampoli, Paola, J., Schacher, B., Schmidt, V., Simak, S. L., Singh, V., Sondermann, R., Spiwok, S., Stapne, C., Talamonti, F., Tondini, S. N., Tovey, E., Tsesmeli, G., Unal, M., Valdatanappi, V., Vercesi, A. R., Weidberg, P. S., Well, T. O., White, D. R., Wood, S. A., Wotton, H., Zaccone, and A., Zylberstejn

Subjects
Physics, Nuclear and High Energy Physics, Top quark, Particle physics, Branching fraction, Elementary particle, Nuclear physics, Particle decay, Pair production, Antimatter, UA2 EXPERIMENT, SCINTILLATING FIBER DETECTOR, B' QUARKS, Particle Physics - Experiment, Lepton, Boson
Abstract

The decays W --> ev and Z --> e+e- are studied in ppBAR collisions at square-root s = 630 GeV. The products of production cross section and branching ratio are measured as sigma(W)e = 682 +/- 12 +/- 40 pb and sigma(Z)e = 65.6 +/- 4.0 +/- 3.8 pb. The results are in good agreement with O (alpha(s)2) calculations of the production cross sections. Many systematic effects cancel in the ratio, R = 10.4 +/- 0.6(0.7) +/- 0.3, which can be used to give an indirect measurement of the total width of the W boson: GAMMA(W) = 2.10 +/- 0.13 +/- 0.09 GeV. The width gives a limit on the top quark mass, m(top) > 53 GeV (95% CL), which is independent of the top decay mode.

Published
1992
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2. Study of electron pair production below the Z mass at the CERN p collider

Author

O. Gildemeister, J. Incandela, Sten Hellman, G. Polesello, J. Schacher, J-P. Meyer, C. Onions, Chariclia Petridou, P. Petroff, Karl Jakobs, Giovanna Ambrosini, K. Borer, G. Fumagalli, E. Tsesmelis, R. Moning, E. Hugentobler, G. Costa, G. Parrour, Gary F. Egan, M. Valdata-Nappi, H. Hufnagel, M. Moniez, Julius Hrivnac, M. Curatolo, Michele Livan, M. Pepe, S. N. Tovey, V. G. Goggi, P. Bonamy, J. M. Gaillard, J.M. Pentney, Cinzia Talamonti, Marcello Mazzanti, P. S. Wells, E. Iacopini, Michael Andrew Parker, V. Simak, K. Hara, I.A. Bertram, Darien Wood, G. Blaylock, L. Mandelli, Stefan Gruenendahl, Giovanni Carboni, C. Conta, V. Sondermann, Vincenzo Cavasinni, F. Tondini, Valerio Vercesi, F. Gianotti, Laura Perini, T. O. White, L. Müller, M. Punturo, S. L. Singh, Luca Cozzi, T. Pal, F. Pastore, J. Alitti, B. Schmidt, P. Bareyre, T. Del Prete, Michel Lefebvre, M. Bourliaud, Daniel Froidevaux, H. Zaccone, Paola Scampoli, J. P. Repellin, Marco Fraternali, N. Kurz, Steinar Stapnes, R. S. DeWolf, A. R. Weidberg, K. Meier, C. Magneville, F. Costantini, Klaus Peter Pretzl, D. J. Munday, Kevin Einsweiler, D. Cavalli, H. Plothow-Besch, Andrea Federspiel, Paolo Lariccia, Louis Fayard, E. Pennacchio, A. Dell'Acqua, R. Ansari, Massimiliano F. Sacchi, Y. Ducros, Francesca Nessi-Tedaldi, M. Primavera, Claus Gössling, A. Cravero, A. Zylberstejn, B. Merkel, P. Cenci, D. Auterio, Adele Rimoldi, L. Di Lella, S. Lami, S. A. Wotton, K. Hultqvist, Peter Jenni, Roberto Ferrari, J. C. Chollet, R. Spiwoks, G. Unal, B. Esposito, D. Buskulic, E. E. Kluge, M. Morganti, Marzio Nessi, Alan Poppleton, Livio Mapelli, P. Lubrano, L. Linssen, J., Alitti, G., Ambrosini, R., Ansari, D., Autiero, P., Bareyre, I. A., Bertram, G., Blaylock, P., Bonamy, K., Borer, M., Bourliaud, D., Buskulic, G., Carboni, D., Cavalli, V., Cavasinni, P., Cenci, J. C., Chollet, C., Conta, G., Costa, F., Costantini, L., Cozzi, A., Cravero, M., Curatolo, A., Dellacqua, T., Delprete, R. S., Dewolf, L., Dilella, Y., Ducro, G. F., Egan, K. F., Einsweiler, B., Esposito, L., Fayard, A., Federspiel, R., Ferrari, M., Fraternali, D., Froidevaux, G., Fumagalli, J. M., Gaillard, F., Gianotti, O., Gildemeister, C., Gossling, V. G., Goggi, S., Grunendahl, K., Hara, S., Hellman, J., Hrivnac, H., Hufnagel, E., Hugentobler, K., Hultqvist, E., Iacopini, J., Incandela, K., Jakob, P., Jenni, E. E., Kluge, N., Kurz, S., Lami, P., Lariccia, M., Lefebvre, L., Linssen, M., Livan, P., Lubrano, C., Magneville, L., Mandelli, L., Mapelli, M., Mazzanti, K., Meier, B., Merkel, J. P., Meyer, M., Moniez, R., Moning, M., Morganti, L., Muller, D. J., Munday, M., Nessi, F., Nessitedaldi, C., Onion, T., Pal, M. A., Parker, G., Parrour, F., Pastore, E., Pennacchio, J. M., Pentney, M., Pepe, L., Perini, C., Petridou, P., Petroff, H., Plothowbesch, G., Polesello, A., Poppleton, K., Pretzl, M., Primavera, M., Punturo, J. P., Repellin, A., Rimoldi, M., Sacchi, Scampoli, Paola, J., Schacher, B., Schmidt, V., Simak, S. L., Singh, V., Sondermann, R., Spiwok, S., Stapne, C., Talamonti, F., Tondini, S. N., Tovey, E., Tsesmeli, G., Unal, M., Valdatanappi, V., Vercesi, A. R., Weidberg, P. S., Well, T. O., White, D. R., Wood, S. A., Wotton, H., Zaccone, and A., Zylberstejn

