Search

Your search keyword '"W. G. Jones"' showing total 38 results
Start Over Author "W. G. Jones" Journal physics letters b
38 results on '"W. G. Jones"'

1. NaI dark matter limits and the NAIAD array – a detector with improved sensitivity to WIMPs using unencapsulated NaI

Author

J. J. Quenby, C.D. Peak, N. J. C. Spooner, N. J. T. Smith, P. K. Lightfoot, T. J. Sumner, I. Liubarsky, Matthew J. Lehner, J. C. Barton, J.D. Lewin, T. B. Lawson, J. W. Roberts, A. Bewick, G.J. Homer, Daniel Tovey, W. G. Jones, P.F. Smith, G. J. Alner, J. E. McMillan, and V. A. Kudryavtsev

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Recoil, WIMP, Monte Carlo method, Detector, Dark matter, Sensitivity (electronics), Spin-½
Abstract

Re-analysis of published data from the UKDMC NaI Tl dark matter experiment is presented using latest spin factors and comparison is made with the sensitivity predicted for NAIAD, a 100 kg NaI detector concept based on unencapsulated . NaI Tl . We present experimental results and Monte Carlo simulations for NAIAD and show that a factor of 1.5-2 improvement in energy threshold is achievable over conventional NaI dark matter detectors with consequent ; 50% improvement in nuclear recoil discrimination at 10 keV. An overall improvement in sensitivity to spin dependent WIMP interactions of factor 50, based on 100 kg = yrs of data, is predicted relative to previous UKDMC limits. q 2000 Published by Elsevier Science B.V. All rights reserved.

Published
2000
Full Text
View/download PDF

2. Results from the first stage of a UK Galactic dark matter search using low background sodium iodide detectors

Author

G.J. Davies, A. Bewick, J. J. Quenby, A. M. Cruise, J. Saunders, G.T.J. Arnison, C.H. Lally, P.R. Blake, T. J. Sumner, N. J. C. Spooner, W. G. Jones, P.F. Smith, M.J. van den Putte, T. Ali, G. J. Alner, M. J. Lea, N. J. T. Smith, J. C. Barton, J.D. Lewin, J.P. Li, G.J. Homer, C.C. Zammit, D. Shaul, A.D. Caplin, P. Stefanyi, R A Stradling, and S.M. Grant

Subjects
Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, Scattering, Dark matter, Astrophysics::Instrumentation and Methods for Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, WIMP Argon Programme, Scintillator, Spectral line, Nuclear physics, WIMP, Weakly interacting massive particles, High Energy Physics::Experiment, Light dark matter
Abstract

Low-energy background spectra from 1.3 kg and 6.2 kg NaI(TI) crystal scintillators operating in the shielded Boulby underground facility were measured. Upper limits to the scattering interaction rates and cross-sections of Galactic dark matter in the form of Weakly Interacting Massive Particles (WIMPs) are calculated from these data. This work provides an improved limit for spin-dependent interactions for WIMP masses above 10 GeV.

Published
1995
Full Text
View/download PDF

3. Liquid xenon as a dark matter detector. Prospects for nuclear recoil discrimination by photon timing

Author

W. G. Jones, P.F. Smith, J.D. Davies, G.J. Davies, and J.D. Lewin

Subjects
Physics, Nuclear and High Energy Physics, Scintillation, Photon, Monte Carlo method, Dark matter, chemistry.chemical_element, Nuclear physics, Recoil, Xenon, chemistry, Ionization, Scintillation counter, Atomic physics
Abstract

Two mechanisms lead to liquid xenon scintillatlon, and are excited differently by incident electrons and by heavy charged nuclei. This could be used to discriminate nuclear recoil events from radioactive background in a search for hypothetical Galactic dark matter particles. To achieve low energy threshold a likelihood analysis is proposed using the time intervals between detected photons. Results are presented of Monte Carlo simulations, showing the background rejection achievable as a function of the number of detected photons. Some comments are included on background discrimination by simultaneous measurement of scintillation and ionization signals.

Published
1994
Full Text
View/download PDF

4. RHO-RHO production by two photon scattering

Author

P. Schmüser, H. M. Fischer, J. Rimkus, V. Kadansky, D. Notz, H. U. Martyn, R. Rüsch, J. Pyrlik, H. L. Lynch, Gl Salmon, B. Löhr, P. Joos, B. Foster, A. Schultz von Dratzig, Walter Dr. Hillen, H. Hartmann, T. Meyer, John Freeman, M. Ogg, Georg Zobernig, G. Peise, H. Boerner, M. Wollstadt, K. W. Bell, R. Riethmüller, A. Ladage, Rj Cashmore, U. Karshon, H. Hultschig, W. G. Jones, J. Proudfoot, P. Koehler, S. Yarker, John Illingworth, P. Mättig, D. G. Cassel, W. Koch, B. H. Wiik, John Hart, P. L. Woodworth, N. A. Downie, R. Wedemeyer, Norbert Wermes, G. Poelz, Sau Lan Wu, T. R. Wyatt, H. G. Sander, B. Roe, H. Kowalski, D. R. Quarrie, U. Kötz, K. Lübelsmeyer, D. A. Garbutt, P. Söding, R.C.E. Devenish, P. Grossmann, D. M. Binnie, E. Hilger, D. Pandoulas, M. Holder, K. Gather, H. Burkhardt, P. Lecomte, R. Brandelik, D. Revel, Gy. Wolf, Y. Eisenberg, E.E. Ronat, W. Braunschweig, D. Lüke, G. Knop, G. Mikenberg, D. Heyland, D.W. Schmitz, P. J. Dornan, R. Fohrmann, P. Leu, Ehud Duchovni, D. H. Saxon, O. Römer, Stephen Lloyd, A. Shapira, D. Trines, W. Wallraff, Hermann Kolanoski, J. K. Sedgbeer, C. Youngman, L. Koepke, Roger Barlow, M. Schliwa, and I. C. Brock

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Two-photon excitation microscopy, Scattering, Electron–positron annihilation
Published
1980
Full Text
View/download PDF

5. A measurement of σtot(e+e− → hadrons) for cm energies between 12.0 and 36.7 GeV

Author

W. Koch, B. Löhr, P. Mättig, T. D. Jones, P. Joos, G. Poelz, H. Hartmann, P. Schmüser, E. Wicklund, R. Wedemeyer, W. Schütte, J. Proudfoot, RA Stern, J. Franzke, H. Kowalski, T. Barklow, J. Pyrlik, R.C.E. Devenish, D. Notz, H. L. Lynch, O. Römer, R. Carnegie, R. Riethmüller, M. Wollstadt, M. Holder, H. U. Martyn, Y. Eisenberg, H. M. Fischer, D. Revel, H. Hultschig, B. H. Wiik, Rj Cashmore, D. M. Binnie, K. H. Mess, H. Burkhardt, Sau Lan Wu, Norbert Wermes, P. J. Dornan, John Illingworth, Georg Zobernig, Ehud Duchovni, P. L. Woodworth, R. Beuselinck, H. Boerner, W. Braunschweig, W. G. Jones, D. H. Saxon, C. Youngman, Walter Dr. Hillen, L. Köpke, G. Peise, D. R. Quarrie, John Freeman, K. Gather, S Yarker, E.E. Ronat, Gy. Wolf, B. Foster, J. C. Hart, Sl Lloyd, H. G. Sander, M. Ogg, J. Sedgbeer, A. Shapira, W. Wallraff, I. C. Brock, T. R. Wyatt, G. Knop, J. Harvey, J. Rimkus, Hl Krasemann, I. Al-Agil, S. Cooper, G. Rudolph, D. Pandoulas, U. Karshon, P. Grossmann, K. Lübelsmeyer, P. Söding, M. G. Bowler, Giora Mikenberg, Gl Salmon, F. J. Kirschfink, T. Meyer, A. Ladage, D. Heyland, D.W. Schmitz, A. J. Campbell, R. Fohrmann, P. Leu, Juergen Thomas, K. W. Bell, D. Lüke, D. Trines, Hermann Kolanoski, U. Kötz, D. A. Garbutt, E. Hilger, and R. Brandelik

Subjects
Quantum chromodynamics, Physics, Quark, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, High Energy Physics::Experiment, Nuclear Experiment, Mass parameter
Abstract

The ration R = σ (e + e − → hadrons) σ μμ was measured between 12.0 and 36.7 GeV c.m. energy W with a precision of typically ± 5.2%. R is found to be constant with an average R = 4.01 ± 0.03 (stat) ± (syst.) for W ⩾ 14 GeV. Quarks are found to be point-like, the mass parameter describing a possible quark form-factor being larger than 186 GeV. Fits including QCD corrections and a weak neutral-current contribution are presented.

