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1. Characterizing TES power noise for future single optical-phonon and infrared-photon detectors

Author

C. W. Fink, S. L. Watkins, T. Aramaki, P. L. Brink, S. Ganjam, B. A. Hines, M. E. Huber, N. A. Kurinsky, R. Mahapatra, N. Mirabolfathi, W. A. Page, R. Partridge, M. Platt, M. Pyle, B. Sadoulet, B. Serfass, and S. Zuber

Subjects
Physics, QC1-999
Abstract

In this letter, we present the performance of a 100 μm × 400 μm × 40 nm W Transition-Edge Sensor with a critical temperature of 40 mK. This device has a noise equivalent power of 1.5×10-18 W/Hz, in a bandwidth of 2.6 kHz, indicating a resolution for Dirac delta energy depositions of 40 ± 5 meV (rms). The performance demonstrated by this device is a critical step toward developing a O(100) meV threshold athermal phonon detector for low-mass dark matter searches.

Published
2020
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2. Contact-Free Germanium Ionization and Phonon Detectors

Author

N. Mirabolfathi, J. J Yen, P. L. Brink, B. Cabrera, M. Daal, B. Serfass, B. Sadoulet, D. N. Seitz, K. M. Sundqvist, A. Tomada, Betty Young, Blas Cabrera, and Aaron Miller

Subjects
Physics, Condensed matter physics, Phonon, business.industry, Schottky barrier, chemistry.chemical_element, Germanium, Tungsten, Particle detector, Collimated light, chemistry, Ionization, Optoelectronics, business, Surface states
Abstract

A new method to study the origin of the dead‐layer in ionization‐phonon detectors was developed wherein the ionization is measured via a 25 micron gap between the collection electrodes and germanium absorber. Phonon signals are measured with small tungsten thermometers (Tc∼90 mK) varnished to the Ge substrates. The Ge samples were studied using collimated 241Am sources. With this geometry, different contributions to the “dead‐layer” effect can be studied independently: Carrier back diffusion, trapping on surface states, Schottky barrier lowering, etc.A new method to study the origin of the dead‐layer in ionization‐phonon detectors was developed wherein the ionization is measured via a 25 micron gap between the collection electrodes and germanium absorber. Phonon signals are measured with small tungsten thermometers (Tc∼90 mK) varnished to the Ge substrates. The Ge samples were studied using collimated 241Am sources. With this geometry, different contributions to the “dead‐layer” effect can be studied independently: Carrier back diffusion, trapping on surface states, Schottky barrier lowering, etc.

Published
2009

3. A Measurement of Electron and Hole Drift Velocities in a Germanium <100> CDMS Detector, at a Temperature of 31 milliKelvin

Author

K. M. Sundqvist, A. T. J. Phipps, C. N. Bailey, P. L. Brink, B. Cabrera, M. Daal, A. C. Y. Lam, N. Mirabolfathi, L. Novak, M. Pyle, B. Sadoulet, B. Serfass, D. Seitz, A. Tomada, J. J. Yen, Betty Young, Blas Cabrera, and Aaron Miller

Subjects
Physics, Free electron model, Electron mobility, chemistry, Electric field, Detector, chemistry.chemical_element, Germanium, Electron, Cryogenic Dark Matter Search, Atomic physics, Space charge
Abstract

The Cryogenic Dark Matter Search (CDMS) uses ultrapure germanium detectors at a temperature of approximately 40 mK. These detectors are maintained in a state where shallow impurities are well neutralized. Free electrons and holes, generated by particle events, are “hot” and remain out of equilibrium in the bulk. In this system, carrier drift and diffusion occur simultaneously with the generation of free carriers, and with recombination to localized bulk and surface states. These processes jointly affect the space charge distribution in the bulk and at the surfaces of our detectors. The impact of space charge on the electric field likely accounts for much of the phenomenology found in our detectors. Any ability to predict the evolution of the space charge distribution requires a fundamental understanding of carrier transport processes under our operating conditions. To this end, we have measured carrier drift velocities as a function of electric field in an high‐purity CDMS detector of germanium at a temperature of 31 mK. We adapted CDMS electronics to perform a high‐bandwidth measurement of charge propagation times for near‐surface events in our detector under test. We find that measured velocities coincide reasonably well with predictions made in our previous theory treatment. This indicates that carrier mobility is limited solely by phonon emission.

Published
2009

4. The Cryogenic Dark Matter Search (CDMS) : Present Status and Future

Author

P. L. Brink, Z. Ahmed, D. S. Akerib, C. N. Bailey, D. Balakishiyeva, D. A. Bauer, J. Beaty, R. Bunker, B. Cabrera, D. O. Caldwell, J. Cooley, E. do Couto e Silva, P. Cushman, F. DeJongh, M. R. Dragowsky, L. Duong, E. Figueroa-Feliciano, J. Filippini, M. Fritts, S. R. Golwala, D. R. Grant, J. Hall, R. Hennings-Yeomans, S. Hertel, A. Hojem, D. Holmgren, L. Hsu, M. E. Huber, O. Kamaev, M. Kos, M. Kiveni, S. W. Leman, R. Mahapatra, V. Mandic, K. A. McCarthy, D. Moore, N. Mirabolfathi, H. Nelson, L. Novak, R. W. Ogburn, M. Pyle, X. Qiu, E. Ramberg, W. Rau, A. Reisetter, T. Saab, B. Sadoulet, J. Sander, R. Schmitt, R. W. Schnee, D. N. Seitz, B. Serfass, K. M. Sundqvist, A. Tomada, G. Wang, P. Wikus, S. Yellin, J. Yoo, B. A. Young, Marvin L. Marshak, and Marshak, M. L.

Subjects
Physics, Particle physics, Upgrade, WIMP, Weakly interacting massive particles, Dark matter, Detector, Cryogenic Dark Matter Search
Abstract

The CDMS collaboration utilizes Ge detectors for their Weakly Interacting Massive Particle (WIMP) search at the Soudan mine, Minnesota. The final data run of CDMS II is complete and a detector upgrade for SuperCDMS has commenced. A SuperTower of five 1‐inch thick Ge crystals has been installed and undergoing commissioning. Its surface‐event rejection capability should allow SuperCDMS to continue to run background free for the next proposed phases: 15 kg Ge deployment at Soudan, and up to 150 kg Ge deployment at SNOLAB. Recent detector advances to allow a 1 tonne Ge experiment are also discussed.

Published
2009

5. Surface Electron Rejection from Ge Detector with Interleaved Charge and Phonon Channels

Author

M. Pyle, B. Serfass, P. L. Brink, B. Cabrera, M. Cherry, N. Mirabolfathi, L. Novak, B. Sadoulet, D. Seitz, K. M. Sundqvist, A. Tomada, J. J. Yen, B. A. Young, Betty Young, Blas Cabrera, and Aaron Miller

Subjects
Physics, Phonon, business.industry, media_common.quotation_subject, Detector, Bolometer, Biasing, Electron, Asymmetry, law.invention, Recoil, Optics, WIMP, law, Atomic physics, business, media_common
Abstract

To achieve the surface electron rejection required for ton scale dark matter searches with germanium, we have demonstrated an advanced interleaved charge and phonon detector. This iZIP design has both an outer charge and outer phonon sensor guard ring. There is 3D event position reconstruction from two inner phonon channels on one side that give x‐axis location, two on the other side that give y‐axis location, and timing and energy differences between the two sides for z‐axis location. Biasing with +2V on one side charge lines and −2V on opposite side charge lines with all interleaved phonon channels at ground gives us less than 1:3,000 leakage of surface electrons from 109Cd into the nuclear recoil band with 69% WIMP search volume efficiency. 1:1,000 rejection of surface electrons has also been demonstrated using charge asymmetry discrimination alone for an additional 10% volume loss. The double‐sided phonon channels themselves provide excellent surface electron rejection as well through both timing information and energy partition at greater than the 1:3,000 level independent of charge assymetry discrimination with 20% volume loss. Finally, the excellent energy resolution in both charge and phonons should allow for a < 6 keV WIMP search analysis threshold with full discrimination.

Published
2009

7. Evidence for Anomalous Lepton Production in e+−e− Annihilation

Author

M. L. Perl, G. S. Abrams, A. M. Boyarski, M. Breidenbach, D. D. Briggs, F. Bulos, W. Chinowsky, J. T. Dakin, G. J. Feldman, C. E. Friedberg, D. Fryberger, G. Goldhaber, G. Hanson, F. B. Heile, B. Jean-Marie, J. A. Kadyk, R. R. Larsen, A. M. Litke, D. Lüke, B. A. Lulu, V. Lüth, D. Lyon, C. C. Morehouse, J. M. Paterson, F. M. Pierre, T. P. Pun, P. A. Rapidis, B. Richter, B. Sadoulet, R. F. Schwitters, W. Tanenbaum, G. H. Trilling, F. Vannucci, J. S. Whitaker, F. C. Winkelmann, and J. E. Wiss

Published
1995

9. Prospects for high pressure gas scintillation chambers

Author

B. Sadoulet, G. Smith, J. Wilkerson, Shimon Weiss, T.K. Edberg, and A. Parsons

Subjects
Physics, Scintillation, Physics::Instrumentation and Detectors, business.industry, Astrophysics::High Energy Astrophysical Phenomena, Detector, chemistry.chemical_element, Gamma-ray astronomy, Particle detector, Nuclear physics, Optics, Xenon, chemistry, Scintillation counter, Measuring instrument, business, Image resolution
Abstract

We present the current developmental status and future potential of what we believe to be a very promising hard x‐ray andamma ray detector for x‐ray and g gamma−ray astronomy. This high pressure xenon gas scintillation imaging drift chamber combines excellent spatial resolution, very good energy resolution, good ime resolution, and extremely high sensitivity because of its excellent background rejection capabilities; and it offers possibilities for relatively easy extra‐polation to large area detectors. (AIP)

Published
1990

10. Carrier transport and phonon emission in germanium detectors of the cryogenic dark matter search

Author

B Sadoulet and K M Sundqvist

Subjects
Physics, History, Condensed matter physics, Phonon, Monte Carlo method, chemistry.chemical_element, Germanium, Charge (physics), Boltzmann equation, Computer Science Applications, Education, Condensed Matter::Materials Science, chemistry, Condensed Matter::Superconductivity, Ionization, Thermal, Cryogenic Dark Matter Search
Abstract

The Cryogenic Dark Matter Search (CDMS) measures both the ionized charge and the energy in athermal phonons created by particle interactions in ultrapure Ge and Si crystals at a temperature of 40 mK. Charge collection potentials must remain at only a few volts, else emitted phonons from drifted carriers will dominate the phonons of the original interaction. In this regime, there are practically no thermal phonons and carrier transport is determined by phonon emission. We present results for drift-limited carrier dynamics and rates of phonon emission. As these transport conditions represent an extreme limit, a Monte Carlo technique was used to bypass analytical assumptions commonly used in solving the Boltzmann transport equation. This work will assist us in understanding phenomena found in our detectors.

Published
2007

11. Kinetic Inductance Phonon Sensors for the Cryogenic Dark Matter Search Experiment.

Author

M. Daal, B. Sadoulet, and J. Gao

Subjects
*MATTER, *ATOMS, *DYNAMICS, *GRAVITATION
Abstract

Abstract  An important challenge faced by phonon-mediated detectors for the next generation of dark matter detectors (>100 kg) is to instrument large target mass at low cost, while maintaining the large background suppression offered by the combination of phonons and ionization (or scintillation) measurement. Kinetic inductance phonon sensors, operating far below the superconducting transition temperature, offer an interesting solution to this scaling problem. They do not critically depend on the uniformity of T c and their resonant-cavity readout is easy to multiplex. We are studying a microstrip (two parallel planes) transmission line architecture that may offer the additional advantage of a separation of functions: the main detector is just covered by an unpatterned aluminum film and the number of quasi-particles created in it by athermal phonons are sensed by a second film, which has been independently patterned and is mounted a few microns away from the detector. We present current results on the responsivity and noise of large area (∼33 mm2) microstrip kinetic inductance phonon sensors. [ABSTRACT FROM AUTHOR]

Published
2008
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12. Detectors of the Cryogenic Dark Matter Search: Charge Transport and Phonon Emission in Ge 〈100〉 Crystals at 40 mK.

