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1. The Drift Chambers Of The Nomad Experiment

Author

Anfreville, M., Astier, P., Authier, M., Baldisseri, A., Banner, M., Besson, N., Bouchez, J., Castera, A., Cloue, O., Dumarchez, J., Dumps, L., Gangler, E., Gosset, J., Hagner, C., Jollec, C., Lachaud, C., Letessier, A., Levy, J. M., Linssen, L., Meyer, J. P., Ouriet, J. P., Passerieux, J. P., Pedrol, T., Placci, A., Poinsignon, J., Popov, B., Rathouit, P., Schahmaneche, K., Stolarczyk, T., Uros, V., Vannucci, F., Vo, M., and Zaccone, H.

Subjects
High Energy Physics - Experiment
Abstract

We present a detailed description of the drift chambers used as an active target and a tracking device in the NOMAD experiment at CERN. The main characteristics of these chambers are a large area, a self supporting structure made of light composite materials and a low cost. A spatial resolution of 150 microns has been achieved with a single hit efficiency of 97%., Comment: 42 pages, 26 figures

Published
2001
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2. New results on a search for a 33.9 MeV/c2 neutral particle from π+ decay in the NOMAD experiment

Author

T. Weisse, J.-P. Mendiburu, K. Benslama, H. Zaccone, Alessandro Cardini, H. Pessard, Marco Fraternali, P. Rathouit, C. Joseph, Fr Pastore, B. A. Popov, P. Hurst, V. Flaminio, M. T. Tran, C. Lachaud, F. J. P. Soler, L. Di Lella, Giacomo Graziani, G. Bassompierre, S. Boyd, M. Valdata-Nappi, Marco Laveder, J.M. Gaillard, Roberto Ferrari, B. Lakić, G. N. Taylor, D. Steele, E. Gangler, J. Dumarchez, M. C. Gonzalez-Garcia, K. Schahmaneche, F. Juget, J. A. Hernando, Malcolm Ellis, M. Kirsanov, Th. Stolarczyk, A.-M. Touchard, O. Klimov, R. Cousins, Bruce Yabsley, J.J. Gómez-Cadenas, X. Méchain, J. Rico, A. Marchionni, J.-M. Vieira, Valerio Vercesi, A. Cervera-Villanueva, M. E. Sevior, Dmitry V. Naumov, Kevin Varvell, C. Nguyen-Mau, A. Placci, L. Camilleri, R. Petti, Stefano Lacaprara, A. Kovzelev, Fergus Wilson, T. Del Prete, Caroline Poulsen, E. do Couto e Silva, F. Salvatore, Vyacheslav Valuev, A. De Santo, E. Pennacchio, N. Hyett, S.A. Bunyatov, J. Bouchez, F. Vannucci, M. Gouanère, H. Degaudenzi, G. J. Feldman, J-P. Meyer, S. N. Tovey, I. Bird, A. Lupi, G. F. Moorhead, A. Grant, D. Hubbard, P. Zuccon, J.-M. Levy, G. Collazuol, Mario Stipčević, Didier Ferrere, G. Conforto, Barry Blumenfeld, L.J. Winton, A. Baldisseri, Claus Gößling, J. Kokkonen, G. Vidal-Sitjes, Sergei Gninenko, A. Krasnoperov, P. Nédélec, M. Mezzetto, T. Vinogradova, Nathalie Besson, D. Sillou, J. Ulrichs, Kai Zuber, E. Tsesmelis, Caren Hagner, T. Fazio, André Rubbia, A. Godley, G. Sozzi, A. Guglielmi, S.R. Mishra, Chiara Roda, L. Linssen, D. Pollmann, E. Iacopini, P. Astier, D. Autiero, F.V. Weber, A. Letessier-Selvon, D. Daniels, Giacomo Polesello, M. Tareb-Reyes, Vincenzo Cavasinni, J. Long, Domizia Orestano, F. Martelli, M. Contalbrigo, T. Dignan, U. Stiegler, A. Lanza, J. Gosset, D. Gibin, A. Polyarush, Achim Geiser, L. S. Peak, M. Veltri, Antonio Bueno, A. N. Toropin, L. La Rotonda, M. Baldo-Ceolin, M. Banner, D. Geppert, P.W. Cattaneo, Ante Ljubičić, F. Bobisut, N.V. Krasnikov, C. Conta, B. Schmidt, Yu. Nefedov, L. Vacavant, and V. Tereshchenko

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Neutrino decay, Neutrino mixing, Branching fraction, Nuclear physics, Pion, Pi, Direct search, Anomaly (physics), Neutral particle, Event (particle physics), KARMEN
Abstract

We report on a direct search in NOMAD for a new 33.9 MeV/c^2 neutral particle (X) produced in pion decay in flight, pi-->mu_X followed by the decay X -->nu e^+e^-. Both decays are postulated to occur to explain the time anomaly observed by the KARMEN experiment. From the analysis of the data collected during the 1996?1998 runs with 4.1×10^19 protons on target, a single candidate event consistent with background expectations was found. The search is sensitive to a pion branching ratio BR(pi-->muX >3.7×10^-15, significantly smaller than previous experimental limits.