Published
1982
Full Text
View/download PDF

6. A search for fractional electric charge on levitated niobium spheres

Author

W. G. Jones, P.F. Smith, H.E. Walford, J.D. Lewin, and G.J. Homer

Subjects
Physics, Nuclear and High Energy Physics, Classical mechanics, chemistry, Condensed matter physics, Niobium, chemistry.chemical_element, SPHERES, equipment and supplies, Residual, Magnetic levitation system, Electric charge, Particle Physics - Experiment
Abstract

A new magnetic levitation system has been used to investigate the residual electric charge on iron-coated 0.28 mm niobium spheres. A total of 64 measurements on 46 different samples show no evidence for the apparent ±e 3 values observed in the Standard experiments using samples of similar size and material, but differing in pre-test treatment and environment. Further experiments to investigate the possible effect of the latter are in progress.

Published
1985
Full Text
View/download PDF

7. Differential cross sections for in the CM energy range from 2.0 to 3.1 GeV

Author

Georg Zobernig, Gy. Wolf, M. Wollstadt, H. Siebke, R. J. Cashmore, Ehud Duchovni, U. Kötz, T. R. Wyatt, D. A. Garbutt, T. Kracht, Ch. Xiao, E. Lohrmann, Joseph Izen, D. R. Quarrie, H. Kück, D. M. Binnie, D. Pandoulas, M. Dittmar, Tegid Jones, D. Heyland, P. Leu, R. Wedemeyer, R.C.E. Devenish, H. Venkataramania, Gl Salmon, L. Köpke, M. Cherney, T. Barklow, Juergen Thomas, J. Pyrlik, U. Karshon, E. Hilger, D.W. Schmitz, A. Shapira, G. Yekutieli, Hl Krasemann, A. Jocksch, D. Strom, H. Kowalski, H. G. Sander, P. J. Dornan, A. J. Campbell, W. Schütte, Fernando Barreiro, W. Koch, Norbert Wermes, G. Poelz, W. G. Jones, A. Ladage, I. Al-Agil, R. Fohrmann, A. Caldwell, Stephen Lloyd, K. H. Mess, M. Rushton, M. Mermikides, D. Revel, H. U. Martyn, R. Mir, G. Rudolph, B. Neumann, P. Rosskamp, P. L. Woodworth, M. G. Bowler, D. Lüke, K. W. Bell, P. Mättig, J. Rimkus, C. Youngman, D. Trines, Walter Dr. Hillen, G. Peise, I. C. Brock, P. E. L. Clarke, W. Wallraff, Hermann Kolanoski, J. K. Sedgbeer, K. Lübelsmeyer, S. J. Cooper, Y. Eisenberg, W. Braunschweig, H. Hartmann, J. Proudfoot, M. Althoff, D. Notz, D. H. Saxon, J. McCardle, K. Gather, G. Mikenberg, R. Beuselinck, F. J. Kirschfink, E.E. Ronat, P. Grossmann, G. Knop, B. Löhr, P. Joos, M. Holder, B. Foster, H. Hultschig, B. H. Wiik, John Hart, E. Wicklund, Sau Lan Wu, J. Harvey, and H. M. Fischer

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Angular range, Range (particle radiation), Cross section (physics), Angular distribution, Scattering, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, Storage ring
Abstract

Exclusive production of proton-antiproton pairs by two photon scattering at CM energies between 2.0 GeV and 3.1 GeV has been measured with the TASSO detector at the e + e − storage ring PETRA. The angular distribution is flat within the accepted CM angular range | cos Θ ∗ |⩽0.7 . The integrated cross section (| cos Θ ∗ |⩽0.6) drops from about 4 nb at 2 GeV to less than 0.5 nb above 3 GeV. For the two-photon production of the η c (2984) and its subsequent decay into proton-antiproton the upper limit Γ(η c →γγ)· B (η c → p p ) keV (95% CL) is found.

Published
1983
Full Text
View/download PDF

8. Λ, production in e+e− annihilation at 33 GeV centre of mass energy

Author

M. Holder, K. Gather, G. Mikenberg, H. L. Lynch, E. Hilger, D. R. Quarrie, D. Trines, R. Beuselinck, A. Schultz von Dratzig, W. Wallraff, Hermann Kolanoski, J. K. Sedgbeer, L. Köpke, P. Mättig, H. M. Fischer, T. D. Jones, W. Koch, D. H. Saxon, R. Brandelik, Georg Zobernig, D. M. Binnie, K. W. Bell, H. G. Sander, G. Poelz, H. Hartmann, F. J. Kirschfink, John Freeman, G. Rudolph, I. Al-Agil, M. Ogg, W. G. Jones, D. Notz, S. Cooper, M. Wollstadt, R.C.E. Devenish, R. Rüsch, P. Grossmann, E.E. Ronat, Juergen Thomas, P. Joos, B. Foster, Hl Krasemann, G. Knop, John Illingworth, P. L. Woodworth, A. Shapira, Walter Dr. Hillen, G. Peise, R. J. Cashmore, R. Riethmüller, U. Kötz, Gy. Wolf, R. A. Stern, E. Wicklund, H. U. Martyn, S. Yarker, J. Proudfoot, Norbert Wermes, D. A. Garbutt, J. Rimkus, Gl Salmon, H. Hultschig, B. H. Wiik, H. Burkhardt, John Hart, H. Kowalski, T. R. Wyatt, T. Meyer, Sau Lan Wu, A. Ladage, J. Pyrlik, P. Schmüser, Ehud Duchovni, U. Karshon, K. Lübelsmeyer, P. Leu, D. Lüke, P. Söding, Stephen Lloyd, D. Heyland, K. H. Mess, D.W. Schmitz, P. J. Dornan, A. J. Campbell, R. Fohrmann, D. Pandoulas, D. Revel, P. Lecomte, O. Römer, C. Youngman, I. C. Brock, Y. Eisenberg, M. G. Bowler, H. Boerner, W. Braunschweig, T. Barklow, and R. Wedemeyer

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Annihilation, Production (economics), Energy (signal processing)
Published
1981
Full Text
View/download PDF

9. Properties of charm jets produced in e+e− annihilation near 34 GeV

Author

Gl Salmon, M. Althoff, D. Notz, U. Karshon, R. J. Nowak, M. Wollstadt, T. D. Jones, D.W. Schmitz, W. Koch, P. Rosskamp, A. Ladage, G. Poelz, R. Wedemeyer, H. Hartmann, T. Kracht, T. Barklow, W. Braunschweig, H. Kück, H. U. Martyn, A. Shapira, P. Grossmann, H. Kowalski, Norbert Wermes, C. M. Hawkes, H. Venkataramania, R.C.E. Devenish, D. R. Quarrie, D. M. Binnie, R. Fohrmann, J. Proudfoot, P. L. Woodworth, U. Kötz, Gy. Wolf, Michael Dittmar, K. Gather, A. L. Campbell, G. Yekutieli, Rj Cashmore, E. Hilger, Giora Mikenberg, B. Neumann, W. G. Jones, W. A. T. Wan Abdullah, D. A. Garbutt, J. Thomas, J. Sedgbeer, F. J. Kirschfink, M. Holder, D. Lüke, P. E. L. Clarke, H. Hultschig, B. H. Wiik, John Hart, Sau Lan Wu, P. J. Dornan, C. Jenkins, D. Pandoulas, J. Rimkus, K. Lübelsmeyer, H. Siebke, E.E. Ronat, T. R. Wyatt, G. Knop, P. Leu, Ch. Xiao, R. Mir, G. E. Forden, W. Schütte, Fernando Barreiro, Y. Eisenberg, M. Mermikides, D. Revel, L. Köpke, M. Cherney, M. G. Bowler, H. G. Sander, A. Jocksch, C. Youngman, J. McCardle, A. Caldwell, Stephen Lloyd, Ehud Duchovni, D. Strom, M. Rushton, G. Rudolph, B. Löhr, Walter Dr. Hillen, G. Peise, H. M. Fischer, Georg Zobernig, D. K. Hasell, P. Mättig, Joseph Izen, P. Joos, B. Foster, E. Wicklund, D. Trines, W. Wallraff, Philip Bull, J. Harvey, R. Beuselinck, K. W. Bell, D. H. Saxon, J. Pyrlik, Hermann Kolanoski, Hl Krasemann, and E. Lohrmann

Subjects
Quark, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Meson, Astrophysics::High Energy Astrophysical Phenomena, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Elementary particle, Charged particle, Nuclear physics, High Energy Physics::Experiment, Nuclear Experiment, Boson
Abstract

D ∗± production via e + e − → D ∗± X was studied at CM energies near 34 GeV. The charged particles produced in the hemisphere opposite to that of the D ∗ were used to investigate the fragmentation of charm jets. All spectra studied show a close similarity between the charm jet and the average jet obtained by summing over all quark flavours. The spectra of particles produced in the D ∗ hemisphere were used to study separately first rank and higher rank fragmentation.