Author

K. Sundqvist and B. Sadoulet

Subjects
*MATTER, *ATOMS, *DYNAMICS, *GRAVITATION
Abstract

Abstract  The Cryogenic Dark Matter Search (CDMS) measures both the ionized charge and the energy in athermal phonons created by particle interactions in ultrapure germanium and silicon crystals at a temperature of 40 mK. Charge collection potentials must remain at only a few volts, else emitted phonons from drifted carriers will dominate the phonons of the original interaction. At these drift fields, there are practically no thermal phonons and carrier transport is determined by phonon emission. We present results for drift-limited carrier dynamics and rates of phonon emission in 〈100〉 germanium. As these transport conditions represent an extreme limit, a Monte Carlo technique was used to bypass analytical assumptions commonly used in solving the Boltzmann transport equation. This work will assist us in understanding phenomena found in our detectors. [ABSTRACT FROM AUTHOR]

Published
2008
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13. Application of classical theory of electrons in gases to drift proportional chambers

Author

B. Sadoulet, V. Palladino, Palladino, Vittorio, and B., Sadoulet

Subjects
Physics, Classical theory, Argon, Physics::Instrumentation and Detectors, chemistry.chemical_element, General Medicine, Electron, Boltzmann equation, Computational physics, Magnetic field, Nuclear physics, chemistry, Diffusion (business), Image resolution
Abstract

We show that it is possible to understand both qualitatively and quantitatively, in the framework of the classical theory of electrons in gases, the behavior of drift velocities in gases commonly used in proportional drift chambers. We study in detail argon-isobutane mixtures and comment especially on the contribution of diffusion to the spatial resolution and the modification of drift velocities in magnetic fields.

Published
1975

14. Evidence for Jet Structure in Hadron Production bye+e−Annihilation

Author

R. R. Larsen, J. A. Kadyk, W. Chinowsky, V. Luth, James E Wiss, W. Tanenbaum, G. Hanson, F. Bulos, A. M. Litke, C. C. Morehouse, B. Sadoulet, M. L. Perl, Martin Breidenbach, D. Lüke, F. M. Pierre, Roy F Schwitters, D. L. Hartill, A. M. Boyarski, J. M. Paterson, Burton Richter, G. H. Trilling, G. S. Abrams, P. A. Rapidis, F. C. Winkelmann, B. Jean-Marie, C. E. Friedberg, G. J. Feldman, B. A. Lulu, D. Fryberger, J. S. Whitaker, F. Vannucci, H. L. Lynch, T. P. Pun, and G. Goldhaber

Subjects
Physics, Particle physics, Annihilation, Astrophysics::High Energy Astrophysical Phenomena, Electron–positron annihilation, Hadron, Structure (category theory), General Physics and Astronomy, Astrophysics::Cosmology and Extragalactic Astrophysics, Jet (particle physics), Nuclear physics, Angular distribution, High Energy Physics::Experiment, Production (computer science), Astrophysics::Earth and Planetary Astrophysics, Nuclear Experiment
Abstract

We have found evidence for jet structure in ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\mathrm{hadrons}$ at center-of-mass energies of 6.2 and 7.4 GeV. At 7.4 GeV the jet-axis angular distribution integrated over azimuthal angle was determined to be proportional to $1+(0.78\ifmmode\pm\else\textpm\fi{}0.12){cos}^{2}\ensuremath{\theta}$.

Published
1975

15. Observation of a Resonance at 4.4 GeV and Additional Structure near 4.1 GeV ine+e−Annihilation

Author

G. Hanson, R. R. Larsen, T. P. Pun, G. Goldhaber, P. A. Rapidis, F. C. Winkelmann, I. Peruzzi, D. L. Hartill, V. Luth, G. H. Trilling, B. Jean-Marie, F. Vannucci, H. L. Lynch, J. M. Paterson, G. J. Feldman, W. Chinowsky, C. E. Friedberg, M. Piccolo, C. C. Morehouse, R. J. Madaras, F. Bulos, F. M. Pierre, Roy F Schwitters, J. A. Jaros, M. L. Perl, A. M. Boyarski, H. K. Nguyen, J. Siegrist, J. S. Whitaker, Martin Breidenbach, Burton Richter, J. A. Kadyk, James E Wiss, D. Fryberger, B. Sadoulet, G. S. Abrams, W. Tanenbaum, and D. Lüke

Subjects
Physics, Particle physics, Electron pair, Annihilation, Meson, Hadron, General Physics and Astronomy, Elementary particle, Resonance (particle physics), Nuclear physics, Particle decay, Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment, Boson
Abstract

We observe a resonancelike structure in the total cross section for hadron production by e$sup +$e$sup -$ colliding beams at a mass of 4414 +- 7 MeV having a total width GAMMA = 33 +- 10 MeV. From the area under this resonance, we deduce the partial width to electron pairs to be GAMMA/sub ee/ = 440 +- 140 eV. Further structure of comparable width is present near 4.1 GeV. (AIP)

Published
1976

16. Determination of theGParity and Isospin ofψ(3095)by Study of Multipion Decays

Author

W. Chinowsky, G. Hanson, D. Fryberger, V. Luth, F. M. Pierre, Burton Richter, A. M. Litke, Roy F Schwitters, T. P. Pun, G. S. Abrams, J. S. Whitaker, A. M. Boyarski, G. Goldhaber, D. Lüke, F. Vannucci, J. A. Kadyk, H. L. Lynch, Martin Breidenbach, B. Sadoulet, W. Tanenbaum, R. R. Larsen, James E Wiss, F. Bulos, M. L. Perl, P. A. Rapidis, C. C. Morehouse, F. C. Winkelmann, B. Jean-Marie, D. L. Hartill, C. E. Friedberg, G. J. Feldman, B. A. Lulu, J. M. Paterson, and G. H. Trilling

Subjects
Nuclear physics, Physics, Particle physics, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Isospin, G-parity, General Physics and Astronomy, Quantum number
Abstract

We present here a measurement of six branching ratios of psi (3095) corresponding to the decays psi (3095) $Yields$rho$pi$, 2($pi$$sup +$$pi$$sup - $), 2($pi$$sup +$$pi$$sup -$)1$pi$$sup 0$, 3($pi$$sup +$$pi$$sup -$), 3($pi$$sup +$$pi$$sup -$)1$pi$$sup 0$, and 4($pi$$sup +$$pi$$sup -$)1$pi$$sup 0$. From this study, the isospin and G-parity quantum numbers are found to be I/supG/=0$sup -$. (AIP)

Published
1976

17. Behavior in magnetic field and spatial resolution of a drift chamber without electric field shaping

Author

A. Litke and B. Sadoulet

Subjects
Physics, Drift velocity, Time projection chamber, Field (physics), Physics::Instrumentation and Detectors, business.industry, General Medicine, Sense (electronics), Electron, Magnetic field, Optics, Nuclear magnetic resonance, Electric field, business, Image resolution
Abstract

We present results on the behavior in a magnetic field parallel to the sense wires and the spatial resolution of a drift chamber with relatively short drift length (7.5 mm) but without electric field shaping. This chamber operates quite well for a field as high as 15 kG, and the spatial resolution is better than ± 100 μm over the major part of the chamber for normally incident tracks. At 4 kG we give results on the spatial resolution as a function of the incident angle.

Published
1975

18. The construction of the central detector for an experiment at the CERN -p collider

Author

H. Hoffmann, C. Tao, M. Calvetti, G. Maurin, B. Sadoulet, M. Barranco Luque, A. Placci, J. Perez, M. Rijssenbeek, L. Dumps, C. Girard, L. Naumann, P. Queru, G. Piano Mortari, and C. Rubbia

Subjects
Nuclear physics, Physics, Particle physics, Large Hadron Collider, Physics::Instrumentation and Detectors, law, Detector, Physics::Accelerator Physics, General Medicine, Collider, law.invention
Abstract

The construction of a large (25 m 3 , 23 000 wires) drift chamber assembly with image readout to be used at the CERN p -p collider facility is reported. In this contribution the emphasis is mainly directed towards the mechanical and electrostatic design and on the implementation of the various control procedures.

Published
1980

19. Mesonic decays of theψ(3095)

Author

George H. Trilling, J. A. Kadyk, Martin Breidenbach, Burton Richter, T. P. Pun, V. Luth, M. Piccolo, James E Wiss, Gerson Goldhaber, M. S. Alam, P. A. Rapidis, G. J. Feldman, J. A. Jaros, J. M. Paterson, G. Hanson, F. Vannucci, I. Peruzzi, H. L. Lynch, B. Jean-Marie, H. K. Nguyen, R. J. Madaras, Frederick J. Gilman, J. S. Whitaker, B. Sadoulet, D. Lüke, R. R. Larsen, A. M. Boyarski, F. M. Pierre, C. C. Morehouse, G. S. Abrams, W. Tanenbaum, William Chinowsky, Roy F Schwitters, D. Fryberger, and C. E. Friedberg

Subjects
Nuclear physics, Physics, Particle physics, Meson, Branching fraction, Isospin, Hadron, Bound state, Mass spectrum, High Energy Physics::Experiment, Elementary particle, Nuclear Experiment, Omega
Abstract

We present branching ratios for several mesonic decay modes of the psi (3095). The two-body and quasi-two-body final states have branching ratios that follow the general pattern of behavior expected for the decay of an SU(3) singlet via an SU(3) -symmetric interaction. The ..pi../sup +/..pi../sup -/ and K/sup +/K/sup -/ mass spectra in ..omega pi pi.., ..omega..KK, phi..pi pi.., and phiKK final states show remarkable differences that are most readily interpretable in terms of the Okubo-Zweig-Iizuka rule.

Published
1977

20. Observation of the Decayψ(3684)→ψ(3095)η

Author

G. H. Trilling, D. Lüke, F. Vannucci, H. L. Lynch, R. R. Larsen, J. A. Kadyk, F. M. Pierre, D. L. Hartill, G. J. Feldman, T. P. Pun, Roy F Schwitters, G. Goldhaber, W. Chinowsky, F. Bulos, Martin Breidenbach, V. Luth, M. L. Perl, James E Wiss, B. A. Lulu, A. M. Litke, J. S. Whitaker, G. Hanson, P. A. Rapidis, F. C. Winkelmann, B. Jean-Marie, J. M. Paterson, D. Fryberger, C. C. Morehouse, C. E. Friedberg, A. M. Boyarski, G. S. Abrams, Burton Richter, B. Sadoulet, and W. Tanenbaum

Subjects
Nuclear physics, Physics, Particle physics, Meson, Branching fraction, Isospin, Hadron, Pi, G-parity, General Physics and Astronomy, High Energy Physics::Experiment, Elementary particle, Boson
Abstract

The decay psi (3684) ..-->..psi (3095) eta has been observed to have a branching fraction of (4.3+-0.8) %. This measurement, together with previous measurements of psi (3684) ..-->..psi (3095)+ anything, psi (3684) ..-->..psi (3095) ..pi../sup +/..pi../sup -/, and psi (3684) ..-->..psi (3095) ..gamma gamma.., indicates that isospin is conserved in the decay psi (3684) ..-->..psi (3095) ..pi pi.. and establishes the isospin and G parity of the psi (3684) to be I/subG/=0/sup -/. (AIP)