Subjects
Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Electron pair, Particle physics, Large Hadron Collider, Drell–Yan process, law.invention, Nuclear physics, Cross section (physics), law, UA2 EXPERIMENT, High Energy Physics::Experiment, Invariant mass, Nuclear Experiment, Collider, PROTON-NUCLEUS COLLISIONS, Scaling
Abstract

Results on the cross section for the production of electron pairs in ppBAR collisions at square-root s = 630 GeV are presented. The measured value is sigma = 405 +/- 51 (syst.) +/- 84 (syst.) pb, in the invariant mass interval 10 < m < 70 GeV. The results are compared to recent theoretical calculations which include O(alpha(s)2) QCD contributions. The comparison of these data with those of lower energy experiments show approximate scaling as a function of the variable square-root tau = m/ square-root s.

Published
1992
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3. Measurement of the gluon structure function from direct photon data at the CERN p collider

Author

S. Grünendahl, Francesca Nessi-Tedaldi, A. Cravero, Julius Hrivnac, C. Onions, Steinar Stapnes, P. Petroff, V. Sondermann, R. S. DeWolf, P. Bonamy, R. Spiwoks, S. L. Singh, Klaus Peter Pretzl, L. Müller, Gary F. Egan, M. Curatolo, G. Unal, Michel Lefebvre, M. Bourliaud, Paola Scampoli, Marco Fraternali, D. J. Munday, H. Zaccone, Laura Perini, Marzio Nessi, Giovanna Ambrosini, Adele Rimoldi, Michael Andrew Parker, L. Mandelli, B. Esposito, M. Pepe, Darien Wood, J.-M. Gaillard, D. Buskulic, K. Jacobs, V. G. Goggi, J. Schacher, Giacomo Polesello, J. P. Repellin, F. Tondini, S. N. Tovey, E. Tsesmelis, P. Lubrano, L. Linssen, J.M. Pentney, P. Bareyre, Andrea Dell'Acqua, P. S. Wells, E. Iacopini, J-P. Meyer, Chariclia Petridou, D. Cavalli, H. Hufnagel, H. Plothow-Besch, S. Lami, E. Hugentobler, Giovanni Carboni, Andrea Federspiel, N. Kurz, A. R. Weidberg, Vincenzo Cavasinni, S. A. Wotton, K. Hultqvist, Paolo Lariccia, K. Hara, M. Primavera, M. Valdata-Nappi, Y. Ducros, L. DiLella, F. Pastore, M. Punturo, A. Zylberstejn, Sten Hellman, Peter Jenni, J. Alitti, Marcello Mazzanti, K. Borer, R. Ansari, Roberto Ferrari, Massimiliano F. Sacchi, C. Conta, J. C. Chollet, G. Blaylock, B. Merkel, P. Cenci, Luca Cozzi, Louis Fayard, I.A. Bertram, E. Pennacchio, Alan Poppleton, Daniel Froidevaux, Kevin Einsweiler, K. Meier, Livio Mapelli, Cinzia Talamonti, L. Malgeri, T. Pal, D. Autiero, T. DelPrete, G. Parrour, Claus Gössling, T. O. White, V. Simak, Valerio Vercesi, F. Gianotti, C. Magneville, Michele Livan, B. Schmidt, F. Costantini, E. E. Kluge, M. Morganti, O. Gildemeister, G. Fumagalli, G. Costa, M. Moniez, J. Incandela, and R. Moning

