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31 results on '"J.-C. Chollet"'

1. 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

2. 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

3. 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

4. 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

5. 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

6. A measurement of two-jet decays of theW andZ bosons at the CERN $$\bar p$$ p collider

Author

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

Subjects
Physics, Particle physics, Large Hadron Collider, Physics and Astronomy (miscellaneous), Hadron, Elementary particle, Jet (particle physics), law.invention, Calorimeter, Nuclear physics, law, Mass spectrum, High Energy Physics::Experiment, Collider, Engineering (miscellaneous), Boson
Abstract

A study of the two-jet mass spectrum measured with the UA 2 calorimeter has revealed a signal from hadronic decays ofW andZ bosons above a large background. Production and decay properties of the signal have been measured. The combined production cross-section σ·B(W, Z → two jets) is 9.6±2.3 (stat.)±1.1 (syst.) nb, compared with an expectation of 5.8 nb calculated to order αs2. A limit on the production cross-section of additional heavy vector bosons decaying into two jets is given as a function of the boson mass.

Published
1991

7. 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

8. Measurement of the transverse momentum distributions ofW andZ bosons at the CERN $$\bar pp$$ collider

Author

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

Subjects
Physics, Quantum chromodynamics, Particle physics, Large Hadron Collider, Physics and Astronomy (miscellaneous), High Energy Physics::Phenomenology, law.invention, Nuclear physics, law, Transverse momentum, High Energy Physics::Experiment, Nuclear Experiment, Collider, Engineering (miscellaneous), Particle Physics - Experiment, Boson, Bar (unit)
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)%.

Published
1990

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

10. Measurement ofW andZ production cross sections at the CERN $$\bar p$$ p collider

Author

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

Subjects
Physics, Particle physics, Large Hadron Collider, Physics and Astronomy (miscellaneous), law.invention, Standard Model, Large sample, Nuclear physics, law, Production (computer science), Collider, Engineering (miscellaneous), Bar (unit), Boson
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.

Published
1990

11. A Measurement of Single and Double Prompt Photon Production At the Cern P(bar)p Collider

Author

L. Mandelli, T. DelPrete, J-P. Meyer, Chariclia Petridou, A. R. Weidberg, J. Hřivnáč, Kevin Einsweiler, Giovanna Ambrosini, Y. Ducros, Marcello Mazzanti, H. Zaccone, Gary F. Egan, F. Tondini, C. Onions, P. Petroff, Karl Jakobs, J.-M. Gaillard, Francesca Nessi-Tedaldi, G. Blaylock, S. N. Tovey, Giovanni Carboni, A. Cravero, P. Bareyre, P. Cenci, Roberto Ferrari, I.A. Bertram, V. Simak, O. Gildemeister, Claus Gössling, J. C. Chollet, G. Parrour, F. Pastore, S. L. Singh, Cinzia Talamonti, Valerio Vercesi, F. Gianotti, D. Cavalli, Adele Rimoldi, R. Ansari, P. Lubrano, Sten Hellman, L. Linssen, M. Primavera, Steinar Stapnes, R. S. DeWolf, L. Malgeri, T. Pal, E. Pennacchio, S. Grünendahl, F. Costa, Massimiliano F. Sacchi, A. Zylberstejn, P. Bonamy, G. Polesello, T. O. White, K. Borer, N. Kurz, Andrea Dell'Acqua, B. Merkel, D. J. Munday, S. Lami, V. Sondermann, P. S. Wells, G. Fumagalli, R. Spiwoks, L. Müller, H. Plothow-Besch, Laura Perini, Klaus Peter Pretzl, M. Pepe, G. Unal, Andrea Federspiel, B. Schmidt, Michel Lefebvre, M. Bourliaud, Paola Scampoli, J. P. Repellin, Paolo Lariccia, Marco Fraternali, Marzio Nessi, H. Hufnagel, B. Esposito, E. E. Kluge, D. Buskulic, Louis Fayard, F. Costantini, S. A. Wotton, K. Hultqvist, M. Curatolo, L. DiLella, Peter Jenni, Alan Poppleton, J. Schacher, Livio Mapelli, Michael Andrew Parker, Darien Wood, M. Morganti, V. G. Goggi, J. Incandela, J.M. Pentney, R. Moning, M. Moniez, K. Hara, C. Conta, Luca Cozzi, D. Autiero, Daniel Froidevaux, K. Meier, E. Tsesmelis, E. Hugentobler, E. Iacopini, M. Valdata-Nappi, Vincenzo Cavasinni, M. Punturo, Michele Livan, J. Alitti, C. Magneville, 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., Malgeri, 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, Particle physics, Photon, Luminosity (scattering theory), Large Hadron Collider, Astrophysics::High Energy Astrophysical Phenomena, TRANSVERSE-MOMENTUM, Perturbative QCD, QCD, Standard deviation, lcsh:QC1-999, law.invention, Nuclear physics, PBARP COLLIDER, law, UA2 EXPERIMENT, High Energy Physics::Experiment, Production (computer science), Collider, SCINTILLATING FIBER DETECTOR, lcsh:Physics, Bar (unit)
Abstract