Published
1976

21. Observation of muonic ZO-decay at the p̄p collider

Author

B. Sadoulet, J. P. Lees, A. Astbury, Nicolas Ellis, G. Maurin, J. Timmer, C.-E. Wulz, Elizabeth Locci, J. P. Laugier, T. P. Shah, I. Sheer, J.P. Vialle, W. R. Gibson, M. Yvert, P. I. P. Kalmus, P. Cennini, G. Sajot, Michel Spiro, Felicitas Pauss, Filippo Ceradini, J. Vrana, W. G. Scott, D. Linglin, C. Bacci, P. Catz, A. Bezaguet, D. Pitman, A. Savoy-Navarro, B. Van Eijk, Alain Givernaud, G.T.J. Arnison, J. Colas, D. J. Holthuizen, G.H. Grayer, David J. Smith, T. J. V. Bowcock, L. Dobrzynski, M. Loret, A. Diciaccio, M. Corden, T. Hansl-Kozanecka, A. Orkin-Lecourtois, O. C. Allkofer, Milene Calvetti, G. Fontaine, A. Norton, M.-N. Minard, D. Dallman, D. Schinzel, J. Streets, R. J. Homer, E. Eisenhandler, J. P. Mendiburu, C. Cochet, S. Centro, E. Strauss, G. Piano Mortari, Ritva Kinnunen, Veikko Karimäki, J. Sass, M. Pimiä, P. M. Watkins, M. Demoulin, R. Frühwirth, J. Rohlf, R. Frey, Francesco Lacava, J. Garvey, D. Dau, K. Eggert, C. Roberts, Paul Kyberd, L. Paoluzi, J. D. Dowell, H. F. Hoffmann, W. Jorat, L.O. Hertzberger, K.L. Giboni, R. K. Bock, Jorma Tuominiemi, Paolo Rossi, C. Ghesquiere, Sergio Cittolin, E. Tscheslog, Michael Rijssenbeek, G. Thompson, C. Rubbia, J. P. Revol, J. Ransdell, M. Fincke, G. Bauer, L. Naumann, F. Muller, Asoke K. Nandi, H. D. Wahl, V. Vuillemin, David B. Cline, J. S. Wilson, F. Szoncso, W. Jank, Daniel Denegri, Hans Reithler, H. Lehmann, Thomas W. Markiewicz, J. Rich, A. Placci, E. Radermacher, J. P. Porte, D. DiBitonto, A. Gonidec, Dirk L. Hoffmann, A. Kernan, M. Debeer, T. J. McMahon, P. Flynn, W. Kozanecki, H. Faissner, M. Mohammadi, I. R. Kenyon, P. Erhard, B. Aubert, D. Kryn, R. Leuchs, Richard Keeler, M. Moricca, Konstanty Sumorok, W.J. Haynes, A. Lévêque, K. Morgan, G. Salvini, E. Pietarinen, Philippe Ghez, Y. Giraud-Héraud, Charling Tao, M. Della Negra, S. Geer, and A. Honma

Subjects
Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, Particle decay, Pair production, Muon, Branching fraction, Hadron, Elementary particle, Lepton
Abstract

We report the observation of five muonic Z 0 decays. The mass and cross section times branching ratio is consistent with the previous measurements of Z 0 →e + e − . Three of the muonic decays have unexpected features. One event is of the type Z 0 →μ + μ − γ. Two of the Z 0 →μ + μ − decays are accommpanied by several (>4) energetic ( E T > 10 GeV) jets which are difficult to explain within the framework of standard QCD corrections.

Published
1984

22. ψ(3684)Radiative Decays to High-Mass States

Author

D. Lüke, R. R. Larsen, G. Hanson, T. P. Pun, F. Vannucci, G. Goldhaber, James E Wiss, C. C. Morehouse, H. L. Lynch, F. M. Pierre, W. Tanenbaum, B. Sadoulet, B. A. Lulu, Roy F Schwitters, A. D. Johnson, F. Bulos, Martin Breidenbach, G. S. Abrams, Burton Richter, M. L. Perl, W. Chinowsky, V. Luth, D. L. Hartill, J. S. Whitaker, A. M. Litke, A. M. Boyarski, G. J. Feldman, C. E. Friedberg, P. A. Rapidis, F. C. Winkelmann, B. Jean-Marie, G. H. Trilling, J. A. Kadyk, and J. M. Paterson

Subjects
Physics, Nuclear physics, Angular momentum, Particle physics, Meson, Hadron, High mass, Radiative transfer, General Physics and Astronomy, Elementary particle, Parity (physics), Boson
Abstract

We present experimental evidence for the existence of the decay psi (3684) $Yields$$gamma$,chi, chi$Yields$4$pi$/sup plus-or-minus/, 6$pi$/sup plus- or-minus/, $pi$$sup +$$pi$$sup -$K$sup +$K$sup -$, $pi$$sup +$$pi$$sup -$, and K$sup +$K$sup -$. There is clear evidence for at least two chi states, one at 3.41plus-or-minus0.001 GeV/c$sup 2$ and the other at 3.53plus-or-minus0.02 GeV/ c$sup 2$. The chi (3410) decays into $pi$$pi$ and KK and thus must have even spin and parity.

Published
1975

23. K° production in e+e− annihilation

Author

R. R. Larsen, J. Dorfan, G. H. Trilling, James E Wiss, H. K. Nguyen, T. P. Pun, Rafe Schindler, Burton Richter, G. Goldhaber, W. Chinowsky, J. S. Whitaker, Martin Breidenbach, G. Hanson, A. M. Litke, F. M. Pierre, A. M. Boyarski, I. Peruzzi, F. Vannucci, J. A. Kadyk, G. S. Abrams, R. H. Schwitters, J. A. Jaros, H. L. Lynch, W. Tanenbaum, B. Sadoulet, J. M. Paterson, Ch Peyrou, M. L. Perl, M. S. Alam, P. A. Rapidis, J. L. Siegrist, R. J. Madaras, M. Piccolo, G. J. Feldman, D. Lüke, and V. Luth

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Astrophysics::High Energy Astrophysical Phenomena, Electron–positron annihilation, Nuclear Theory, Hadron, Mass spectrum, High Energy Physics::Experiment, Nuclear Experiment, Decay correct
Abstract

The production of enutral kaons in e + e − annihilation has been measured for c.m. energies between 3.4 GeV and 7.6 GeV. Near 4 GeV the inclusive K S cross section shows an increase and structure similar to total hadron production. Roughly 40–45% of all hadronic final states contain kaons, except at 4.028 GeV and 4.415 GeV, where a significantly larger kaon fraction is observed.

Published
1977

24. Experimental observation of isolated large transverse energy electrons with associated missing energy at

Author

G. Maurin, D. J. Holthuizen, G.H. Grayer, A. Bezaguet, A. Astbury, J.P. Vialle, B. Aubert, C. Hodges, Paolo Rossi, S. Centro, D. Kryn, Michel Spiro, W. G. Scott, T. Carroll, M. Demoulin, M. Yvert, H. Muirhead, Michael Rijssenbeek, Y. Giraud-Héraud, D. DiBitonto, T. Hansl-Kozanecka, A. Gonidec, K. Eggert, Phillip Gutierrez, A. Kernan, S. van der Meer, G.T.J. Arnison, G. Pianomortari, J. Saudraix, W. Jank, A. Placci, J. P. Mendiburu, K. Leuchs, P. Ghez, L. Dobrzynski, A. Di Ciaccio, J. P. Revol, M.-N. Minard, Charling Tao, M. Della Negra, A. Honma, H. F. Hoffmann, M. Debeer, D. Dallman, C. Cochet, T. J. McMahon, Jorma Tuominiemi, G. Jorat, S. Geer, J. P. Lees, I. R. Kenyon, T. J. V. Bowcock, P. Erhard, D. Schinzel, David B. Cline, Josef Strauss, Richard Keeler, C. Roberts, J. Sass, G. Salvi, M. C. Edwards, J. Timmer, M. Loret, Ritva Kinnunen, M. Pimiä, P. M. Watkins, P.I.P. Kalmus, Thomas W. Markiewicz, H. D. Wahl, V. Vuillemin, Daniel Denegri, J. Colas, G. Thompson, C. Rubbia, C. Ghesquiere, G. Bauer, M. Moricca, G. Sajot, David J. Smith, P. Cennini, C. Bacci, Konstanty Sumorok, W.R. Gibson, M. Corden, J. Vrana, J. Rich, H. Kowalski, A. Norton, J. J. Malosse, G. Salvini, Dirk L. Hoffmann, M. Calvetti, W.J. Haynes, T.P. Shah, L. Paoluzi, H. Lehmann, A. Lévêque, J. Ransdell, Sergio Cittolin, W. Kozanecki, James Rohlf, H. Faissner, E. Zurfluh, P. Catz, Asoke K. Nandi, R. Boeck, F. Szoncso, E. Tscheslog, G. Fontaine, J. Garvey, E. Eisenhandler, J. D. Dowell, R. Frey, Francesco Lacava, L.O. Hertzberger, K.L. Giboni, Filippo Ceradini, Hans Reithler, E. Radermacher, J. S. Wilson, V. Karimaeki, L. Naumann, F. Muller, D. Linglin, A. Savoy-Navarro, A. Orkin-Lecourtois, Elizabeth Locci, Y. Xie, J. P. Laugier, R. J. Homer, B. Sadoulet, Rudolf Fruehwirth, Nicolas Ellis, G. Petrucci, and Alain Givernaud

Subjects
Quark, Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Missing energy, Electron, Vector boson, law.invention, Nuclear physics, law, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, Unified field theory, Collider
Abstract

We report the results of two searches made on data recorded at the CERN SPS Proton-Antiproton Collider: one for isolated large- E T electrons, the other for large- E T neutrinos using the technique of missing transverse energy. Both searches converge to the same events, which have the signature of a two-body decay of a particle of mass ∼80 GeV/ c 2 . The topology as well as the number of events fits well the hypothesis that they are produced by the proces p + p → W ± + X , with W ± →e ± + ν ; where W ± is the Intermediate Vector Boson postulated by the unified theory of weak and electromagnetic inter- actions.

Published
1983

25. Experiments on Stochastic Cooling in ICE (Initial Cooling Experiment)

Author

T. Wikberg, H. Koziol, G. Lebée, F. Sacherer, S. van der Meer, L. Thorndahl, D. Möhl, F. Krienen, G. Carron, H. Herr, B. Sadoulet, G. Stefanini, C. Rubbia, and G. Petrucci

Subjects
Physics, Nuclear and High Energy Physics, Momentum (technical analysis), Scattering, Orders of magnitude (temperature), Mechanics, Residual, Betatron, Accelerators and Storage Rings, Acceleration, Nuclear Energy and Engineering, Control theory, Laser cooling, Stochastic cooling, Electrical and Electronic Engineering
Abstract

Recent experiments on stochastic cooling have resulted in cooling rates several orders of magnitude higher than obtained previously in the ISR. Two cooling systems reduce betatron oscillations. A third system reduces momentum spread, using the so-called filter method. The favourable signal-to-noise ratio of this method has led to cooling times (e-folding of peak density) of 15 s with 7.107 protons in ICE. Betatron cooling times are longer due to the lower signal-to-noise ratio. Simultaneous cooling in all three planes has yielded lifetimes of about 100 h, a value consistent with losses caused by single scattering on the residual gas. The existing stochastic cooling theory has been confirmed.