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Photon, Luminosity (scattering theory), Scattering, Deep inelastic scattering, Photon structure function, law.invention, Gluon, Nuclear physics, law, High Energy Physics::Experiment, Nuclear Experiment, Collider
Abstract

A measurement of the gluon structure fusion using direct photon events observed with the UA2 detector in p p collisions at √ s =630 GeV is presented. The x -range covered by this analysis is between 0.049 and 0.207 and the Q 2 range is between 280 GeV 2 and 3670 GeV 2 . The data sample corresponds to an integrated luminosity of 7.14 pb −1 . The results are found to be in good agreement with the gluon distributions measured in deep inelastic scattering experiments extrapolated to the UA2 Q 2 values.

Published
1993
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4. Experimental limit on the decay W±→π±γ at the CERN > collider

Author

Roberto Ferrari, J. C. Chollet, V. Simak, Steinar Stapnes, R. S. DeWolf, D. J. Munday, Valerio Vercesi, H. Plothow-Besch, F. Gianotti, Michele Livan, Andrea Federspiel, Paolo Lariccia, M. Morganti, J-P. Meyer, Chariclia Petridou, F. Tondini, Julius Hrivnac, R. Ansari, P. Bareyre, Michel Lefebvre, M. Bourliaud, Paola Scampoli, Marco Fraternali, Massimiliano F. Sacchi, H. Zaccone, B. Schmidt, M. Primavera, A. Zylberstejn, M. Moniez, G. Parrour, V. G. Goggi, M. Pepe, C. Magneville, H. Hufnagel, E. Tsesmelis, F. Costantini, P. Bonamy, M. Curatolo, B. Merkel, Alan Poppleton, Livio Mapelli, S. Grünendahl, J.M. Pentney, E. Hugentobler, Marcello Mazzanti, T. DelPrete, M. Valdata-Nappi, J. M. Gaillard, Giovanna Ambrosini, O. Gildemeister, K. Hara, G. Blaylock, M. Punturo, S. A. Wotton, K. Hultqvist, J. Schacher, Klaus Peter Pretzl, V. Sondermann, G. Polesello, Louis Fayard, S. L. Singh, C. Onions, P. Petroff, Michael Andrew Parker, L. DiLella, J. Alitti, L. Müller, Gary F. Egan, Laura Perini, J. Incandela, P. S. Wells, Karl Jakobs, Giovanni Carboni, Francesca Nessi-Tedaldi, D. Cavalli, Adele Rimoldi, Peter Jenni, Daniel Froidevaux, Darien Wood, P. Cenci, G. Fumagalli, Marzio Nessi, J. P. Repellin, A. Cravero, E. E. Kluge, R. Spiwoks, D. Autiero, K. Meier, G. Costa, R. Moning, F. Pastore, T. Pal, N. Kurz, G. Unal, C. Conta, Luca Cozzi, E. Iacopini, B. Esposito, D. Buskulic, Vincenzo Cavasinni, I.A. Bertram, Y. Ducros, P. Lubrano, L. Linssen, Sten Hellman, E. Pennacchio, K. Borer, L. Mandelli, S. Lami, A. Dell'Acqua, Claus Gössling, Cinzia Talamonti, T. O. White, A. R. Weidberg, Kevin Einsweiler, and S. N. Tovey

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Meson, Branching fraction, Hadron, Elementary particle, law.invention, Nuclear physics, Particle decay, Pion, law, Collider
Abstract

Results are given on a search for the decay W±→π±γ with the UA2 detector in pp collisions at √s=630 GeV. No signal for such a process is observed and upper limits on the ration R=Γ(W±→π±γ)/Γ(W±→e±v)

Published
1992
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5. Direct measurement of the W-γ coupling at the CERN p Collider