A measurement of the cross-sections for single and double prompt photon production in p p interactions at s = 630 GeV is presented. The data sample corresponds to an integrated luminosity of 13.2 pb−1. The results are in good agreement with the predictions of perturbative QCD. The signal from double prompt photon production has a statistical significance of 4.3 standard deviations.

Published
1992

12. An Improved Determination of the Ratio of W and Z Masses At the Cern Pbarp Collider

Author

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

The W and Z bosons masses, m(W) and m(Z), are measured using samples of W --> ev and Z --> e+e- decays observed in ppBAR collisions at square-root s = 630 GeV. The ratio is found to be m(W)/m(Z) = 0.8813 +/- 0.0036 +/- 0.0019. This gives a value sin2 theta(w) = 0.2234 +/- 0.0064 +/- 0.0033, and in combination with precise m(Z) measurements from LEP yields m(W) = 80.35 +/- 0.33 +/- 0.17 GeV. This result is in good agreement with other experiments, and with the standard model for a top quark mass lighter than 250 GeV.

Published
1992

13. A SEARCH FOR SQUARK AND GLUINO PRODUCTION AT THE CERN PBARP COLLIDER

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Gluino, Large Hadron Collider, Luminosity (scattering theory), Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, Supersymmetry, law.invention, Nuclear physics, law, Transverse momentum, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, Collider, Photino
Abstract

A search has been made with the upgraded UA2 experiment at the CERN p p Collider at s =630 GeV for multi-jet events with large transverse momentum imbalance in a data sample corresponding to an integrated luminosity of 7.4 pb−1. Under the assumption that the photino is the lightest stable supersymmetric (SUSY) particle, the data have been used to deduce lower limits in a minimal SUSY model for the squark ( m q ) and the gluino ( m g ) masses. The 90% CL bounds are m g > 74 GeV independent of m g , m g > 79 GeV independent of m g , and and m> 106 GeV for m q =m q =m .

Published
1990

14. A study of multi-jet events at the CERN p̄p collider and a search for double parton scattering

Author

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

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Physics::Instrumentation and Detectors, Scattering, Hadron, Parton, Elementary particle, Jet (particle physics), law.invention, Nuclear physics, law, High Energy Physics::Experiment, Collider, Nuclear Experiment
Abstract

A study of events containing at least four high transverse momentum jets and a search for double parton scattering (DPS) have been performed using data collected with the UA2 detector at the CERN p̄p Collider (√s=630 GeV). The results are in good agreement with leading order QCD calculations. A value of σDPS