Published
1984
Full Text
View/download PDF

10. Production of in photon-photon collisions and the excitation of the tensor meson f′(1515)

Author

I. Al-Agil, M. Wollstadt, J. McCardle, K. Gather, G. Mikenberg, Gy. Wolf, R. Beuselinck, M. G. Bowler, H. Kowalski, C. Youngman, D. Revel, Y. Eisenberg, P. E. L. Clarke, H. U. Martyn, J. K. Sedgebeer, P. Grossmann, L. Köpke, R. J. Cashmore, M. Cherney, H. Burkhardt, R.C.E. Devenish, G. Rudolph, H. G. Sander, J. Rimkus, W. Braunschweig, D. R. Quarrie, Gl Salmon, Ehud Duchovni, H. Venkataramania, D. Trines, J. Franzke, U. Kötz, T. Meyer, T. D. Jones, W. G. Jones, H. Kück, A. Ladage, J. Pyrlik, P. Schmüser, D. A. Garbutt, John Illingworth, S. J. Cooper, P. L. Woodworth, F. J. Kirschfink, M. Althoff, H. M. Fischer, D. Notz, E. Hilger, W. Wallraff, M. Holder, Hermann Kolanoski, Walter Dr. Hillen, G. Peise, H. Hultschig, Georg Zobernig, B. H. Wiik, John Hart, H. Hartmann, W. Koch, Sau Lan Wu, B. Löhr, K. Lübelsmeyer, R. Brandelik, G. Poelz, J. Proudfoot, P. Söding, T. Barklow, P. Joos, E. Wicklund, D. Pandoulas, Stephen Lloyd, D. Heyland, H. Siebke, K. H. Mess, G. Yekutieli, T. R. Wyatt, K. W. Bell, P. Mättig, E.E. Ronat, G. Knop, Norbert Wermes, Juergen Thomas, R. Wedemeyer, B. Foster, D. M. Binnie, A. Shapira, U. Karshon, I. C. Brock, D. Hochman, H. Boerner, R. Carnegie, E. Lohrmann, Hl Krasemann, D. Lüke, P. Leu, D.W. Schmitz, P. J. Dornan, A. J. Campbell, R. Fohrmann, R. Riethmüller, J. Harvey, D. H. Saxon, and W. Schütte

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle decay, Pair production, Meson, Branching fraction, Hadron, Elementary particle, Atomic physics, Helicity, Lepton
Abstract

We have observed exclusive production of K + K − and K S O K S O pairs and the excitation of the f′(1515) tensor meson in photon-photon collisions. Assuming the f′ to be production in a helicity 2 state, we determine Λ( f ′ → γγ) B( f ′ → K K ) = 0.11 ± 0.02 ± 0.04 keV . The non-strange quark of the f′ is found to be less than 3% (95% CL). For the θ(1640) we derive an upper limit for the product Λ(θ rarr; γγ K K ) keV (95% CL ) .

Published
1983
Full Text
View/download PDF

11. Determination of the average lifetime of bottom hadrons

Author

B. Löhr, P. Joos, B. Foster, W. Schütte, Fernando Barreiro, H. Siebke, M. Takashima, E. Wicklund, Y. Eisenberg, Malte Hildebrandt, D. Strom, D. J. Mellor, W. Braunschweig, K. W. Bell, P. Mättig, C. M. Hawkes, Gy. Wolf, Ehud Duchovni, D. Trines, G. Baranko, M. Rushton, G. Poelz, M. Mermikides, D. Revel, C. Jenkins, Rj Cashmore, D. K. Hasell, G. Rudolph, P. Leu, A. Eskreys, R. Mir, A. Ladage, D. H. Saxon, M. G. Bowler, H. Hartmann, Hermann Kolanoski, J. K. Sedgbeer, H. Venkataramania, R.C.E. Devenish, U. Karshon, P. Rosskamp, D.W. Schmitz, T. D. Jones, J. Pyrlik, G. Yekutieli, P. J. Dornan, A. J. Campbell, E. Hilger, R. Fohrmann, M. Althoff, A. Jocksch, P. Grossmann, D. Notz, M. Cherney, Joseph Izen, T. Kracht, G. E. Forden, A. Caldwell, J. Thomas, G. Kreutz, J. McCardle, H. M. Fischer, Wolfram Dietrich Zeuner, D. Lüke, Stephen Lloyd, S. Ritz, K. Gather, T. Tymieniecka, D. Pandoulas, U. Kötz, V. Mertens, Giora Mikenberg, R. Beuselinck, D. A. Garbutt, C. Youngman, R. J. Nowak, P. Dauncey, Georg Zobernig, B. Neumann, R. Wedemeyer, W. Wallraff, Philip Bull, H. Kück, H. U. Martyn, J. Harvey, K. U. Pösnecker, E.E. Ronat, G. Knop, A. Shapira, M. Dittmar, M. Holder, H. Hultschig, John Hart, Sau Lan Wu, E. Lohrmann, J. Eisenmann, F. J. Kirschfink, S. Brandt, H. Kowalski, Hl Krasemann, D. M. Binnie, W. G. Jones, W. A. T. Wan Abdullah, and P. E. L. Clarke

Subjects
Nuclear physics, Physics, Quark, Semileptonic decay, Nuclear and High Energy Physics, Particle physics, Annihilation, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, High Energy Physics::Experiment
Abstract

We have determined the average lifetime of hadrons containing b quarks produced in e+e− annihilation to be τ B = 1.83 +0.83 +0.37 − −0.34 ×10 −12 s . Our method uses charged decay products from both non-leptonic and semileptonic decay modes.

Published
1984
Full Text
View/download PDF

12. Observation of production in e+e− anihilation

Author

W. G. Jones, Ehud Duchovni, H. Venkataramania, B. Löhr, C. Youngman, D. Trines, P. Joos, F. J. Kirschfink, B. Foster, P. L. Woodworth, J. Harvey, J. Pyrlik, E. Wicklund, Gl Salmon, E. Hilger, W. Schütte, Fernando Barreiro, W. Wallraff, C. Jenkins, I. C. Brock, M. G. Bowler, M. Holder, H. Hultschig, Hermann Kolanoski, J. K. Sedgbeer, D. Strom, Joseph Izen, D. Lüke, A. Jocksch, J. Rimkus, M. Rushton, B. H. Wiik, John Hart, A. Ladage, D. M. Binnie, Y. Eisenberg, D. R. Quarrie, M. Dittmar, W. Braunschweig, M. Althoff, D. Notz, H. M. Fischer, G. Rudolph, Sau Lan Wu, R. Wedemeyer, E. Lohrmann, P. Grossmann, Georg Zobernig, J. McCardle, K. Gather, D. Pandoulas, Ch. Xiao, M. Mermikides, D. Revel, G. Mikenberg, R. Beuselinck, P. Rosskamp, W. Koch, R. Mir, B. Neumann, R. J. Cashmore, Gy. Wolf, T. Barklow, Tegid Jones, G. Poelz, U. Kötz, M. Wollstadt, Norbert Wermes, P. Leu, G. Yekutieli, E.E. Ronat, A. Caldwell, Stephen Lloyd, R.C.E. Devenish, H. Siebke, D. A. Garbutt, K. H. Mess, T. R. Wyatt, G. Knop, H. Hartmann, K. W. Bell, P. Mättig, D.W. Schmitz, A. Shapira, P. J. Dornan, Hl Krasemann, A. J. Campbell, J. Proudfoot, T. Kracht, L. Köpke, R. Fohrmann, M. Cherney, Walter Dr. Hillen, G. Peise, H. G. Sander, U. Karshon, K. Lübelsmeyer, D. H. Saxon, D. Heyland, Juergen Thomas, H. Kowalski, W. A. T. Wan Abdullah, P. E. L. Clarke, H. Kück, and H. U. Martyn

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Annihilation, Electron–positron annihilation, Hadron, Event (particle physics)
Abstract

We present evidence for the production of Ξ· − , Ξ − in e+e− annihilation into hadrons. Our measurements yields: 0.026 ± 0.008 (stat.) ± 0.009 (syst.) Ξ − , Ξ − per hadronic event at W ∼ 34 GeV. Using our previous measurements of Λ, Λ and p, p production we obtain the relative yields (Ξ − , Ξ − /(Λ, Λ = 0.087 ± 0.03 ( stat. ) ± 0.03 ( syst. ) and (Ξ − , Ξ − /( p , p = 0.033 ± 0.011 ( stat. ) ± 0.011 ( syst. ) .

Published
1983
Full Text
View/download PDF

13. A search for fractional charge changes on levitated niobium spheres

Author

J.D. Lewin, G.J. Homer, H.E. Walford, W. G. Jones, and P.F. Smith

Subjects
Physics, Nuclear and High Energy Physics, Niobium, chemistry.chemical_element, Charge (physics), Mechanics, Fault (power engineering), Null (physics), Classical mechanics, chemistry, SPHERES, Transient (oscillation), Anomaly (physics), Event (particle physics)
Abstract

We discuss a single anomalous sequence of data simulating a 1 3 e charge change on a levitated niobium sphere, and search for repetitions of this event under more closely monitored running conditions. No further examples of the anomaly have been found, despite a trebling of the total running time and an explanation in terms of a hypothetical transient fault condition is suggested. The null results on niobium spheres have been extended to a total of 82 tests on 64 different samples.

