Search

Your search keyword '"M. Willutzky"' showing total 50 results
Start Over Author "M. Willutzky"
50 results on '"M. Willutzky"'

1. NEW RESULTS FROM BHABHA SCATTERING AT 29 GEV

Author

A. A. Seidl, P. Kesten, B. B. Brabson, C. R. Ng, D.S. Koltick, N. Harnew, F. J. Loeffler, M. Derrick, B. G. Bylsma, C. K. Jung, E. H. Low, R. P. Thun, D. H. Miller, M. Willutzky, J.M. Weiss, D. Nitz, R. Debonte, G. Bonvicini, L. E. Price, D. E. Wood, H. A. Neal, S. W. Gray, D. I. Meyer, D. Errede, J. W. Chapman, J. S. Loos, L. K. Rangan, T. Trinko, P. Kooijman, K. K. Gan, Carl W. Akerlof, P. Baringer, Harold Ogren, D. Blockus, M. Valdata-Nappi, E. I. Shibata, I. Beltrami, R. L. McIlwain, S. Abachi, J. Schlereth, B. Musgrave, B. Cork, K. Sugano, and D. R. Rust

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Partial width, High Energy Physics::Experiment, Polar coordinate system, Bhabha scattering, Boson
Abstract

Results are reported on a high statistics study of Bhabha scattering at 29 GeV in the polar angle region, |cos θ| < 0.55. The data are consistent with the standard model, and measure vector and axial-vector coupling constants of gv2 = 0.03 ± 0.09 and ga2 = 0.46±0.14. Limits on the QED-cutoff parameters are Λ+ > 154 GeV and Λ- > 220 GeV. Lower limits on scale parameters of composite models are in the range 0.9-2.8 TeV. The partial width of a hypothetical spin-zero boson decaying to e+e- has an upper limit which varies from 6 to 57 MeV corresponding to a boson mass in the range 45-80 GeV/c2. © 1986.

Published
2016

2. RAPIDITY DEPENDENCE OF THE CHARGED-PARTICLE MULTIPLICITY DISTRIBUTIONS IN E+E- ANNIHILATION AT 29 GEV

Author

M. Willutzky, Harold Ogren, C. R. Ng, D. E. Wood, P. Kooijman, D. I. Meyer, R. P. Thun, B. G. Bylsma, D. H. Miller, D. R. Rust, J. Schlereth, S. W. Gray, D.S. Koltick, R. Debonte, D. Nitz, J. W. Chapman, H. A. Neal, R. L. McIlwain, S. Abachi, D. Errede, C. K. Jung, A. A. Seidl, N. Harnew, P. Kesten, B. Musgrave, F. J. Loeffler, B. Cork, Carl W. Akerlof, B. B. Brabson, K. Sugano, M. Derrick, E. H. Low, G. Bonvicini, L. E. Price, L. K. Rangan, J.M. Weiss, K. K. Gan, T. Trinko, J. S. Loos, D. Blockus, P. Baringer, I. Beltrami, M. Valdata-Nappi, and E. I. Shibata

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Spectrometer, Electron–positron annihilation, Negative binomial distribution, Multiplicity (mathematics), Rapidity, Scaling, Charged particle
Abstract

The charged particle multiplicity distribution for e+e− annihilations at s = 29 GeV has been measured using the High Resolution Spectrometer at PEP. The multiplicity distribution, expressed as a function of the mean, shows KNO scaling when compared to e+e− data at other energies. Multiplicity distributions for particles selected in different central rapidity spans are presented. All of these are well presented by the Negative binomial distribution. As the rapidity span is narrowed, the distributions become broader and approach a constant value of the parameter k.

Published
2016

3. SEARCH FOR HEAVY NEUTRAL LEPTONS IN E+E- ANNIHILATIONS AT 29 GEV

Author

U. Mallik, R. Stevens, D. Rubin, J.M. Weiss, J. S. Loos, D. R. Rust, J. P. Guillaud, H. O. Ogren, S. P. Ahlen, T. Trinko, R. L. McIlwain, L. E. Price, I. Beltrami, Robert Wilson, M. Valdata-Nappi, G. E. Forden, L. K. Rangan, E. I. Shibata, E. Fernandez, G. Baranko, B. B. Brabson, C. R. Ng, R. Fries, K. K. Gan, B. Cork, F. J. Loeffler, J. W. Chapman, D. Nitz, L. G. Hyman, S. Kooijman, M. Derrick, P. Kooijman, A. A. Seidl, L.P. Keller, D. Blockus, K. Sugano, R. Debonte, R. P. Thun, B. Musgrave, J. Va’vra, Carl W. Akerlof, H. A. Neal, N. Harnew, M. Willutzky, P. P. Ong, D. E. Wood, P. Kesten, D. I. Meyer, D. H. Miller, J. Schlereth, D. Errede, P. Baringer, S. W. Gray, D.S. Koltick, M. Daigo, and C. K. Jung

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Muon, Luminosity (scattering theory), Meson, Lepton
Abstract

A search was made in 29 GeV e+e− annihilations for heavy, neutral leptons decaying to e±X∓(ν), where X is a muon or charged meson. Six events with isolated e±X∓ pairs were found for an intergrated luminosity of 106 pb−1. The expected background is 5.5 ± 2.2 events. Limits on σ s B depend on mass and range from 8 to 20 × 10−5 nb.

Published
2016

4. Neutral K*(890) and ρ0 meson production in e+e- annihilation at ;s=29GeV

Author

D. H. Miller, J. W. Chapman, J. Schlereth, M. Willutzky, I. Beltrami, D. E. Wood, D. Errede, E. I. Shibata, M. Valdata-Nappi, M. Derrick, K. K. Gan, P. Kesten, E. H. Low, R. L. McIlwain, S. Abachi, D. R. Rust, N. Harnew, R. Debonte, R. P. Thun, J. S. Loos, B. B. Brabson, D. Blockus, H. O. Ogren, F. J. Loeffler, C. K. Jung, G. Bonvicini, L. E. Price, B. Cork, J.M. Weiss, D. I. Meyer, L. K. Rangan, S. W. Gray, B. G. Bylsma, T. Trinko, P. Kooijman, K. Sugano, B. Musgrave, P. Baringer, H. A. Neal, D. Nitz, A. A. Seidl, Carl W. Akerlof, C. R. Ng, and D.S. Koltick

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Meson, Spectrometer, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Nuclear Theory, Pseudoscalar meson, Charm quark, Nuclear physics, Momentum, High Energy Physics::Experiment, Vector meson, Nuclear Experiment, Event (particle physics)
Abstract

The production of neutral K∗(890) and ρ0 mesons was studied in e+e− annihilation at s =29 GeV using the High Resolution Spectrometer at PEP. Differential cross sections are presented as a function of the scaled energy variable z and compared to π0 and K0 production. The measured multiplicities are 0.84±0.08 ϱ0 mesons and 0.57±0.09 K ∗0 (890) mesons per event for a meson momentum greater than 725 MeV/c. The ratios of vector meson to pseudoscalar meson production for (u,d), s and c quark are compared to predictions of the Lund model.

Published
2016

5. INCLUSIVE CHARGED-PARTICLE PRODUCTION NEAR THE KINEMATIC LIMIT IN E+E- ANNIHILATION AT 29 GEV

Author

M. Derrick, D. Nitz, K. K. Gan, B. G. Bylsma, E. H. Low, D. Errede, B. Cork, C. R. Ng, D.S. Koltick, H. A. Neal, G. Bonvicini, L. E. Price, N. Harnew, L. K. Rangan, J.M. Weiss, B. B. Brabson, K. Sugano, S. W. Gray, J. W. Chapman, Harold Ogren, P. Baringer, D. R. Rust, F. J. Loeffler, P. Kesten, A. A. Seidl, C. K. Jung, T. Trinko, M. Valdata-Nappi, D. I. Meyer, I. Beltrami, P. Kooijman, R. P. Thun, E. I. Shibata, J. S. Loos, D. Blockus, R. Debonte, Carl W. Akerlof, D. H. Miller, J. Schlereth, M. Willutzky, D. E. Wood, R. L. McIlwain, S. Abachi, and B. Musgrave

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Annihilation, Spectrometer, Cluster (physics), Lund string model, High Energy Physics::Experiment, Kinematics, Limit (mathematics), Charged particle
Abstract

Inclusive production of charged particles has been studied in e+e- annihilation at ss=29 GeV using the high resolution spectrometer at PEP. Differential cross sections are presented in the range of scaled energy 0.1

Published
2016

6. COMPARISON OF LIGHT QUARK AND CHARM QUARK FRAGMENTATION

Author

B. Musgrave, C. K. Jung, D. H. Miller, J. Schlereth, M. Derrick, E. H. Low, M. Valdata-Nappi, G. Bonvicini, L. E. Price, R. Debonte, S. W. Gray, J. S. Loos, J. W. Chapman, L. K. Rangan, Harold Ogren, P. Kooijman, D. Errede, M. Willutzky, P. Baringer, C. R. Ng, D. E. Wood, N. Harnew, Carl W. Akerlof, K. K. Gan, D. I. Meyer, J.M. Weiss, R. P. Thun, B. B. Brabson, T. Trinko, R. L. McIlwain, S. Abachi, D. Blockus, I. Beltrami, E. I. Shibata, F. J. Loeffler, B. G. Bylsma, H. A. Neal, A. A. Seidl, B. Cork, K. Sugano, D. R. Rust, P. Kesten, and D. Nitz

Subjects
Quark, Physics, Nuclear and High Energy Physics, Particle physics, Top quark, Down quark, Bottom quark, Charm quark, Nuclear physics, Quark star, Up quark, High Energy Physics::Experiment, B meson, Nuclear Experiment
Abstract

Separate samples of charm quark and light quark (u, d, s) jets have been isolated in an experiment studying e+e− annihilations at s = 29 GeV . The results come from data corresponding to an integrated luminosity of 111 pb−1 collected by the High Resolution Spectrometer. Differences were observed in charged multiplicities, momentum distributions, and rapidity of the size expected from the different fragmentation functions and leading particle decay properties of the two samples.