Published
1991

15. Inclusive charged particle production at the CERN p collider

Author

K. Borer, Marco Fraternali, O. Gildemeister, W. Zeller, H. Hänni, P. Darriulat, C. Onions, N. Prevot, Fr. Pastore, V. G. Goggi, P. A. Dorsaz, Valerio Vercesi, Michele Livan, J. Schacher, F. Bonaudi, J. Dines-Hansen, Allan G Clark, M. Mermikides, V. Hungerbühler, G. Sauvage, D. Froideveaux, J. M. Gaillard, R. Mollerud, Louis Fayard, F. Stocker, H. Plothow-Besch, A. F. Rothenberg, A. Roussarie, T. Himel, M. Borghini, John H. L. Hansen, C. Conta, H. Grote, J. C. Chollet, B. Madsen, G. Parrour, P. H. Hansen, G.C. Mantovani, B. Hahn, J. P. Repellin, L. DiLella, M. Banner, B. Merkel, Peter Jenni, S. Loucatos, Ph. Bloch, H. Zaccone, B.S. Nilsson, O. Kofoed-Hansen, A. Zylberstejn, Bruno Mansoulie, Livio Mapelli, J. L. Siegrist, and J. Teiger

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Physics::Instrumentation and Detectors, Nuclear Theory, Detector, Charged particle, law.invention, Momentum, Nuclear physics, Transverse plane, Pion, law, Transverse momentum, High Energy Physics::Experiment, Nuclear Experiment, Collider
Abstract

Transverse momentum distributions of pions, kaons and protons have been measured around 90° in the UA2 detector at the SPS p p collider, at a CM energy of 540 GeV. All the cross sections have increased by more than a factor of 2 over those measured at ISR energies and exhibit a flatter behaviour with respect to transverse momentum.

Published
1983

16. 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

17. A study of high transverse momentum electrons produced in $$\bar pp$$ collisions at 540 GeV

Author

G. Stimpfl, Allan G Clark, P. Mani, M. Borghini, Roberto Battiston, R. Engelmann, Melody A. Swartz, F. Bonaudi, B. Merkel, Michele Livan, Marco Fraternali, J. Schacher, T. Himel, M. Polverel, H. Plothow-Besch, V. G. Goggi, J. A. Zakrzewski, P. A. Dorsaz, C. Onions, D. Froidevaux, W. Zeller, Peter Hansen, Valerio Vercesi, J. Dines-Hansch, Paolo Bagnaia, V. Hungerbühler, B. Madsen, J. P. Repellin, F. Stocker, Eric Lancon, A. F. Rothenberg, John H. L. Hansen, A. Roussarie, C. Conta, W. R. Weidberg, K. Borer, J. M. Gaillard, Peter Jenni, L. Di Lella, P. Darriulat, O. Kofoed-Hansen, F. Pastore, G. Fumagalli, B. Hahn, S. Loucatos, Ph. Bloch, Giancarlo Mantovani, O. Gildemeister, G. Sauvage, H. Hänni, Bruno Mansoulie, S.N. Tovey, H. Zaccone, Adele Rimoldi, B.S. Nilsson, G. Parrour, N. Harnew, J. L. Siegrist, Livio Mapelli, M. Banner, J. Bürger, J. C. Chollet, P. Cenci, J. Teiger, Claus Gössling, R. Mollerud, and Louis Fayard

Subjects
Physics, Particle physics, Large Hadron Collider, Physics and Astronomy (miscellaneous), Weinberg angle, Elementary particle, Electron, law.invention, Standard Model, Particle acceleration, Nuclear physics, law, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, Collider, Engineering (miscellaneous), Particle Physics - Experiment
Abstract

The production of electrons with very high transverse momentum has been studied in the UA2 experiment at the CERN {Mathematical expression} collider ( {Mathematical expression}=540 GeV). From a sample of events containing an electron candidate with pT>15 GeV/c, we extract a clear signal resulting from the production of the charged intermediate vector boson W±, which subsequently decays into an electron and a neutrino. We study the W production and decay properties. Further-more, we refine our results on the production and decay of the neutral vector boson Z0. Finally, we compare the experimental results to the predictions of the standard model of the unified electro-weak theory. © 1984 Springer-Verlag.