Author

Francesca Nessi-Tedaldi, I.A. Bertram, P. Lubrano, A. Cravero, Gary F. Egan, E. Iacopini, L. Linssen, Vincenzo Cavasinni, M. Punturo, T. Pal, J. Alitti, B. Schmidt, P. Cenci, Claus Gössling, C. Onions, S. L. Singh, S. A. Wotton, K. Hultqvist, L. DiLella, P. Petroff, M. Bourliand, Karl Jakobs, Peter Jenni, L. Mandelli, P. Bonamy, R. Spiwoks, E. Tsesmelis, T. DelPrete, Michel Lefebvre, Paola Scampoli, Alan Poppleton, Marco Fraternali, Livio Mapelli, G. Unal, M. Curatolo, J-P. Meyer, Chariclia Petridou, H. Plothow-Besch, E. Pennacchio, Marzio Nessi, A. Dell'Acqua, Sten Hellman, B. Esposito, D. Buskulic, F. Costantini, Klaus Peter Pretzl, E. Hugentobler, J. M. Gaillard, V. Simak, J. Schacher, M. Valdata-Nappi, E. E. Kluge, K. Borer, S. Lami, Laura Perini, Roberto Ferrari, O. Gildemeister, Marcello Mazzanti, Andrea Federspiel, N. Kurz, G. Blaylock, J. C. Chollet, Paolo Lariccia, Julius Hrivnac, M. Pepe, S. Grünendahl, Valerio Vercesi, G. Parrour, G. Polesello, D. Cavalli, Adele Rimoldi, F. Gianotti, Y. Ducros, J. P. Repellin, Michael Andrew Parker, M. Primavera, Darien Wood, H. Zaccone, Daniel Froidevaux, A. Zylberstejn, Giovanna Ambrosini, F. Tondini, V. Sondermann, G. Fumagalli, L. Müller, B. Merkel, K. Meier, P. Bareyre, R. Ansari, C. Conta, Massimiliano F. Sacchi, G. Costa, Louis Fayard, M. Morganti, H. Hufnagel, Luca Cozzi, Giovanni Carboni, V. G. Goggi, F. Pastore, J.M. Pentney, K. Hara, Steinar Stapnes, R. S. DeWolf, P. S. Wells, D. J. Munday, D. Autiero, M. Moniez, S. N. Tovey, A. R. Weidberg, Kevin Einsweiler, Cinzia Talamonti, J. Incandela, T. O. White, R. Moning, Michele Livan, and C. Magneville

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Muon, Anomalous magnetic dipole moment, Coupling (probability), Standard Model, law.invention, Nuclear physics, law, Quadrupole, Collider, Magnetic dipole
Abstract

The process pp→evγ+X is studied as √s=630 GeV. The observed signal is used to extract a direct measurement of the parameters κ and λ which define the magnetic dipole and electric quadrupole moments of the W boson and therefore the WWγ coupling. We find κ=1+2.6−2.2 and λ=0+1.7−1.8 and their 95% confidence limits −3.5

Published
1992
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6. A search for scalar leptoquarks at the CERN collider

Author

D. Cavalli, Adele Rimoldi, M. Primavera, A. Zylberstejn, B. Merkel, V. G. Goggi, V. Simak, H. Plothow-Besch, J.M. Pentney, I.A. Bertram, Alan Poppleton, E. E. Kluge, G. Costa, S. Grünendahl, Cinzia Talamonti, Laura Perini, Livio Mapelli, Andrea Federspiel, T. Pal, S. A. Wotton, G. Parrour, K. Hultqvist, K. Hara, Francesca Nessi-Tedaldi, Michael Andrew Parker, Sten Hellman, L. DiLella, E. Iacopini, V. Sondermann, Paolo Lariccia, Claus Gössling, Michele Livan, L. Mandelli, J. Incandela, L. Müller, Darien Wood, Valerio Vercesi, A. Cravero, Louis Fayard, K. Borer, Peter Jenni, J-P. Meyer, Chariclia Petridou, T. O. White, F. Gianotti, J. P. Repellin, P. Lubrano, Steinar Stapnes, Vincenzo Cavasinni, R. S. DeWolf, L. Linssen, Roberto Ferrari, M. Peper, Daniel Froidevaux, D. Autiero, Gary F. Egan, A. R. Weidberg, R. Moning, P. Cenci, Giovanni Carboni, J. C. Chollet, M. Punturo, Marcello Mazzanti, J. Schacher, M. Moniez, H. Hufnagel, D. J. Munday, S. Lami, G. Blaylock, J. Alitti, K. Meier, Kevin Einsweiler, E. Tsesmelis, C. Conta, T. DelPrete, P. Bonamy, E. Hugentobler, C. Magneville, Marzio Nessi, B. Schmidt, M. Valdata-Nappi, R. Spiwoks, Luca Cozzi, F. Tondini, F. Pastore, P. S. Wells, P. Bareyre, S. N. Tovey, H. Zaccone, G. Unal, M. Morganti, B. Esposito, Klaus Peter Pretzl, D. Buskulic, Y. Ducros, Giovanna Ambrosini, N. Kurz, R. Ansari, E. Pennacchio, Massimiliano F. Sacchi, F. Costantini, A. Dell'Acqua, O. Gildemeister, G. Polesello, G. Fumagalli, M. Curatolo, J. M. Gaillard, S. L. Singh, Michel Lefebvre, M. Bourliaud, Paola Scampoli, Marco Fraternali, J. Hřivnáč, C. Onions, P. Petroff, and Karl Jakobs

Subjects
Quark, Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Physics::Instrumentation and Detectors, Branching fraction, High Energy Physics::Phenomenology, Scalar (physics), Electron, Nuclear physics, Pair production, High Energy Physics::Experiment, Leptoquark, Electron neutrino
Abstract

A search has been made for scalar leptoquark pair production with the upgraded UA2 detector at the CERN p p Collider at √s = 630 GeV, investigating decays of the leptoquark into a quark and either an electron or an electron neutrino. From an event sample corresponding to an integrated luminosity of 13 pb−1 a lower limit has been determined for the mass of first generation leptoquarks, yielding 67 GeV (95% CL) for a scalar leptoquark decaying with a 50% branching ratio into a quark and an electron.