Published
2016

7. The LAA project

Author

T. Gys, N. H. Christ, L. Cifarelli, W. Krisher, J. Gaudaen, G. Simonet, M. Suffert, F. Sauli, Val O'Shea, A. Oliva, Jasper Kirkby, S. De Pasquale, Michele Arneodo, R. Bouclier, E. Perotto, I. Crotty, Giuseppe Iacobucci, H. Leutz, Rosario Nania, R. Bertin, J. Dupraz, J. Berbiers, M. Chiarini, M. Willutzky, P. Sharp, I. Laakso, D. Scigocki, F. Palmonari, P.G. Pelfer, G. Cara Romeo, R. Wigmans, Tord Ekelof, H. P. Paar, S. Qian, T. Massam, P. Jarron, K. Goebel, K. Zographos, G. Charpak, A. E. Terraneo, F. Arzarello, S. Tailhardat, J. Schipper, T. Ypsilantis, U. Becker, R. Bock, G. Bari, L. W. Jones, G. Million, E. Colavita, P. Giusti, H. Larsen, Jean-Paul Fabre, Carmelo D'Ambrosio, M. Basile, Davide Boscherini, L. Bellagamba, K. H. Meier, E. Heijne, L. Caputi, G. C. Susinno, S. D’Auria, Federico Cindolo, M. Dardo, R. Casaccia, L. Sportelli, F. Bergsma, P. Sonderegger, P. Jenni, P. Bruni, E. Schenvit, J. Dupont, Antonino Zichichi, L. Votano, T. D. Lee, S. Hellman, J. C. Labbé, Roberto Battiston, R. Dobinson, A. Contin, R. De Salvo, H. Shönbacher, F. Frasconi, G. Laurenti, V. Peskov, M. Benot, D. Piedigrossi, J. C. Santiard, G. Sartorelli, G. Maccarrone, C. Del Papa, C. Grinnel, G. D'Alí, T. Weidberg, B. Guerard, P. Ford, C. Peroni, M. Hourican, G. Anzivino, G. Bruni, L. Lone, and C. H. Yeh

Subjects
Physics, Calorimeter (particle physics), Nuclear engineering, General Physics and Astronomy
Published
1990

8. THE LAA PROJECT

Author

Tord Ekelof, N. H. Christ, T. Gys, T. Ypsilantis, T. Massam, J. Schipper, C. Peroni, U. Becker, L. Votano, G. Bari, F. Sauli, P. Bruni, L. W. Jones, R. De Salvo, W. Krisher, E. Schenvit, L. Lone, K. Goebel, K. Zographos, G. Charpak, F. Palmonari, S. De Pasquale, J. Dupont, Jasper Kirkby, E. Perotto, R. Bertin, G. C. Susinno, M. Willutzky, A. Oliva, C. H. Yeh, Rosario Nania, J. Dupraz, F. Frasconi, P. Sharp, A. E. Terraneo, J. Berbiers, V. Peskov, I. Laakso, D. Scigocki, G. Laurenti, P.G. Pelfer, G. Cara Romeo, E. Colavita, L. Caputi, R. Dobinson, Roberto Battiston, T. Weidberg, S. Tailhardat, Jean-Paul Fabre, L. Bellagamba, Giuseppe Iacobucci, G. Million, I. Crotty, B. Guerard, P. Ford, S. Qian, M. Hourican, P. Giusti, G. Maccarrone, C. Del Papa, C. Grinnel, T. D. Lee, Carmelo D'Ambrosio, M. Basile, J. Gaudaen, G. Anzivino, G. Bruni, J. C. Labbé, Andrea Contin, G. Simonet, R. Bouclier, M. Suffert, M. Dardo, G. D'Alí, R. Casaccia, M. Benot, K. H. Meier, H. Shönbacher, P. Sonderegger, H. P. Paar, Michele Arneodo, P. Jenni, H. Larsen, J. C. Santiard, D. Piedigrossi, Val O'Shea, Saverio D'Auria, H. Leutz, P. Jarron, G. Sartorelli, M. Chiarini, L. Ciparelli, S. Hellman, F. Arzarello, Davide Boscherini, R. K. Bock, E. Heijne, F. Bergsma, Federico Cindolo, L. Sportelli, Antonino Zichichi, and R. Wigmans

Subjects
Computer science
Published
2002

9. Comparison of charged particle multiplicities in quark and gluon jets produced in e+e− annihilation at 29 GeV

Author

P. Kesten, M. Derrick, D. R. Rust, C. K. Jung, N. Harnew, D. I. Meyer, D. Nitz, D. H. Miller, D. Errede, E. H. Low, R. Debonte, J. Schlereth, M. Willutzky, R. P. Thun, P. Kooijman, D. E. Wood, C. R. Ng, F. J. Loeffler, S. W. Gray, B. G. Bylsma, R. L. McIlwain, S. Abachi, J. W. Chapman, Harold Ogren, B. Cork, B. B. Brabson, H. A. Neal, Carl W. Akerlof, K. Sugano, D.S. Koltick, M. Valdata-Nappi, B. Musgrave, P. Baringer, A. A. Seidl, J. S. Loos, J.M. Weiss, T. Trinko, G. Bonvicini, L. E. Price, L. K. Rangan, K. K. Gan, D. Blockus, I. Beltrami, and E. I. Shibata

Subjects
Quark, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Spectrometer, High Energy Physics::Lattice, Electron–positron annihilation, High Energy Physics::Phenomenology, High resolution, Jet (particle physics), Charged particle, Gluon, Nuclear physics, High Energy Physics::Experiment, Nuclear Experiment, Astrophysics::Galaxy Astrophysics
Abstract

The charged particle multiplicities of the quark and gluon jets in the three-fold symmetric e+e- → qqg events at √s = 29 GeV have been studied using the high resolution spectrometer at PEP. A value of 〈n〉g = 6.7-2.1+1.1±1.0 for gluon jet s with an energy of 9.7-2.0+1.5 GeV is measured. The ratio, 〈n〉g/〈n〉q, is 1.29-0.41+0.21±0.20, which i s significantly lower than the value of 9 4 naively expected from the ration of the gluon-to-quark color charges. © 1985.

Published
1985

10. Charm quark production and fragmentation in e+e− annihilation at 29 GeV

Author

K. K. Gan, S. Kooijman, A. A. Seidl, P. Kesten, G. Baranko, J. P. Guillaud, L. Keller, M. Derrick, D. Blockus, F. J. Loeffler, R. Fries, D. I. Meyer, S. W. Gray, P. Kooijman, Harold Ogren, D. R. Rust, N. Harnew, S. Ahlen, P. Baringer, H. A. Neal, L. E. Price, R. P. Thun, R. Stevens, J. Va'vra, R. de Bonte, L. K. Rangan, L. Hyman, David Miller, Robert Wilson, M. Valdata-Nappi, J. Chapman, C. K. Jung, I. Beltrami, C. R. Ng, B. Musgrave, B. Cork, M. Willutzky, D. Rubin, J. Schlereth, D. E. Wood, Carl W. Akerlof, U. Mallik, K. Sugano, J.M. Weiss, J. S. Loos, E. I. Shibata, T. Trinko, D. Nitz, P. P. Ong, R. L. McIlwain, G. E. Forden, E. Fernandez, B. Brabson, D.S. Koltick, M. Daigo, and D. Errede

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Spectrometer, media_common.quotation_subject, Electron–positron annihilation, Electroweak interaction, Radiation, Asymmetry, Charm quark, Nuclear physics, Fragmentation (mass spectrometry), High Energy Physics::Experiment, media_common
Abstract

The electroweak production asymmetry and the decay fragmentation function for e + e − → c c have been measured at s = 29 GeV using charged D ∗ production over the full kinematic range. The data were taken at PEP using the High Resolution Spectrometer. The measured asymmetry is −0.12 ± 0.08. The total production cross section in units of the point cross section corrected for initial state radiation is R D ∗ = 2.7 ± 0.9 .

Published
1984

11. Study of quark fragmentation ine+e−annihilation at 29 GeV: Global jet parameters and single-particle distributions

Author

M. Daigo, Robert Wilson, K. K. Gan, S. Kooijman, D.S. Koltick, H. A. Neal, D. H. Miller, P. Schreiner, R. Debonte, D. Bender, J. P. Guillaud, D. R. Rust, R. Stevens, D. Errede, D. I. Meyer, J. Schlereth, C. R. Ng, Carl W. Akerlof, P.T. Smith, D. Blockus, R. Klem, L. Keller, Harold Ogren, M. Valdata-Nappi, A. A. Seidl, P. Baringer, L. E. Price, J.M. Weiss, L. K. Rangan, F. J. Loeffler, F. Lopinto, N. Harnew, R. P. Thun, K. Jaeger, P. P. Ong, R. Singer, D. Rubin, J. Va’vra, R. Fries, G. Baranko, M. Willutzky, L. G. Hyman, S. P. Ahlen, T. Trinko, D. E. Wood, I. Beltrami, G. F. Gieraltowski, E. I. Shibata, U. Mallik, B. Cork, S. W. Gray, C. K. Jung, K. Sugano, J. S. Loos, J. W. Chapman, B. B. Brabson, M. Derrick, B. Musgrave, S. C. Ems, C. Ward, P. Kesten, P. Kooijman, D. Nitz, R. L. McIlwain, G. E. Forden, and E. Fernandez

Subjects
Quantum chromodynamics, Physics, Quark, Nuclear physics, Particle physics, Annihilation, Electron–positron annihilation, Isospin, Quark model, Hadron, Elementary particle
Abstract

In this paper, results are presented from a study of the hadronic final states in e/sup +/e/sup -/ annihilation at 29 GeV. The data were obtained with the High Resolution Spectrometer (HRS) at the SLAC PEP e/sup +/e/sup -/ colliding-beam facility. The results are based on 6342 selected events corresponding to an integrated luminosity of 19.6 pb/sup -1/. The distributions of the events in sphericity (S), thrust (T), and aplanarity (A) are given and compared to other e/sup +/e/sup -/ data in the same energy range. We measure = 0.130 +- 0.003 +- 0.010 and = 0.100 +- 0.002. The sphericity distribution is compared to sphericity measurements made for beam jets in hadronic collisions as well as jets studied in neutrino scattering. The data sample is further reduced to 4371 events with the two-jet selections, S< or =0.25 and A< or =0.1. The single-particle distributions in the longitudinal and transverse directions are given. For low values of the momentum fraction (z = 2p/W), the invariant distribution shows a maximum at zapprox.0.06, consistent with a QCD expectation. The data at high Feynman x (x/sub F/) show distribution consistent with being dominated by a (1-x/sub f/)/sup 2/ variation for themore » leading quark-meson transition. The rapidity distribution shows a shallow central minimum with a height (1/N/sub e//sub v/dN/sup h//dYVertical Bar= 0 = 2.3 +- 0.02 +- 0.07.« less Authors: Bender, D. ; Derrick, M. ; Fernandez, E. ; Fries, R. ; Gieraltowski, G. ; Hyman, L. ; Jaeger, K. ; Klem, R. ; Kooijman, P. ; Loos, J.S. ; LoPinto, F. ; Musgrave, B. ; Price, L.E. ; Schlereth, J. ; Schreiner, P. ; Singer, R. ; Sugano, K. ; Trinko, T. ; Valdata-Nappi, M. ; Ward, C. more »; Weiss, J.M. ; Ahlen, S. ; Baranko, G. ; Baringer, P. ; Blockus, D. ; Brabson, B. ; Daigo, M. ; Ems, S. ; Forden, G.E. ; Gray, S.W. ; Guillaud, J. ; Jung, C. ; Neal, H. ; Ogren, H. ; Rust, D. ; Smith, P. ; Akerlof, C. ; Chapman, J. ; Errede, D. ; Harnew, N. ; Kesten, P. ; Kooijman, S. ; Meyer, D.I. ; Nitz, D. ; Rubin, D. ; Seidl, A.A. ; Thun, R. ; Willutzky, M. ; Beltrami, I. ; DeBonte, R. ; Gan, K.K. ; Koltick, D. ; Loeffler, F. ; Mallik, U. ; McIlwain, R. ; Miller, D.H. ; Ng, C.R. ; Ong, P.P. ; Rangan, L.K. ; Shibata, E.I. ; Stevens, R. ; Wilson, R.J. ; Wood, D.E. ; Cork, B. ; Keller, L. ; Va'vra, J. « less Publication Date:1985-01-01 OSTI Identifier:6247594 Resource Type:Journal Article Resource Relation:Journal Name: Phys. Rev. D; (United States); Journal Volume: 31:1 Research Org:Argonne National Laboratory, Argonne, Illinois 60439 Country of Publication:United States Language:English Subject: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; HADRONS; ISOSPIN; MASS; QUARKS; EIGENSTATES; FLAVOR MODEL; QUANTUM CHROMODYNAMICS; S WAVES; SPIN; SU-3 GROUPS; SYMMETRY BREAKING; ANGULAR MOMENTUM; COMPOSITE MODELS; ELEMENTARY PARTICLES; FIELD THEORIES; LIE GROUPS; MATHEMATICAL MODELS; PARTIAL WAVES; PARTICLE MODELS; PARTICLE PROPERTIES; POSTULATED PARTICLES; QUANTUM FIELD THEORY; QUARK MODEL; SU GROUPS; SYMMETRY GROUPS 645204* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Strong Interactions & Properties