Published
2002

3. Measurement of the polarization in charged current interactions in the NOMAD experiment

Author

T. Weisse, D. Sillou, F. Salvatore, Vyacheslav Valuev, A. Godley, A. Guglielmi, H. Zaccone, G. J. Feldman, G. F. Moorhead, C. Gssling, B. Schmidt, T. Fazio, O.L. Klimov, Laurent Vacavant, S. Tereshchenko, J. M. Levy, C. Joseph, Michel Gouanère, A. Placci, S.R. Mishra, F. F. Wilson, F. Bobisut, D. Autiero, Frédéric Juget, U. Stiegler, C. Nguyen-Mau, J. Long, E. Tsesmelis, Caren Hagner, R. Petti, D. Geppert, P.W. Cattaneo, Ante Ljubičić, Caroline Poulsen, A. De Santo, A. Polyarush, J.M. Gaillard, P. Rathouit, Achim Geiser, S.A. Bunyatov, J. Kokkonen, Marco Laveder, D. Hubbard, P. Zuccon, J.-P. Mendiburu, Artem Chukanov, J. A. Hernando, I. Bird, A. Lanza, K. Benslama, T. Vinogradova, R. Cousins, Alessandro Cardini, Marco Fraternali, L. La Rotonda, T. Schmidt, A. Lupi, J.-M. Vieira, D. Kustov, Didier Ferrere, L. Linssen, F. Vannucci, M. T. Tran, T. Dignan, T. Del Prete, L. S. Peak, A. M. Touchard, M. Contalbrigo, Roberto Ferrari, Valerio Vercesi, F.V. Weber, Nathalie Besson, C. Conta, M. Kirsanov, E. Gangler, G. Collazuol, Mario Stipčević, Malcolm Ellis, M. Valdata-Nappi, Sergei Gninenko, Antonio Bueno, A. N. Toropin, V. Flaminio, Domizia Orestano, P. Hurst, Kevin Varvell, Dmitry V. Naumov, G. Polesello, M. Banner, F. J. P. Soler, A. Baldisseri, P. Riemann, A. Letessier-Selvon, Alastair Grant, Bruce Yabsley, X. Méchain, André Rubbia, H. Degaudenzi, L. Di Lella, S. B. Boyd, J. Gosset, H. Pessard, P. Nedelec, Chiara Roda, D. Daniels, J.J. Gómez-Cadenas, D. Steele, G. Conforto, Barry Blumenfeld, J. Rico, C. Lachaud, A. Cervera-Villanueva, N. Hyett, D. Pollmann, G. Bassompierre, E. Iacopini, M. Tareb-Reyes, A. Marchionni, Valentin Kuznetsov, B. A. Popov, S. Lacaprara, E. Pennacchio, D. Gibin, K. Schahmaneche, E Silva E. Do Couto, J-P. Meyer, M. E. Sevior, M. Veltri, J. Dumarchez, L. Camilleri, L.J. Winton, F. Martelli, G. Graziani, B. Lakić, Vincenzo Cavasinni, G. N. Taylor, J. Ulrichs, J. Bouchez, Yu. Nefedov, G. Sozzi, A. Kovzelev, T. Stolarczyk, M. Mezzetto, Kai Zuber, P. Astier, Alexey Krasnoperov, M. Baldo-Ceolin, S.N. Tovey, and Fr Pastore

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Hadron, Polarization (waves), Lambda, 01 natural sciences, Nuclear physics, 0103 physical sciences, Bubble chamber, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, 010306 general physics, Nucleon, Order of magnitude, Charged current
Abstract

The $\Lambda$ polarization in $\nu_\mu$ charged current interactions has been measured in the NOMAD experiment. The event sample (8087 reconstructed $\Lambda$'s) is more than an order of magnitude larger than that of previous bubble chamber experiments, while the quality of event reconstruction is comparable. We observe negative polarization along the $W$-boson direction which is enhanced in the target fragmentation region: $P_x (x_F 0) = -0.21 \pm 0.04 \mbox{(stat)} \pm 0.02 \mbox{(sys)}$. In the current fragmentation region we find $P_x (x_F 0) = -0.09 \pm 0.06 \mbox{(stat)} \pm 0.03 \mbox{(sys)}$. These results provide a test of different models describing the nucleon spin composition and the spin transfer mechanisms. A significant transverse polarization (in the direction orthogonal to the $\Lambda$ production plane) has been observed for the first time in a neutrino experiment: $P_y = -0.22 \pm 0.03 \mbox{(stat)} \pm 0.01 \mbox{(sys)}$. The dependence of the absolute value of $P_y$ on the $\Lambda$ transverse momentum with respect to the hadronic jet direction is in qualitative agreement with the results from unpolarized hadron-hadron experiments.