Published
1979

26. Experimental observation of events with large missing transverse energy accompanied by a jet or a photon (S) in p collisions at

Author

A. Astbury, B. Aubert, C.-E. Wulz, Elizabeth Locci, P. Ghez, A. Orkin-Lecourtois, J. P. Laugier, David B. Cline, W. G. Scott, A. Savoy-Navarro, J. Ransdell, K. Eggert, G. Thompson, J.P. Vialle, David J. Smith, M. Debeer, T. J. McMahon, Josef Strauss, C. Bacci, H. D. Wahl, J. Colas, M.-N. Minard, P. Catz, A. Bezaguet, I. R. Kenyon, H. Lehmann, O. C. Allkofer, D. Dallman, D. Schinzel, J. Streets, P. Cennini, I. Sheer, P. Erhard, Y. Giraud-Héraud, Hans Reithler, G.T.J. Arnison, Daniel Denegri, M. Corden, M. Loret, Felicitas Pauss, Filippo Ceradini, Thomas W. Markiewicz, Ritva Kinnunen, J. Rich, E. Radermacher, A. Norton, Alain Givernaud, J. P. Revol, J. Rohlf, W.J. Haynes, M. Pimiä, J. P. Porte, P. M. Watkins, M. Yvert, L. Dobrzynski, D. DiBitonto, R. Frühwirth, A. Diciaccio, J. Timmer, G. Piano Mortari, Veikko Karimäki, A. Gonidec, G. Jorat, A. Lévêque, H. F. Hoffmann, D. Dau, R. J. Homer, L. Paoluzi, C. Cochet, B. Sadoulet, D. J. Holthuizen, Charling Tao, G.H. Grayer, G. Fontaine, J. Garvey, A. Placci, C. Ghesquiere, J. D. Dowell, E. Pietarinen, D. Pitman, E. Eisenhandler, C. Rubbia, Sergio Cittolin, G. Maurin, R. K. Bock, M. Della Negra, B. Van Eijk, S. Geer, Jorma Tuominiemi, A. Honma, G. Bauer, E. Tscheslog, Nicolas Ellis, R. Leuchs, Richard Keeler, J. P. Lees, S. Centro, A. Kernan, Asoke K. Nandi, Paul Kyberd, F. Szoncso, M. Demoulin, P. Flynn, T. J. V. Bowcock, M. Fincke, W. Kozanecki, M. Moricca, Konstanty Sumorok, V. Vuillemin, H. Faissner, M. Mohammadi, Dirk L. Hoffmann, T. Hansl-Kozanecka, J. P. Mendiburu, P.I.P. Kalmus, M. Calvetti, T.P. Shah, R. Frey, Francesco Lacava, L.O. Hertzberger, J. Vrana, D. Kryn, D. Linglin, Paolo Rossi, Michael Rijssenbeek, J. S. Wilson, W. Jank, K. Morgan, G. Salvini, C. Roberts, L. Naumann, F. Muller, J. Sass, G. Sajot, and W.R. Gibson

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Transverse plane, Jet (fluid), Particle physics, Photon, Hadron, High Energy Physics::Experiment, Nuclear Experiment, Energy (signal processing), Standard Model
Abstract

We report the observation of five events in which a missing transverse energy larger than 40 GeV is associated with a narrow hadronic jet and of two similar events with a neutral electromagnetic cluster (either one or more closely spaced photons). We cannot find an explanation for such events in terms of backgrounds or within the expectations of the Standard Model.

Published
1984

27. Small angle elastic scattering at the CERN proton-antiproton collider

Author

C. Bacci, L. Dobrzynski, A.M. Cnops, L. Paoluzi, D. Linglin, T. Carroll, S. d'Angelo, J. Colas, Filippo Ceradini, G. Pianomortari, M. Yvert, P. Ghez, R. Leuchs, Richard Keeler, A. Orkin-Lecourtois, H. F. Hoffmann, Daniel Denegri, M. Corden, A. Bezaguet, Hans Reithler, A. Norton, Phillip Gutierrez, J. Rich, C. Roberts, Charling Tao, Sergio Cittolin, M. Della Negra, Josef Strauss, A. Honma, R. Haidan, J. S. Wilson, J. Timmer, R. Bernabei, E. Tscheslog, R. J. Homer, M. Moricca, Konstanty Sumorok, V. Karimaeki, J. Vrana, D.J. Holthuizen, R. Boeck, L. Naumann, F. Muller, R. Frey, Francesco Lacava, G.T.J. Arnison, Asoke K. Nandi, W.J. Haynes, Jorma Tuominiemi, L.O. Hertzberger, K.L. Giboni, J. Garvey, F. Szoncso, J.P. Fournier, J. D. Dowell, M. Rabany, C. Cochet, G. Fontaine, Y. Giraud-Héraud, E. Radermacher, A. Lévêque, M.-N. Minard, D. Dallman, Michael Rijssenbeek, G. Thompson, J. P. Lees, D. Schinzel, E. Eisenhandler, E. Zurfluh, A. Astbury, Ritva Kinnunen, M. Pimiä, P. M. Watkins, Alain Givernaud, M. Calvetti, T. J. V. Bowcock, T.P. Shah, W. Jank, A. Savoy-Navarro, H. D. Wahl, P. Catz, B. Sadoulet, J.P. Vialle, Elizabeth Locci, C. Rubbia, H. Lehmann, J. P. Laugier, Rudolf Fruehwirth, J. Sass, Nicolas Ellis, H. Kowalski, J. Ransdell, R. Desalvo, T. Hansl-Kozanecka, C. Hodges, J. P. Mendiburu, K. Morgan, G. Salvini, P.I.P. Kalmus, G. Maurin, W. G. Scott, B. Aubert, V. Vuillemin, D. Kryn, Michel Spiro, Thomas W. Markiewicz, G. Sajot, C. Ghesquiere, W.R. Gibson, D. Vismara, K. Eggert, M. Debeer, T. J. McMahon, S. Geer, I. R. Kenyon, G.H. Grayer, P. Erhard, G. Salvi, M. C. Edwards, S. Centro, D. DiBitonto, M. Demoulin, A. Gonidec, J. Saudraix, A. Placci, Dirk L. Hoffmann, A. Kernan, W. Kozanecki, H. Faissner, G. von Holtey, 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), UA1, and BOMBAR, Claudine

Subjects
Nuclear and High Energy Physics, Particle physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Proton, 01 natural sciences, 7. Clean energy, Exponential form, Settore FIS/04 - Fisica Nucleare e Subnucleare, law.invention, Nuclear physics, Momentum, law, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment, 010306 general physics, Collider, Physics, Elastic scattering, Range (particle radiation), Large Hadron Collider, 010308 nuclear & particles physics, Settore FIS/01 - Fisica Sperimentale, Antiproton, High Energy Physics::Experiment, Particle Physics - Experiment
Abstract

3roton-antiproton elastic scattering at cm energy 540 GeV has been studied in the t range 0.14 ⩽ − t ⩽ 0.26 GeV 2 . The data is well fitted by an exponential form exp( bt ) with b = 13.3 ± 1.5 GeV −2 .

Published
1983

28. Angular distributions and structure functions from two-jet events at the CERN SPS collider

Author

V. Vuillemin, L. Paoluzi, D. DiBitonto, M. Yvert, A. Gonidec, Richard Keeler, R. Frey, Francesco Lacava, Hans Reithler, Charling Tao, K.L. Giboni, D. Linglin, M. Moricca, Konstanty Sumorok, M. Della Negra, A. Placci, David J. Smith, C. Cochet, E. Tscheslog, E. Radermacher, Josef Strauss, K. Leuchs, D. J. Holthuizen, G.H. Grayer, P. Cennini, A. Honma, S. Centro, M. Demoulin, J. Saudraix, A. Di Ciaccio, B. Sadoulet, B. Aubert, H. F. Hoffmann, J. P. Lees, Filippo Ceradini, G.T.J. Arnison, Veikko Karimäki, S. Geer, T. J. V. Bowcock, M. Calvetti, W. Kozanecki, M. Loret, H. Faissner, T.P. Shah, A. Astbury, W.J. Haynes, Nicolas Ellis, G. Jorat, Ludwik Dobrzynski, A. Orkin-Lecourtois, G. Maurin, Ritva Kinnunen, M. Pimiä, P. M. Watkins, T. Hansl-Kozanecka, M. Rijseenbeek, C. Hodges, Y. Xie, A. Lévêque, W. G. Scott, Philippe Ghez, Daniel Denegri, J. P. Mendiburu, P. I. P. Kalmus, M. Debeer, T. J. McMahon, R. J. Homer, James Rohlf, W. Jank, G. Thompson, J. Rich, C. Rubbia, J. J. Malosse, Elizabeth Locci, E. Zurfluh, G. Bauer, L. O. Hertzberger, H. Kowalski, J. P. Revol, I. R. Kenyon, J. S. Wilson, Alain Givernaud, A. Savoy-Navarro, L. Naumann, Michel Spiro, F. Muller, J. P. Laugier, J. Garvey, P. Erhard, J. Vrana, W. R. Gibson, T. Carroll, Y. Giraud-Héraud, G. Salvi, J. D. Dowell, E. Pietarinen, J.P. Vialle, Dirk L. Hoffmann, R. K. Bock, Phillip Gutierrez, M.-N. Minard, A. Kernan, Jorma Tuominiemi, D. Dallman, J. Ransdell, Sergio Cittolin, P. Russi, D. Schinzel, J. Streets, C. Ghesquiere, H. D. Wahl, J. Sass, H. Lehmann, G. Salvini, D. Kryn, Asoke K. Nandi, F. Szoncso, Thomas W. Markiewicz, David B. Cline, R. Frühwirth, G. Sajot, K. Eggert, C. Bacci, A. Bezaguet, J. Timmer, G. Fontaine, A. Norton, E. Eisenhandler, P. Catz, Paul Kyberd, H. Muirhead, C. Roberts, J. Colas, M. Corden, and G. Piano Mortari

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Proton, Parton, Jet (particle physics), law.invention, Gluon, Nuclear physics, Cross section (physics), law, Collider
Abstract

The two-jet cross section measured in the UA1 apparatus at the CERN p p Collider has been analysed in terms of the centre-of-mass scattering angle θ and the scaled longitudinal parton momenta x1 and x2. The angular distribution dσ/d cos σ rises rapidly as cos → 1, independent of x2 and x2, as expected in vector gluon theories (QCD). The differential cross section in x1 and x2 is consistent with factorization and provides a measurement of the proton structure function F(x) = G(x) + 4 9 [Q(x) + Q (x)] at values of the four-momentum transfer squared, -t ≈ 2000 GeV2. Over the range x = 0.10−0.80 the structure function shows an exponential x dependence and may be parametrized by the form F(x) = 6.2 exp (−9.5x).

Published
1984

29. Comparison of three-jet and two-jet cross sections in pp̄ collisions at the CERN SPS pp̄ collider

Author

M. Loret, J. Colas, Philippe Ghez, J. Dorenbosch, A. Savoy-Navarro, D. Kryn, T. J. V. Bowcock, P. Erhard, P. Cennini, H. Faissner, Josef Strauss, A. Di Ciaccio, L. Dobrzynski, D. Linglin, Y. Giraud-Héraud, W.J. Haynes, B. Aubert, A. Lévêque, T. Wyatt, G. Bauer, P. Flynn, W. G. Scott, E. Radermacher, Hans Reithler, G.T.J. Arnison, T. Markiewicz, G. Jorat, G. Fontaine, I. Sheer, A. Norton, A. Orkin-Lecourtois, Charling Tao, G. Thompson, Milene Calvetti, E. Eisenhandler, D. J. Holthuizen, G.H. Grayer, J. Sass, R. Frey, Francesco Lacava, L. Paoluzi, G. Sajot, L.O. Hertzberger, E. Tscheslog, K.L. Giboni, M. Moricca, C. Bacci, M. Della Negra, Daniel J. Smith, A. Bezaguet, K. Morgan, Ritva Kinnunen, P. M. Watkins, C. Roberts, D. Pitman, S. Geer, A. Honma, M. Mohammadi, P. I. P. Kalmus, S. Centro, Sergio Cittolin, Veikko Karimäki, W. Kozanecki, M. Yvert, A. Placci, Paolo Rossi, M.J. Corden, D. Dau, M. Demoulin, R. Sobie, Michael Rijssenbeek, J. Streets, D. Hoffmann, M.-N. Minard, G. Maurin, J. Garvey, Alain Givernaud, T. Redelberger, G. Salvini, E. Buckley, P. Catz, D. Dallman, T. Hansl-Kozanecka, Asoke K. Nandi, J. P. Revol, R. Frühwirth, F. Szoncso, J. P. Porte, D. Schinzel, Jorma Tuominiemi, W. Jank, C. Cochet, L. Naumann, W. R. Gibson, W. Guryn, G. Ciapetti, A. Kernan, B. Sadoulet, J. D. Dowell, C. Rubbia, J. Vrana, J. P. Lees, L. Zanello, R. K. Bock, R. Leuchs, J. Timmer, J. P. Mendiburu, O. C. Allkofer, Nicolas Ellis, T.P. Shah, J. Rohlf, C. Ghesquiere, H. F. Hoffmann, E. Pietarinen, Daniel Denegri, J. Rich, H. D. Wahl, H. Lehmann, V. Vuillemin, Felicitas Pauss, Filippo Ceradini, R. J. Homer, David B. Cline, A. Astbury, D. DiBitonto, A. Gonidec, M. Debeer, T. J. McMahon, I. R. Kenyon, J. A. Wilson, J.P. Vialle, Richard Keeler, R. Edgecock, J. Ransdell, R. Batley, Konstanty Sumorok, M. Pimiä, C.-E. Wulz, Elizabeth Locci, J. P. Laugier, K. Eggert, G. Piano Mortari, Paul Kyberd, R. Raja, M. Fincke, and B. Van Eijk