Published
1985

12. Hadron production ine+e−annihilation at√s =29GeV

Author

L. Keller, D. R. Rust, P. P. Ong, D. Blockus, Harold Ogren, G. Bonvicini, L. E. Price, and R. J. Wilson, D. I. Meyer, B. G. Bylsma, L. K. Rangan, D. Rubin, R. L. McIlwain, S. Abachi, G. E. Forden, E. Fernandez, D. H. Miller, Carl W. Akerlof, N. Harnew, D.S. Koltick, B. B. Brabson, A. A. Seidl, E. I. Shibata, K. K. Gan, H. A. Neal, M. Daigo, D. Errede, R. P. Thun, S. Kooijman, S. W. Gray, J. Schlereth, M. Derrick, J. W. Chapman, J. Va’vra, F. J. Loeffler, B. Musgrave, E. H. Low, G. Baranko, C. K. Jung, B. Cork, K. Sugano, P. Kesten, R. de Bonte, D. Nitz, P. Baringer, M. Valdata-Nappi, R. Fries, L. G. Hyman, M. Willutzky, D. E. Wood, J. S. Loos, C. R. Ng, P. Kooijman, I. Beltrami, U. Mallik, J.M. Weiss, and T. Trinko

Subjects
Physics, Particle physics, Pion, Meson, Branching fraction, Electron–positron annihilation, Hadron, Quark model, Elementary particle, Lambda baryon
Abstract

Data from the High Resolution Spectrometer at the SLAC storage ring PEP have been used to study the inclusive production of baryons and mesons. Time-of-flight measurements are used to identify the charged hadrons. Neutral hadrons are identified from effective-mass peaks associated with their decay into two charged particles. Cross sections and other inclusive production characteristics are presented for ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$, ${K}^{\ifmmode\pm\else\textpm\fi{}}$, and ${K}^{0}$ (K${\ifmmode\bar\else\textasciimacron\fi{}}^{0}$) mesons, and for the baryons (antibaryons) p (p\ifmmode\bar\else\textasciimacron\fi{}) and \ensuremath{\Lambda} (\ensuremath{\Lambda}\ifmmode\bar\else\textasciimacron\fi{}). The ratio of the inclusive cross section to the point cross section for the ${K}^{0}$ and K${\ifmmode\bar\else\textasciimacron\fi{}}^{0}$ mesons is R(${K}^{0}$,K${\ifmmode\bar\else\textasciimacron\fi{}}^{0}$)=6.15\ifmmode\pm\else\textpm\fi{}0.13\ifmmode\pm\else\textpm\fi{}0.25, and for \ensuremath{\Lambda} and \ensuremath{\Lambda}\ifmmode\bar\else\textasciimacron\fi{}, R(\ensuremath{\Lambda},\ensuremath{\Lambda}\ifmmode\bar\else\textasciimacron\fi{})=0.846\ifmmode\pm\else\textpm\fi{}0.036\ifmmode\pm\else\textpm\fi{}0.085. The neutral-hadron differential cross sections are compared with the predictions of the Lund string model.

Published
1987

13. Production ofφandF(1970)→φπine+e−Annihilation at 29 GeV

Author

M. Derrick, E. Fernandez, R. Fries, L. Hyman, P. Kooijman, J. S. Loos, B. Musgrave, L. E. Price, J. Schlereth, K. Sugano, J. M. Weiss, D. E. Wood, G. Baranko, P. Baringer, D. Blockus, B. Brabson, C. E. Forden, S. W. Gray, C. Jung, H. Neal, H. Ogren, D. R. Rust, M. Valdata-Nappi, C. Akerlof, G. Bonvicini, J. Chapman, D. Errede, N. Harnew, P. Kesten, S. Kooijman, D. I. Meyer, D. Nitz, D. Rubin, A. A. Seidl, R. Thun, T. Trinko, M. Willutzky, I. Beltrami, B. G. Bylsma, R. DeBonte, D. Koltick, K. K. Gan, F. J. Loeffler, E. H. Low, U. Mallik, R. L. McIlwain, D. H. Miller, C. R. Ng, P. P. Ong, L. K. Rangan, E. I. Shibata, R. J. Wilson, B. Cork, L. Keller, and J. Va'vra

Subjects
Physics, Particle physics, Annihilation, Meson, Branching fraction, Electron–positron annihilation, Hadron, General Physics and Astronomy, Elementary particle, Nuclear physics, Pion, Mass spectrum, High Energy Physics::Experiment, Nuclear Experiment
Abstract

Data from the high-resolution spectrometer at PEP have been used to study the inclusive production of phi mesons and F/sup + -/ mesons decaying into phi..pi../sup + -/. Fragmentation functions and cross sections are presented and compared to existing data. The total phi cross section at 29 GeV is 40 +- 6 pb. The observed F signal in the region z>0.4, given the assumption that R(F)/(R(F)+R(D)) = 0.15, corresponds to an F..-->..phi..pi.. branching ratio of (3.3 +- 1.1)%. The measured F mass is 1963 +- 3 +- 3 MeV/c/sup 2/.

Published
1985

14. Precision test of QED by direct comparison of e+e− → γγ and e+e− → e+e− at 29 GeV

Author

K. K. Gan, R. P. Thun, M. Valdata-Nappi, D. H. Miller, Carl W. Akerlof, H. A. Neal, B. Cork, D. Errede, J. Schlereth, C. R. Ng, B. Musgrave, H. O. Ogren, P. Baringer, K. Sugano, G. Bonvicini, L. E. Price, D. Nitz, N. Harnew, L. K. Rangan, J. W. Chapman, D. Blockus, J. S. Loos, P. Kesten, A. A. Seidl, D.S. Koltick, F. J. Loeffler, J.M. Weiss, D. I. Meyer, D. R. Rust, C. K. Jung, T. Trinko, S. W. Gray, P. Kooijman, R. Debonte, R. L. McIlwain, I. Beltrami, S. Abachi, E. I. Shibata, B. B. Brabson, M. Willutzky, M. Derrick, D. E. Wood, E. H. Low, and B. G. Bylsma

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Astrophysics::High Energy Astrophysical Phenomena, Electron–positron annihilation, High Energy Physics::Experiment, Polar coordinate system, Nuclear Experiment
Abstract

The ratio of differential cross sections for the reactions e+e− → γγ and e+e− → e+e− is measured at s = 29 GeV in the central polar angle region, |cos θ| 59 GeV and Λ- > 59 GeV.

Published
1986

15. InclusiveD0andD+Production ine+e−Annihilation at 29 GeV

Author

L. E. Price, U. Mallik, L. K. Rangan, J.M. Weiss, M. Derrick, D. Nitz, T. Trinko, J. Va'vra, P. Kesten, D. Blockus, K. K. Gan, S. Kooijman, M. Willutzky, B. Cork, Robert Wilson, P. P. Ong, C. K. Jung, D. E. Wood, N. Harnew, C. R. Ng, J. P. Guilluad, S. W. Gray, D. I. Meyer, R. Stevens, R. Fries, R. P. Thun, G. Baranko, S. P. Ahlen, I. Beltrami, L. G. Hyman, E. I. Shibata, F. J. Loeffler, Harold Ogren, P. Baringer, K. Sugano, Carl W. Akerlof, D. Rubin, M. Valdata-Nappi, J. S. Loos, D. R. Rust, A. A. Seidl, H. A. Neal, Jeremy R. Chapman, R. Debonte, B. Musgrave, L. Keller, B. Brabson, D. Errede, R. L. McIlwain, G. E. Forden, E. Fernandez, M. Daigo, D.S. Koltick, D. H. Miller, J. Schlereth, and P. Kooijman

Subjects
Quark, Nuclear physics, Physics, Particle physics, Annihilation, Meson, media_common.quotation_subject, General Physics and Astronomy, Charge (physics), Production (computer science), Asymmetry, media_common
Abstract

We have observed inclusive production of D0 and D+ mesons, and their charge conjugates, in e+e− annihilation at 29 GeV on the basis of a data sample of 106 pb−1. These signals correspond to R values of R(D0+D―0)=1.8±0.5 and R(D++D−)=1.2±0.4. Taking the D+ and D0 data together, we measure a charge asymmetry of A=−0.08±0.12 for charmed quarks. A comparison of R(D+D―) with R(D*+D―*) obtained via the process D*+→D0π+ gives a DD* ratio of 1.0−0.2+0.3, indicating that direct D* production dominates over direct D production.

Published
1984

16. Measurement of the reaction e+e− → τ+τ− at √s = 29 GeV

Author

F. J. Loeffler, B. G. Bylsma, Robert Wilson, N. Harnew, S. W. Gray, C. K. Jung, A. A. Seidl, P. Baringer, B. Musgrave, H. A. Neal, B. Cork, C. R. Ng, J. S. Loos, D. Rubin, R. Fries, M. Willutzky, M. Derrick, J. W. Chapman, P. Kesten, L. G. Hyman, E. H. Low, D.S. Koltick, D. E. Wood, R. L. McIlwain, K. Sugano, G. E. Forden, E. Fernandez, R. Debonte, D. I. Meyer, D. R. Rust, P. Kooijman, B. B. Brabson, G. Baranko, D. Nitz, M. Valdata-Nappi, J. Va’vra, R. P. Thun, K. K. Gan, S. Kooijman, L.P. Keller, H. O. Ogren, G. Bonvicini, L. E. Price, Carl W. Akerlof, L. K. Rangan, P. P. Ong, D. Errede, D. H. Miller, I. Beltrami, J. Schlereth, E. I. Shibata, D. Blockus, J.M. Weiss, and T. Trinko

Subjects
Coupling, Physics, Nuclear and High Energy Physics, Particle physics, Spectrometer, media_common.quotation_subject, Electroweak interaction, High resolution, Asymmetry, Standard Model, Nuclear physics, Angular distribution, Cutoff, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, media_common
Abstract

The reaction e+e- → τ+τ- has been measured using the high resolution spectrometer at PEP. The angular distribution shows a forward-backward asymmetry of -(6.1±2.3±0.5)%, corresponding to an axial-vector coupling if gaτgae = 0.28 ±0.11± 0.03, in good agreement with the standard model of electroweak interactions. The measured cross section yields ifRττ = 1.10± 0.03±0.04, consistent with QED and giving QED cutoff parameters of Λ+>92 GeV and Λ->246 GeV at 95% C.L. © 1985.