Published
2000

4. Limit on νe→ντ oscillations from the NOMAD experiment

Author

J. A. Hernando, D. Steele, H. Pessard, Roberto Ferrari, M. Steininger, C. Lachaud, Malcolm Ellis, J.J. Gómez-Cadenas, Bruce Yabsley, A. Cervera-Villanueva, L. Camilleri, X. Méchain, J. Kokkonen, F. Martelli, T. Weisse, A. Krasnoperov, S. Bunyatov, Achim Geiser, A. N. Toropin, Th. Stolarczyk, E. Pennacchio, M. Mezzetto, D. Sillou, P. Rathouit, Giacomo Graziani, N. Hyett, A. Letessier-Selvon, S.N. Tovey, Kai Zuber, Fr Pastore, E. do Couto e Silva, M. E. Sevior, M. Veltri, G. Bassompierre, D. Daniels, M. Gouanère, M. Tareb-Reyes, J. M. Gaillard, T. Vinogradova, A. Godley, Valentin Kuznetsov, J. Dumarchez, S. Boyd, J. Long, D. Geppert, Caroline Poulsen, J-P. Meyer, L. Linssen, P.W. Cattaneo, Ante Ljubičić, B. Lakić, L.J. Winton, U. Stiegler, Marco Fraternali, G. N. Taylor, J. Ulrichs, Chiara Roda, D. Pollmann, H. Degaudenzi, J.-P. Mendiburu, G. J. Feldman, F. Salvatore, G. F. Moorhead, G. Sozzi, Valerio Vercesi, Kevin Varvell, G. Polesello, F. V. Weber, Alessandro Cardini, Domizia Orestano, Claus Gößling, J. Gosset, O. Klimov, A. Grant, M. Baldo-Ceolin, D. Gibin, H. Zaccone, C. Nguyen-Mau, T. Del Prete, P. Hurst, A. Polayrush, K. Benslama, Vyacheslav Valuev, F. Vannucci, C. Joseph, A. Guglielmi, L. Di Lella, F. Juget, A. Lanza, M. Valdata-Nappi, M. T. Tran, T. Dignan, A. Pluquet, L.S. Peak, M. Kirsanov, G. Ballocchi, D. Hubbard, P. Zuccon, K. Schahmaneche, L. La Rotonda, S. R. Mishra, M. Banner, Marco Laveder, E. Gangler, M. Contalbrigo, A. Bueno, Nathalie Besson, P. Riemann, R. Cousins, J.-M. Vieira, I. Bird, J. Rico, A. Marchionni, A. Kovzelev, André Rubbia, Barry Blumenfeld, E. Iacopini, Vincenzo Cavasinni, D. Autiero, V. Flaminio, F. J. P. Soler, Didier Ferrere, Sergei Gninenko, P. Astier, E. Tsesmelis, Caren Hagner, T. Schmidt, J. Bouchez, A. Lupi, A. Baldisseri, S. Lacaprara, Yu. Nefedov, L. Vacavant, A. Placci, F. Bobisut, A. De Santo, C. Conta, B. Schmidt, G. Conforto, A. M. Touchard, P. Nédélec, J. M. Levy, R. Petti, Fergus Wilson, G. Collazuol, Mario Stipčević, and B. A. Popov

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, 0103 physical sciences, Context (language use), Limit (mathematics), Neutrino beam, 010306 general physics, Neutrino oscillation, 01 natural sciences, Charged current
Abstract

In the context of a two-flavour approximation we reinterpret the published NOMAD limit on ν μ → ν τ oscillations in terms of ν e → ν τ oscillations. At 90% C.L. we obtain sin 2 2θ eτ 5.2×10 −2 for large Δm 2 , while for sin 2 2 θ eτ =1 the confidence region includes Δm 2 2 / c 4 .

Published
2000

5. A more sensitive search for νμ→ντ oscillations in NOMAD

Author

F. Vannucci, V. Flaminio, Giacomo Graziani, F. J. P. Soler, O. Klimov, I.J. Donnelly, M. Banner, Caroline Poulsen, C. Nguyen-Mau, T. Del Prete, J. Dumarchez, Domizia Orestano, K. Benslama, André Rubbia, E. Pennacchio, N. Hyett, A. Lanza, E. Tsesmelis, Caren Hagner, T. Weisse, E. Iacopini, T. Vinogradova, M. T. Tran, I. Bird, P. Astier, Th. Stolarczyk, S. Bunyatov, F. Salvatore, B.D Yabsley, M. K. Vo, Vincenzo Cavasinni, Nathalie Besson, G. Renzoni, T. Schmidt, Antonio Bueno, A. N. Toropin, D. Autiero, P. Hurst, S.N. Tovey, G. J. Feldman, L. La Rotonda, Fr Pastore, A. Krasnoperov, E. Gangler, Didier Ferrere, Marco Fraternali, L. Di Lella, P. Rathouit, G. F. Moorhead, J. Kokkonen, J. Long, A Gandolfo, A. Kovzelev, A. Baldisseri, M. E. Sevior, M. Contalbrigo, A. M. Touchard, P. Nédélec, C. Conta, B. Schmidt, M. Kirsanov, D. Geppert, A. Godley, A. Guglielmi, J. A. Hernando, P.W. Cattaneo, Ante Ljubičić, Roberto Renò, E Manola-Poggioli, P. Riemann, J.-P. Mendiburu, L. Linssen, A. Cervera-Villanueva, G. Collazuol, Mario Stipčević, G. Conforto, S.R. Mishra, T. Dignan, Alessandro Cardini, A. Placci, E. do Couto e Silva, R. Petti, H. Pessard, U. Stiegler, J. Bouchez, Valerio Vercesi, Chiara Roda, A. De Santo, M. Veltri, J. M. Levy, F. Bobisut, B Popov, D. Verkindt, A. Lupi, L. Camilleri, Kevin Varvell, Stefano Lacaprara, A. Grant, J. Rico, A. Marchionni, Fergus Wilson, H. Zaccone, D. Pollmann, Malcolm Ellis, Roberto Ferrari, Vyacheslav Valuev, S.A. Volkov, C. Joseph, J.-M. Gaillard, Barry Blumenfeld, G. Ballocchi, J.J. Gómez-Cadenas, R. Cousins, Marco Laveder, D. Hubbard, P. Zuccon, K. Schahmaneche, M. Baldo-Ceolin, X. Méchain, F.V. Weber, J.-M. Vieira, Yu. Nefedov, L. Vacavant, J. Gosset, D. Gibin, T. Fazio, Achim Geiser, L.S. Peak, M Valdata-Nappi, M. Gouanère, G. Bassompierre, M. Mezzetto, D. Sillou, Kai Zuber, S. Boyd, B. Lakić, G. N. Taylor, Claus Gößling, D. Steele, L. Mossuz, F. Juget, M. Steininger, H Degaudenzi, C. Lachaud, G Segneri, V. Tereshchenko, A. Pluquet, F. Martelli, S. N. Gninenko, A. Letessier-Selvon, D. Daniels, Giacomo Polesello, M. Tareb-Reyes, Valentin Kuznetsov, J-P. Meyer, L.J. Winton, J. Ulrichs, and G. Sozzi