Published
1986
Full Text
View/download PDF

14. Searches for fractional electric charge in tungsten

Author

G.J. Homer, H.E. Walford, W. G. Jones, P.F. Smith, and J.D. Lewin

Subjects
Physics, Nuclear and High Energy Physics, chemistry.chemical_compound, chemistry, Tungsten carbide, Niobium, chemistry.chemical_element, SPHERES, Tungsten, Composite material, Electric charge
Abstract

Tests for fractional electric charge have been carried out on levitated tungsten samples of three types: tungsten carbide spheres, tungsten-coated steel and niobium spheres, and cylinders of tungsten wire. A total of 3 mg tungsten was tested, and no evidence for 1 3e charges was found, suggesting that the positive Stanford results reported for niobium are unlikely to have resulted from contact with tungsten during heat treatment.

Published
1987
Full Text
View/download PDF

15. Exclusive proton-antiproton production in two-photon collisions

Author

O. Römer, John Illingworth, H. Hultschig, AS von Dratzig, P. Schmüser, H. Kowalski, B. H. Wiik, P. L. Woodworth, E. Hilger, H. Boerner, P. J. Dornan, I. Al-Agil, R. Brandelik, W. G. Jones, M. Holder, K. Gather, T. D. Jones, U. Karshon, H. M. Fischer, H. L. Lynch, Georg Zobernig, Y. Eisenberg, S. Cooper, Gy. Wolf, W. Koch, J. Rimkus, S Yarker, P. Mättig, W. Braunschweig, H. Hartmann, K. H. Mess, G. Poelz, A. Shapira, J. Pyrlik, Hl Krasemann, R. Wedemeyer, T. R. Wyatt, P. Leu, Norbert Wermes, R.C.E. Devenish, I. C. Brock, D Pandoulas, RA Stern, S. L. Wu, H. U. Martyn, T. Barklow, JK Sedgebeer, M. Wollstadt, D. Revel, J. Proudfoot, P. Grossmann, U. Kötz, K. Lübelsmeyer, Giora Mikenberg, P. Söding, Rj Cashmore, D. M. Binnie, Gl Salmon, M. G. Bowler, D. A. Garbutt, D. Lüke, K. W. Bell, Ehud Duchovni, T. Meyer, B. Foster, F. J. Kirschfink, D. Trines, Juergen Thomas, D. Heyland, A. Ladage, D.W. Schmitz, D. Notz, E.E. Ronat, C. Youngman, H. Burkhardt, A. J. Campbell, G. Knop, R. Fohrmann, L. Köpke, Quarrie, H. G. Sander, Walter Dr. Hillen, G. Peise, Hermann Kolanoski, G. Rudolph, John Freeman, M. Ogg, R. Beuselinck, P. Joos, W. Wallraff, E. Wicklund, R. Riethmüller, D. H. Saxon, J. C. Hart, and Sl Lloyd

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Cross section (physics), Range (particle radiation), Proton, Two-photon excitation microscopy, Scattering, Antiproton, Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment, Storage ring
Abstract

Production of proton-antiproton pairs by two-photon scattering has been observed at the electron-position storage ring PETRA. A total of eight proton-antiproton pairs have been identified using the time-of-flight technique. We have measured a total cross section of 4.5 ± 0.8 nb in the photon-photon c.m. energy range 2.0-2.6 GeV. © 1982.

Published
1982
Full Text
View/download PDF

16. An experiment oon CP violation in a high magnetic field

Author

D.G. Miller, W. G. Jones, David Ja Cockerill, N.C. Debenham, R.T. Elliot, J. Hiddleston, W.M. Evans, A. Maki, D. M. Binnie, P.S. Flower, D. Quarrie, J. Carr, D.P. Jones, and T. C. Bacon

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, High Energy Physics::Phenomenology, CP violation, Solenoid, Critical magnetic field, Magnetic field
Abstract

Salam and Strathdee have suggested that a critical magnetic field exists above which CP violation ceases. An experiment to look for such an effect using a pulsed solenoid gives a negative result at 21 T.

Published
1979
Full Text
View/download PDF

17. First measurement of the total width of the η′ (958) meson

Author

J. Keyne, N.C. Debenham, N.H. Sarma, W. G. Jones, D. M. Binnie, J. Carr, and H. Karami

Subjects
Quark, Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Meson, Branching fraction, High Energy Physics::Experiment, Charge (physics), Mixing (physics)
Abstract

In a high-resolution missing mass experiment the total width of the η′ (958) meson has been measured to be 0.28 ± 0.10 MeV. Using the known γγ branching ratio the value Γ ( η ′ → γγ ) = 5.4 ± 2.1 keV is deduced. This is in good agreement with calculations based on fractional charge quarks and a pseudo-scalar mixing angle of 11°.

Published
1979
Full Text
View/download PDF

18. Evidence for a spin-1 gluon in three-jet events

Author

T. R. Wyatt, U. Kötz, John Freeman, M. Ogg, D. G. Cassel, B. Löhr, P. Joos, B. Foster, D. A. Garbutt, Walter Dr. Hillen, E. Wicklund, P. Mättig, G. Peise, Ehud Duchovni, H. Boerner, H. Hultschig, J. Pyrlik, Rj Cashmore, C. Youngman, D. Trines, T. Barklow, H. G. Sander, P. Lecomte, B. H. Wiik, John Hart, E. Hilger, Sau Lan Wu, D. R. Quarrie, S. Yarker, W. Wallraff, Hermann Kolanoski, J. K. Sedgbeer, H. M. Fischer, O. Römer, U. Karshon, M. Wollstadt, R. Brandelik, D. M. Binnie, J. Proudfoot, H. L. Lynch, M. A. Downie, V. Kadansky, A. Schultz von Dratzig, E.E. Ronat, P. Koehler, D. Notz, A. Shapira, L. Koepke, D. Pandoulas, Georg Zobernig, G. Knop, W. Koch, Norbert Wermes, H. Kowalski, I. C. Brock, K. Lübelsmeyer, R. A. Stern, P. Söding, M. Holder, R. Rüsch, K. Gather, Y. Eisenberg, G. Poelz, G. Rudolph, R. Riethmüller, K. W. Bell, W. Braunschweig, D. Lüke, D. H. Saxon, R.C.E. Devenish, Gy. Wolf, R. Wedemeyer, F. J. Kirschfink, G. Mikenberg, P. Schmüser, J. Rimkus, P. Grossmann, Stephen Lloyd, H. Hartmann, H. Burkhardt, B. Roe, W. G. Jones, I. Al-Agil, John Illingworth, P. Leu, P. L. Woodworth, Roger Barlow, M. Schliwa, D. Heyland, D.W. Schmitz, D. Revel, Gl Salmon, T. Meyer, P. J. Dornan, A. Ladage, R. Fohrmann, and H. U. Martyn

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, High Energy Physics::Experiment, Kinematics, Nuclear Experiment, Confidence interval, Standard deviation, Gluon
Abstract

High-energy e+e--annihilation events obtained in the TASSO detector at PETRA have been used to determine the spin of the gluon in the reaction e+e- → qqg. We analysed angular correlations between the three jet axes. While vector gluons are consistent with the data (55% confidence limit), scalar gluons are disfavoured by 3.8 standard deviations, corresponding to a confidence level of about 10-4. Our conclusion is free of possible biases due to uncertainties in the fragmentation process or in determining the qqg kinematics from the observed hadrons. © 1980.

Published
1980
Full Text
View/download PDF

19. Energy scan for narrow states in e+e− annihilation at C.M. energies between 29.90 and 31.46 GeV

Author

J. Ringel, P. Schmüser, Gl Salmon, E.E. Ronat, W. Wallraff, M. Wollstadt, D. Pandoulas, T. Meyer, G. Knop, W. G. Jones, John Illingworth, A. Ladage, V. Kadansky, H. L. Lynch, P. L. Woodworth, A. Schultz von Dratzig, John Freeman, J. Rimkus, M. Ogg, K. W. Bell, H. Kowalski, W. Koch, R. Rüsch, C. Youngman, U. Karshon, H. M. Fischer, R. Riethmüller, H. Boerner, G. Poelz, N. A. Downie, Rj Cashmore, H. Hultschig, B. H. Wiik, John Hart, W. Chinowsky, D. M. Binnie, J. Proudfoot, Sau Lan Wu, Georg Zobernig, S. Yanker, P. Leu, Gy. Wolf, D. H. Saxon, P. Mättig, H. G. Sander, A. Shapira, B. Roe, O. Römer, H. Hartmann, D. R. Quarrie, D. Revel, Roger Barlow, M. Schliwa, Norbert Wermes, D. Lüke, Stephen Lloyd, B. Löhr, G. Mikenberg, J. Pyrlik, D. Heyland, P. Joos, B. Foster, D.W. Schmitz, D. G. Cassel, P. Koehler, P. J. Dornan, R. Wedemeyer, D. Notz, R. Fohrmann, K. Lübelsmeyer, P. Söding, Y. Eisenberg, W. Braunschweig, P. Lecomte, U. Kötz, D. A. Garbutt, E. Hilger, R. Brandelik, M. Holder, K. Gather, H. U. Martyn, D. Trines, J. K. Sedgbeer, Walter Dr. Hillen, and G. Peise