Published
1992
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7. A determination of the strong coupling constant αs from W production at the CERN pp̄ collider

Author

T. Pal, H. Zaccone, N. Kurz, E. Iacopini, Vincenzo Cavasinni, J. Alitti, P. Lubrano, B. Meier, Giovanni Carboni, E. Tsesmelis, Claus Gössling, L. Linssen, L. Mandelli, H. Hufnagel, E. Hugentobler, M. Morganti, F. Pastore, Cinzia Talamonti, M. Valdata-Nappi, V. Simak, P. Bareyre, M. Moniez, Michael Andrew Parker, A. V. Stirling, I.A. Bertram, Daniel Froidevaux, E. Pennacchio, Darien Wood, Julius Hrivnac, Valerio Vercesi, C. Onions, T. O. White, F. Gianotti, P. Petroff, Marcello Mazzanti, F. Costantini, Karl Jakobs, P. S. Wells, A. Dell'Acqua, Louis Fayard, G. Blaylock, Michele Livan, C. Conta, Giovanna Ambrosini, T. DelPrete, H. Plothow-Besch, S. Lami, M. Punturo, G. Fumagalli, Alan Poppleton, M. Curatolo, Andrea Federspiel, Luca Cozzi, Livio Mapelli, G. Costa, R. Ansari, J. M. Gaillard, Paolo Lariccia, S. N. Tovey, Y. Ducros, Sten Hellman, Massimiliano F. Sacchi, Steinar Stapnes, J. Schacher, R. S. DeWolf, A. R. Weidberg, G. Parrour, Michel Lefebvre, M. Bourliaud, Paola Scampoli, Francesca Nessi-Tedaldi, M. Bonesini, Kevin Einsweiler, Marzio Nessi, D. J. Munday, Marco Fraternali, M. Pepe, A. Cravero, E. E. Kluge, O. Gildemeister, G. Polesello, P. Bonamy, Laura Perini, F. Tondini, S. L. Singh, D. Autiero, J. P. Repellin, Klaus Peter Pretzl, V. G. Goggi, J.M. Pentney, K. Hara, J. Incandela, C. Magneville, R. Moning, S. Grünendahl, K. Borer, G. Unal, V. Sondermann, L. Müller, B. Esposito, D. Buskulic, J-P. Meyer, Chariclia Petridou, Roberto Ferrari, J. C. Chollet, S. A. Wotton, K. Hultqvist, L. DiLella, Peter Jenni, Gary F. Egan, D. Cavalli, Adele Rimoldi, M. Primavera, A. Zylberstejn, B. Merkel, and P. Cenci

Subjects
Physics, Nuclear and High Energy Physics, Jet (fluid), Particle physics, Large Hadron Collider, Large sample, law.invention, Nuclear physics, law, Strong coupling, High Energy Physics::Experiment, Nuclear Experiment, Collider, Constant (mathematics), Production rate
Abstract

The large sample of W→eν events collected by the UA2 experiment at the CERN pp collider between 1988 and 1990 has been used to determine the strong coupling constant α s . From a measurement of the ratio of the production rate of W events with one jet to that with no jets, α s has been extracted to second order in the MS scheme: α s (M 2 w )=0.123±0.0.18( stat .)±0.017 ( syst .) .

Published
1991
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8. Inclusive jet cross-section and a search for quark compositeness at the CERN Collider