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Oscillation, Scattering, High Energy Physics::Experiment, Sensitivity (control systems), Neutrino, Neutrino beam, Neutrino oscillation, Charged current, Confidence region
Abstract

With additional data and improved algorithms, we have enhanced the sensitivity of our appearance search for $\numunutau$ oscillations in the NOMAD detector in the CERN-SPS wide-band neutrino beam. The search uses kinematic criteria to identify $\nutau$ charged current interactions followed by decay of the $\tau^-$ to one of several decay modes. Our ``blind'' analyses of deep-inelastic scattering data taken in 1996 and 1997, combined with consistent reanalyses of previously reported 1995 data, yield no oscillation signal. For the two-family oscillation scenario, we present the contour outlining a 90\% C.L. confidence region in the $\sin^22\theta_{\mu \tau} - \Delta m^2$ plane. At large $\Delta m^2$, the confidence region includes $\sin^22\theta_{\mu\tau}\ \ 1.2\times10^{-3}$ (a limit 3.5 times more stringent than in our previous publication), while at $\sin^22\theta_{\mu \tau}=1$, the confidence region includes $\Delta m^2 1.2$ eV$^2$/$c^4$.

Published
1999

6. Precision measurement of scaled momentum, charge multiplicity, and thrust in νμN and interactions

Author

H. Degaudenzi, G. J. Feldman, G. F. Moorhead, Valentin Kuznetsov, F. Salvatore, F. Vannucci, M. K. Vo, Corrado Angelini, J. Long, L.J. Winton, B. A. Popov, G. Collazuol, Mario Stipčević, J. M. Levy, J. Ulrichs, D. Verkindt, S.A. Bunyatov, P. Rathouit, M. Banner, Fergus Wilson, G. Sozzi, Alexey Krasnoperov, B. Schmidt, E. Manola-Poggioli, T. Dignan, J. Altegoer, Caroline Poulsen, M. Baldo-Ceolin, S. Basa, J. Kokkonen, R. Cousins, Nathalie Besson, G. Renzoni, T. Vinogradova, L. Linssen, Achim Geiser, Giacomo Graziani, J.-M. Vieira, M. E. Sevior, A. Baldisseri, Valerio Vercesi, S. N. Gninenko, André Rubbia, O.L. Klimov, P. Hurst, Marco Fraternali, T. Stolarczyk, M. Serrano, Kevin Varvell, A. Grant, H. Pessard, P. Nedelec, P. Astier, L. Camilleri, A. Kovzelev, S. Tereshchenko, D. Autiero, J. Dumarchez, Vyacheslav Valuev, E. do Couto e Silva, J. Hernando, D. Hubbard, P. Zuccon, Malcolm Ellis, Chiara Roda, J.J. Gómez-Cadenas, E. Iacopini, C. Lazzeroni, D. Sillou, A. Guglielmi, Vincenzo Cavasinni, A. Letessier-Selvon, D. Daniels, Giacomo Polesello, M. Tareb-Reyes, F. Bobisut, S.A. Volkov, L. Di Lella, Roberto Ferrari, M. Kirsanov, Bruce Yabsley, X. Méchain, F.V. Weber, M. Veltri, V. Uros, E. Pennacchio, N. Hyett, D. Pollmann, I. Bird, V. Vacavant, Michel Gouanère, F. Martelli, M. Valdata-Nappi, A. Godley, J-P. Meyer, D. Nordmann, A. Cervera-Villanueva, K. Benslama, L. La Rotonda, H. Zaccone, M. Werlen, S.R. Mishra, A. Lanza, U. Stiegler, S. Lacaprara, C. Joseph, Yu. Nefedov, T. Fazio, G. Ballocchi, A. Pluquet, C. Conta, Frédéric Juget, Marco Laveder, Barry Blumenfeld, M. T. Tran, Domizia Orestano, E. Gangler, J. Gosset, R. Petti, G. Conforto, D. Gibin, K. Schahmaneche, M. Contalbrigo, J.-P. Mendiburu, J. P. Perroud, G. Bassompierre, Alessandro Cardini, S. Boyd, G. N. Taylor, V. Flaminio, P. Galumian, F. J. P. Soler, D. Geppert, P.W. Cattaneo, Ante Ljubičić, A. Placci, L. S. Peak, A. De Santo, Antonio Bueno, Fr Pastore, A. N. Toropin, I.J. Donnelly, C. Nguyen-Mau, T. Del Prete, M. Mezzetto, Kai Zuber, S. N. Tovey, A. M. Touchard, J. Bouchez, D. Steele, L. Mossuz, A. Lupi, J. M. Gaillard, Didier Ferrere, A. Marchionni, M. Steininger, Claus Gößling, E. Tsesmelis, Caren Hagner, and T. Weisse