Published
1984

18. A new search for relativistic particles with fractional electric charge at the CERN collider

Author

P. A. Dorsaz, Peter Jenni, H. Hänni, Valerio Vercesi, J. M. Gaillard, Daniel Froidevaux, G. Parrour, J. P. Repellin, H. Plothow-Besch, F. Stocker, G. Sauvage, T. Himel, Allan G Clark, P. Mani, J. C. Chollet, Fr. Pastore, A. F. Rothenberg, S. Loucatos, M. Borghini, M. Banner, O. Gildemeister, Marco Fraternali, Michele Livan, R. Mollerud, V.G. Goggi, W. Zeller, B. Madsen, Louis Fayard, C. Onions, John H. L. Hansen, H. Zaccone, C. Conta, K. Borer, B. Hahn, P. H. Hansen, P. Darriulat, J. Teiger, L. Di Lella, Livio Mapelli, J. Schacher, J. Dines-Hansen, A. Roussarie, J. L. Siegrist, B. Merkel, O. Kofoed-Hansen, Ph. Bloch, Giancarlo Mantovani, and B. Mansoulié

Subjects
Physics, Quark, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Charge (physics), Electric charge, Charged particle, law.invention, Relativistic particle, Nuclear physics, law, Ionization, Collider
Abstract

We report on a search for relativistic particles with fractional electric charge at the CERN p p colider, using a telescope of scintillation counters to detect particles with anomalously low ionization. Since no event survives the selection criteria, upper limits on quark production are deduced from this experiment. At 90% confidence level and in the limit of very light quarks with charge ± 1 2 and ± 2 3 they are 2.8×10 −6 and 5.6×10 −5 , respectively, per single charged particle. These limits increase rapidly with increasing quark mass and are nearly two and one order of magnitude better than previously measured by UA2.

Published
1985

19. 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

20. 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

21. Measurement ofW ± andZ 0 properties at the CERN $$\bar pp$$ p collider

Author

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

Subjects
Physics, Quantum chromodynamics, Particle physics, Luminosity (scattering theory), Large Hadron Collider, Physics and Astronomy (miscellaneous), Electroweak interaction, Weinberg angle, Elementary particle, law.invention, Standard Model, Nuclear physics, law, High Energy Physics::Experiment, Nuclear Experiment, Collider, Engineering (miscellaneous)
Abstract

A study ofW± andZ0 properties has been performed using the UA2 detector at the\(\bar pp\) collider. The data correspond to a total integrated luminosity of 142 nb−1 at\(\sqrt s \)=546 GeV, and of 310 nb−1 at\(\sqrt s \)=630 GeV. The experimental results are compared with the predictions of the Standard Model of the unified electroweak theory.

Published
1986

22. A study of three-jet events at the CERN $$\bar pp$$ collider

Author

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

Subjects
Quantum chromodynamics, Physics, Particle physics, Large Hadron Collider, Physics and Astronomy (miscellaneous), Bar (music), Bremsstrahlung, Jet (particle physics), Measure (mathematics), law.invention, Gluon, Nuclear physics, law, High Energy Physics::Experiment, Collider, Engineering (miscellaneous)
Abstract

The UA2 experiment, running at the CERN SPS\(\bar pp\) Collider, has performed a study of events containing three hard jets in the final state. The angular distributions of the three jets show evidence for gluon bremsstrahlung, in good agreement with a QCD model to leading order in the strong coupling constant αs. The yield of three-jet events relative to that of two-jet events provides a measure of the strong coupling constant: ;3K3/K2=0.23±0.01±0.04, whereK2 andK3 represent the contributions arising from higher order corrections in α3 to the two- and three-jet exclusive cross-sections. A detailed discussion of the systematic and theoretical uncertainties is given.