Author

G. Costa, J. M. Pentney, O. Gildemeister, G. Polesello, E. Pennacchio, Roberto Ferrari, Marzio Nessi, Giovanni Carboni, A. Dell'Acqua, M. Morganti, Francesca Nessi-Tedaldi, M. Moniez, Steinar Stapnes, R. S. DeWolf, J. C. Chollet, E. Hugentobler, Louis Fayard, Michel Lefebvre, M. Bourliaud, Paola Scampoli, Marco Fraternali, C. Conta, C. Onions, M. Valdata-Nappi, D. J. Munday, F. Pastore, Laura Perini, P. Petroff, Karl Jakobs, V. G. Goggi, H. Plothow-Besch, J. P. Repellin, Marcello Mazzanti, Valerio Vercesi, Michele Livan, F. Gianotti, G. Unal, A. R. Weidberg, E. Iacopini, G. Blaylock, M. Pepe, Joe Incandela, Andrea Federspiel, P. Bonamy, Paolo Lariccia, P. S. Wells, Alan Poppleton, N. Kurz, D. Buskulic, T. DelPrete, J. Schacher, D. Autiero, Vincenzo Cavasinni, Livio Mapelli, S. L. Singh, S.N. Tovey, R. Ansari, Claus Gössling, E. E. Kluge, M. Punturo, C. Magneville, S. Lami, A. V. Stirling, S. A. Wotton, K. Hultqvist, L. DiLella, P. Lubrano, J. Alitti, Kevin Einsweiler, F. Tondini, H. Zaccone, L. Linssen, M. Bonesini, P. Bareyre, Peter Jenni, Klaus Peter Pretzl, K. Meier, F. Costantini, K. Hara, J. M. Gaillard, T. Pal, L. Rasmussen, M. A. Parker, D. Cavalli, Adele Rimoldi, M. Primavera, Darien Wood, R. Moning, T. O. White, J-P. Meyer, Chariclia Petridou, B. Merkel, Gary F. Egan, P. Cenci, G. Fumaglli, S. Grünendahl, K. Borer, L. Mandelli, L. Müller, E. Tsesmelis, Sten Hellman, G. Parrour, and D. Froidevaux

Subjects
Physics, Quark, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Astrophysics::High Energy Astrophysical Phenomena, Hadron, Elementary particle, Jet (particle physics), law.invention, Nuclear physics, law, Pseudorapidity, High Energy Physics::Experiment, Nuclear Experiment, Collider
Abstract

The inclusive jet cross-section has been measured at the CERN p p Collider ( s = 630 GeV ) as a function of the jet transverse momentum (pT) and pseudorapidity (η) for pT values up to 180 GeV and for−2 825 GeV (95% CL) is set on the quark compositeness scale Λc.

Published
1991
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9. A precise determination of the W and Z masses at the CERN p collider

Author

Steinar Stapnes, D. Cavalli, J. M. Gaillard, D. J. Munday, H. Plothow-Besch, Andrea Federspiel, Paolo Lariccia, P. Bareyre, C. Onions, P. Petroff, Karl Jakobs, Claus Gössling, M. Bonesini, K. Meier, J. G. Rushbrooke, Michele Livan, G. Blaylock, S. L. Singh, P. Bonamy, M. Moniez, K. Hultqvist, S. Lami, Roberto Ferrari, J. C. Chollet, M. Morganti, P. S. Wells, S. Grünendahl, M. Pepe, C. Magneville, Michel Lefebvre, Paola Scampoli, G. Parrour, B. De Lotto, E. Hugentobler, M. Valdata-Nappi, J. Schacher, Marco Fraternali, L. Linssen, Marcello Mazzanti, Louis Fayard, D. R. Wood, C. N. Booth, P. Cenci, L. Müller, Gary F. Egan, P. Lubrano, E. E. Kluge, Laura Perini, J.D. Hansen, F. Costantini, L. Rasmussen, J. P. Repellin, R. Moning, J-P. Meyer, Chariclia Petridou, L. Mandelli, H. Zaccone, Alan Poppleton, L. Di Lella, Richard E. Ansorge, T. Pal, V. Cavasinni, F. Pastore, Livio Mapelli, S. A. Wotton, S. N. Tovey, R. Ansari, V. G. Goggi, Peter Jenni, G. Carboni, Sten Hellman, N. Kurz, T. O. White, K. Borer, R. S. De Wolf, G. Unal, T. Del Prete, D. Buskulic, A. R. Weidberg, Allan G Clark, K. Hara, Kevin Einsweiler, C. Conta, D. Froidevaux, Joe Incandela, G. Fumagalli, J. M. Pentney, Valerio Vercesi, F. Gianotti, J. Crittenden, E. Iacopini, Paolo Bagnaia, J. Alitti, G. Costa, O. Gildemeister, G. Polesello, M. A. Parker, Adele Rimoldi, M. Primavera, A. V. Stirling, B. Merkel, E. Pennacchio, A. Dell'Acqua, and D. Autiero

Subjects
Systematic error, Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Weinberg angle, Mass ratio, law.invention, Nuclear physics, Absolute measurement, law, W and Z bosons, High Energy Physics::Experiment, Nuclear Experiment, Collider
Abstract

The UA2 experiment has collected large samples of W and Z events during recent runs at the CERN p p Collider at s = 630 GeV . These samples have been used to perform precise measurements of the masses of the W and Z bosons. After a careful analysis of systematic errors, an improved result is obtained for the mass ratio mwmz. This provides a new value for the weak mixing parameter sin2θw. Furthermore, it can be combined with recent measurements of the Z mass from e+e− colliders to give an absolute measurement of the W mass, leading to the result mw=80.49±0.43 (stat) ± 0.24 (syst) GeV.