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Overline, Coherence effect, Electronic document, Thrust, Multiplicity (chemistry), Charged current
Abstract

By focusing on the notion of electronic document, we differentiate two evolutions which are useful to distinct titles: on the one hand are the documents, which have value of reference. Its administrator will take care to preserve its integrity and its context of production which is strongly significant. On the other hand are resources, evolutionary elements by nature, which the user must be able to appropriate and who must thus be placed at the disposal so that the production is erased, to focus on a logic of exploitation and service.

Published
1999

7. A search for ν→ν oscillations using the NOMAD detector

Author

M. Contalbrigo, T. Fazio, V. Flaminio, F. J. P. Soler, K. Benslama, T. Weisse, L.S. Peak, A. Lanza, E. do Couto e Silva, R. Petti, André Rubbia, F. Bobisut, D. Scannicchio, F. Juget, J-P. Meyer, L. La Rotonda, H. Pessard, E. Manola-Poggioli, M. Mezzetto, L.J. Winton, V. Valuev, M. T. Tran, D. Sillou, Kai Zuber, E. Iacopini, R. Cousins, J. Ulrichs, Kevin Varvell, G. Collazuol, Mario Stipčević, L. Linssen, A. Cervera-Villanueva, J.-M. Vieira, A. Grant, V. Tereshchenko, P. Rathouit, D. Pollmann, A. Pluquet, Giacomo Graziani, Didier Ferrere, G. Sozzi, F.V. Weber, D. Verkindt, P. Steffen, G. Conforto, Barry Blumenfeld, Th. Stolarczyk, Vincenzo Cavasinni, J. Gosset, A. Baldisseri, A. Marchionni, J. Altegoer, S.A. Volkov, E. Gangler, D. Kekez, P. Nédélec, Roberto Ferrari, S. N. Gninenko, J.-M. Gaillard, J. Long, M. Gouanère, J. M. Levy, M. E. Sevior, Marco Fraternali, Claus Gößling, A. Placci, M. Veltri, A. Letessier-Selvon, D. Gibin, G. Bassompierre, A. De Santo, D. Autiero, Caroline Poulsen, D. Daniels, E. Tsesmelis, J.-P. Mendiburu, Corrado Angelini, V. Uros, M. Valdata-Nappi, D. Steele, Bruce Yabsley, X. Méchain, Stefano Lacaprara, L. Mossuz, Giacomo Polesello, Fergus Wilson, Alessandro Cardini, M. Tareb-Reyes, B. G. Pope, M. Baldo-Ceolin, S. Boyd, D. Geppert, Achim Geiser, M. Steininger, H. Degaudenzi, T. Dignan, G. J. Feldman, P.W. Cattaneo, Ante Ljubičić, V.E. Kuznetsov, G. N. Taylor, S. Basa, J. Bouchez, G. F. Moorhead, A. Lupi, B. Khomenko, A. M. Touchard, S. Bunyatov, F. Salvatore, L. Camilleri, Yu. Nefedov, J. Kokkonen, M. K. Vo, A. Kovzelev, P. Hurst, T. Vinogradova, B. Popov, L. Vacavant, L. Di Lella, J. Hernando, D. Hubbard, K. Schahmaneche, C. Hagner, F. Martelli, U. Stiegler, C. Conta, S.N. Tovey, M. Kirsanov, I. Bird, P. Astier, Fr Pastore, Domizia Orestano, H. Plothow-Besch, Antonio Bueno, A. N. Toropin, F. Vannucci, J. P. Perroud, A. Sconza, P. Galumian, M. Banner, J.J. Gómez-Cadenas, A. Castera, O. Klimov, I.J. Donnelly, C. Nguyen-Mau, T. Del Prete, E. Pennacchio, N. Hyett, G. Fumagalli, M. Werlen, S.R. Mishra, Chiara Roda, B. Schmidt, Valerio Vercesi, M. Serrano, H. Zaccone, C. Joseph, G. Ballocchi, Marco Laveder, Nathalie Besson, G. Renzoni, C. Lazzeroni, A. Guglielmi, and J. Dumarchez

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Oscillation, Detector, High Energy Physics::Experiment, Detection theory, Wide band, Neutrino oscillation, Signal, Charged current, Beam (structure)
Abstract

NOMAD is a neutrino oscillation experiment designed to search for ντ appearance in the CERN-SPS wide band νμ beam. Signal detection relies on the identification of ντ charged current interactions using kinematic criteria. The analysis of the 1995 data sample yields no oscillation signal. Combining all studied τ decay modes, a limit of sin 2 2θ μτ 4.2×10 −3 is obtained for large Δm2 at the 90% confidence level.