Published
1986

23. Inclusive particle production in the transverse momentum range between 0.25 and 40 GeV/c at the CERN Sp$\overline{p}$S collider

Author

Eric Lancon, V. Hungerbühler, F. Bonaudi, J. Dines Hansen, K. Borer, B. Madsen, H. Plothow-Besch, C. Onions, D. Froidevaux, Peter Jenni, P. A. Dorsaz, B. Hahn, Michele Livan, Marco Fraternali, J. C. Chollet, W. Zeller, Peter Hansen, L. Di Lella, Valerio Vercesi, Livio Mapelli, J. M. Gaillard, H. Hänni, Allan G Clark, V. G. Goggi, P. Mani, H. Zaccone, F. Stocker, A. F. Rothenberg, M. Banner, Bruno Mansoulie, J. Schacher, J. Teiger, F. Pastore, O. Gildemeister, O. Kofoed-Hansen, J. L. Siegrist, T. Himel, A. Roussarie, S. Loucatos, Ph. Bloch, Giancarlo Mantovani, John H. L. Hansen, Adele Rimoldi, C. Conta, B. Merkel, R. Mollerud, Louis Fayard, A. R. Weidberg, G. Sauvage, M. Polverel, G. Parrour, P. Darriulat, M. Borghini, and J. P. Repellin

Subjects
Physics, Particle physics, Large Hadron Collider, Physics and Astronomy (miscellaneous), Meson, Branching fraction, Hadron, Elementary particle, Charged particle, law.invention, Nuclear physics, Pion, law, High Energy Physics::Experiment, Nuclear Experiment, Collider, Engineering (miscellaneous), Particle Physics - Experiment
Abstract

Inclusive particle production cross-sections have been measured at the $$Sp\bar pS$$ collider using the UA2 detector in various ranges of transverse momentum (P T ) and pseudo-rapidity (η). Cross-section measurements are presented forπ 0 production (P T ≦15 GeV/c, |η|≦0.85 andP T ≦40 GeV/c, 1.0≦|η|≦1.8), for η meson production (3≦P T ≦6 GeV/c, |η|≦0.85) and for charged particle production (P T ≦10 GeV/c, 1.0≦|η|≦1.8). Results are compared with the predictions of QCD calculations.

Published
1985

24. Measurement of the standard model parameters from a study of W and Z bosons

Author

Giovanni Carboni, P. Lariccia, B. Lisowski, John H. L. Hansen, Lydia Iconomidou-Fayard, C. Conta, F. Pastore, J. M. Gaillard, H. Plothow-Besch, Allan G Clark, A. Roussarie, V. G. Goggi, Valerio Vercesi, K. Borer, P. H. Hansen, W.Y. Tsang, V. Ruhlmann, M. Moniez, K. Hara, Marco Fraternali, C. Onions, F. Stocker, M. Morganti, P. Darriulat, J. Dines-Hansen, G. Sauvage, T. Del Prete, Roberto Battiston, H. Zaccone, E. Iacopini, B. Hahn, J. Teiger, Chariclia Petridou, B. Madsen, G. Parrour, T. Pal, Vincenzo Cavasinni, Paolo Bagnaia, Melody A. Swartz, N. Harnew, Livio Mapelli, D. Froidevaux, B. De Lotto, L. Rasmussen, Claus Gössling, F. Costantini, E. E. Kluge, L. Di Lella, Michele Livan, O. Gildemeister, R. Moning, H. Hänni, Bruno Mansoulie, B. Merkel, M. Banner, P. Cenci, O. Kofoed-Hansen, A. R. Weidberg, S. Loucatos, R. Mollerud, S.N. Tovey, Louis Fayard, Kevin Einsweiler, Peter Jenni, Giancarlo Mantovani, M. A. Parker, M. Pepe, Roberto Ferrari, J. C. Chollet, Eric Lancon, M. Wunsch, K. Jakobs, M. Polverel, J. A. Zakrzewski, C. N. Booth, J. P. Repellin, M. Borghini, R. Ansari, J. Schacher, K. Bernlöhr, E. Hugentobler, M. Valdata-Nappi, K. Meier, Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and UA2