Subjects
Nuclear physics, Physics, Hadronic decay, Nuclear and High Energy Physics, Particle physics, Annihilation, Branching fraction, Electron–positron annihilation, ddc:530, High Energy Physics::Experiment, State (functional analysis), Energy (signal processing)
Abstract

A fine energy scan has been performed to search for narrow states in e+e- annihilation at c.m. energies between 29.90 and 31.46 GeV. No such state has been observed. The 90% confidence upper limit on the leptonic decay width times the hadronic decay branching ratio is ΓeeBh

Published
1979
Full Text
View/download PDF

20. Observation of F meson production in high energy e+e− annihilation

Author

W. Schütte, D. K. Hasell, Fernando Barreiro, P. Mättig, Y. Eisenberg, M. Mermikides, D. Revel, Joseph Izen, C. Youngman, J. McCardle, Rj Cashmore, R. Mir, M. Holder, H. Hultschig, T. Barklow, H. M. Fischer, H. Kück, Georg Zobernig, B. H. Wiik, T. D. Jones, John Hart, V. Mertens, L. Köpke, H. Hartmann, M. Cherney, A. Jocksch, D. R. Quarrie, Sau Lan Wu, H. G. Sander, P. J. Dornan, H. Kowalski, G. Baranko, Ch. Xiao, W. Wallraff, Philip Bull, H. U. Martyn, J. Thomas, J. Harvey, J. Proudfoot, W. A. T. Wan Abdullah, D. M. Binnie, M. G. Bowler, R. Wedemeyer, D.W. Schmitz, D. H. Saxon, C. Jenkins, M. Althoff, D. Notz, Giora Mikenberg, E.E. Ronat, R. Beuselinck, M. Wollstadt, G. Knop, Gl Salmon, Walter Dr. Hillen, P. Grossmann, G. E. Forden, P. E. L. Clarke, G. Peise, P. Joos, U. Kötz, B. Foster, Hermann Kolanoski, W. Koch, T. Kracht, A. J. Campbell, D. A. Garbutt, W. G. Jones, E. Wicklund, A. Ladage, F. J. Kirschfink, G. Poelz, R. Fohrmann, D. Trines, K. W. Bell, R.C.E. Devenish, D. Strom, Gy. Wolf, M. Rushton, P. Leu, G. Rudolph, P. L. Woodworth, B. Löhr, Hl Krasemann, J. Rimkus, D. Lüke, H. Venkataramania, E. Hilger, P. Rosskamp, D. Pandoulas, J. Pyrlik, H. Siebke, T. R. Wyatt, J. Sedgbeer, Norbert Wermes, E. Lohrmann, A. Shapira, Michael Dittmar, K. Gather, G. Yekutieli, A. Caldwell, Stephen Lloyd, K. Lübelsmeyer, Ehud Duchovni, W. Braunschweig, C. M. Hawkes, U. Karshon, R. J. Nowak, and B. Neumann

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, High energy, Meson production, Pair production, Annihilation, Meson, Branching fraction, Electron–positron annihilation, Yield (chemistry)
Abstract

Production of the F meson by e + e − annihilation at high energies has been obsrved in the ϕπ final state with a mass of 1.975 ± 0.009 ± 0.010 GeV and a width consistent with the mass resolution. The yield of F production times branching ratio relative to μ pair production is R F ( x ⩾ 0.3) B (F ± → ϕπ ± ) = 0.061 ± 0.012 ± 0.018.

Published
1984
Full Text
View/download PDF

21. Searches for fractional electric charge on niobium samples exposed to liquid helium

Author

W. G. Jones, P.F. Smith, H.E. Walford, G.J. Homer, and J.D. Lewin

Subjects
Physics, Nuclear and High Energy Physics, Liquid helium, Niobium, chemistry.chemical_element, Charge (physics), Electric charge, law.invention, Ion, Nuclear magnetic resonance, chemistry, law, Electric field, Levitation, Atomic physics, Lambda point refrigerator
Abstract

Levitation measurements at room temperature described in a previous paper did not confirm the apparent fractional electric charges reported by the Stanford Group for niobium samples at liquid helium temperature. To simulate possible effects of a low-temperature environment, both niobium and steel samples have been exposed to liquid helium for periods of typically 48 h, both with and without the assistance of electric fields to extract possible fractionally charged ions. Subsequent levitation tests show no indication of fractional charge. With some additional assumptions regarding ionic mobility and surface energy, an upper limit ∼10−2 fractional charges/g is inferred for the liquid helium itself.

Published
1986
Full Text
View/download PDF

22. A2− production in the channel π+π−π− near threshold

Author

D. M. Binnie, P.J. Nicholson, I. Siotis, A. Duane, R. George, J.G. McEwen, I.F. Burton, A.R. Faruqi, S.G.F. Frank, M. Lewis, W. G. Jones, J.G. Wilson, P.N. Upadhyay, L. Camilleri, Maksudul Haque, M.E. kay, and D. A. Garbutt

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Near threshold, Meson, Mass spectrum, Atomic physics, Resonance (chemistry)
Abstract

The mass spectrum of the A2 meson has been studied in the reaction π− + p → A2− + p, A2− → π+π−π − near threshold over a range of four-momentum transfer from −0.2 to −0.9 (GeVc)2. No significant evidence for any structure within the resonance has been found.

Published
1971
Full Text
View/download PDF

23. Measurement of the partial width of the decay φ → e+ + e−

Author

A. Duane, P.J. Nicholson, D.C. Mason, W. G. Jones, P. Palit, D. M. Binnie, I.U. Rahman, J.P. Horsey, J. Walters, A.R. Faruqi, M.E. kay, and J.G. Wilson

Subjects
Physics, Coupling constant, Nuclear and High Energy Physics, Pion, Partial width, Positron, Branching fraction, Analytical chemistry, Neutron, Elementary particle, Electron, Atomic physics
Abstract

Evidence is presented for the process π− + p→φ + n followed by φ → e+ + e−. The branching ratio (φ→ e + + e − ) (φ→ total ) is found to be (7.2 ± 3.9) × 10−4, corresponding to a partial width for φ→e+ + e− of 2.4 ± 1.5 keV/c2 and a coupling constant γ φ 2 4π of 1.9−0.7+2.9.

Published
1968
Full Text
View/download PDF

24. Meson mass spectrum near the X0 (958)

Author

I.F. Burton, P.N. Upadhyay, D. M. Binnie, W. G. Jones, L. Camilleri, I. Siotis, J. Keyne, J.R. Holmes, M. Lewis, D. A. Garbutt, J.G. McEwen, and A. Duane

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Near threshold, Meson, Mass spectrum, Atomic physics, Spectral line
Abstract

The meson mass spectrum near the X 0 (958) has been studied in the reaction π − + p → missing mass + n near threshold. A single peak, consistent with the X 0 , is seen. The mass obtained is 957.1 ± 0.45 MeV and the width is less than 1.9 MeV(95% C.L.).

Published
1972
Full Text
View/download PDF

25. Measurements of scintillation efficiency and pulse shape for low energy recoils in liquid xenon

Author

W. G. Jones, A. Bewick, T. J. Sumner, J. E. McMillan, T. B. Lawson, C. K. Ward, D. Akimov, D. C. R. Davidge, M. K. Joshi, I. Liubarsky, Daniel Tovey, Matthew J. Lehner, V. A. Kudryavtsev, N. J. C. Spooner, A. S. Howard, R. Lüscher, J. J. Quenby, C.D. Peak, I. Ivaniouchenkov, P. K. Lightfoot, J. V. Dawson, and V. N. Lebedenko

Subjects
Particle physics, Nuclear and High Energy Physics, Quenching factor, Physics::Instrumentation and Detectors, WIMP, chemistry.chemical_element, FOS: Physical sciences, Electron, Astronomy & Astrophysics, Scintillator, Physics, Particles & Fields, High Energy Physics - Experiment, Nuclear physics, LIMITS, High Energy Physics - Experiment (hep-ex), 0202 Atomic, Molecular, Nuclear, Particle And Plasma Physics, Recoil, Xenon, NUCLEAR RECOIL, Dark matter, Nuclear Experiment, DETECTOR, Physics, Scintillation, Range (particle radiation), Science & Technology, hep-ex, Double exponential function, Pulse shape, DARK-MATTER SEARCHES, NAI CRYSTAL, NAI(TL), Nuclear & Particles Physics, Exponential function, SODIUM, Physics, Nuclear, chemistry, DISCRIMINATION, Physical Sciences, Liquid xenon, BOULBY-MINE
Abstract

Results of observations of low energy nuclear and electron recoil events in liquid xenon scintillator detectors are given. The relative scintillation efficiency for nuclear recoils is 0.22 +/- 0.01 in the recoil energy range 40 keV - 70 keV. Under the assumption of a single dominant decay component to the scintillation pulse-shape the log-normal mean parameter T0 of the maximum likelihood estimator of the decay time constant for 6 keV < Eee < 30 keV nuclear recoil events is equal to 21.0 ns +/- 0.5 ns. It is observed that for electron recoils T0 rises slowly with energy, having a value ~ 30 ns at Eee ~ 15 keV. Electron and nuclear recoil pulse-shapes are found to be well fitted by single exponential functions although some evidence is found for a double exponential form for the nuclear recoil pulse-shape., 11 pages, including 5 encapsulated postscript figures