Published
1990
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10. Experimental study of the emergence of two-jet dominance in p collisions at √s = 630 GeV

Author

Eric Lancon, R. Mollerud, T. Himel, Louis Fayard, E. E. Kluge, C. Onions, R. Engelmann, B. Hahn, D. Froidevaux, S. Loucatos, B. De Lotto, J. Schacher, M. Morganti, M. Borghini, H. Zaccone, H. Hänni, P. Cenci, Giancarlo Mantovani, K. Bernlöhr, Bruno Mansoulie, J. Dines-Hansen, K. Borer, O. Kofoed-Hansen, J.-C. Chollet, V. Ruhlmann, M. A. Parker, B. Madsen, M. Banner, Adele Rimoldi, L. Di Lella, M. Valdata-Nappi, F. Stocker, John H. L. Hansen, J.P. Repellin, Melody A. Swartz, P. Darriulat, A. R. Weidberg, Marco Fraternali, O. Gildemeister, Michele Livan, G. Carboni, A. F. Rothenberg, Peter Hansen, Lydia Iconomidou-Fayard, C. Conta, S.N. Tovey, J.-M. Gaillard, V. Cavasinni, A. Roussarie, B. Merkel, Kevin Einsweiler, R. Battiston, G. Parrour, Allan G Clark, T. del Prete, P. Mani, M. Pepe, V. G. Goggi, H. Plothow-Besch, M. Moniez, W.Y. Tsang, F. Pastore, M. Wunsch, Paolo Bagnaia, G. Sauvage, Valerio Vercesi, J. A. Appel, M. Polverel, K. Meier, N. Harnew, R. Moning, Peter Jenni, Claus Gössling, M. Schlötelburg, J. Teiger, and Livio Mapelli

Subjects
Physics, Rest (physics), Nuclear and High Energy Physics, SIMPLE (dark matter experiment), Particle physics, Jet (particle physics), law.invention, Nuclear physics, Transverse plane, Dominance (ethology), law, Collider, Event (particle physics), Energy (signal processing)
Abstract

A heuristic model is used to describe data collected by the UA2 experiment at √ s = 630 GeV . Distributions of the energy sharing between the leading clusters and the rest of the event are examined. The main features of these distributions can be described by a two-component model with soft, collective interactions dominating at low transverse energy and hard, constituent interactions dominating at high transverse energy. This model provides a simple picture of the emergence of two-jet dominance at SPS p p Collider energies.

Published
1985
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11. Measurement of the dependence of jet production at the CERN p collider

Author

Claus Gössling, M. Borghini, M. Morganti, Eric Lancon, H. Hänni, M. Wunsch, M. Polverel, N. Harnew, Livio Mapelli, A. Putzer, F. Stocker, P. Darriulat, Allan G Clark, P. Mani, R. Moning, A. F. Rothenberg, A. Roussarie, B. De Lotto, K. Borer, V. Ruhlmann, Roberto Battiston, Vincenzo Cavasinni, H. Zaccone, Michele Livan, Paolo Bagnaia, E. E. Kluge, J. Dines-Hansen, Melody A. Swartz, M. Schlötelburg, V. G. Goggi, Peter Jenni, J. Teiger, G. Sauvage, J.-M. Gaillard, B. Hahn, D. Froidevaux, Bruno Mansoulie, O. Kofoed-Hansen, J. A. Appel, W.Y. Tsang, C. Onions, H. Plothow-Besch, B. Merkel, K. Meier, Lydia Iconomidou-Fayard, L. Di Lella, G. Parrour, K. Tittel, A. Codino, John H. L. Hansen, P. Cenci, M. Valdata-Nappi, M. Moniez, C. Conta, Giovanni Carboni, S. Loucatos, J.P. Repellin, F. Pastore, J.-C. Chollet, L. Rasmussen, Marco Fraternali, Giancarlo Mantovani, Peter Hansen, Adele Rimoldi, R. Engelmann, J. Schacher, K. Bernlöhr, Valerio Vercesi, M. Banner, T. Himel, T. Del Prete, O. Gildemeister, M. Pepe, R. Mollerud, A. R. Weidberg, Louis Fayard, S.N. Tovey, Kevin Einsweiler, and B. Madsen

Subjects
Quark, Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Hadron, Jet (particle physics), law.invention, Nuclear physics, law, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, Collider, Scaling
Abstract

The production of very large transverse momentum ( p T ) hadron jets has been measured in the UA2 experiment at the CERN p p Collider for s =630 GeV . The inclusive jet production cross sections exhibit a p T -dependent increase with respect to the s =546 GeV data from previous Collider runs. This increase can be described both by QCD calculations and by approximate x T =2 p T /√ s scaling. No significant deviation of the data from QCD predictions is observed at very large p T , placing a lower limit on the characteristic scale Λ c of a hypothetical superstrong contact interaction responsible for the binding of preons in the quark ( Λ c >370 GeV at 95% CL).