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Luminosity (scattering theory), 010308 nuclear & particles physics, Electroweak interaction, Weinberg angle, 7. Clean energy, 01 natural sciences, law.invention, Standard Model, Nuclear physics, law, 0103 physical sciences, W′ and Z′ bosons, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Neutrino, Nuclear Experiment, 010306 general physics, Collider, Particle Physics - Experiment
Abstract

A study has been made of the decays W → ev and Z → e + e − , using the UA2 detector at the CERN pp Collider. The data correspond to an integrated luminosity of 142 nb −1 at a centre-of-mass collision energy √ s =546 GeV, and 768 nb −1 at √ s =630 GeV. Measurements of the standard model parameters from samples of 251 W decay and 39 Z decay candidates are compared with expectations of the standard electroweak model.

Published
1987

25. EVIDENCE FOR Z0-]E+E- AT THE CERN P-P COLLIDER

Author

H. Zaccone, F. Bonaudi, B.S. Nilsson, G. Sauvage, O. Kofoed-Hansen, B. Merkel, F. Stocker, A. F. Rothenberg, J. C. Chollet, B. Madsen, J. Dines-Hansen, A. R. Weidberg, G. Stimpfl, P. A. Dorsaz, J. M. Gaillard, H. Plothow-Besch, Valerio Vercesi, V. Hungerbühler, Michele Livan, Marco Fraternali, W. Zeller, T. Himel, G. Fumagalli, J. Schacher, B. Hahn, Allan G Clark, P. Mani, Livio Mapelli, S. Loucatos, H.M. Steiner, Ph. Bloch, Giancarlo Mantovani, Adele Rimoldi, O. Gildemeister, Peter Jenni, Eric Lancon, L. Di Lella, K. Borer, J. Teiger, P. Darriulat, G. Parrour, H. Hänni, Paolo Bagnaia, C. Onions, Bruno Mansoulie, M. Borghini, J. L. Siegrist, A. Roussarie, Roberto Battiston, H. Grote, M. Mermikides, M. Banner, M. Polverel, J. A. Zakrzewski, J. P. Repellin, R. Mollerud, Louis Fayard, Daniel Froidevaux, V. G. Goggi, John H. L. Hansen, C. Conta, P. H. Hansen, and F. Pastore

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Electron pair, Large Hadron Collider, Electroweak interaction, Weinberg angle, Electron, law.invention, Vector boson, Nuclear physics, law, High Energy Physics::Experiment, Collider, Boson
Abstract

From a search for electron pairs produced in p p collisions at s = 550 GeV we report the observation of eight events which we interpret as resulting from the process p +p→Z 0 + anything, followed by the decay Z0→e++e− or Z0→e++e−+γ, where Z0 is the neutral Intermediate Vector Boson postulated by the unified electroweak theory. We use four of these events to measure the Z0 mass M Z = 91.9 ± 1.3 ± 1.4 (systematic) GeV /c 2 .

Published
1983

26. MEASUREMENT OF VERY LARGE TRANSVERSE-MOMENTUM JET PRODUCTION AT THE CERN P-BAR-P COLLIDER

Author

F. Stocker, L. Di Lella, A. Roussarie, A. F. Rothenberg, O. Kofoed-Hansen, G. Stimpfl, Claus Gössling, Eric Lancon, M. Borghini, Livio Mapelli, S. Loucatos, Michele Livan, H. Plothow-Besch, Marco Fraternali, C. Onions, D. Froidevaux, G. Sauvage, B. Hahn, W. Zeller, Peter Hansen, R. Engelmann, Ph. Bloch, A. R. Weidberg, Giancarlo Mantovani, J. A. Zakrzewski, Bruno Mansoulie, B. Madsen, J. Teiger, H. Zaccone, J. C. Chollet, J. Dines-Hansen, Allan G Clark, P. Mani, O. Gildemeister, M. J. Shochet, Adele Rimoldi, M. Banner, John H. L. Hansen, G. Parrour, J. L. Siegrist, J. Schcher, Roberto Battiston, J. P. Repellin, C. Conta, H. Hänni, Melody A. Swartz, M. Polverel, R. Mollerud, K. Borer, B. Merkel, F. Pastore, P. Darriulat, Louis Fayard, Valerio Vercesi, V. G. Goggi, J. Bürger, J. M. Gaillard, Peter Jenni, Paolo Bagnaia, and T. Himel