Full Text
View/download PDF

26. EVIDENCE FOR PLANAR EVENTS IN E+E- ANNIHILATION AT HIGH-ENERGIES

Author

U. Karshon, A. Pevsner, J. Rimkus, R. Riethmüller, W. Wallraff, E. Kogan, Gl Salmon, T. Meyer, W. Chinowsky, O. Römer, J. Pyrlik, A. Ladage, Lan. Wu Sau, H. L. Lynch, H. U. Martyn, H. M. Fischer, W. Koch, E.E. Ronat, V. Kadansky, A. Shapira, A. Schultz von Dratzig, R. Buhring, G. Poelz, R. Rüsch, Norbert Wermes, Stephen Lloyd, W. Rühmer, P. Lecomte, Roger Barlow, Gy. Wolf, M. Schliwa, K. W. Bell, H. Boerner, C. Youngman, H. Hartmann, W. G. Jones, G. Knop, D. M. Binnie, Georg Zobernig, John Illingworth, R. Wedemeyer, P. L. Woodworth, P. Schmüser, N. A. Downie, Walter Dr. Hillen, D. Revel, D. H. Saxon, G. Peise, K. Lübelsmeyer, P. Söding, J. Ringel, Y. Eisenberg, H. G. Sander, F. Roth, W. Braunschweig, H. Hultschig, B. H. Wiik, S. Yarker, John Hart, D. Notz, P. Mättig, D. R. Quarrie, Rj Cashmore, B. Löhr, J. Proudfoot, P. Joos, B. Foster, D. Lüke, G. Mikenberg, D. Heyland, D.W. Schmitz, P. J. Dornan, M. Holder, K. Gather, H. Kowalski, John Freeman, R. Fohrmann, M. Wollstadt, M. Ogg, J. K. Sedgebeer, W. Korbach, P. Leu, D. Pandoulas, U. Kötz, D. A. Garbutt, E. Hilger, R. Brandelik, and D. Trines

Subjects
Physics, Quark, Nuclear and High Energy Physics, Particle physics, Annihilation, Electron–positron annihilation, Astrophysics::High Energy Astrophysical Phenomena, Hadron, High Energy Physics::Phenomenology, Nuclear Theory, Elementary particle, Jet (particle physics), Gluon, Nuclear physics, Transverse plane, High Energy Physics::Experiment, Nuclear Experiment
Abstract

Hadron jets produced in e+e− annihilation between 13 GeV and 31.6 GeV in c.m. at PETRA are analyzed. The transverse momentum of the jets is found to increase strongly with c.m. energy. The broadening of the jets is not uniform in azimuthal angle around the quark direction but tends to yield planar events with large and growing transverse momenta in the plane and smaller transverse momenta normal to the plane. The simple q q collinear jet picture is ruled out. The observation of planar events shows that there are three basic particles in the final state. Indeed, several events with three well-separated jets of hadrons are observed at the highest energies. This occurs naturally when the outgoing quark radiates a hard noncollinear gluon, i.e., e + e − → q q g with the quarks and the gluons fragmenting into hadrons with limited transverse momenta.

Published
1979

27. π0 production by e+e- annihilation at 14 and 34 GeV c.m. energy

Author

Hl Krasemann, W. G. Jones, M. Holder, K. Gather, D Pandoulas, G. Mikenberg, T. Barklow, E.E. Ronat, D. Trines, G. Knop, P. Grossmann, Juergen Thomas, B. Foster, J. Sedgbeer, W. Wallraff, Hermann Kolanoski, T. D. Jones, H. Hultschig, B. H. Wiik, John Hart, R.C.E. Devenish, P. J. Dornan, Gl Salmon, D. Notz, R. Wedemeyer, T. R. Wyatt, Norbert Wermes, S. L. Wu, T. Meyer, R. J. Cashmore, Ehud Duchovni, M. G. Bowler, U. Kötz, D. Lüke, Y. Eisenberg, D. A. Garbutt, Walter Dr. Hillen, F. J. Kirschfink, G. Peise, A. Ladage, W. Braunschweig, C. Youngman, H. Hartmann, H. Boerner, P. Leu, W. Koch, L. Köpke, J. Proudfoot, R. Beuselinck, E. Hilger, D. Heyland, H. G. Sander, K. Lübelsmeyer, D.W. Schmitz, A. Shapira, P. Söding, Quarrie, G. Poelz, R. Brandelik, A. J. Campbell, R. Fohrmann, D. Revel, I. C. Brock, K. H. Mess, O. Römer, John Freeman, M. Ogg, G. Rudolph, P. Joos, E. Wicklund, I. Al-Agil, U. Karshon, Gy. Wolf, H. Burkhardt, P. Schmüser, RA Stern, J. Pyrlik, H. Kowalski, D. H. Saxon, Sl Lloyd, R. Riethmüller, S. Cooper, M. Wollstadt, H. U. Martyn, D. M. Binnie, J. Rimkus, John Illingworth, P. L. Woodworth, H. L. Lynch, K. W. Bell, S Yarker, P. Mättig, AS von Dratzig, H. M. Fischer, and Georg Zobernig

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Production (computer science), Energy (signal processing), Lower energy
Abstract

The process e+e-→ π0 + anything has been measured at c.m. energies of 14 and 34 GeV for π0 energies between 0.5 and 4 GeV. The ratio of π0 to π± production for π momenta between 0.5 and 1.5 GeV/c is measured to be 2σ(π0)/ [σ(π+) + σ(π-)] = 1.3 ± 0.4 (1.2 ± 0.4) at 14 (34) GeV. The scaled cross section (s/μ)dσ/dx when compared with lower energy (4.9-7.4 GeV) π0 data indicates a substantial scaling violation. © 1982.

Published
1982

28. COMPARISON OF E+E- ANNIHILATION WITH QCD AND DETERMINATION OF THE STRONG COUPLING-CONSTANT

Author

V. Kadansky, D. Trines, R. Rüsch, D. Lüke, H. L. Lynch, G. Mikenberg, A. Schultz von Dratzig, H. G. Sander, H. Kowalski, D. G. Cassel, W. G. Jones, M. Holder, K. Gather, J. Pyrlik, P. Grossmann, D. Heyland, W. Wallraff, H. Hartmann, O. Römer, D.W. Schmitz, M. Wollstadt, B. Roe, John Freeman, E.E. Ronat, Gl Salmon, Kw Bell, Gy. Wolf, Walter Dr. Hillen, John Illingworth, B. Foster, G. Peise, N. A. Downie, P. L. Woodworth, M. Ogg, Rj Cashmore, G. Knop, D. Revel, P. Schmüser, J. Sedgbeer, R. Fohrmann, H. Boerner, T. Meyer, J. Rimkus, H. M. Fischer, J. Proudfoot, S. Yarker, H. Hultschig, H. Burkhardt, A. Ladage, N Wermes, L. Koepke, B. H. Wiik, B. Löhr, R. Riethmüller, T. R. Wyatt, P. Joos, A. Shapira, I. C. Brock, Sau Lan Wu, P. J. Dornan, P. Koehler, R. Wedemeyer, G Zobernig, P. Leu, P. Mättig, D. Notz, D. R. Quarrie, Roger Barlow, M. Schliwa, D. H. Saxon, Y. Eisenberg, C. Youngman, U. Karshon, J. C. Hart, D. Pandoulas, Stephen Lloyd, D. M. Binnie, Hu Martyn, W. Braunschweig, P. Lecomte, R.C.E. Devenish, W. Koch, G. Poelz, K. Lübelsmeyer, P. Söding, U. Kötz, D. A. Garbutt, E. Hilger, and R. Brandelik

Subjects
Coupling constant, Quantum chromodynamics, Quark, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Gluon, Nuclear physics, Fragmentation (mass spectrometry), High Energy Physics::Experiment, Nuclear Experiment
Abstract

We have analyzed 1113 events of the reaction e+e− → hadrons at CM energies of 12 and 30 GeV in order to make a detailed comparison with QCD. Perturbative effects can be well separated from effects depending on the quark and gluon fragmentation parameters to yield a reliable measurement of the coupling constant αS. At 30 GeV, the result is αS = 0.17 ± 0.02 (statistical) ± 0.03 (systematic). QCD model predictions, using the fragmentation parameters determined along with αS, agree with both gross properties of the final states and with detailed features of the three-jet states.