Published
1998

8. The Drift Chambers Of The Nomad Experiment

Author

M Anfreville, P Astier, M Authier, A Baldisseri, M Banner, N Besson, J Bouchez, A Castera, O Cloué, J Dumarchez, L Dumps, E Gangler, J Gosset, C Hagner, C Jollec, C Lachaud, A Letessier-Selvon, J.-M Levy, L Linssen, J.-P Meyer, J.-P Ouriet, J.-P Passérieux, T.Pedrol Margaley, A Placci, A Pluquet, J Poinsignon, B.A Popov, P Rathouit, K Schahmaneche, T Stolarczyk, V Uros, F Vannucci, M.K Vo, H Zaccone, Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), European Organization for Nuclear Research (CERN), and NOMAD

Subjects
Active target, Physics, Nuclear and High Energy Physics, Particle physics, Spatial resolution, Large Hadron Collider, Drift chambers, 010308 nuclear & particles physics, business.industry, Tracking, Neutrino oscillations, FOS: Physical sciences, Tracking (particle physics), 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Optics, 29.40.Gx, 07.05.Kf, 13.15.+g, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Detectors and Experimental Techniques, 010306 general physics, business, Instrumentation, Image resolution
Abstract

We present a detailed description of the drift chambers used as an active target and a tracking device in the NOMAD experiment at CERN. The main characteristics of these chambers are a large area, a self supporting structure made of light composite materials and a low cost. A spatial resolution of 150 microns has been achieved with a single hit efficiency of 97%., Comment: 42 pages, 26 figures

Published
2002

9. Neutrino production of opposite sign dimuons in the NOMAD experiment

Author

Malcolm Ellis, J.J. Gómez-Cadenas, E. Manola-Poggioli, Alexey Krasnoperov, F. Salvatore, M. K. Vo, M. Baldo-Ceolin, K. Benslama, O.L. Klimov, T. Vinogradova, S. Tereshchenko, M. Mezzetto, E. do Couto e Silva, J. Long, Kai Zuber, J. Dumarchez, Vyacheslav Valuev, J. Bouchez, B. A. Popov, M. T. Tran, C. Nguyen-Mau, T. Del Prete, A. Lupi, J. M. Gaillard, D. Hubbard, P. Zuccon, K. Schahmaneche, D. Verkindt, Caroline Poulsen, R. Cousins, A. Marchionni, A. Godley, J.-M. Vieira, P. Astier, T. Dignan, P. Hurst, S.R. Mishra, E. Tsesmelis, Caren Hagner, L. Di Lella, M. Valdata-Nappi, I. Bird, T. Schmidt, F. Juget, M. Veltri, A. Kovzelev, Chiara Roda, A. Letessier-Selvon, Domizia Orestano, G. Collazuol, Mario Stipčević, M. E. Sevior, F. Bobisut, D. Daniels, Giacomo Polesello, A. Pluquet, M. Tareb-Reyes, Valentin Kuznetsov, M. Contalbrigo, J-P. Meyer, J.-P. Mendiburu, A. Placci, L. La Rotonda, Alessandro Cardini, Kevin Varvell, S.N. Tovey, L.J. Winton, M. Kirsanov, E. Pennacchio, N. Hyett, Fr Pastore, André Rubbia, A. Grant, H. Pessard, P. Nedelec, J. Ulrichs, E. Iacopini, A. De Santo, Vincenzo Cavasinni, G. Sozzi, Barry Blumenfeld, C. Conta, Claus Gößling, B. Schmidt, G. Conforto, Michel Gouanère, J. Kokkonen, F. Martelli, Nathalie Besson, J. A. Hernando, D. Steele, L. Mossuz, D. Sillou, R. Petti, A. Guglielmi, M. Steininger, Roberto Ferrari, J. M. Levy, A. Lanza, Stefano Lacaprara, Fergus Wilson, G. Bassompierre, S. Boyd, B. Lakić, G. N. Taylor, Giacomo Graziani, Yu. Nefedov, L. Vacavant, A. Cervera-Villanueva, Bruce Yabsley, X. Méchain, L. Camilleri, H. Degaudenzi, G. J. Feldman, G. F. Moorhead, D. Autiero, A. M. Touchard, V. Flaminio, F. J. P. Soler, A. Polyarush, Achim Geiser, T. Weisse, P. Rathouit, Marco Fraternali, L. Linssen, J. Gosset, Didier Ferrere, Sergei Gninenko, D. Pollmann, D. Gibin, T. Stolarczyk, F.V. Weber, F. Vannucci, M. Banner, Antonio Bueno, A. N. Toropin, U. Stiegler, T. Fazio, H. Zaccone, E. Gangler, D. Geppert, C. Joseph, P.W. Cattaneo, Ante Ljubičić, L.S. Peak, S.A. Bunyatov, A. Baldisseri, G. Ballocchi, Marco Laveder, Valerio Vercesi, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), NOMAD, and BOMBAR, Claudine