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, Large Hadron Collider, Calorimeter (particle physics), Astrophysics::High Energy Astrophysical Phenomena, Hadron, Jet (particle physics), law.invention, Nuclear physics, law, High Energy Physics::Experiment, Invariant mass, Nuclear Experiment, Collider
Abstract

The production of very large transverse momentum hadron jets has been measured in the UA2 experiment at the CERN p p Collider for s = 540 GeV using a highly segmented calorimeter. The range of previously available cross sections for inclusive jet production is extended to pT = 150 GeV and the two-jet invariant mass distribution to mjj = 280 GeV with the largely increased data sample collected during the 1983 running period. The results are compared with the predictions of QCD models.

Published
1984

27. 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

28. Measurement of W and Z Production Properties at the CERN anti-p p Collider

Author

R. Ansari, P. Bagnaia, M. Banner, R. Battiston, K. Bernlöhr, C. Booth, K. Borer, M. Borghini, G. Carboni, V. Cavasinni, P. Cenci, J.-C. Chollet, A.G. Clark, C. Conta, F. Costantini, P. Darriulat, B. de Lotto, T. del Prete, L. Dilella, J. Dines-Hansen, K. Einsweiler, L. Fayard, R. Ferrari, M. Fraternali, D. Froidevaux, J.-M. Gaillard, O. Gildemeister, V.G. Goggi, C. Gössling, B. Hahn, H. Hänni, J.R. Hansen, P. Hansen, K. Hara, N. Harnew, E. Hugentobler, E. Iacopini, L. Iconomidou-Fayard, K. Jakobs, P. Jenni, E.E. Kluge, O. Kofoed-Hansen, E. Lançon, P. Lariccia, M. Livan, S. Loucatos, B. Madsen, B. Mansoulié, G.C. Mantovani, L. Mapelli, K. Meier, B. Merkel, R. Möllerud, M. Moniez, R. Moning, M. Morganti, C. Onions, T. Pal, M.A. Parker, G. Parrour, F. Pastore, M. Pepe, Ch. Petridou, H. Plothow-Besch, M. Polverel, L. Rasmussen, J.-P. Repellin, A. Roussarie, V. Ruhlmann, G. Sauvage, J. Schacher, F. Stocker, M. Swartz, J. Teiger, K. Tittel, S.N. Tovey, W.Y. Tsang, M. Valdata-Nappi, V. Vercesi, A.R. Weidberg, M. Wunsch, and H. Zaccone

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Luminosity (scattering theory), Parton, Jet (particle physics), law.invention, Momentum, Nuclear physics, law, W and Z bosons, High Energy Physics::Experiment, Collider
Abstract

A study has been made of the production characteristics of W and Z bosons produced at the CERN p p Collider. The event sample consists of 251 W→ev decays, and 39 Z→e + e − decays, identified by the UA2 detector, and corresponds to an integrated luminosity of 142 nb −1 at √ s = 546 GeV, and 768 nb −1 at √ s = 630 GeV. Measurements of W and Z production cross sections, of longitudinal and transverse momentum distributions, and of associated jet production, are presented. These measurements are compared with theoretical expectations, which include higher order QCD effects.