Published
1980

29. PRODUCTION AND PROPERTIES OF THE TAU-LEPTON IN E+E- ANNIHILATION AT CM ENERGIES FROM 12-GEV TO 31.6-GEV

Author

H. M. Fischer, W. Wallraff, M. Holder, K. Gather, Georg Zobernig, Gl Salmon, I. C. Brock, W. Koch, P. Lecomte, D. Trines, D. H. Saxon, T. Meyer, G. Poelz, P. Koehler, D. Pandoulas, P. Mättig, Y. Eisenberg, N. A. Downie, Stephen Lloyd, J. K. Sedgbeer, A. Ladage, D. Lüke, W. Braunschweig, R. Riethmüller, Walter Dr. Hillen, Rj Cashmore, G. Peise, B. Roe, O. Römer, J. Pyrlik, R.C.E. Devenish, G. Mikenberg, D. G. Cassel, H. Hartmann, Roger Barlow, M. Schliwa, S. Yarker, D. R. Quarrie, D. Heyland, P. Grossmann, D. Revel, J. Proudfoot, H. L. Lynch, H. U. Martyn, A. Schultz von Dratzig, C. Youngman, T. R. Wyatt, D.W. Schmitz, P. Schmüser, M. Wollstadt, K. Lübelsmeyer, H. Boerner, K. W. Bell, John Freeman, M. Ogg, P. J. Dornan, P. Söding, V. Kadansky, H. Kowalski, D. Notz, U. Karshon, E. Hilger, R. Rüsch, R. Wedemeyer, B. Löhr, Gy. Wolf, R. Fohrmann, P. Joos, R. Brandelik, B. Foster, U. Kötz, P. Leu, D. A. Garbutt, H. Hultschig, B. H. Wiik, John Hart, Sau Lan Wu, A. Shapira, E.E. Ronat, G. Knop, Norbert Wermes, D. M. Binnie, J. Rimkus, W. G. Jones, John Illingworth, P. L. Woodworth, and H. G. Sander

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Cutoff, High Energy Physics::Experiment, Lepton
Abstract

We have observed τ production in e+e- annihilation at centre-of-mass energies between 12 and 31.6 GeV with cross sections in agreement with the QED τ-pair cross section. Branching ratios for τ decay have been measured and are consistent with the world averages. We have determined the cutoff parameters of QED Λ+ (Λ-) to be > 73 GeV (82 GeV) and have obtained an upper limit on the τ lifetime of 1.4 × 10-12 s(95% CL). © 1980.

Published
1980

30. EVIDENCE FOR CHARGED PRIMARY PARTONS IN E+E--]2 JETS

Author

W. G. Jones, M. Holder, K. Gather, E.E. Ronat, P. Grossmann, G. Knop, D. Trines, D. G. Cassel, R. A. Stern, U. Kötz, H. L. Lynch, B. Foster, J. Sedgbeer, D. A. Garbutt, D. Lüke, E. Hilger, Walter Dr. Hillen, P. Mättig, W. Braunschweig, Hermann Kolanoski, H. G. Sander, G. Mikenberg, A. Schultz von Dratzig, D. Heyland, R. Wedemeyer, G. Peise, D.W. Schmitz, Gl Salmon, F. J. Kirschfink, P. Koehler, R. Brandelik, T. Barklow, T. Meyer, I. Al-Agil, D. R. Quarrie, T. R. Wyatt, H. Hultschig, V. Kadansky, John Freeman, R. Riethmüller, B. H. Wiik, H. M. Fischer, Ehud Duchovni, D. Notz, P. Lecomte, S. Yarker, L. Koepke, Sau Lan Wu, John Illingworth, P. J. Dornan, M. Ogg, D. Revel, Kw Bell, M. Wollstadt, R. Beuselink, R. Fohrmann, O. Römer, P. Schmüser, H. Kowalski, R.C.E. Devenish, P. L. Woodworth, A. Ladage, R. Rüsch, I. C. Brock, G Zobernig, N Wermes, J. Rimkus, Y. Eisenberg, P. Leu, G. Rudolph, P. Joos, C. Youngman, Hu Martyn, H. Boerner, K. Lübelsmeyer, P. Söding, E. Wicklund, Rj Cashmore, D. H. Saxon, H. Hartmann, D. Pandoulas, J. C. Hart, J. Proudfoot, Sl Lloyd, A. Shapira, W. Wallraff, W. Koch, G. Poelz, Gy. Wolf, H. Burkhardt, U. Karshon, D. M. Binnie, and J. Pyrlik

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Primary (astronomy), Electron–positron annihilation, Parton
Published
1981

31. SEARCH FOR SPINLESS BOSONS IN E+E- ANNIHILATION

Author

P. Mättig, V. Mertens, D. Trines, H. U. Martyn, Hermann Kolanoski, J. K. Sedgbeer, W. A. T. Wan Abdullah, T. D. Jones, A. Ladage, H. Siebke, H. Hartmann, J. McCardle, P. E. L. Clarke, Y. Eisenberg, W. Braunschweig, T. Kracht, W. Schütte, Fernando Barreiro, K. W. Bell, D. Lüke, S. Ritz, K. Gather, P. Dauncey, B. Neumann, C. M. Hawkes, H. Kück, M. Dittmar, Boaz Klima, T. Tymieniecka, Gy. Wolf, R. Beuselinck, D.W. Schmitz, B. Löhr, U. Kötz, M. Althoff, D. Notz, Giora Mikenberg, G. Yekutieli, P. Joos, B. Foster, U. Karshon, R. Wedemeyer, P. J. Dornan, D. A. Garbutt, G. E. Forden, R. J. Nowak, E. Wicklund, G. Baranko, D. Pandoulas, K. U. Pösnecker, W. G. Jones, D. Strom, D. J. Mellor, R. Fohrmann, M. Takashima, R. Rosskamp, M. Rushton, H. Venkataramania, R.C.E. Devenish, G. Rudolph, J. Pyrlik, A. Shapira, P. Leu, E. Hilger, M. Mermikides, D. Revel, R. Mir, C. Jenkins, Rj Cashmore, P. Grossmann, H. Kowalski, G. Poelz, Wolfram Dietrich Zeuner, W. Wallraff, Philip Bull, G. Kreutz, J. Harvey, D. M. Binnie, M. Cherney, D. H. Saxon, J. Thomas, C. Youngman, A. Jocksch, M. G. Bowler, M. Holder, H. Hultschig, John Hart, Sau Lan Wu, F. J. Kirschfink, E.E. Ronat, S. Brandt, Hl Krasemann, G. Knop, E. Lohrmann, J. Eisenmann, H. M. Fischer, Georg Zobernig, D. K. Hasell, Joseph Izen, A. Caldwell, Stephen Lloyd, Ehud Duchovni, and A. Eskreys

Subjects
Physics, Quark, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Annihilation, Hadron, High Energy Physics::Phenomenology, law.invention, Nuclear physics, law, High Energy Physics::Experiment, Center of mass, Collider, Nuclear Experiment, Boson, Lepton
Abstract

We have measured the cross sections for e+e− → e+e−, e+e− → μ+μ−, e+e− → γγ and e+e− → hadrons in an energy scan at center of mass energies between 39.79 and 46.72 GeV in 30 MeV steps. New spinless bosons, whose existence has been postulated as a possible means to explain the anomalously large radiative width of the Z0 found at the CERN SPS p p collider, are ruled out in the scan region. The data are used to set limits on the couplings to lepton, photon and quark pairs of bosons with masses above 46.72 GeV.

Published
1985

32. K0-PRODUCTION IN E+E- ANNIHILATIONS AT 30 GEV CENTER OF MASS-ENERGY

Author

L. Koepke, H. Hultschig, Gl Salmon, B. H. Wiik, I. C. Brock, Sau Lan Wu, T. Meyer, J. Pyrlik, G Zobernig, W. Braunschweig, P. J. Dornan, M. Wollstadt, A. Ladage, P. Lecomte, Hu Martyn, P. Leu, Rj Cashmore, H. L. Lynch, U. Kötz, W. Koch, E.E. Ronat, G. Knop, A. Schultz von Dratzig, Kw Bell, B. Löhr, D. A. Garbutt, P. Schmüser, U. Karshon, O. Römer, G. Poelz, D. Trines, D. G. Cassel, R. Riethmüller, D. Lüke, H. Boerner, P. Joos, R.C.E. Devenish, D. Pandoulas, H. Kowalski, G. Mikenberg, B. Roe, K. Lübelsmeyer, P. Söding, P. Koehler, Gy. Wolf, R. Wedemeyer, E. Hilger, D. Heyland, P. Mättig, Y. Eisenberg, A. Shapira, D.W. Schmitz, C. Youngman, R. Brandelik, D. Notz, T. R. Wyatt, N Wermes, Roger Barlow, M. Schliwa, D. R. Quarrie, H. M. Fischer, D. H. Saxon, H. Burkhardt, N. A. Downie, J. Rimkus, R. Fohrmann, Walter Dr. Hillen, G. Peise, J. C. Hart, Sl Lloyd, S. Yarker, D. Revel, W. Wallraff, B. Foster, John Illingworth, P. L. Woodworth, D. M. Binnie, J. Sedgbeer, H. Hartmann, J. Proudfoot, V. Kadansky, H. G. Sander, John Freeman, M. Ogg, R. Rüsch, P. Grossmann, W. G. Jones, M. Holder, and K. Gather

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Production (computer science), Center of mass, Scaling, Energy (signal processing)
Abstract

Inclusive K0-production has been measured in e+e- annihilation at a center of mass energy of about W = 30 GeV. The ratio of K0 + K0 production to μ+μ- production is RK0 = 5.6 ± 1.1 (statist. error) ± 0.8 (system.error) This value is about a factor of three higher than RK0 at W = 7 GeV. The cross sections (s/β) dσ/dx is consistent with a scaling behaviour.