Published
1985

17. InclusiveDandD*Production ine+e−Annihilation at 29 GeV

Author

S. Ahlen, C. Akerlof, G. Baranko, P. Baringer, I. Beltrami, D. Bender, D. Blockus, B. Brabson, J. Chapman, Y. Cho, S. T. Chui, B. Cork, R. DeBonte, M. Derrick, S. Ems, D. Errede, E. Fernandez, G. E. Forden, R. Fries, K. K. Gan, G. Gieraltowski, S. W. Gray, J. -P. Guillaud, N. Harnew, L. Hyman, K. Jaeger, L. Keller, P. Kesten, R. Klem, D. Koltick, P. Kooijman, S. Kooijman, F. Loeffler, J. S. Loos, F. LoPinto, U. Mallik, R. McIlwain, D. I. Meyer, D. H. Miller, B. Musgrave, H. Neal, C. R. Ng, D. Nitz, H. Ogren, P. P. Ong, L. E. Price, L. K. Rangan, D. Rubin, D. Rust, J. Schlereth, P. Schreiner, A. A. Seidl, E. I. Shibata, R. Singer, P. Smith, R. Stevens, R. Thun, T. Trinko, M. Valdata-Nappi, J. Va'vra, L. T. Wang, C. Ward, J. M. Weiss, M. Willutzky, R. J. Wilson, and D. E. Wood

Subjects
Nuclear physics, Physics, Annihilation, Pion, Meson, Branching fraction, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Hadron, Analytical chemistry, General Physics and Astronomy
Abstract

Inclusive production of (D/sup 0/,D-bar /sup 0/) and D/sup + -/ mesons has been observed in e/sup +/e/sup -/ annihilation at 29 GeV. The signals correspond to R values of R(D/sup 0/+D /sup 0/) = 3.25 +- 1.2 and R(D/sup +/+D/sup -/) = 1.35 +- 0.6. D/sup asteriskplus-or-minus/ production is also observed via the process D/sup asterisk+/..-->..D/sup 0/..pi../sup +/ and its charge conjugate. The D and D( production rates are compared.

Published
1983

18. Study of quark fragmentation ine+e−annihilation at 29 GeV: Charged-particle multiplicity and single-particle rapidity distributions

Author

D. Errede, K. K. Gan, B. Musgrave, S. W. Gray, J. W. Chapman, Harold Ogren, E. I. Shibata, Carl W. Akerlof, M. Willutzky, J. S. Loos, N. Harnew, M. Valdata-Nappi, C. R. Ng, R. L. McIlwain, G. Bonvicini, L. E. Price, S. Abachi, L. K. Rangan, H. A. Neal, R. Debonte, P. Kooijman, D. E. Wood, F. J. Loeffler, B. B. Brabson, P. Baringer, B. G. Bylsma, D. H. Miller, M. Derrick, E. H. Low, D. Nitz, P. Kesten, J. Repond, J. Schlereth, D. R. Rust, B. Cork, D. I. Meyer, K. Sugano, R. P. Thun, C. K. Jung, G. Baranko, A. A. Seidl, D. Blockus, U. Mallik, J.M. Weiss, T. Trinko, I. Beltrami, and J. M. Brom

Subjects
Nuclear physics, Physics, Particle physics, Annihilation, Hadron, Multiplicity (mathematics), Rapidity, Elementary particle, Inelastic scattering, Charged particle, Sphericity
Abstract

This paper presents the charged-particle multiplicity distributions for e/sup +/e/sup -/ annihilation at ..sqrt..s = 29 GeV measured in the High Resolution Spectrometer. The data, which correspond to an integrated luminosity of 185 pb/sup -1/, were obtained at the SLAC e/sup +/e/sup -/ storage ring PEP. The techniques used to correct the observed prong numbers are discussed. The multiplicity distribution of the charged particles has a mean value = 12.87 +- 0.03 +- 0.30, a dispersion D/sub 2/ = 3.67 +- 0.02 +- 0.18, and an f/sub 2/ moment of 0.60 +- 0.02 +- 0.18. Results are also presented for a two-jet sample selected with low sphericity and aplanarity. The charged-particle distributions are almost Poissonian and narrower than have been reported by other e/sup +/e/sup -/ experiments in this energy range. The mean multiplicity increases with the event sphericity, and for the sample of threefold-symmetric three-jet events, a value of = 16.3 +- 0.3 +- 0.7 is found. No correlation is observed between the multiplicities in the two hemispheres when the events are divided into two jets by a plane perpendicular to the thrust axis. This result is in contrast with the situation in soft hadronic collisions, where a strongmore » forward-backward correlation is measured. For the single jets, a mean multiplicity of 6.43 +- 0.02 +- 0.15 and a dispersion value of D/sub 2/ = 2.55 +- 0.02 +- 0.13 are found. These values give further support to the idea of independent jet fragmentation. The multiplicity distributions are well fit by the negative-binomial distribution.« less

Published
1986

19. Observation of Tensor and Scalar Mesons Produced ine+e−Annihilation at 29 GeV

Author

D. H. Miller, P. Kooijman, M. Derrick, D. R. Rust, H. O. Ogren, C. K. Jung, E. H. Low, D. Blockus, D. Errede, L. E. Price, Carl W. Akerlof, D. Nitz, L. K. Rangan, M. Willutzky, F. J. Loeffler, B. G. Bylsma, Jose Repond, R. P. Thun, P. Baringer, J.M. Weiss, B. Musgrave, K. K. Gan, A. A. Seidl, J. S. Loos, J. M. Brom, C. R. Ng, R. Debonte, P. Kesten, J. W. Chapman, B. Cork, E. I. Shibata, K. Sugano, B. B. Brabson, D. E. Wood, R. L. McIlwain, S. Abachi, D. I. Meyer, and D.S. Koltick

Subjects
Quark, Physics, Particle physics, Annihilation, Meson, Electron–positron annihilation, High Energy Physics::Phenomenology, Nuclear Theory, Hadron, General Physics and Astronomy, Nuclear physics, Pair production, Pion, High Energy Physics::Experiment, Nuclear Experiment, Scalar meson
Abstract

The production of the tensor mesons f/sup 0/(1270) and K/sup *//sup 0/(1430) and the scalar meson S(975) have been observed in e/sup +/e/sup -/ annihilation at 29 GeV center-of-mass energy, by use of data obtained with the High-Resolution Spectrometer at the storage ring SLAC e/sup +/e/sup -/ PEP. The mean multiplicities for meson momenta greater than 1450 MeV/c are = 0.11 +- 0.04, = 0.10 +- 0.0 6, and = 0.05 +- 0.02 per hadronic event. The fragmentation functions of the tensor mesons are in good agreement with the predictions of the Webber cluster model. The data are consistent with a predominant strange-quark content of the S meson.

Published
1986

20. Asymmetry in the angular distribution of inclusive ∧ baryons from e+e− annihilations at GeV

Author

J.M. Weiss, B. Cork, R. P. Thun, K. Sugano, B. B. Brabson, A. A. Seidl, D. R. Rust, C. K. Jung, Carl W. Akerlof, R. L. McIlwain, S. Abachi, Jose Repond, J. S. Loos, M. Derrick, D. H. Miller, D. Blockus, E. H. Low, P. Kesten, P. Kooijman, B. Musgrave, P. Baringer, J. W. Chapman, D. I. Meyer, E. I. Shibata, D.S. Koltick, D. Nitz, F. J. Loeffler, B. G. Bylsma, H. A. Neal, K. K. Gan, J. M. Brom, H. O. Ogren, L. E. Price, L. K. Rangan, R. Debonte, M. Willutzky, D. E. Wood, C. R. Ng, and D. Errede

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, media_common.quotation_subject, Hadron, Hyperon, Elementary particle, Fermion, Lambda baryon, Asymmetry, Baryon, Nuclear physics, High Energy Physics::Experiment, media_common
Abstract

A forward-backward asymmetry A, consistent with that expected from the γ−Z0 interference term in the process e + e − → q q , is observed in the laboratory production angular distribution of high-momentum ∧ baryons. The data were collected with the High Resolution Spectrometer at PEP. The asymmetry for ∧ baryons with fractional energy z= 2E s greater than 0.3 is A = (−23± 8plusmn; 2)%.

Published
1986

21. Dilepton and trilepton production by neutrinos in Gargamelle at CERN SPS energies

Author

J.M. Olsen, M. Willutzky, K. Myklebost, P. Petitjean, A. Haatuft, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and Heyd, Yvette

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Gargamelle, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Neutrino, Super Proton Synchrotron, Particle Physics - Experiment
Abstract

We report on a search for ν μ N → μ − e − X and ν μ N → μ − e + e − X events in Gargamelle at CERN Super Proton Synchrotron (SPS) energies. Ten μ − e − events were found with p e − > 0.5 GeV/ c and p μ − > 4.5 GeV/ c (seven of these events have p e − > 0.8 GeV/ c ). The rate relative to the charged-current events is (6.7 ± 3.9) × 10 −4 , and to the opposite-sign dileptons 0.20 ± 0.11. Some characteristics of the μ − e − events are compared with μ − e + and charged-current events. Three ν μ N → μ − e + e − X events were observed with p e ± > 0.3 GeV/ c , p μ − > 4.5 GeV/ c , and m e + e − > m π 0 . The rate of these events relative to the charged-current events is (3.1 ± 1.9) × 10 −4 .

Published
1983

22. Observation of an excess of ν e , ν e events in a beam dump experiment at 400 GeV

Author

G. Bonneaud, R. Arnold, G. Carnesecchi, J. Gillespie, W. Van Doninck, J.P. Vialle, C. Matteuzzi, T. W. Jones, Alberto Pullia, M. Willutzky, N. Armenise, P. Alibran, A. Blondel, C. Pascaud, O. Skjeggesta, J. H. Bartley, B. Degrange, J. Sleeman, P. Musset, M. Haguenauer, G. Conforto, S. Bonetti, A.M. Lutz, S. Nuzzo, U. Nguyen-Khac, Ph. Heusse, D. Bertrand, R. Blaes, O. Erriquez, M. Dewit, H. Burmeister, B. Pattison, J. Morfin, S. Natali, P. Petitjean, L. Welch, E. Fiorini, M. J. Price, T. Bolognese, M. Paty, H. Weerts, A. G. Frodesen, M. T. Muciaccia-Fogli, J. Sacton, Donatella Cavalli, F. Jacquet, M. Rollier, B. Escoubes, D. Blum, J. L. Rieter, J. Bourotte, F. W. Bullock, A. Rognebakke, E. Bellotti, F. Romano, and L. Zanotti

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Neutral current, Branching fraction, lcsh:QC1-999, law.invention, Nuclear physics, law, Gargamelle, Antimatter, Physics::Accelerator Physics, High Energy Physics::Experiment, Beam dump, Neutrino, lcsh:Physics, Charged current, Lepton
Abstract

A beam dump experiment has been performed at CERN in Gargamelle using the neutrino facility to look for penetrating particles produced either directly in the beam interaction or by prompt decay of new particles. A total of 32 interactions with a visible energy greater than 10 GeV has been found, classified, aftercorrections, into 18 charged current ν μ or ν μ , 5.1 neutral current and 8.9 ν e or ν e charged current events. An excess of ν e events remains after all subtractions from any established sources. Results are presented in terms of the product of the cross section and the leptonic decay branching ratio of the possible source.