Published
1987

29. JET MEASURES AND HADRONIC EVENT SHAPES AT THE CERN anti-p p COLLIDER

Author

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

Subjects
Physics, Range (particle radiation), Particle physics, Large Hadron Collider, Physics and Astronomy (miscellaneous), Calorimeter (particle physics), Hadron, Parton, law.invention, Nuclear physics, Transverse plane, law, Phase space, High Energy Physics::Experiment, Nuclear Experiment, Collider, Engineering (miscellaneous), Particle Physics - Experiment
Abstract

We analyze the energy density distribution in harronic final states as a function of their total transverse energy measured in the segmented central calorimeter of the UA2 detector. The energy dependence of collective shape variables is investigated. The data, collected at the CERN $$\bar p$$ p Collider at $$\sqrt s = 630$$ GeV, exhibit strong variations in all these variables over the transverse energy range between 15 and 210 GeV, corresponding to substantial modifications in the structure of multihadronic final states. The evolution of the energy density distribution and of the collective shape variables shows a clear transition between two extreme dynamical regimes, respectively dominated byp T -limited phase space and by collimated two-jet configurations. A study of the relative populations of two-and three-jet systems reveals two different sources of configurations having three distinct lobes in the pattern of the energy-flow. A first component, steeply falling with energy, receives substantial contributions from soft parton collisions at lower transverse energies. Above 60 GeV a new hard component emerges, characterized by an approximately constant rate with respect to the dominant two-jet structures.

Published
1987

30. Observation of single isolated electrons of high transverse momentum in events with missing transverse energy at the CERN $\overline{p}$p collider

Author

F. Stocker, A. F. Rothenberg, L. Di Lella, Allan G Clark, P. Mani, G. Stimpfl, P. H. Hansen, Michele Livan, Marco Fraternali, G. Parrour, W. Zeller, J. Schacher, J. P. Repellin, A. Roussarie, A. R. Weidberg, Eric Lancon, G. Sauvage, M. Borghini, V. G. Goggi, H. Grote, V. Hungerbühler, R. Mollerud, H. Zaccone, B.S. Nilsson, Louis Fayard, J. M. Gaillard, J. Dines-Hansen, F. Bonaudi, M. Polverel, H. Plothow-Besch, John H. L. Hansen, Roberto Battiston, H. Hänni, G.C. Mantovani, Daniel Froidevaux, C. Conta, Livio Mapelli, M. Banner, K. Borer, Fr. Pastore, M. Mermikides, B. Madsen, P. Darriulat, O. Gildemeister, B. Merkel, J. Teiger, O. Kofoed-Hansen, B. Hahn, H.M. Steiner, Ph. Bloch, Bruno Mansoulie, J. L. Siegrist, J. C. Chollet, Peter Jenni, C. Onions, Sotiris Loucatos, P. A. Dorsaz, Valerio Vercesi, and T. Himel

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Electroweak interaction, Electron, law.invention, Nuclear physics, Azimuth, Transverse plane, law, Transverse momentum, Nuclear Experiment, Collider, Energy (signal processing), Particle Physics - Experiment
Abstract

We report the results of a search for single isolated electrons of high transverse momentum at the CERN p p collider. Above 15 GeV/c, four events are found having large missing transverse energy along a direction opposite in azimuth to that of the high-pT electron. Both the configuration of the events and their number are consistent with the expectations from the process p + p → W ± + anything , with W→e+ν, where W± is the charged Intermediate Vector Boso postulated by the unified electroweak theory.

Published
1983

31. MEASUREMENT OF THE STRONG COUPLING CONSTANT-ALPHA-S FROM A STUDY OF W BOSONS PRODUCED IN ASSOCIATION WITH JETS

Author

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

Subjects
Coupling constant, Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, Jet (fluid), Hadron, Elementary particle, law.invention, Nuclear physics, Particle decay, law, High Energy Physics::Experiment, Collider, Particle Physics - Experiment, Boson
Abstract

The UA2 experiment at the CERN p p Collider has identified a total sample of 251 W→eν events. Among this sample 221 events are found without jets and 29 with one jet. The yield of one-jet events relative to that of zero-jet events provides a measurement of the strong coupling constant: αs(Mw2)=0.13±0.03(stat)±0.03±(syst1)±0.02(syst2), where syst1 represents the experimental systematic error and syst2 is an estimate of the theoretical uncertainty.

Published
1988

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