Subjects
Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Astrophysics::High Energy Astrophysical Phenomena, Strong interaction, Bremsstrahlung, Dalitz plot, Jet (particle physics), Super Proton Synchrotron, law.invention, Nuclear physics, law, High Energy Physics::Experiment, Collider
Abstract

Results are presented on two-jet and three-jet cross sections, measured in the UA1 experiment at the CERN Super Proton Synchrotron (SPS) pp Collider, at the highest available subprocess cms energies ( s >150 GeV ). Precise measurements of the two-jet angular distribution are consistent with previous results but show significant scale-breaking effects. The three-jet Dalitz plot and the three-jet angular distributions show evidence for final- and initial-state bremsstrahlung processes, in agreement with the leading-order QCD predictions. A comparison of the yield of wide-angle three-jet events with the yield of two-jet events at smaller scattering angles gives for the strong interaction coupling constant: α s ( K 3J K 2J )=0.16±0.02±0.03 at Q2≈4000 GeV2, where the factor K 3J K 2J may plausibly be assumed to be close to unity.

Published
1985

30. Jet fragmentation into charged particles at the CERN proton-antiproton collider

Author

D. DiBitonto, B. Sadoulet, A. Gonidec, P.I.P. Kalmus, A. Placci, G.T.J. Arnison, A. Lévêque, Nicolas Ellis, R. Leuchs, Richard Keeler, G. Sajot, J. P. Lees, Jorma Tuominiemi, W.R. Gibson, A. Bezaguet, A. Astbury, T. J. V. Bowcock, Dirk L. Hoffmann, E. Zurfluh, J. Vrana, A. Orkin-Lecourtois, Ritva Kinnunen, M. Moricca, Veikko Karimäki, Elizabeth Locci, A. Savoy-Navarro, Konstanty Sumorok, M. Pimiä, P. M. Watkins, A. Kernan, M. Calvetti, J. P. Laugier, W. J. Haynes, B. Aubert, T. P. Shah, H. D. Wahl, P. Ghez, Y. Xie, J. Saudraix, H. F. Hoffmann, V. Vuillemin, Daniel Denegri, P. Kyberd, M.J. Corden, Paolo Rossi, James Rohlf, Josef Strauss, David B. Cline, A. Di Ciaccio, R. Frühwirth, G. Fontaine, H. Lehmann, J. J. Malosse, G. Thompson, D. Kryn, L. Paoluzi, Hans Reithler, M.-N. Minard, D. Dallman, M. Debeer, T. J. McMahon, E. Eisenhandler, D. Schinzel, T. Hansl-Kozanecka, G. Bauer, D. J. Holthuizen, G.H. Grayer, Michael Rijssenbeek, T. Carroll, Filippo Ceradini, S. Geer, I. R. Kenyon, E. Radermacher, W. Kozanecki, Phillip Gutierrez, S. Centro, P. Erhard, H. Faissner, J. P. Mendiburu, W. Jank, J. P. Revol, G. Salvi, J. Ransdell, H. Muirhead, M. Demoulin, J. S. Wilson, G. Salvini, R. J. Homer, J. Sass, James Rich, J. Colas, J. Timmer, J. Garvey, C. Roberts, J.P. Vialle, J. D. Dowell, E. Pietarinen, W. G. Scott, E. Tscheslog, R. K. Bock, A. Norton, Thomas W. Markiewicz, G. Piano Mortari, R. Frey, Francesco Lacava, L.O. Hertzberger, K.L. Giboni, K. Eggert, P. Catz, L. Naumann, F. Muller, D. Linglin, Charling Tao, M. Della Negra, A. Honma, Y. Giraud-Héraud, P. Cennini, C. Bacci, L. Dobrzynski, G. Jorat, C. Hodges, M. Yvert, C. Cochet, C. Rubbia, Sergio Cittolin, H. Kowalski, Alain Givernaud, Asoke K. Nandi, F. Szoncso, M. Loret, C. Ghesquiere, G. Maurin, Michel Spiro, and David J. Smith

Subjects
Physics, Quark, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Super Proton Synchrotron, Charged particle, UA1 experiment, Hadronization, Gluon, Nuclear physics, Antiproton, High Energy Physics::Experiment, Nuclear Experiment, Particle Physics - Experiment
Abstract

Inclusive fragmentation of jets into charged particles has been studied in the UA1 experiment at the CERN Super Proton Synchrotron (SPS) pp Collider at s = 540 GeV for jets having a transverse energy above 30 GeV. The observed fragmentation function is very similar to that seen in e+e−jets and is therefore indicative of similar hadronization processes for gluons and quarks. Scaling with the energy of the jet is valid to a good approximation, although slight deviations are suggested by the data. The average transverse momentum with respect to the jet axis for jets with ET > 30 GeV is 600 MeV/c for particles having z > 0.1 and increases slowly with the jet energy.

Published
1983

31. Observation of an Intermediate State inψ(3684)Radiative Cascade Decay

Author

F. M. Pierre, Roy F Schwitters, W. Tanenbaum, F. Vannucci, B. A. Lulu, A. M. Litke, H. L. Lynch, D. Fryberger, Martin Breidenbach, C. E. Friedberg, G. S. Abrams, James E Wiss, J. A. Kadyk, C. C. Morehouse, Burton Richter, J. S. Whitaker, R. R. Larsen, G. J. Feldman, B. Sadoulet, G. H. Trilling, J. M. Paterson, D. Lüke, P. A. Rapidis, F. C. Winkelmann, A. M. Boyarski, B. Jean-Marie, W. Chinowsky, V. Luth, D. L. Hartill, T. P. Pun, G. Goldhaber, F. Bulos, M. L. Perl, and G. Hanson

Subjects
Physics, Massless particle, Particle physics, Meson, Branching fraction, Hadron, General Physics and Astronomy, Intermediate state, Elementary particle, State (functional analysis), Atomic physics, Boson
Abstract

We present evidence for the existence of an intermediate state observed in the decay sequence $\ensuremath{\psi}(3684)\ensuremath{\rightarrow}\ensuremath{\psi}(3095)\ensuremath{\gamma}\ensuremath{\gamma}$. The mass of the state is either 3500 \ifmmode\pm\else\textpm\fi{} 10 or 3270 \ifmmode\pm\else\textpm\fi{} 10 MeV. The branching fraction of the sequence is (3.6 \ifmmode\pm\else\textpm\fi{} 0.7)%.

Published
1975

32. Analysis of the fragmentation properties of quark and gluon jets at the CERN SPS pp̄ collider

Author

E. Buckley, Daniel Denegri, J. Garvey, J. Rich, Sergio Cittolin, J. D. Dowell, J. P. Lees, E. Pietarinen, R. K. Bock, B. Aubert, L. Dobrzynski, Jorma Tuominiemi, A. Diciaccio, J. Dorenbosch, A. Savoy-Navarro, P. Cennini, Asoke K. Nandi, F. Szoncso, Michael Levi, G. Jorat, I. Sheer, P. Verecchia, Felicitas Pauss, K. Sumorok, W. G. Scott, Filippo Ceradini, Josef Strauss, J. Timmer, J. P. Revol, W. R. Gibson, L. Naumann, D. DiBitonto, C. Bacci, A. Bezaguet, A. Gonidec, R. Frey, Francesco Lacava, C. Perault, B. Sadoulet, D. Kryn, G. Fontaine, T. Redelberger, M. Fincke Keeler, D. J. Holthuizen, G.H. Grayer, L.O. Hertzberger, K.L. Giboni, T. Hansl-Kozanecka, A. Norton, E. Eisenhandler, C. Rubbia, M. Debeer, W.J. Haynes, T. J. McMahon, J. P. Mendiburu, R. J. Homer, W. Guryn, R. Edgecock, J. Ransdell, T. Martin, K. Eggert, I. R. Kenyon, A. Lévêque, Bruce Denby, R. Leuchs, P. Catz, T. C. Meyer, P. Erhard, S. Centro, G. Bauer, R. J. Sobie, R. Frühwirth, Nicolas Ellis, M. Yvert, D. Pitman, B. Van Eijk, D. Linglin, V. Vuillemin, O. C. Allkofer, David B. Cline, M. Demoulin, M. Calvetti, H. D. Wahl, T.P. Shah, Veikko Karimäki, K. Morgan, C. Cochet, G. Salvini, G. Sajot, G. Ciapetti, P. I. P. Kalmus, Hans Reithler, J. Rohlf, Charling Tao, Alain Givernaud, D. Dau, M. Della Negra, S. Geer, A. Honma, H. Lehmann, A. Placci, O. Meyer, C.-E. Wulz, Elizabeth Locci, J. S. Wilson, E. Radermacher, J. P. Porte, Philippe Ghez, J. P. Laugier, S. Levegrün, Y. Giraud-Héraud, T. Wyatt, G. Thompson, Paul Kyberd, Thomas W. Markiewicz, M. Markytan, H. Hofmann, J. Colas, M. Stenzler, M. Corden, G.T.J. Arnison, R. K. Keeler, Dirk L. Hoffmann, J. R. Batley, P. Flynn, Ritva Kinnunen, G. Piano Mortari, M. Pimiä, P. M. Watkins, W. Kozanecki, B. Mours, H. Faissner, A. Astbury, J. Vrana, M. Mohammadi, I. Wingerter, L. Paoluzi, L. Zanello, J.P. Vialle, A. Kernan, C. Roberts, R. Wilke, E. Tscheslog, Paolo Rossi, M. G. Albrow, Michael Rijssenbeek, M. Moricca, Th. Müller, W. Jank, David J. Smith, J. Sass, M. Goodman, C. Ghesquiere, G. Maurin, M.-N. Minard, D. Dallman, D. Schinzel, and J. Streets

Subjects
Quark, Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Hadron, UA1 experiment, Photon structure function, Gluon, Nuclear physics, High Energy Physics::Experiment, Nuclear Experiment, Scaling, Particle Physics - Experiment
Abstract

A sample of two-jet events from the UA1 experiment at the CERN pp Collider has been used to study the fragmentation of high-energy quark and gluon jets into charged hadrons. Compared with lower-energy jets observed in e + e − and pp collisions, the fragmentation function measured in the present experiment is softer (i.e. peaked to smaller values of z ) and the mean internal transverse momentum is larger, mainly because of the effects of the QCD scaling violations. Using our knowledge of the quark and gluon structure functions in the proton, together with the QCD matrix elements, a statistical separation of quark and gluon jets is achieved within the present experiment. The fragmentation function for the gluon jets is found to be softer, and the angular spread of the fragmentation products larger, than is the case for quark jets.