Published
1978

23. New results on the reactione+e−→μ+μ−at√s =29GeV

Author

H. A. Neal, R. Debonte, K. K. Gan, S. Kooijman, D. Nitz, I. Beltrami, D. I. Meyer, D. Errede, R. Fries, M. Derrick, E. I. Shibata, L. G. Hyman, U. Mallik, P. Kesten, B. B. Brabson, M. Valdata-Nappi, J. S. Loos, R. P. Thun, Carl W. Akerlof, R. Stevens, J.M. Weiss, L. E. Price, Robert Wilson, L. K. Rangan, D. Rubin, T. Trinko, C. R. Ng, N. Harnew, L. Keller, S. P. Ahlen, C. K. Jung, M. Willutzky, D. H. Miller, R. L. McIlwain, D. Blockus, B. Musgrave, P. Kooijman, G. E. Forden, E. Fernandez, D. E. Wood, F. J. Loeffler, J. Schlereth, S. W. Gray, J. W. Chapman, Harold Ogren, P. Baringer, B. Cork, K. Sugano, D. R. Rust, M. Daigo, D.S. Koltick, G. Baranko, J. Va’vra, J. P. Guillaud, A. A. Seidl, and P. P. Ong

Subjects
Nuclear physics, Physics, Angular range, Muon, Pair production, Annihilation, Branching fraction, High resolution, High Energy Physics::Experiment, Nuclear Experiment, Bar (unit)
Abstract

We have measured the processe/sup +/e/sup -/..--> mu../sup +/..mu../sup -/ at ..sqrt..s = 29 GeV using the High Resolution Spectrometer at SLAC PEP. The forward-backward charge asymmetry is A/sub mumu/ = -(4.9 +- 1.5 +- 0.5)% based on 5057 events. A subsample of 3488 ..mu../sup +/..mu../sup -/ events in the angular range Vertical BarcosthetaVertical Bar 170 GeV and ..lambda../sub -/>146 GeV at 95% C.L.

Published
1985

24. Experimental limits on monojet production in e+e− annihilation at 29 GeV

Author

P. Kesten, D. Nitz, D. Errede, G. Baranko, D. H. Miller, M. Valdata-Nappi, G. Bonvicini, L. E. Price, J. Schlereth, M. Willutzky, L. K. Rangan, D. Blockus, J. S. Loos, R. Debonte, R. Fries, D. E. Wood, B. B. Brabson, L. G. Hyman, Robert Wilson, U. Mallik, S. W. Gray, K. K. Gan, S. Kooijman, J. W. Chapman, A. A. Seidl, F. J. Loeffler, C. R. Ng, J.M. Weiss, Carl W. Akerlof, J. Va'vra, N. Harnew, M. Derrick, P. Kooijman, B. Cork, Harold Ogren, P. Baringer, E. H. Low, D. Rubin, L. Keller, D.S. Koltick, T. Trinko, R. L. McIlwain, G. E. Forden, E. Fernandez, K. Sugano, B. G. Bylsma, D. R. Rust, I. Beltrami, E. I. Shibata, D. I. Meyer, H. A. Neal, R. P. Thun, C. K. Jung, P. P. Ong, and B. Musgrave

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Astrophysics::High Energy Astrophysical Phenomena, Theoretical models, Production (computer science), Jet (particle physics), Event (particle physics), Unobservable, Luminosity
Abstract

A search was made for e + e − →X 1 X 2 where X 1 consists of one or more light unobservable particles and X 2 decays promptly to a visible jet of particles. One event was found for an integrated luminosity of 176 pb −1 , a rate consistent with known backgrounds. This result places a significant constraint on a number of theoretical models.

Published
1985

25. Experimental study of the reactionse+e−→e+e−ande+e−→γγ at 29 GeV

Author

B. Musgrave, B. Cork, K. Sugano, H. A. Neal, R. Debonte, N. Harnew, K. K. Gan, P. Kooijman, M. Willutzky, B. B. Brabson, F. J. Loeffler, P. Baringer, J. Schlereth, B. G. Bylsma, R. L. McIlwain, D. E. Wood, R. P. Thun, S. Abachi, E. I. Shibata, D.S. Koltick, A. A. Seidl, D. H. Miller, M. Valdata-Nappi, D. I. Meyer, Carl W. Akerlof, G. Bonvicini, L. E. Price, J. S. Loos, L. K. Rangan, S. W. Gray, M. Derrick, J. W. Chapman, E. H. Low, Harold Ogren, D. Blockus, C. K. Jung, I. Beltrami, U. Mallik, J.M. Weiss, D. R. Rust, T. Trinko, D. Errede, P. Kesten, C. R. Ng, and D. Nitz

Subjects
Physics, Elastic scattering, Particle physics, Annihilation, Scattering, Astrophysics::High Energy Astrophysical Phenomena, Electron–positron annihilation, Elementary particle, Nuclear physics, Pair production, High Energy Physics::Experiment, Nuclear Experiment, Bhabha scattering, Boson
Abstract

This paper reports measurements of the differential cross sections for the reactions e/sup +/e/sup -/..-->..e/sup +/e/sup -/ (Bhabha scattering) and e/sup +/e/sup -/..--> gamma gamma.. (..gamma..-pair production). The reactions are studied at a center-of-mass energy of 29 GeV and in the polar-angular region chemically bond costheta chemically bond 154 GeV and ..lambda../sub -/>220 GeV for Bhabha scattering, and ..lambda../sub +/>59 GeV and ..lambda../sub -/>59 GeV for ..gamma..-pair production.

Published
1986

26. ΛProduction ine+e−Annihilations at 29 GeV: A Comparison with Lund-Model Predictions

Author

H. A. Neal, D. Blockus, R. Debonte, K. K. Gan, J. M. Brom, E. I. Shibata, M. Willutzky, J.M. Weiss, D. I. Meyer, D. R. Rust, M. Daigo, J. P. Guillaud, T. Trinko, R. L. McIlwain, S. Abachi, Carl W. Akerlof, B. Cork, F. J. Loeffler, H. O. Ogren, D. Errede, J. Schlereth, D. E. Wood, G. Bonvicini, L. E. Price, L. K. Rangan, K. Sugano, N. Harnew, D. H. Miller, D.S. Koltick, R. P. Thun, A. A. Seidl, B. Musgrave, M. Derrick, E. H. Low, S. W. Gray, C. K. Jung, B. B. Brabson, D. Nitz, P. Kesten, Ben Bylsma, J. W. Chapman, M. Valdata-Nappi, C. R. Ng, P. Baringer, J. S. Loos, P. Kooijman, and I. Beltrami

Subjects
Physics, Nuclear physics, Baryon, Diquark, Particle physics, Branching fraction, Electron–positron annihilation, Hadron, Hyperon, General Physics and Astronomy, Lambda, Lambda baryon
Abstract

This paper presents measurements of the inclusive production cross sections of ..lambda.. baryons in e/sup +/e/sup -/ annihilations at ..sqrt..s = 29 GeV. The data sample corresponds to an integrated luminosity of 256 pb/sup -1/ collected with the High-Resolution Spectrometer at the SLAC storage ring PEP. Comparisons are made to the predictions of the Lund model. The data are well described with use of a strange diquark suppression parameter, (us/ud)/(s/d), of 0.89 +- 0.10/sub -0.16//sup +0.56/, and the measured ..lambda../sub c/..--> lambda..+X branching ratio of (23 +- 10%).

Published
1986

27. LVD at Gran Sasso

Author

Andrea Contin, F. Grianti, A. S. Malguin, Beat Jeckelmann, E. Perotto, P. Salvadori, G. Landi, Q. Q. Zhu, M. Basile, C. Jing, A. Castelvetri, S. Qian, W.R. Sheldon, O. G. Ryazhskaya, V. O'Shea, H.H. Kuang, Luisa Cifarelli, G. Cara Romeo, F. Rohrbach, G. Ji, I. A. Pless, P. Galeotti, C. Morello, M. Widgoff, C. Aglietta, G. Jing, Rosario Nania, G. Cini, F. Palmonari, G.L. Susino, A. Pitas, L. Bergamasco, G. H. Mo, E. S. Hafen, P. Diodati, G. Bruni, G. Confronto, J. H. Moromisato, M. Willutzky, P. Picchi, M. Dardo, A. Rindi, D. Shambroom, J.A. Chincellato, P. Shen, V. G. Ryassny, F. Artemi, A. Turtelli, S. De Pasquale, Kaushik De, L. Periale, G. Navarra, A. Zallo, V. P. Talochkin, Z. Lu, V.S. Berezinski, Anderson Fauth, Elena Korolkova, Giuseppe Iacobucci, G. Badino, G.E. Kocharov, Roy Weinstein, O. Saavedra, A.M. Shapiro, J. Pyrlik, V. B. Kortchaguin, F. Vetrano, V. L. Dadykin, F. Lipps, W. Fulgione, G. D'Ali, P. Caputi, T. Massam, P. Vallania, C. Cappelletti, S. Vernetto, D. Alyea, M. Deutsch, Lawrence S. Pinsky, A. Spallone, V. F. Yakushev, P. Rotelli, C. Dobrigkeit Chincellato, Stefano Bianco, Kwong Lau, I. Laakso, P. Giusti, P. V. Kortchaguin, D. Sanders, M. Enorini, G. Di Sciascio, E. Saletan, G.C. Trinchero, Y. Yuan, C. Bari, Gabriella Sartorelli, R. Casaccia, G. T. Zatsepin, E. von Goeler, G. Maccarrone, C. Del Papa, L. Votano, Fabrizio Fabbri, R. Scrimaglio, Antonella Castellina, F. F. Khalchukov, P. Haridas, L. Din, G. Prisco, Carlotta Castagnoli, Y. Dai, C.Z. Zhao, G. Anzivino, Antonino Zichichi, Giuseppe Barbagli, V. A. Kudryavtsev, B. Mayes, Behcet Alpat, P.G. Pelfer, F. Cindolo, and M. A. Markov

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Solar neutrino, Particle detector, scintillator, Nuclear physics, cosmic rays, Neutrino detector, Measurements of neutrino speed, High Energy Physics::Experiment, Neutrino, Large Volume Detector, Neutrino oscillation, Instrumentation
Abstract

LVD is a large volume detector which will be installed in Hall A of the Gran Sasso Laboratory. This detector is 49 m long, 13.2 m high and 12 m wide. It contains 2280 m3 of scintillator (1800 t) and 1800 t of steel. The geometric acceptance of LVD for an isotropic flux of particles is greater than 7000 m2 sr. LVD is the ideal detector for detecting a stellar collapse, anywhere in our galaxy; for studying neutrino oscillations; for searching for the supersymmetric decay mode of the proton; and for looking at the boron neutrinos from the sun. LVD is a very competitive detector for detecting astrophysical neutrino emitting point sources, for performing dark matter searches, for studying single muon distributions, for detecting muon bundles and hence determining the primary cosmic ray composition, and for searching for massive monopoles and other ultra heavy particles. LVD is composed of 190 identical modules, of which the first 10% of these modules will installed in 1987.