Published
1985
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12. Direct photon production at the CERN p̄p collider

Author

P. Cenci, Eric Lancon, Marco Fraternali, Peter Hansen, G. Sauvage, A. R. Weidberg, M. Banner, H. Zaccone, C. Onions, S.N. Tovey, J. A. Appel, N. Harnew, Livio Mapelli, R. Mollerud, K. Meier, Kevin Einsweiler, M. Borghini, E. E. Kluge, Louis Fayard, J. C. Chollet, John H. L. Hansen, C. Conta, T. Himel, B. Hahn, M. Morganti, Allan G Clark, P. Mani, G. Parrour, Claus Gössling, B. Merkel, Roberto Battiston, M. Pepe, M. Schlötelburg, J. Teiger, M. Wunsch, Lydia Iconomidou-Fayard, V. G. Goggi, Melody A. Swartz, S. Loucatos, Giovanni Carboni, M. Valdata-Nappi, W.Y. Tsang, B. De Lotto, M. Polverel, Giancarlo Mantovani, T. Del Prete, R. Moning, M. A. Parker, M. Moniez, L. DiLella, Vincenzo Cavasinni, Bruno Mansoulie, Paolo Bagnaia, P. Darriulat, O. Kofoedo. Kofoed-Hansen, F. Pastore, Michele Livan, H. Hänni, Valerio Vercesi, K. Jacobs, R. Engelmann, Peter Jenni, J. Schacher, F. Stocker, D. Froidevaux, K. Borer, V. Ruhlmann, A. F. Rothenberg, A. Roussarie, K. Bernlöhr, J. P. Repellin, B. Madsen, O. Gildemeister, J. M. Gaillard, H. Plothow-Besch, and J. Dines-Hansen

Subjects
Nuclear physics, Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Cross section (physics), Particle physics, Photon, Large Hadron Collider, law, High Energy Physics::Experiment, Nuclear Experiment, Collider, law.invention
Abstract

Using the UA2 apparatus, the inclusive cross section has been measured for production of high- p T direct photons in pp collisions at s =546 GeV and s =630 GeV . The results are in good agreement with QCD predictions.

Published
1986
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13. SEARCH FOR EXOTIC PROCESSES AT THE CERN PPBAR COLLIDER

Author

G. Sauvage, Roberto Ferrari, Marco Fraternali, J. C. Chollet, B. Hahn, Chariclia Petridou, M. Morganti, G. Parrour, P. Lariccia, Allan G Clark, Steinar Stapnes, B. De Lotto, B. Madsen, Peter Jenni, P. Bagnala, J. M. Gaillard, H. Plothow-Besch, B. Merkel, O. Gildemeister, V. G. Goggi, R. Moning, M. Wunsch, E. Iacopini, Bruno Mansoulie, M. Banner, M. Moniez, P. Darriulat, E. Hugentobler, Vincenzo Cavasinni, P. Cenci, O. Kofoed-Hansen, W.Y. Tsang, Roberto Battiston, Michele Livan, M. Valdata-Nappi, K. Hara, S. Loucatos, H. Hänni, M. Polverel, Melody A. Swartz, F. Stocker, John H. L. Hansen, N. Harnew, C. Conta, Livio Mapelli, Lydia Iconomidou-Fayard, Giancarlo Mantovani, J. Schacher, H. Zaccone, J. Dines-Hansen, K. Borer, V. Ruhlmann, D. Froidevaux, Valerio Vercesi, M. A. Parker, A. Roussarie, Eric Lancon, M. Borghini, E. E. Kluge, K. Bernlöhr, F. Costantini, M. Pepe, L. Di Lella, R. Ansari, R. Mollerud, K. Jacobs, C. N. Booth, Claus Gössling, J. P. Repellin, J. Teiger, K. Meier, T. Pal, Giovanni Carboni, Louis Fayard, T. Del Prete, F. Pastore, P. H. Hansen, C. Onions, A. R. Weidberg, Kevin Einsweiler, and L. Rasmussen

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Luminosity (scattering theory), law, Excited state, High Energy Physics::Experiment, Neutral vector, Collider, law.invention, Boson
Abstract

The total UA2 data sample at the CERN pp Collider corresponds to an integrated luminosity of 910 nb −1 . Limits on various hypothetical processes, such as production of excited electrons, additional charged or neutral vector bosons, or supersymmetric particles, are presented from the analysis of this sample.

Published
1987

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