Published
1986

33. Observation of the muonic decay of the charged intermediate vector boson

Author

G. Arnison, A. Astbury, B. Aubert, C. Bacci, G. Bauer, A. Bézaguet, R.K. Bock, T.J.V. Bowcock, M. Calvetti, P. Catz, P. Cennini, S. Centro, F. Ceradini, S. Cittolin, D. Cline, C. Cochet, J. Colas, M. Corden, D. Dallman, D. Dau, M. DeBeer, M. Della Negra, M. Demoulin, D. Denegri, A. Di Ciaccio, D. DiBitonto, L. Dobrzynski, J.D. Dowell, K. Eggert, E. Eisenhandler, N. Ellis, P. Erhard, H. Faissner, M. Fincke, G. Fontaine, R. Frey, R. Frühwirth, J. Garvey, S. Geer, C. Ghesquière, P. Ghez, K.L. Giboni, W.R. Gibson, Y. Giraud-Héraud, A. Givernaud, A. Gonidec, G. Grayer, T. Hansl-Kozanecka, W.J. Haynes, L.O. Hertzberger, D. Hoffmann, H. Hoffmann, D.J. Holthuizen, R.J. Homer, A. Honma, W. Jank, G. Jorat, P.I.P. Kalmus, V. Karimäki, R. Keeler, I. Kenyon, A. Kernan, R. Kinnunen, W. Kozanecki, D. Kryn, F. Lacava, J.-P. Laugier, J.-P. Lees, H. Lehmann, R. Leuchs, A. Lévêque, D. Linglin, E. Locci, J.-J. Malosse, T. Markiewicz, G. Maurin, T. McMahon, J-P. Mendiburu, M.-N. Minard, M. Mohammadi, K. Morgan, M. Moricca, H. Muirhead, F. Muller, A.K. Nandi, L. Naumann, A. Norton, A. Orkin-Lecourtois, L. Paoluzi, F. Pauss, G. Piano Mortari, E. Pietarinen, M. Pimiä, A. Placci, J.P. Porte, E. Radermacher, J. Ransdell, H. Reithler, J.-P. Revol, J. Rich, M. Rijssenbeek, C. Roberts, J. Rohlf, P. Rossi, C. Rubbia, B. Sadoulet, G. Sajot, G. Salvi, G. Salvini, J. Sass, J. Saudraix, A. Savoy-Navarro, D. Schinzel, W. Scott, T.P. Shah, D. Smith, M. Spiro, J. Strauss, J. Streets, K. Sumorok, F. Szoncso, C. Tao, G. Thompson, J. Timmer, E. Tscheslog, J. Tuominiemi, B. Van Eijk, J.-P. Vialle, J. Vrana, V. Vuillemin, H.D. Wahl, P. Watkins, J. Wilson, C.-E. Wulz, Y.G. Xie, M. Yvert, and E. Zurfluh

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Muon, Physics::Instrumentation and Detectors, Branching fraction, Vector boson, Nuclear physics, Particle decay, High Energy Physics::Experiment, Invariant mass, Nuclear Experiment, Particle Physics - Experiment, Lepton, Boson
Abstract

Muons of high transverse momentum p μ T have been observed in the large drift chambers surrounding the UA1 detector at the CERN 540 GeV pp collider. For an integrated luminosity of 108 nb −1 , 14 isolated muons have been found with p T > 15 GeV/ c . They are correlated with a large imbalance in total transverse energy, and show a kinematic behaviour consistent with the muonic decay of the Intermediate Vector Boson W ± of weak interactions. The partial cross section is in agreement with previous measurements for electronic decays and with muon-electron universality. The W mass is determined to be m W = 81 +6 −7 GeV/ c 2 .

Published
1984

34. Intermediate-mass dimuon events at the CERN p collider at √s = 540 GeV

Author

H. D. Wahl, E. Tscheslog, Daniel J. Smith, D. Kryn, J. P. Mendiburu, J. P. Revol, W. Kozanecki, L. Naumann, F. Muller, P. Cennini, P. I. P. Kalmus, H. Lehmann, B. Sadoulet, Richard Keeler, D. J. Holthuizen, M. Loret, G.H. Grayer, T. J. McMahon, W. G. Scott, C. Ghesquiere, A. Savoy-Navarro, Josef Strauss, G. Fontaine, D. Linglin, Nicolas Ellis, E. Radermacher, S. Centro, G. Maurin, Philippe Ghez, Konstanty Sumorok, Paul Kyberd, A. Norton, E. Eisenhandler, J. Garvey, W. R. Gibson, M. Demoulin, J. D. Dowell, M. Pimiä, E. Pietarinen, I. R. Kenyon, J. A. Wilson, Daniel Denegri, J. P. Lees, Y. Giraud-Héraud, R. Edgecock, J. Ransdell, Alain Givernaud, J. Sass, R. K. Bock, R. Frey, Francesco Lacava, J. Rich, T. J. V. Bowcock, R. Leuchs, T. Markiewicz, L.O. Hertzberger, K.L. Giboni, R. Frühwirth, Sergio Cittolin, G. Bauer, G.T.J. Arnison, A. Orkin-Lecourtois, Charling Tao, K. Eggert, David B. Cline, Asoke K. Nandi, P. Catz, M. Moricca, M.-N. Minard, D. Dallman, J. Streets, M. Della Negra, D. Schinzel, S. Geer, A. Honma, A. Astbury, R. Raja, F. Szoncso, Ritva Kinnunen, L. Dobrzynski, Felicitas Pauss, Filippo Ceradini, G. Salvini, M. Fincke, A. Bezaguet, P. M. Watkins, W.J. Haynes, A. Kernan, V. Vuillemin, P. Erhard, J.P. Vialle, M. Calvetti, L. Paoluzi, T.P. Shah, Veikko Karimäki, M.J. Corden, T. Hansl-Kozanecka, G. Sajot, M. Yvert, J. Timmer, R. J. Homer, C.-E. Wulz, Elizabeth Locci, Hans Reithler, H. Faissner, D. Hoffmann, D. Dau, A. Lévêque, K. Morgan, D. Pitman, A. Di Ciaccio, B. Aubert, P. Flynn, J. P. Laugier, A. Placci, M. Debber, M. Mohammadi, G. Jorat, J. P. Porte, G. Thompson, B. Van Eijk, W. Guryn, C. Cochet, G. Ciapetti, Jorma Tuominiemi, J. Colas, I. Sheer, G. Piano Mortari, D. DiBitonto, A. Gonidec, C. Bacci, O. C. Allkofer, J. Rohlf, H. F. Hoffmann, T. Redelberger, Paolo Rossi, Michael Rijssenbeek, W. Jank, C. Rubbia, J. Vrana, L. Zanello, and C. Roberts

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Muon, Large Hadron Collider, Physics::Instrumentation and Detectors, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Nuclear Experiment
Abstract

We report the observation of 21 dimuon events at the CERN p p Collider with the UA1 detector. The events range in invariant dimuon mass from 2 to 22 GeV / c 2 . The properties of these events are given. The bulk of the events are consistent with heavy-flavour production (mainly b b ) with a few candidates for Drell-Yan production. There remain a few events which are difficult to interpret in terms of these processes, in particular two events with isolated, like-sign muons.

Published
1985

35. D∗ production in jets at the CERN SPS collider

Author

A. Orkin-Lecourtois, A. Kernan, Daniel Denegri, W. J. Haynes, G.T.J. Arnison, D. DiBitonto, J. Rich, A. Gonidec, R. Frey, Francesco Lacava, David J. Smith, L.O. Hertzberger, A. Savoy-Navarro, Ritva Kinnunen, David B. Cline, A. Placci, M. Pimiä, P. M. Watkins, I. Sheer, J. Sass, K. Reithler, C. Ghesquière, A. Astbury, Alain Givernaud, Veikko Karimäki, Charling Tao, D. Dau, J. P. Revol, L. Dobrzynski, M. Loret, M. Della Negra, D. J. Holthuizen, G.H. Grayer, B. Aubert, H. F. Hoffmann, Jorma Tuominiemi, A. Diciaccio, Dirk L. Hoffmann, G. Thompson, S. Geer, A. Honma, L. Paoluzi, G. Jorat, C. Bacci, B. Sadoulet, S. Centro, P. Flynn, J.P. Vialle, A. Bezaguet, G. Maurin, J. S. Wilson, E. Radermacher, J. P. Porte, W. G. Scott, C.-E. Wulz, W. Kozanecki, M. Demoulin, M. Yvert, Elizabeth Locci, Nicolas Ellis, M. Debeer, T. J. McMahon, H. Faissner, M. Mohammadi, J. P. Laugier, E. Tscheslog, J. Garvey, V. Vuillemin, I. R. Kenyon, Sergio Cittolin, P. Erhard, T. Hansl-Kozanecka, Michel Spiro, O. C. Allkofer, D. Linglin, J. Ransdell, P. Cennini, J. D. Dowell, E. Pietarinen, M. Calvetti, M.-N. Minard, J. P. Mendiburu, D. Dallman, J. P. Lees, R. K. Bock, Asoke K. Nandi, F. Szoncso, D. Schinzel, J. Streets, Y. Giraud-Héraud, T. J. V. Bowcock, C. Cochet, P. Kyberd, R. Frühwirth, J. Rohlf, K. Morgan, P.I.P. Kalmus, G. Salvini, P. Ghez, Josef Strauss, C. Rubbia, G. Bauer, Felicitas Pauss, A. Lévêque, T. P. Shah, R. Leuchs, Richard Keeler, Filippo Ceradini, D. Kryn, M. Moricca, Konstanty Sumorok, R. J. Homer, H. D. Wahl, H. Lehmann, L. Naumann, F. Muller, G. Fontaine, E. Eisenhandler, J. Timmer, P. Catz, J. Colas, M. Corden, A. Norton, G. Piano Mortari, Paolo Rossi, Michael Rijssenbeek, W. Jank, M. Fincke, Thomas W. Markiewicz, D. Pitman, B. Van Eijk, C. Roberts, K. Eggert, J. Vrana, G. Sajot, and W.R. Gibson

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Meson, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, High Energy Physics::Phenomenology, Hadron, Charged particle, Gluon, law.invention, Nuclear physics, Particle decay, Pion, law, High Energy Physics::Experiment, Nuclear Experiment, Collider
Abstract

We report evidence for the production of the charged D∗ mesons in pp collisions at s = 540 GeV . The search was confined to the charged particle fragments of hadronic jets, which are expected to be predominantly gluon jets in this experiment. The fragmentation function and production rate for D∗ in jets of average transverse momentum of 28 GeV/c are given.