Published
1988

28. New results on charmed and beautiful baryon production at the ISR

Author

G. Anzivino, G. Sartorelli, G. Cara Romeo, Antonino Zichichi, L. Cifarelli, S. De Pasquale, G. D'Alí, G. Maccarrone, M. Willutzky, Andrea Contin, G. Iacobucci, C. Del Papa, E. Perotto, Giancarlo Susinno, L. Casaccia, Lucia Votano, P. Rotelli, G. Bari, I. Laakso, M. Basile, G. Prisco, Luisa Cifarelli, T. Massam, F. Palmonari, P. Giusti, R. Nania, and F. Cindolo

Subjects
Physics, Nuclear physics, Baryon, Nuclear and High Energy Physics, Particle physics, Hadron, Production (computer science), Charm (quantum number), Atomic and Molecular Physics, and Optics
Abstract

The production of heavy flavouredbaryons, Λ c + and Λ b 0 has been studied in pp interactions at the ISR. Both baryons are observed in the forward region, for x F ≥ 0.35. The results confirm the heavy baryon production to be governed by the “leading hadron” effect. The cross-section for ( D Λ c + ) associated production has been estimated with various hypotheses concerning the possible charm production mechanisms. A preliminary cross-section value is also given for ( B Λ b 0 ) production.

Published
1988

29. The large-volume detector (LVD) - a multipurpose underground detector at Gran Sasso

Author

Gabriella Sartorelli, R. Casaccia, Carlotta Castagnoli, E. Perotto, P. Salvadori, R. Scrimaglio, E. von Goeler, C. Dobrigkeit-Chincellato, J.A. Chincellato, C. Jing, Beat Jeckelmann, M. Defelice, V. P. Talochkin, O. Saavedra, A.S. Markov, Y. Dai, P. Vallania, D. Shambroom, W.R. Sheldon, L. Votano, A. Spallone, G. Navarra, M. Widgoff, G. D'Ali, G. Conforto, F.F. Khaichukov, F. Rohrbach, F. Palmonari, O. G. Ryazhskaya, D. Alyea, I. A. Pless, P. Galeotti, Giuseppe Iacobucci, G. Landi, T. Hara, Rosario Nania, G. Cini, V. F. Yakushev, T. Massam, Fabrizio Fabbri, G. Cara Romeo, C.Z. Zhao, F. Vetrano, Stefano Bianco, J. H. Moromisato, P. Rotelli, Isao Yamamoto, Lawrence Pinsky, V. Vasileyev, Giancarlo Susinno, G. Anzivino, F. Grianti, M. Deutsch, F. Artemi, Giuseppe Barbagli, M. Dardo, A. Zallo, Antonino Zichichi, Akeo Misaki, P. Giusti, P. V. Kortchaguin, V. S. Berezinsky, P. Diodati, Anderson Fauth, P. Picchi, G. Maccarrone, A. Turtelli, Kaushik De, Antonella Castellina, C. Del Papa, Y. Sun, M. Willutzky, B. Mayes, V. A. Kudryavtsev, M. Aryal, P. Shen, P.G. Pelfer, P. Haridas, A. Pitas, V. G. Ryassny, T. Kitamura, L. Caputi, Roy Weinstein, G. H. Mo, L. Din, C.S. Mao, Nobusuke Takahashi, Behcet Alpat, Q. Q. Zhu, A. Castelvetri, G. T. Zatsepin, M. Basile, G. Badino, C. Morello, E. Saletan, C. Aglietta, G. Jing, S. Vernetto, Y. Dong, G. Bari, G.C. Trinchero, S. Qian, G.E. Kocharov, J. Pyrlik, E. S. Hafen, V. B. Kortchaguin, S. De Pasquale, M. Italiani, Elena Korolkova, Y.R. Wu, Y. Yuan, V. L. Dadykin, Y. Minorikawa, L. Periale, Piera Luisa Ghia, Andrea Contin, Tomonori Wada, Z. Shi, V. O'Shea, Luisa Cifarelli, A.M. Shapiro, G. Ji, G. Bruni, Kwong Lau, Z. Lu, F. Lipps, S. Wang, W. Fulgione, D. Sanders, H.H. Huang, M. Enorini, G. Di Sciascio, I. Laakso, F. Cindolo, L. Bergamasco, and N. Inoue

Subjects
Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Detector, Astrophysics::Instrumentation and Methods for Astrophysics, Cosmic ray, Nuclear physics, Neutrino detector, Observatory, Measurements of neutrino speed, High Energy Physics::Experiment, Neutrino astronomy, Neutrino, Large Volume Detector, Instrumentation
Abstract

The large-volume detector (LVD) which will be installed in Hall A of the Gran Sasso Laboratory can be defined as an underground observatory devoted to neutrino astronomy and to the measurement of the penetrating components of cosmic rays. The detector consists of two major parts: the tracking system and the scintillator system. It is specifically designed to permit a multipurpose experiment allowing the detection of neutrino interaction inside the detector and the detection of omnidirectional mu-mesons and the measurement of their trajectories and direction of flight.

Published
1989

30. Search for neutrino oscillations in 'Gargamelle' at SPS

Author

C. Matteuzzi, M.T. Fogli-Muciaccia, G. Carnesecchi, Ph. Heusse, Donatella Cavalli, F. Romano, M. Willutzky, S. Ragazzi, M. Rollier, N. Armenise, A. Pullia, C. Pascaud, M. Haguenauer, J.P. Vialle, and S. Bonetti

Subjects
Nuclear physics, Physics, Massless particle, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Gargamelle, Elementary particle, Fermion, Neutrino, Neutrino oscillation, Particle Physics - Experiment, Lepton
Abstract

The ν events collected in “Gargamelle” exposed at the CERN SPS wide band beam are reanalyzed to search for possible ν μ → ν e oscillations. No effect is found and an upper limit of 1.2 eV at 68% c.l. is determined for the mass parameters Δm = (m 1 2 − m 2 2 ) 1 2 in the case of maximum neutrino mixing. A limit on the ν μ → ν τ transition probability is also quoted, but the sensitivity is smaller.

Published
1981

31. High energy elastic numu scattering off electrons in Gargamelle

Author

P. Alibran, L. Zanotti, G. Carnesecchi, A.M. Lutz, A. Blondel, M. Willutzky, E. Fiorini, M. J. Price, Ph. Heusse, C. Pascaud, A. Pullia, P. Lundborg, J. Sleeman, M.T. Fogli-Muciaccia, C. Matteuzzi, O. Erriquez, M. Haguenauer, B. Pattison, Salvatore Nuzzo, J. Gillespie, S. Natali, F. Romano, F. Jacquet, J.P. Vialle, U. Nguyen-Khac, S. Bonetti, J. Bourotte, B. Degrange, E. Bellotti, G. Bonneaud, P. Musset, D. Blum, N. Armenise, Donatella Cavalli, M. Rollier, and C. Arnault

Subjects
Nuclear physics, Elastic scattering, Physics, Nuclear and High Energy Physics, Particle physics, Neutral current, Gargamelle, Bubble chamber, Elementary particle, Neutrino, Charged current, Particle Physics - Experiment, Lepton
Abstract

The reaction nu /sub mu /e to nu /sub mu /e has been investigated in the bubble chamber Gargamelle exposed to the wide-band neutrino beam of the CERN SPS. Nine electron candidates of which 0.5 are expected to be background, were found in a total statistics available of 64000 charged current neutrino events. Results are given in terms of vector and axial vector coupling constants. The present results agree with the standard SU(2)(X)U(1) model for current values of sin/sup 2/ Theta /sub w/. A critical comparison is made with the previous result based on statistics which were smaller by a factor 2.6 and which led to a rather higher cross section. (10 refs).

Published
1979

32. Measurement of the topological branching fractions of the tau lepton

Author

Robert Wilson, H. O. Ogren, M. Valdata-Nappi, G. Bonvicini, L. E. Price, L. K. Rangan, C. R. Ng, B. Musgrave, R. P. Thun, E. Fernandez, D. Nitz, K. K. Gan, C. K. Jung, N. Harnew, S. Kooijman, J. Va’vra, I. Beltrami, E. I. Shibata, P. Kesten, A. A. Seidl, B. B. Brabson, M. Willutzky, J.M. Weiss, M. Derrick, D. E. Wood, S. W. Gray, T. Trinko, E. H. Low, R. L. McIlwain, D. R. Rust, P. P. Ong, Carl W. Akerlof, F. J. Loeffler, G. E. Forden, G. Baranko, D. Blockus, B. G. Bylsma, D. Errede, L. Keller, B. Cork, D. H. Miller, J. Schlereth, K. Sugano, H. A. Neal, R. Debonte, D. Rubin, D. I. Meyer, D.S. Koltick, J. S. Loos, R. Fries, J. W. Chapman, L. G. Hyman, Philip Baringer, and P. Kooijman

Subjects
Nuclear physics, Elastic scattering, Physics, Particle physics, Spectrometer, Branching fraction, General Physics and Astronomy, Elementary particle, High Energy Physics::Experiment, Fermion, Charged particle, Bhabha scattering, Lepton
Abstract

We report new and precise measurements of the decay branching fractions of the tau lepton to one and three charged particles. The data, corresponding to an integrated luminosity of 176 pb/sup -1/, were collected by the High Resolution Spectrometer at the e/sup +/e/sup -/ storage ring PEP at SLAC operated at ..sqrt..s = 29 GeV. The fractions of tau decays into one and three charged particles are 0.869 +- 0.002 +- 0.003 and 0.130 +- 0.002 +- 0.003, respectively.

Published
1985

33. Measurement of the F-meson lifetime

Author

Ben Bylsma, D. H. Miller, M. Valdata-Nappi, P. Kesten, J. W. Chapman, E. I. Shibata, B. Cork, D. Blockus, P. Baringer, D. Errede, K. Sugano, J. P. Guillaud, H. O. Ogren, C. Jung, H. A. Neal, B. B. Brabson, J.M. Weiss, D. R. Rust, R. P. Thun, Jose Repond, M. Derrick, F. J. Loeffler, R. Debonte, G. Bonvicini, L. E. Price, M. Willutzky, C. R. Ng, T. Trinko, E. H. Low, S. W. Gray, L. K. Rangan, D. E. Wood, D. Nitz, I. Beltrami, K. K. Gan, P. Kooijman, B. Musgrave, J. S. Loos, N. Harnew, D. I. Meyer, J. Schlereth, J. M. Brom, R. L. McIlwain, S. Abachi, Carl W. Akerlof, and D.S. Koltick

Subjects
Physics, Statistics::Theory, Particle physics, Annihilation, Statistics::Applications, Meson, Cabibbo–Kobayashi–Maskawa matrix, Hadron, General Physics and Astronomy, Elementary particle, Particle decay, Pion, High Energy Physics::Experiment, Boson
Abstract

We report a measurement of the lifetime of the ${\mathit{B}}^{0}$ meson based upon 29-GeV ${\mathit{e}}^{+}$${\mathit{e}}^{\mathrm{\ensuremath{-}}}$ annihilation data taken with the Mark II detector at the SLAC storage ring PEP. The ${\mathit{B}}^{0}$ mesons are tagged by their decays into ${\mathit{D}}^{\mathrm{*}\mathrm{\ensuremath{-}}}$${\mathit{e}}^{+}$\ensuremath{\nu} and ${\mathit{D}}^{\mathrm{*}\mathrm{\ensuremath{-}}}$${\mathrm{\ensuremath{\mu}}}^{+}$\ensuremath{\nu}, where the ${\mathit{D}}^{\mathrm{*}\mathrm{\ensuremath{-}}}$ is tagged by its decay into ${\mathrm{\ensuremath{\pi}}}^{\mathrm{\ensuremath{-}}}$D\ifmmode\bar\else\textasciimacron\fi{} $^{0}$. We reconstruct the decay vertices of 15 ${\mathit{B}}^{0}$-meson candidates and measure the ${\mathit{B}}^{0}$ lifetime to be 1.${20}_{\mathrm{\ensuremath{-}}0.360.14}^{+0.52+0.16}$ psec.