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], 010308 nuclear & particles physics, Branching fraction, Order (ring theory), Física, 01 natural sciences, Charm quark, Nuclear physics, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Production (computer science), Neutrino, 010306 general physics, Nucleon, Particle Physics - Experiment, Energy (signal processing)
Abstract

The NOMAD Collaboration presents a study of opposite sign dimuon events in the framework of Leading Order QCD. A total of 2714 neutrino- and 115 antineutrino-induced opposite sign dimuon events with $E_{\mu 1}, E_{\mu 2} > 4.5$ GeV, $15 < E_{\nu} < 300$ GeV and $Q^{2} > 1\;(\mbox{GeV}/\mbox{c})^{2}$ are observed %in the data from the 1995 and 1996 runs. in the Front-Calorimeter of NOMAD during the 1995 and 1996 runs. The analysis yields a value for the charm quark mass of $m_{c} = 1.3^{+0.3\;+0.3}_{-0.3\;-0.3}\;\mbox{GeV}/\m box{c}^{2}$ and for the average semileptonic branching ratio of $B_{c} = 0.095^{+0.007\;+0.014}_{-0.007\;-0.013}$. The ratio of the strange to non-strange sea in the nucleon is measured to be $\kappa = 0.48^{+0.09 +0.17}_{-0.07 -0.12}$. The measured rate of charm-induced dimuon relative to single muon, as a function of neutrino energy, is consistent with the slow rescaling hypothesis of heavy quark production.

Published
2000

10. Search for a new gauge boson in $\pi^{0}$ decays

Author

J. Altegoer, P. Astier, D. Autiero, A. Baldisseri, M. Baldo-Ceolin, G. Ballocchi, M. Banner, S. Basa, G. Bassompierre, K. Benslama, N. Besson, I. Bird, B. Blumenfeld, F. Bobisut, J. Bouchez, S. Boyd, A. Bueno, S. Bunyatov, L. Camilleri, A. Cardini, A. Castera, P.W. Cattaneo, V. Cavasinni, A. Cervera-Villanueva, G.M. Collazuol, G. Conforto, C. Conta, M. Contalbrigo, R. Cousins, D. Daniels, A.De Santo, T.Del Prete, T. Dignan, L.Di Lella, E. do Couto e Silva, I.J. Donnelly, J. Dumarchez, T. Fazio, G.J. Feldman, R. Ferrari, D. Ferrère, V. Flaminio, M. Fraternali, J-M. Gaillard, P. Galumian, E. Gangler, A. Geiser, D. Geppert, D. Gibin, S.N. Gninenko, J-J. Gomez-Cadenas, J. Gosset, C. Gößling, M. Gouanère, A. Grant, G. Graziani, A. Guglielmi, C. Hagner, J. Hernando, D. Hubbard, P. Hurst, N. Hyett, E. Iacopini, C. Joseph, D. Kekez, B. Khomenko, M.M. Kirsanov, O. Klimov, J. Kokkonen, A.V. Kovzelev, V. Kuznetsov, S. Lacaprara, A. Lanza, L. La Rotonda, M. Laveder, A. Letessier-Selvon, J-M. Levy, L. Linssen, A. Ljubičić, J. Long, A. Lupi, E. Manola-Poggioli, A. Marchionni, F. Martelli, X. Méchain, J-P. Mendiburu, J-P. Meyer, M. Mezzetto, S.R. Mishra, G.F. Moorhead, L. Mossuz, P. Nédélec, Yu. Nefedov, C. Nguyen-Mau, D. Orestano, F. Pastore, L.S. Peak, E. Pennacchio, J-P. Perroud, H. Pessard, R. Petti, A. Placci, H. Plothow-Besch, A. Pluquet, G. Polesello, D. Pollmann, B.G. Pope, B. Popov, C. Poulsen, P. Rathouit, C. Roda, A. Rubbia, F. Salvatore, D. Scannicchio, K. Schahmaneche, B. Schmidt, A. Sconza, M. Serrano, M.E. Sevior, D. Sillou, F.J.P. Soler, G. Sozzi, D. Steele, P. Steffen, M. Steininger, U. Stiegler, M. Stipčević, T. Stolarczyk, M. Tareb-Reyes, G.N. Taylor, S. Tereshchenko, A.N. Toropin, A-M. Touchard, S.N. Tovey, M-T. Tran, E. Tsesmelis, J. Ulrichs, V. Uros, M. Valdata-Nappi, V. Valuev, F. Vannucci, K.E. Varvell, M. Veltri, V. Vercesi, D. Verkindt, J-M. Vieira, T. Vinogradova, M-K. Vo, S.A. Volkov, F. Weber, T. Weisse, M. Werlen, F. Wilson, L.J. Winton, B.D. Yabsley, H. Zaccone, and K. Zuber

Subjects
Physics, Nuclear and High Energy Physics, Gauge boson, Particle physics, Large Hadron Collider, Branching fraction, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, Física, High Energy Physics - Experiment, Pion, Coulomb, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, Primakoff effect, Energy (signal processing), Particle Physics - Experiment
Abstract