Published
1984

36. Properties of anomalous eμ events produced in e+e− annihilation

Author

G. J. Feldman, A. M. Boyarski, G. Hanson, T. P. Pun, James E Wiss, Burton Richter, M. S. Alam, P. A. Rapidis, M. Piccolo, F. Bulos, G. Goldhaber, M. L. Perl, R. J. Madaras, R. R. Larsen, F. Vannucci, B. A. Lulu, F. M. Pierre, I. Peruzzi, C. E. Friedberg, W. Chinowsky, B. Sadoulet, V. Luth, Roy F Schwitters, C. C. Morehouse, Martin Breidenbach, H. K. Nguyen, D. Lüke, G. S. Abrams, J. S. Whitaker, W. Tanembaum, A. M. Litke, F. B. Heile, J. M. Paterson, G. H. Trilling, J. A. Kadyk, J. A. Jaros, and J. Dorfan

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Antiparticle, Annihilation, Missing energy, Muon, Electron–positron annihilation, High Energy Physics::Phenomenology, Charged particle, Nuclear physics, Antimatter, High Energy Physics::Experiment, Lepton
Abstract

We present the properties of 105 events of the form e + + e − → e +- + μ ∓ + missing energy, in which no other charged particles or photons are detected. The simplesthypothesis compatible with all the data is that these events come from the production of a pair of heavy leptons, the mass of the lepton being in the range 1.6 to 2.0 GeV/ c 2

Published
1976

37. Hadron production bye+e−annihilation at center-of-mass energies between 2.6 and 7.8 GeV. I. Total cross section, multiplicities, and inclusive momentum distributions

Author

W. Tanenbaum, James E Wiss, F. Vannucci, H. K. Nguyen, R. J. Hollebeek, G. S. Abrams, G. H. Trilling, H. L. Lynch, D. Fryberger, A. M. Litke, Rafe Schindler, B. Sadoulet, M. Piccolo, R. J. Madaras, R. DeVoe, D. Briggs, W. Chinowsky, G. Goldhaber, Roy F Schwitters, R. R. Larsen, J. S. Whitaker, Martin Breidenbach, F. M. Pierre, M. S. Alam, P. A. Rapidis, J. T. Dakin, C. C. Morehouse, V. Luth, D. Lyon, T. P. Pun, S. Cooper, A. D. Johnson, B. Jean-Marie, F. Bulos, C. E. Friedberg, M. L. Perl, I. Peruzzi, J. A. Jaros, J. Dorfan, J. A. Kadyk, Burton Richter, William Carithers, A. M. Boyarski, G. J. Feldman, James L. Siegrist, and G. Hanson

Subjects
Nuclear physics, Physics, Particle physics, Annihilation, Pair production, Muon, Electron–positron annihilation, Hadron, High Energy Physics::Experiment, Multiplicity (mathematics), Elementary particle, Nuclear Experiment, Lepton
Abstract

Measurements of multihadron production in e+e− annihilation at center-of-mass energies between 2.6 and 7.8 GeV are presented. Aside from the narrow resonances ψ(3095) and ψ(3684), the total hadronic cross section is found to be approximately 2.7 times the cross section for the production of muon pairs at c.m. energies below 3.7 GeV and 4.3 times the muon-pair cross section at c.m. energies above 5.5 GeV. Complicated structure is found at intermediate energies. Charged-particle multiplicities and inclusive momentum distributions are presented.

Published
1982

38. Observation ine+e−Annihilation of a Narrow State at 1865 MeV/c2Decaying toKπandKπππ

Author

W. Tanenbaum, R. DeVoe, Martin Breidenbach, G. J. Feldman, D. Lüke, James E Wiss, F. M. Pierre, A. D. Johnson, Roy F Schwitters, S. Cooper, C. C. Morehouse, D. Fryberger, M. S. Alam, J. M. Paterson, P. A. Rapidis, G. Hanson, M. L. Perl, B. Sadoulet, W. Chinowsky, R. J. Madaras, M. Piccolo, H. K. Nguyen, J. A. Jaros, F. Vannucci, W. C. Carithers, T. P. Pun, V. Luth, J. Siegrist, G. S. Abrams, J. S. Whitaker, H. L. Lynch, G. Goldhaber, R. R. Larsen, C. E. Friedberg, I. Peruzzi, Rafe Schindler, J. A. Kadyk, G. H. Trilling, J. M. Dorfan, A. M. Boyarski, and Burton Richter

Subjects
Nuclear physics, Physics, Pion, Annihilation, Meson, Electron–positron annihilation, Hadron, Mass spectrum, General Physics and Astronomy, Elementary particle, Atomic physics, Boson
Abstract

Evidence is presented, from a study of multihadronic final states produced in e/sup +/e/sup -/ annihilation at center-of-mass energies between 3.90 and 4.60 GeV, for the production of a new neutral state with mass 1865 +- 15 MeV/c/sup 2/ and decay width less than 40 MeV/c/sup 2/ that decays to K/sup plus-or-minus/..pi../sup plus-or-minus/ and K/sup plus-or-minus/..pi../sup plus-or-minus/..pi../sup plus-or-minus/..pi../sup plus-or-minus/. The recoil-mass spectrum for this state suggests that it is produced only in association with systems of comparable or larger mass. (AIP)

Published
1976

40. Study of + anything at 5.7 GeV/c

Author

S. N. Ganguli and B. Sadoulet

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Distribution (mathematics), Limit (mathematics), Flattening, Spectral line
Abstract

We present a study of the incclusive reaction p p → Λ/Σ 0 + anything at 5.7 GeV/c based on 9544 events. The main experimental feature is a flattening of the momentum-transfer distribution with the increasing missing mass. We attempt to interpret the results in the framework of the triple-Regge limit. The effective trajectory is shown to be in good agreement, within theoretical uncertainties, with what is expected from K or K∗ – K∗∗ exchanges.

Published
1973

41. Reactions at 2.5 GeV/c

Author

J. Badier, A. Bonnet, B. Sadoulet, and Ph. Briandet

Subjects
Physics, Nuclear and High Energy Physics, Angular distribution, Hydrogen, chemistry, Antiproton, Hyperon, chemistry.chemical_element, Atomic physics, Polarization (waves)
Abstract

A sample of Λ Λ, Λ Σ°, Σ °Λ has been obtained from interactions in hydrogen of antiprotons at 2.434 GeV/ c . The total and differential cross sections are given and a comparison with results at other energies is made. The polarizations and spin correlations are evaluated.

Published
1967

42. Y∗(1385) production in p reactions at 5.7 GeV/c

Author

E. Quercigh, H. Atherton, J.B. Kinson, B. Sadoulet, J. Pernegr, B. R. French, L.M. Celnikier, K. Myklebost, A. Frisk, and M.J. Clayton

Subjects
Physics, Density matrix, Nuclear and High Energy Physics, Hypercharge, Reaction mechanism, Antiproton beam, Antiproton, Bubble chamber, Production (computer science), Atomic physics
Abstract

From a bubble chamber exposure in an antiproton beam at 5.7 GeV/c yielding 13 events/μb, the final states p p → Y 1 ∗+ (1385)Λ, Y 1 ∗+ (1385)Σ + , Y 1 ∗+ (1385) Y 1 ∗+ (1385) have been isolated. We have measured the total cross section, dσ/dt, and the complete density matrix of the Y∗ for these processes. Upper limits have been set to the forbidden reactions p p → Y 1 ∗− (1385)Σ − , Y 1 ∗− (1385) Y 1 ∗− (1385) . The comparison of our results with other hypercharge reactions indicates the failure of factorisation predicted by exchange degeneracy and strongly suggests the presence of two reaction mechanisms.

Published
1971

43. Phenomenological characteristics of absorption in charge- and hypercharge-exchange reactions

Author

B. Sadoulet

Subjects
Physics, Nuclear and High Energy Physics, Hypercharge, Amplitude, Weak hypercharge, Quantum electrodynamics, Degenerate energy levels, Charge (physics), Atomic physics, Polarization (waves), Absorption (electromagnetic radiation), Symmetry (physics)
Abstract

We try to explain in a unique framework charge- and hypercharge-exchange reactions above 3 GeV/ c . Our approach is based on exchange degenerate and SU(3) symmetric Regge poles to which absorption corrections are applied. In the absence of a firm theoretical basis for these corrections we adopt the approach of fixing the Regge poles through theoretical and phenomenological considerations; we then determine what kind of absorption we should apply. At intermediate energy (around 5 GeV/ c our results indicate complete absorption of the s-wave amplitude. Of the two terms 1 and e − iπα of the Reggesignature factor, the latter should be more strongly absorbed. This effect may explain especially the breaking of line-reversal symmetry for hypercharge-exchange reactions, π − p→ π 0 n polarization data, and the difference of peripherality of ϱ − ω and A 2 −f 0 contributions. In addition, K-exchange in p p → Λ Λ has been studied.

Published
1973

44. Properties of 1mm pitch wire proportional chambers at high gain

Author

B. Sadoulet and B. Makowski

Subjects
Physics, chemistry.chemical_compound, High-gain antenna, Argon, Freon, chemistry, Isobutane, Analytical chemistry, chemistry.chemical_element, General Medicine
Abstract

We have used 1 mm pitch wire proportional chambers. We tried different mixtures of argon, isobutane, freon and methylal. We found a gas giving high amplification and standardized pulses. The properties of the chamber working in these conditions are shown and compared to chambers having different wire diameters or different pitches.

Published
1973

45. Two-body hyperon production by 5.7 GeV/c antiprotons on protons

Author

H. Atherton, L.M. Celnikier, B. Sadoulet, B. R. French, J. Pernegr, K. Myklebost, E. Quercigh, and J.B. Kinson

Subjects
Nuclear physics, Physics, Momentum, Nuclear and High Energy Physics, Cross section (physics), Antiproton, Hyperon, Production (computer science), Hydrogen bubble, Atomic physics, Polarization (waves)
Abstract

Total and differential cross sections are presented on the reactions: p p → Λ Λ, ΛΣ 0 + c.c. , Σ + Σ + at an incident momentum of 5.7 GeV/ c , from 200 000 photographs (13 events/ Σ b) of the CERN 2 metre hydrogen bubble chamber. The “forbidden” reaction p p → Σ − Σ − is also observed and its cross section is 1.3 ± 0.4 μ b. Polarization and correlation of polarizations are presented for the reaction p p → Λ Λ .

Published
1969

46. Quantum Numbers and Decay Widths of theψ(3684)

Author

V. Lüth, A. M. Boyarski, H. L. Lynch, M. Breidenbach, F. Bulos, G. J. Feldman, D. Fryberger, G. Hanson, D. L. Hartill, B. Jean-Marie, R. R. Larsen, D. Lüke, C. C. Morehouse, J. M. Paterson, M. L. Perl, T. P. Pun, P. Rapidis, B. Richter, R. F. Schwitters, W. Tanenbaum, F. Vannucci, G. S. Abrams, W. Chinowsky, C. E. Friedberg, G. Goldhaber, J. A. Kadyk, A. M. Litke, B. A. Lulu, F. M. Pierre, B. Sadoulet, G. H. Trilling, J. S. Whitaker, F. C. Winkelmann, and J. E. Wiss

Subjects
Nuclear physics, Physics, Electron–positron annihilation, General Physics and Astronomy, Quantum number, Prime (order theory)
Published
1975

47. Further evidence for charged intermediate vector bosons at the SPS collider

Author

G. Maurin, P. Ghez, D. DiBitonto, G. Sajot, A. Gonidec, A. Placci, Josef Strauss, J. P. Lees, W.R. Gibson, J. Saudraix, Veikko Karimäki, T. J. V. Bowcock, Michel Spiro, A. Di Ciaccio, D. Dau, P.I.P. Kalmus, M.-N. Minard, D. Dallman, L. Paoluzi, B. Sadoulet, D. Schinzel, J. Streets, D. Kryn, W. G. Scott, Charling Tao, W.J. Haynes, C. Bacci, A. Bezaguet, D. J. Holthuizen, G.H. Grayer, A. Lévêque, M. Della Negra, H. Muirhead, A. Honma, S. Centro, Nicolas Ellis, E. Zurfluh, M. Fincke, A. Orkin-Lecourtois, J. Colas, J. P. Revol, Y. Xie, M. Demoulin, C. Ghesquiere, C. Roberts, P. Cennini, M. Corden, G. Thompson, David J. Smith, A. Norton, E. Tscheslog, Thomas W. Markiewicz, T. Hansl-Kozanecka, Richard Wilson, Y. Giraud-Héraud, G. Piano Mortari, G.T.J. Arnison, Alain Givernaud, J. Vrana, J. P. Mendiburu, Ritva Kinnunen, M. Pimiä, P. M. Watkins, M. Calvetti, T.P. Shah, L. Dobrzynski, K. Eggert, R. Frühwirth, B. Van Eijk, Paolo Rossi, G. Jorat, J. Garvey, J. D. Dowell, E. Pietarinen, Michael Rijssenbeek, A. Savoy-Navarro, James Rohlf, R. K. Bock, W. Jank, J. Sass, J. Ransdell, Felicitas Pauss, Filippo Ceradini, Dirk L. Hoffmann, K. Morgan, G. Salvini, R. Leuchs, Richard Keeler, R. J. Homer, W. Kozanecki, H. Faissner, M. Mohammadi, B. Aubert, D. Linglin, M. Debeer, T. J. McMahon, H. D. Wahl, A. Kernan, J. S. Wilson, S. Geer, I. R. Kenyon, P. Erhard, G. Salvi, H. Lehmann, M. Moricca, C.-E. Wulz, Konstanty Sumorok, Elizabeth Locci, J. P. Laugier, R. Frey, Francesco Lacava, H. F. Hoffmann, L.O. Hertzberger, K.L. Giboni, David B. Cline, G. Fontaine, E. Eisenhandler, L. Naumann, F. Muller, Hans Reithler, J. Timmer, C. Rubbia, G. Bauer, P. Catz, E. Radermacher, J. P. Porte, M. Yvert, A. Astbury, V. Vuillemin, Jorma Tuominiemi, J.P. Vialle, Sergio Cittolin, Daniel Denegri, C. Cochet, J. Rich, Asoke K. Nandi, J. J. Malosse, F. Szoncso, and C. Hodges

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), Large Hadron Collider, Weinberg angle, Vector boson, Standard Model, law.invention, Nuclear physics, law, High Energy Physics::Experiment, Collider, Particle Physics - Experiment
Abstract

A sample of 52 Intermediate Vector Boson decays in the ( v e e) channel is described. They were produced at the CERN SPS Collider for an integrated luminosity of 0.136 pb −1 . Both production and decay properties fit well with expectations from the Standard Model of weak interactions. An improved value for the W mass is given and compared with the previously published value for the Z 0 mass.