Published
1986

34. A Modified Time Expansion Chamber as a Vertex Detector

Author

Rosario Nania, Luisa Cifarelli, E. Perotto, G. Laurenti, G. Cara Romeo, Giuseppe Iacobucci, F. Palmonari, R. Casaccia, Andrea Contin, M. Basile, Giancarlo Susinno, Federico Cindolo, F. Motta, T. Massam, G. D'Alí, S. De Pasquale, M. Willutzky, G. Sartorelli, Guido di Prisco, Antonino Zichichi, G. Maccarrone, C. Del Papa, G. Bari, and L. Votano

Subjects
Physics, Nuclear physics, Drift velocity, ZEUS (particle detector), Physics::Instrumentation and Detectors, Expansion chamber, Electric field, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Vertex detector, HERA, Image resolution
Abstract

The design presented is one of two proposals for a Vertex Detector for the experiment ZEUS at HERA.

Published
1988

35. Observation and study of the nu$_{mu}$e- --> nu$_{mu}$e- reaction in Gargamelle at high energy

Author

D. Blum, J. Sleeman, C. Matteuzzi, F. Romano, Salvatore Nuzzo, N. Armenise, L. Zanotti, Donatella Cavalli, M. Rollier, M. Haguenauer, P. Lundborg, J. Bourotte, P. Alibran, Ph. Heusse, E. Bellotti, B. Pattison, M.T. Fogli-Muciaccia, B. Degrange, S. Natali, O. Erriquez, F. Jacquet, A. Pullia, U. Nguyen-Khac, A.M. Lutz, G. Bonneaud, P. Musset, E. Fiorini, G. Conforto, C. Pascaud, J. Gillespie, J.P. Vialle, G. Carnesecchi, M. Willutzky, S. Bonetti, and A. Blondel

Subjects
Physics, Nuclear physics, Elastic scattering, Coupling constant, Nuclear and High Energy Physics, Gargamelle, Bubble chamber, Elementary particle, Neutrino, Nuclear Experiment, Pseudovector, Particle Physics - Experiment, Lepton
Abstract

A search for the reaction nu /sub mu /+e/sup -/ to nu /sub mu /+e/sup -/ was made in the bubble chamber Gargamelle exposed to the wide- and neutrino beam of the CERN-SPS. Ten isolated e/sup -/ were found above 2 GeV energy. All of them were emitted at an angle smaller than 1.5 degrees with respect to the beam. The background is 0.2+or-0.2 events. Results on cross section are given in terms of vector and axial vector coupling constants. A comparison is made with the standard SU(2)(X)U (1) model: no agreement is found with the currently accepted value of the mixing angle. Possible sources other than the above reaction are discussed. (10 refs).

Published
1978

36. TESTS OF QED AT 29 GEV CENTER-OF-MASS ENERGY

Author

Harold Ogren, P. Baringer, M. Willutzky, J.M. Weiss, D. I. Meyer, A. A. Seidl, M. Valdata-Nappi, D. E. Wood, B. Cork, R. Singer, L. E. Price, Robert Wilson, G. F. Gieraltowski, L. Keller, T. Trinko, S. Kooijman, R. P. Thun, P. Schreiner, L. K. Rangan, H. A. Neal, D. Nitz, K. Jaeger, P. P. Ong, F. Lopinto, D. Errede, D. Bender, C. R. Ng, R. Stevens, K. K. Gan, B. Brabson, G. Baranko, D. Rubin, S. W. Gray, R. Klem, J. Va’vra, P.T. Smith, P. Kesten, L. G. Hyman, R. de Bonte, J. P. Guillaud, S. P. Ahlen, D. Blockus, B. Musgrave, R. L. McIlwain, U. Mallik, I. Beltrami, S. C. Ems, F. J. Loeffler, G. E. Forden, D. H. Miller, Carl W. Akerlof, E. Fernandez, E. I. Shibata, R. Fries, M. Derrick, J. Schlereth, C. Ward, N. Harnew, P. Kooijman, J. S. Loos, D. R. Rust, Jeremy R. Chapman, and D.S. Koltick

Subjects
Nuclear physics, Physics, Particle physics, Pair production, Muon, Order (ring theory), Elementary particle, Production (computer science), High Energy Physics::Experiment, Energy (signal processing), Bhabha scattering, Lepton
Abstract

During the initial data run with the High Resolution Spectrometer (HRS) at SLAC PEP, an integrated luminosity of 19.6 p${\mathrm{b}}^{\ensuremath{-}1}$ at a center-of-mass energy of 29 GeV was accumulated. The data on Bhabha scattering and muon pair production are compared with the predictions of QED and the standard model of electroweak interactions. The measured forward-backward charge asymmetry in the angular distribution of muon pairs is -8.4%\ifmmode\pm\else\textpm\fi{}4.3%. A comparison between the data and theoretical predictions places limits on alternative descriptions of leptons and their interactions. The existence of heavy electronlike or photonlike objects that alter the structure of the QED vertices or modify the propagator are studied in terms of the QED cutoff parameters. The Bhabha-scattering results give a lower limit on a massive photon and upper limits on the effective size of the electron of ${\ensuremath{\Lambda}}_{+}g121$ GeV and ${\ensuremath{\Lambda}}_{\ensuremath{-}}g118$ GeV at the 95% confidence level. Muon pair production yields ${\ensuremath{\Lambda}}_{+}g172$ GeV and ${\ensuremath{\Lambda}}_{\ensuremath{-}}g172$ GeV. If electrons have substructure, the magnitude and character of the couplings of the leptonic constituents affects the Bhabha-scattering angular distributions to such an extent that limits on the order of a TeV can be extracted on the effective interaction length of the components. For models in which the constituents interact with vector couplings of strength $\frac{{g}^{2}}{4\ensuremath{\pi}}\ensuremath{\sim}1$, the energy scale ${\ensuremath{\Lambda}}_{\mathrm{VV}}$ for the contact interaction is measured to be greater than 1419.0 GeV at the 95% confidence level. We set limits on the production of supersymmetric scalar electrons through $s$-channel single-photon annihilation and $t$-channel inelastic scattering. Using events with two noncollinear electrons and no other charged or observed neutral particles in the final state, we see one event which is consistent with a simple supersymmetric model but which is also consistent with QED. This allows us to exclude the scalar electron to 95% confidence level in the mass range 1.8 to 14.2 GeV/${\mathit{c}}^{2}$.

Published
1984

37. Study of neutrino-induced dimuon events in gargamelle at CERN-SPS

Author

B. Pattison, S. Natali, G. Carnesecchi, M. Willutzky, S. Ragazzi, D. Blum, C. Pascaud, N. Armenise, A. Pullia, P. Alibran, J. Bourotte, J. Gillespie, P. Lundborg, Donatella Cavalli, H. Sletten, E. Bellotti, J.P. Vialle, Ph. Heusse, F. Romano, S. Bonetti, M. Haguenauer, A.M. Lutz, B. Degrange, H. Burmeister, L. Zanotti, Gilbert Poulard, O. Erriquez, F. Jacquet, J. Sleeman, C. Matteuzzi, M. Rollier, G. Conforto, C. Longuemare, G. Bonneaud, P. Musset, A. Blondel, U. Nguyen-Khac, M.T. Fogli-Muciaccia, Salvatore Nuzzo, Heyd, Yvette, Institut de Recherches Subatomiques (IReS), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Semileptonic decay, Nuclear and High Energy Physics, Particle physics, Missing energy, Meson, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Hadron, Elementary particle, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear physics, Particle decay, Gargamelle, Neutrino, Particle Physics - Experiment
Abstract

This letter reports a study of 117 opposite-sign and 41 like-sign dimuons, in a wide-band neutrino exposure of Gargamelle at CERN SPS. No signal is found in the μ − μ − channel. The μ − μ + channel is found to be dominated by D-meson production and decay. There is evidence in these events for missing energy which may be interpreted as an unseen neutrino. The V 0 multiplicities, K 0 /event=0.53 −0.20 +0.25 and Λ /event=0.03 −0.04 +0.06 show only evidence for charmed meson production. Information on the D-meson fragmentation function is presented. In a specific model, a rate σ (μ − μ + ) σ(μ − ) =(0.72±0.14×10 −2 is found, independent of the energy. An investigation of these events for visible D-decays sets a limit on the life-time τ D −12 s at 90% C.L.

Published
1979

38. Upper limit on the tau-neutrino mass

Author

K. K. Gan, H. O. Ogren, G. Bonvicini, L. E. Price, L. K. Rangan, B. Cork, D. H. Miller, R. P. Thun, K. Sugano, R. L. McIlwain, S. Abachi, E. I. Shibata, J.M. Weiss, D. R. Rust, H. A. Neal, R. Debonte, F. J. Loeffler, N. Harnew, T. Trinko, A. A. Seidl, J. Schlereth, M. Derrick, D.S. Koltick, S. W. Gray, C. K. Jung, D. Errede, E. H. Low, P. Baringer, D. Blockus, Carl W. Akerlof, D. I. Meyer, I. Beltrami, M. Valdata-Nappi, J. W. Chapman, M. Willutzky, B. Musgrave, C. R. Ng, D. E. Wood, J. S. Loos, P. Kooijman, B. B. Brabson, Ben Bylsma, D. Nitz, and P. Kesten

Subjects
Nuclear physics, Semileptonic decay, Physics, Particle physics, Particle decay, Pair production, Tau neutrino, Hadron, Mass spectrum, General Physics and Astronomy, High Energy Physics::Experiment, Neutrino, Lepton
Abstract

A sample of tau-lepton decays to 5..pi../sup + -/..nu../sub tau/ and 5..pi../sup + -/..pi../sup 0/..nu../sub tau/, observed in the high-resolution spectrometer at the SLAC e/sup +/e/sup -/ storage ring PEP, have been used to place an upper limit on the mass of the tau neutrino of 84 MeV/c/sup 2/ at the 95% confidence level.