A search was made for a new light gauge boson $X$ which might be produced in $\pi^{0}\to\gamma + X$ decay from neutral pions generated by 450-GeV protons in the CERN SPS neutrino target. The X's would penetrate the downstream shielding and be observed in the NOMAD detector via the Primakoff effect, in the process of $X \to\pi^{0}$ conversion in the external Coulomb field of a nucleus. With $1.45\times10^{18}$ protons on target, 20 candidate events with energy between 8 and 140 GeV were found from the analysis of neutrino data. This number is in agreement with the expectation of 18.1$\pm$2.8 background events from standard neutrino processes. A new 90% C.L. upper limit on the branching ratio $Br(\pi^{0}\to\gamma + X)< (3.3 to 1.9) \times10^{-5}$ for $X$ masses ranging from 0 to 120 MeV/c^2 is obtained., Comment: 15 pages, LaTex, 6 eps figures included, submitted to Physics Letters B

Published
1998

11. Search for heavy neutrinos mixing with tau neutrinos

Author

P. Astier, D. Autiero, A. Baldisseri, M. Baldo-Ceolin, M. Banner, G. Bassompierre, K. Benslama, N. Besson, I. Bird, B. Blumenfeld, F. Bobisut, J. Bouchez, S. Boyd, A. Bueno, S. Bunyatov, L. Camilleri, A. Cardini, P.W. Cattaneo, V. Cavasinni, A. Cervera-Villanueva, G. Collazuol, G. Conforto, C. Conta, M. Contalbrigo, R. Cousins, D. Daniels, H. Degaudenzi, T. Del Prete, A. De Santo, T. Dignan, L. Di Lella, E. do Couto e Silva, I.J. Donnelly, J. Dumarchez, M. Ellis, T. Fazio, G.J. Feldman, R. Ferrari, D. Ferrère, V. Flaminio, M. Fraternali, J.-M. Gaillard, E. Gangler, A. Geiser, D. Geppert, D. Gibin, S.N. Gninenko, A. Godley, M.C. Gonzalez-Garcia, J.-J. Gomez-Cadenas, J. Gosset, C. Gößling, M. Gouanère, A. Grant, G. Graziani, A. Guglielmi, C. Hagner, J. Hernando, D. Hubbard, P. Hurst, N. Hyett, E. Iacopini, C. Joseph, F. Juget, M.M. Kirsanov, O. Klimov, J. Kokkonen, A.V. Kovzelev, N.V. Krasnikov, A. Krasnoperov, S. Lacaprara, C. Lachaud, B. Lakić, A. Lanza, L. La Rotonda, M. Laveder, A. Letessier-Selvon, J.-M. Levy, L. Linssen, A. Ljubičić, J. Long, A. Lupi, A. Marchionni, F. Martelli, X. Méchain, J.-P. Mendiburu, J.-P. Meyer, M. Mezzetto, S.R. Mishra, G.F. Moorhead, D. Naumov, P. Nédélec, Yu. Nefedov, C. Nguyen-Mau, D. Orestano, F. Pastore, L.S. Peak, E. Pennacchio, H. Pessard, R. Petti, A. Placci, G. Polesello, D. Pollmann, A. Polyarush, B. Popov, C. Poulsen, P. Rathouit, J. Rico, C. Roda, A. Rubbia, F. Salvatore, K. Schahmaneche, B. Schmidt, G. Segneri, M. Sevior, F.J.P. Soler, G. Sozzi, D. Steele, U. Stiegler, M. Stipčević, Th. Stolarczyk, M. Tareb-Reyes, G.N. Taylor, V. Tereshchenko, A.N. Toropin, A.-M. Touchard, S.N. Tovey, M.-T. Tran, E. Tsesmelis, J. Ulrichs, L. Vacavant, M. Valdata-Nappi, V. Valuev, F. Vannucci, K.E. Varvell, M. Veltri, V. Vercesi, G. Vidal-Sitjes, J.-M. Vieira, T. Vinogradova, F.V. Weber, T. Weisse, F.F. Wilson, L.J. Winton, B.D. Yabsley, H. Zaccone, K. Zuber, P. Zuccon, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), NOMAD, and BOMBAR, Claudine

Subjects
Nuclear and High Energy Physics, Particle physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Proton, FOS: Physical sciences, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Big Bang nucleosynthesis, Tau neutrino, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 010306 general physics, Mixing (physics), Physics, Range (particle radiation), 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Física, 3. Good health, neutrino mixing, neutrino decay, High Energy Physics::Experiment, Neutrino, Anomaly (physics), Event (particle physics), Particle Physics - Experiment
Abstract

We report on a search for heavy neutrinos ($\nus$) produced in the decay $D_s\to \tau \nus$ at the SPS proton target followed by the decay $\nudecay$ in the NOMAD detector. Both decays are expected to occur if $\nus$ is a component of $\nu_{\tau}$.\ From the analysis of the data collected during the 1996-1998 runs with $4.1\times10^{19}$ protons on target, a single candidate event consistent with background expectations was found. This allows to derive an upper limit on the mixing strength between the heavy neutrino and the tau neutrino in the $\nus$ mass range from 10 to 190 $\rm MeV$. Windows between the SN1987a and Big Bang Nucleosynthesis lower limits and our result are still open for future experimental searches. The results obtained are used to constrain an interpretation of the time anomaly observed in the KARMEN1 detector.\, Comment: 20 pages, 7 figures, a few comments added

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