Published
1985

48. Experimental observation of lepton pairs of invariant mass around $95 GeV/c^{2}$ at the CERN SPS collider

Author

G. Arnison, A. Astbury, B. Aubert, C. Bacci, G. Bauer, A. Bézaguet, R. Böck, T.J.V. Bowcock, M. Calvetti, P. Catz, P. Cennini, S. Centro, F. Ceradini, S. Cittolin, D. Cline, C. Cochet, J. Colas, M. Corden, D. Dallman, D. Dau, M. DeBeer, M.Della Negra, M. Demoulin, D. Denegri, A. Di Ciaccio, D. Dibitonto, L. Dobrzynski, J.D. Dowell, K. Eggert, E. Eisenhandler, N. Ellis, P. Erhard, H. Faissner, M. Fincke, G. Fontaine, R. Frey, R. Frühwirth, J. Garvey, S. Geer, C. Ghesquière, P. Ghez, K. Giboni, W.R. Gibson, Y. Giraud-Héraud, A. Givernaud, A. Gonidec, G. Grayer, T. Hansl-Kozaȧecka, W.J. Haynes, L.O. Hertzberger, C. Hodges, D. Hoffmann, H. Hoffmann, D.J. Holthuizen, R.J. Homer, A. Honma, W. Jank, G. Jorat, P.I.P. Kalmus, V. Karimäki, R. Keeler, I. Kenyon, A. Kernan, R. Kinnunen, W. Kozanecki, D. Kryn, F. Lacava, J.-P. Laugier, J.-P. Lees, H. Lehmann, R. Leuchs, A. Lévêque, D. Linglin, E. Locci, J.-J. Malosse, T. Markiewicz, G. Maurin, T. McMahon, J.-P. Mendiburu, M.-N. Minard, M. Mohammadi, M. Moricca, K. Morgan, H. Muirhead, F. Muller, A.K. Nandi, L. Naumann, A. Norton, A. Orkin-Lecourtois, L. Paoluzi, F. Pauss, G.Piano Mortari, E. Pietarinen, M. Pimiä, A. Placci, J.P. Porte, E. Radermacher, J. Ransdell, H. Reithler, J.-P. Revol, J. Rich, M. Rijssenbeek, C. Roberts, J. Rohlf, P. Rossi, C. Rubbia, B. Sadoulet, G. Sajot, G. Salvi, G. Salvini, J. Sass, J. Saudraix, A. Savoy-Navarro, D. Schinzel, W. Scott, T.P. Shah, M. Spiro, J. Strauss, J. Streets, K. Sumorok, F. Szoncso, D. Smith, C. Tao, G. Thompson, J. Timmer, E. Tscheslog, J. Touminiemi, B. Van Eijk, J.-P. Vialle, J. Vrana, V. Vuillemin, H.D. Wahl, P. Watkins, J. Wilson, C. Wulz, G.Y. Xie, M. Yvert, and E. Zurfluh

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, Settore FIS/01 - Fisica Sperimentale, Electroweak interaction, Weinberg angle, Elementary particle, Vector boson, Nuclear physics, Pair production, High Energy Physics::Experiment, Invariant mass, Particle Physics - Experiment, Lepton
Abstract

We report the observation of four electron-positron pairs and one muon pair which have the signature of a two-body decay of a particle of mass ∼ 95 GeV/c2. These events fit well the hypothesis that they are produced by the process p + p → Z 0 + X ( with Z 0 → l + + l − ) , where Z0 is the Intermediate Vector Boson postulated by the electroweak theories as the mediator of weak neutral currents.

Published
1985

49. Search for centauro like events at the CERN proton-antiproton collider

Author

Y. Giraud-Héraud, J. P. Lees, Ludwik Dobrzynski, G. Pianomortari, Charling Tao, M. Della Negra, G.T.J. Arnison, A. Honma, T. J. V. Bowcock, M.-N. Minard, C. Rubbia, B. Sadoulet, D. Dallman, D. Schinzel, J. Ciboroski, P. Ghez, M. Loret, Ritva Kinnunen, M. Pimiä, B. Aubert, P. M. Watkins, J. Saudraix, H. Kowalski, M.J. Corden, R. Frey, Francesco Lacava, L.O. Hertzberger, K.L. Giboni, L. Paoluzi, G. Maurin, A. Bezaguet, Josef Strauss, S. d'Angelo, R. Fruehwirth, Nicolas Ellis, H. Muirhead, Daniel Denegri, G.H. Grayer, A. Orkin-Lecourtois, J. Ransdell, J. Sass, H. F. Hoffmann, J. J. Malosse, Michel Spiro, S. Centro, D. DiBitonto, R. Bernabei, T. Hansl-Kozanecka, E. Tscheslog, W.J. Haynes, C. Hodges, M. Demoulin, A. Gonidec, A. Astbury, J. P. Mendiburu, Sergio Cittolin, C. Bacci, R. Haidan, M. Yvert, D.J. Holthuizen, Alain Givernaud, Elizabeth Locci, Asoke K. Nandi, A.M. Cnops, P.I.P. Kalmus, J. P. Laugier, A. Lévêque, F. Szoncso, A. Placci, M. Debeer, T. J. McMahon, E. Zurfluh, J.P. Vialle, Jorma Tuominiemi, A. Savoy-Navarro, C. Cochet, S. Geer, I. R. Kenyon, G. Salvini, P. Erhard, G. Salvi, M. C. Edwards, K. Eggert, R. Leuchs, Richard Keeler, M. Moricca, Konstanty Sumorok, Thomas W. Markiewicz, G. Sajot, W.R. Gibson, J. Colas, A. Norton, T. Carroll, Phillip Gutierrez, W. G. Scott, G. Thompson, D. Kryn, G. Fontaine, E. Eisenhandler, P. Catz, C. Chesquiere, J. Timmer, R. Boeck, J. Garvey, J. D. Dowell, Filippo Ceradini, Hans Reithler, A. Kernan, R. J. Homer, W. Kozanecki, H. Faissner, D. Linglin, Dirk L. Hoffmann, H. D. Wahl, H. Lehmann, V. Karimaeki, L. Naumann, F. Muller, E. Radermacher, J. S. Wilson, M. Calvetti, T.P. Shah, J.P. Fournier, Michael Rijssenbeek, W. Jank, J. Vrana, James Rich, C. Roberts, V. Vuillemin, 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), UA1, and BOMBAR, Claudine

Subjects
Nuclear and High Energy Physics, Particle physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Proton, Physics::Instrumentation and Detectors, Cosmic ray, 01 natural sciences, Settore FIS/04 - Fisica Nucleare e Subnucleare, law.invention, Nuclear physics, law, 0103 physical sciences, Energy spectrum, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment, 010306 general physics, Collider, Physics, Large Hadron Collider, 010308 nuclear & particles physics, Settore FIS/01 - Fisica Sperimentale, Detector, Charged particle, Antiproton, High Energy Physics::Experiment, Particle Physics - Experiment
Abstract

A search for events having the characteristics of cosmic ray Centauros has been made in 540 GeV centre of mass proton-antiproton collisions, using information on charged particle multiplicities and transverse momenta from our central detector image chamber, together with energy deposition in our calorimeters. No such events were found in 48 000 low bias events.

Published
1983

50. Search for massive eνγ and μνγ final states at the CERN super proton synchrotron collider

Author

G. Arnison, A. Astbury, B. Aubert, C. Bacci, G. Bauer, A. Bézaguet, R.K. Bock, T.J.V. Bowcock, M. Calvetti, P. Catz, P. Cennini, S. Centro, F. Ceradini, S. Cittolin, D. Cline, C. Cochet, J. Colas, M. Corden, D. Dallman, D. Dau, M. DeBeer, M. Della Negra, M. Demoulin, D. Denegri, A. Di Ciaccio, D. DiBitonto, L. Dobrzynski, J.D. Dowell, K. Eggert, E. Eisenhandler, N. Ellis, P. Erhard, H. Faissner, M. Fincke, G. Fontaine, R. Frey, R. Frühwirth, J. Garvey, S. Geer, C. Ghesquière, P. Ghez, K.L. Giboni, W.R. Gibson, Y. Giraud-Héraud, A. Givernaud, A. Gonidec, G. Grayer, T. Hansl-Kozanecka, W.J. Haynes, L.O. Hertzberger, C. Hodges, D. Hoffmann, H. Hoffmann, D.J. Holthuizen, R.J. Homer, A. Honma, W. Jank, G. Jorat, P.I.P. Kalmus, V. Karimäki, R. Keeler, I. Kenyon, A. Kernan, R. Kinnunen, W. Kozanecki, D. Kryn, F. Lacava, J.-P. Laugier, J.-P. Lees, H. Lehmann, R. Leuchs, A. Lévêque, D. Linglin, E. Locci, J.-J. Malosse, T. Markiewicz, G. Maurin, T. McMahon, J.-P. Mendiburu, M.-N. Minard, M. Mohammadi, M. Moricca, K. Morgan, H. Muirhead, F. Muller, A.K. Nandi, L. Naumann, A. Norton, A. Orkin-Lecourtois, L. Paoluzi, F. Pauss, G. Piano Mortari, E. Pietarinen, M. Pimiä, A. Placci, J.P. Porte, E. Radermacher, J. Ransdell, H. Reithler, J.-P. Revol, J. Rich, M. Rijssenbeek, C. Roberts, J. Rohlf, P. Rossi, C. Rubbia, B. Sadoulet, G. Sajot, G. Salvi, G. Salvini, J. Sass, J. Saudraix, A. Savoy-Navarro, D. Schinzel, W. Scott, T.P. Shah, D. Smith, M. Spiro, J. Strauss, J. Streets, K. Sumorok, F. Szoncso, C. Tao, G. Thompson, J. Timmer, E. Tscheslog, J. Tuominiemi, B. Van Eijk, J.-P. Vialle, J. Vrana, V. Vuillemin, H.D. Wahl, P. Watkins, J. Wilson, R. Wilson, C.-E. Wulz, Y.G. Xie, M. Yvert, and E. Zurfluh

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, Large Hadron Collider, Luminosity (scattering theory), Elementary particle, Super Proton Synchrotron, law.invention, Nuclear physics, law, Radiative transfer, Physics::Accelerator Physics, High Energy Physics::Experiment, Collider, Lepton
Abstract

The observation of an apparent excess of radiative Z 0 decays into e + e − γ and μ + μ − γ has prompted the search for massive eνγ and μνγ final states containing an energetic photon. No events were found other than those consistent with QED radiative effects in leptonic W decays. The data sample corresponds to an integrated luminosity of 0.136 pb −1 produced at the CERN super proton synchrotron (SPS) collider. An upper limit on the occurrence of such events is given.

Published
1984

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