Published
1986

39. The INFN Eloisatron project: European long intersecting storage accelerator

Author

Giuseppe Iacobucci, F. Motta, J. Berbiers, F. Villa, G. D'Ali, K. Alberini, Rosario Nania, P. Galeotti, N. Cabibbo, G. Navarra, O. Saavedra, M. Bassetti, G. Venturi, C. Rizzuto, R. Bruzzese, G. Bari, A. Castelvetri, I. Laakso, G. Luches, G. Prisco, P. Pelfer, Maurizio Gasperini, M. Leo, V. De Sabbata, M. Willutzky, A. Marino, M. Dardo, G. Pocci, Antonella Castellina, S. Galassini, M. Steuer, G. Maccarrone, A. R. Leo, Antonino Zichichi, V. N. Melnikov, N. Sacchetti, G. Cara Romeo, W. Fulgione, S. Tazzari, L. Votano, L. Ferrario, E. Boschi, S. Vernetto, G. Rinaldi, M. Civita, C. Del Papa, P. Giusti, R. Meunier, P. Rotelli, Andrea Contin, K. Thorne, V. Braginski, P. Vallania, Gabriella Sartorelli, C. Castagnoli, R. Casaccia, M. Ricci, M. Puglisi, F. Palmonari, R. Goldoni, G. C. Trinchero, M. Spadoni, G. Torelli, A. Bertin, T. Massam, G. Soliani, G. Badino, G. Passotti, Luisa Cifarelli, M. Basile, V. Nassissi, C. Aglietta, F. Rohrbach, G. Papini, A. Vitale, G. Susinno, and F. Cindolo

Subjects
Physics, Particle physics, Order (business), Hadron, Operating system, High Energy Physics::Experiment, Vector meson, Global symmetry, computer.software_genre, computer, Energy (signal processing)
Abstract

Past experience, present knowledge, and a straightforward forecast in the extreme energy limits for subnuclear physics are reviewed, in order to put forward the case for a multi — TeV intersecting hadronic machine, whose basic features are described.

40. Measurement of the F-meson lifetime.

Author

Jung C, Abachi S, Akerlof C, Baringer P, Beltrami I I, Blockus D, Bonvicini G, Brabson B, Brom JM, Bylsma BG, Chapman J, Cork B, DeBonte R, Derrick M, Errede D, Gan KK, Gray SW, Guillaud J, Harnew N, Kesten P, Koltick D, Kooijman P, Loeffler FJ, Loos JS, Low EH, McIlwain RL, Meyer DI, Miller DH, Musgrave B, Neal H, Ng CR, Nitz D, Ogren H, Price LE, Rangan LK, Repond J, Rust DR, Schlereth J, Shibata EI, Sugano K, Thun R, Trinko T, Valdata-Nappi M, Weiss JM, Willutzky M, and Wood DE

Published
1986
Full Text
View/download PDF

41. Study of quark fragmentation in e+e- annihilation at 29 GeV: Global jet parameters and single-particle distributions.

Author

Bender D, Derrick M, Fernandez E, Fries R, Gieraltowski G, Hyman L, Jaeger K, Klem R, Kooijman P, Loos JS, LoPinto F, Musgrave B, Price LE, Schlereth J, Schreiner P, Singer R, Sugano K, Trinko T, Valdata-Nappi M, Ward C, Weiss JM, Ahlen S, Baranko G, Baringer P, Blockus D, Brabson B, Daigo M, Ems S, Forden GE, Gray SW, Guillaud J, Jung C, Neal H, Ogren H, Rust D, Smith P, Akerlof C, Chapman J, Errede D, Harnew N, Kesten P, Kooijman S, Meyer DI, Nitz D, Rubin D, Seidl AA, Thun R, Willutzky M, Beltrami I I, DeBonte R, Gan KK, Koltick D, Loeffler F, Mallik U, McIlwain R, Miller DH, Ng CR, Ong PP, Rangan LK, Shibata EI, Stevens R, Wilson RJ, Wood DE, and Cork B

Published
1985
Full Text
View/download PDF

42. Experimental study of the reactions e+e--->e+e- and e+e---> gamma gamma at 29 GeV.

Author

Derrick M, Gan KK, Kooijman P, Loos JS, Musgrave B, Price LE, Schlereth J, Sugano K, Weiss JM, Wood DE, Blockus D, Brabson B, Gray SW, Jung C, Neal H, Ogren H, Rust DR, Valdata-Nappi M, Akerlof C, Bonvicini G, Chapman J, Errede D, Harnew N, Kesten P, Meyer DI, Nitz D, Seidl AA, Thun R, Trinko T, Willutzky M, Abachi S, Baringer P, Beltrami I I, Bylsma BG, DeBonte R, Koltick D, Loeffler FJ, Low EH, Mallik U, McIlwain RL, Miller DH, Ng CR, Rangan LK, Shibata EI, and Cork B

Published
1986
Full Text
View/download PDF

43. Observation of tensor and scalar mesons produced in e+e- annihilation at 29 GeV.

Author

Abachi S, Baringer P, Bylsma BG, DeBonte R, Koltick D, Loeffler FJ, Low EH, McIlwain RL, Miller DH, Ng CR, Rangan LK, Shibata EI, Derrick M, Gan KK, Kooijman P, Loos JS, Musgrave B, Price LE, Repond J, Sugano K, Weiss JM, Wood DE, Blockus D, Brabson B, Brom J, Jung C, Ogren H, Rust DR, Akerlof C, Chapman J, Errede D, Kesten P, Meyer DI, Nitz D, Seidl AA, Thun R, Willutzky M, and Cork B

Published
1986
Full Text
View/download PDF

44. Hadron production in e+e- annihilation at sqrt s =29 GeV.

Author

Derrick M, Fernandez E, Gan KK, Fries R, Hyman L, Kooijman P, Loos JS, Musgrave B, Price LE, Schlereth J, Sugano K, Weiss JM, Wood DE, Baranko G, Blockus D, Brabson B, Daigo M, Forden GE, Gray SW, Jung C, Neal H, Ogren H, Rust DR, Valdata-Nappi M, Akerlof C, Bonvicini G, Chapman J, Errede D, Harnew N, Kesten P, Kooijman S, Meyer DI, Nitz D, Rubin D, Seidl AA, Thun R, Trinko T, Willutzky M, Abachi S, Baringer P, Beltrami I I, Bylsma BG, De Bonte R, Koltick D, Loeffler FJ, Low EH, Mallik U, McIlwain RL, Miller DH, Ng CR, Ong PP, Rangan LK, Shibata EI, Wilson aR, Cork B, Keller L, and Va'vra J

Published
1987
Full Text
View/download PDF

45. Upper limit on the tau-neutrino mass.

Author

Abachi S, Akerlof C, Baringer P, Beltrami I I, Blockus D, Bonvicini G, Brabson B, Bylsma BG, Chapman J, Cork B, DeBonte R, Derrick M, Errede D, Gan KK, Gray SW, Harnew N, Jung C, Kesten P, Koltick D, Kooijman P, Loeffler FJ, Loos JS, Low EH, McIlwain RL, Meyer DI, Miller DH, Musgrave B, Neal H, Nitz D, Ng CR, Ogren H, Price LE, Rangan LK, Rust DR, Schlereth J, Seidl AA, Shibata EI, Sugano K, Thun R, Trinko T, Valdata-Nappi M, Weiss JM, Willutzky M, and Wood DE

Published
1986
Full Text
View/download PDF

46. New results on the reaction e+e---> micro+ micro- at sqrt s =29 GeV.

Author

Derrick M, Fernandez E, Fries R, Hyman L, Kooijman P, Loos JS, Musgrave B, Price LE, Schlereth J, Sugano K, Weiss JM, Wood DE, Ahlen S, Baranko G, Baringer P, Blockus D, Brabson B, Daigo M, Forden GE, Gray SW, Guillaud J, Jung C, Neal H, Ogren H, Rust DR, Valdata-Nappi M, Akerlof C, Chapman J, Errede D, Harnew N, Kesten P, Kooijman S, Meyer DI, Nitz D, Rubin D, Seidl AA, Thun R, Trinko T, Willutzky M, Beltrami I I, DeBonte R, Gan KK, Koltick D, Loeffler FJ, Mallik U, McIlwain RL, Miller DH, Ng CR, Ong PP, Rangan LK, Shibata EI, Stevens R, Wilson RJ, Cork B, Keller L, and Va'vra J

Published
1985
Full Text
View/download PDF

47. Production of phi and F(1970)--> phi pi in e+e- annihilation at 29 GeV.

Author

Derrick M, Fernandez E, Fries R, Hyman L, Kooijman P, Loos JS, Musgrave B, Price LE, Schlereth J, Sugano K, Weiss JM, Wood DE, Baranko G, Baringer P, Blockus D, Brabson B, Forden GE, Gray SW, Jung C, Neal H, Ogren H, Rust DR, Valdata-Nappi M, Akerlof C, Bonvicini G, Chapman J, Errede D, Harnew N, Kesten P, Kooijman S, Meyer DI, Nitz D, Rubin D, Seidl AA, Thun R, Trinko T, Willutzky M, Beltrami I I, Bylsma BG, DeBonte R, Koltick D, Gan KK, Loeffler FJ, Low EH, Mallik U, McIlwain RL, Miller DH, Ng CR, Ong PP, Rangan LK, Shibata EI, Wilson aR, Cork B, Keller L, and Va'vra J

Published
1985
Full Text
View/download PDF

48. Measurement of the topological branching fractions of the tau lepton.

Author

Akerlof C, Baranko G, Baringer P, Beltrami I I, Blockus D, Bonvicini G, Brabson B, Bylsma BG, Chapman J, Cork B, DeBonte R, Derrick M, Errede D, Fernandez E, Forden GE, Fries R, Gan KK, Gray SW, Harnew N, Hyman L, Jung C, Keller L, Kesten P, Koltick D, Kooijman P, Kooijman S, Loeffler FJ, Loos JS, Low EH, McIlwain RL, Meyer DI, Miller DH, Musgrave B, Neal H, Ng CR, Nitz D, Ogren H, Ong PP, Price LE, Rangan LK, Rubin D, Rust DR, Schlereth J, Seidl AA, Shibata EI, Sugano K, Thun R, Trinko T, Valdata-Nappi M, Va'vra J, Weiss JM, Willutzky M, Wilson RJ, and Wood DE

Published
1985
Full Text
View/download PDF

49. Study of quark fragmentation in e+e- annihilation at 29 GeV: Charged-particle multiplicity and single-particle rapidity distributions.

Author

Derrick M, Gan KK, Kooijman P, Loos JS, Musgrave B, Price LE, Repond J, Schlereth J, Sugano K, Weiss JM, Wood DE, Baranko G, Blockus D, Brabson B, Brom JM, Gray SW, Jung C, Neal H, Ogren H, Rust DR, Valdata-Nappi M, Akerlof C, Bonvicini G, Chapman J, Errede D, Harnew N, Kesten P, Meyer DI, Nitz D, Seidl AA, Thun R, Trinko T, Willutzky M, Abachi S, Baringer P, Mallik U, Beltrami I I, Bylsma BG, DeBonte R, Loeffler F, Low EH, McIlwain RL, Miller DH, Ng CR, Rangan LK, Shibata EI, and Cork B

Published
1986
Full Text
View/download PDF

50. Lambda production in e+e- annihilations at 29 GeV: Comparison with Lund-model predictions.

Author

Baringer P, Abachi S, Akerlof C, Beltrami I I, Blockus D, Bonvicini G, Brabson B, Brom JM, Bylsma BG, Chapman J, Cork B, DeBonte R, Derrick M, Daigo M, Errede D, Gan KK, Gray SW, Guillaud J, Harnew N, Jung C, Kesten P, Koltick D, Kooijman P, Loeffler FJ, Loos JS, Low EH, McIlwain RL, Meyer DI, Miller DH, Musgrave B, Neal H, Nitz D, Ng CR, Ogren H, Price LE, Rangan LK, Rust DR, Schlereth J, Seidl AA, Shibata EI, Sugano K, Thun R, Trinko T, Valdata-Nappi M, Weiss JM, Willutzky M, and Wood DE

Published
1986
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results