Published
1980

33. Charge asymmetry and weak interaction effects in e+e-→μ+μ- and e+e-→τ+τ

Author

M. Wollstadt, J. Pyrlik, H. Hultschig, K. H. Mess, B. H. Wiik, Norbert Wermes, H. L. Lynch, E. Hilger, R. Brandelik, Sau Lan Wu, P. J. Dornan, Ehud Duchovni, W. G. Jones, M. Holder, K. Gather, J. Rimkus, Gl Salmon, H. U. Martyn, D. H. Saxon, K. W. Bell, R.C.E. Devenish, U. Kötz, D. A. Garbutt, C. Youngman, T. Meyer, D. R. Quarrie, Walter Dr. Hillen, D. Notz, E.E. Ronat, D. Heyland, B. Foster, J. Sedgbeer, G. Peise, K. Lübelsmeyer, P. Söding, John Freeman, M. Ogg, P. Schmüser, O. Römer, G. Knop, J. C. Hart, Sl Lloyd, A. Ladage, D.W. Schmitz, D. M. Binnie, Juergen Thomas, A. Shapira, S Yarker, W. Koch, A. J. Campbell, S. Cooper, R. Riethmüller, I. C. Brock, Rj Cashmore, G. Poelz, H. M. Fischer, Y. Eisenberg, Giora Mikenberg, W. Braunschweig, H. Hartmann, R. Fohrmann, P. Grossmann, W. Wallraff, M. G. Bowler, F. J. Kirschfink, G. Rudolph, Georg Zobernig, D. Trines, J. Proudfoot, John Illingworth, P. L. Woodworth, J. Harvey, T. D. Jones, R. Wedemeyer, D. Pandoulas, T. Barklow, Hermann Kolanoski, P. Mättig, H. Boerner, R. Beuselinck, P. Leu, Hl Krasemann, B. Löhr, T. R. Wyatt, P. Joos, D. Lüke, E. Wicklund, H. Kowalski, L. Köpke, H. G. Sander, I. Al-Agil, U. Karshon, R. Carnegie, H. Burkhardt, D. Revel, Gy. Wolf, and RA Stern

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Neutral current, Coupling strength, Electron–positron annihilation, media_common.quotation_subject, Analytical chemistry, Charge (physics), Weak interaction, Asymmetry, Pseudovector, media_common
Abstract

We have measured, at an average centre-of-mass energy of 34.22 GeV a forward-backward charge asymmetry in the reaction e + e − → μ + μ − of value −0.161 ± 0.032. This demonstrates the existence of an axial vector neutral current with coupling strength of g e a g μ a =0.53 ± 0.10. We have also obtained a limit on the vector coupling strength of g e v g μ v 2 θ W =0.29 +0.09 −0.11 . From the reaction e + e − → τ + τ − we have found g e a g τ a g e v g τ v

Published
1982

34. SCALE BREAKING IN INCLUSIVE CHARGED-PARTICLE PRODUCTION BY E+E- ANNIHILATION

Author

J. Pyrlik, Walter Dr. Hillen, G. Peise, D. Heyland, D.W. Schmitz, K. Lübelsmeyer, P. Söding, Rj Cashmore, A. J. Campbell, S Yarker, E. Hilger, E. Lohrmann, W. Braunschweig, W. Schütte, R. Fohrmann, B. Foster, J. Sedgbeer, G. Rudolph, T. D. Jones, R. Wedemeyer, R. Brandelik, D. Notz, M. G. Bowler, Gl Salmon, H. L. Lynch, M. Wollstadt, Kw Bell, P. Schmüser, T. Barklow, O. Römer, D. Revel, F. J. Kirschfink, B. Löhr, H. Kowalski, W. Koch, T. Meyer, H. Hultschig, D. M. Binnie, Ehud Duchovni, L. Köpke, B. H. Wiik, P. J. Dornan, P. Grossmann, I. C. Brock, Hl Krasemann, Y. Eisenberg, U. Kötz, G. Poelz, G Zobernig, John Illingworth, C. Youngman, A. Shapira, D. A. Garbutt, D. Trines, A. Ladage, S. L. Wu, W. G. Jones, P. Joos, R.C.E. Devenish, M. Holder, K. Gather, P. L. Woodworth, H. G. Sander, Hermann Kolanoski, E.E. Ronat, G. Knop, H. Hartmann, I. Al-Agil, E. Wicklund, K. H. Mess, H. Boerner, J. Proudfoot, S. Cooper, U. Karshon, J. Rimkus, R. Beuselinck, John Freeman, M. Ogg, N Wermes, R. Carnegie, H. M. Fischer, Juergen Thomas, P. Mättig, Gy. Wolf, D. H. Saxon, H. Burkhardt, RA Stern, J. Franzke, J. C. Hart, Sl Lloyd, W. Wallraff, J. Harvey, D. Pandoulas, R. Riethmüller, T. R. Wyatt, Hu Martyn, Quarrie, D. Lüke, G. Mikenberg, and P. Leu

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Cross section (physics), Transverse plane, Annihilation, Angular distribution, Scale (ratio), Electron–positron annihilation, Production (computer science), Charged particle
Abstract

The scale cross section s d σ d x p for inclusive charged-particle production in e+e− annihilation has been studied for c.m. energies W between 12.0 and 36.7 GeV. Scale breaking is observed. For xp>0.2 the cross section decreases by ≈20% when W increases from 14 to 35 GeV. The production angular distribution was used to separate the longitudinal and transverse cross-section contributions and to determine the ratio of the structure functions m W 1 and v W 2 .

Published
1982

35. TEST OF QED IN E+E- ANNIHILATION AT ENERGIES BETWEEN 12 AND 31.6 GEV

Author

J. Pyrlik, D. H. Saxon, K. Lüberlsmeyer, Gl Salmon, U. Kötz, P. Koehler, H. Burkhardt, P. Grossmann, J. C. Hart, D. Notz, Kw Bell, Sl Lloyd, D. A. Garbutt, P. Schmüser, T. Meyer, P. Leu, W. Wallraff, H. Hartmann, H. Hultschig, O. Römer, B. H. Wiik, A. Ladage, H. L. Lynch, Sau Lan Wu, P. J. Dornan, W. Koch, D. Pandoulas, A. Schultz von Dratzig, M. Wollstadt, J. Proudfoot, B. Foster, G. Piese, D. Heyland, G. Poelz, A. Shapira, J. Sedgbeer, W. G. Jones, V. Kadansky, M. Holder, Rj Cashmore, K. Gather, D.W. Schmitz, R. Riethmüller, D. G. Cassel, H. Boerner, R.C.E. Devenish, R. Rüsch, Hu Martyn, P. Söding, Y. Eisenberg, C. Youngman, R. Wedemeyer, W. Braunschweig, E.E. Ronat, D. M. Binnie, Roger Barlow, M. Schliwa, E. Hilger, R. Fohrmann, U. Karshon, G. Knop, Gy. Wolf, L. Koepke, P. Lecomte, John Illingworth, T. R. Wyatt, R. Brandelik, I. C. Brock, G Zobernig, P. L. Woodworth, D. Lüke, G. Mikenberg, N. A. Downie, H. Kowalski, H. M. Fischer, J. Rimkus, P. Mättig, D. R. Quarrie, Walter Dr. Hillen, S. Yarker, N Wermes, B. Roe, D. Trines, D. Revel, John Freeman, M. Ogg, B. Löhr, H. G. Sander, and P. Joos

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Weinberg angle
Abstract

We have measured the reactions e+e− → e+e− → μ+μ− and e+e− → γγ at c.m. energies between 12 and 31.6 GeV. Excellent agreement with the predictions of QED has been found, resulting in cut off parameters Λ+ > 112 GeV and Λ− > 139 GeV for the first process and Λ+ > 34 GeV and Λ− > 42 GeV (95% c.1.) for the last one. A limit on the Weinberg angle of sin2θW < 0.55 (95% c.1.) has been obtained.

Published
1980

36. HIGH PT HADRON-PRODUCTION IN PHOTON-PHOTON COLLISIONS

Author

H. M. Fischer, Y. Eisenberg, M. Wollstadt, U. Karshon, W. Braunschweig, Gl Salmon, T. Meyer, Georg Zobernig, J. Rimkus, M. Holder, A. Ladage, K. Gather, G. Mikenberg, R. Beuselinck, I. Al-Agil, P. Lecomte, J. Pyrlik, P. Joos, B. Foster, P. L. Woodwarth, H. Hartmann, O. Römer, E.E. Ronat, G. Rudolph, T. Barklow, D. Revel, E. Wicklund, G. Knop, D. Lüke, S. Cooper, L. Köpke, R. A. Stern, K. Lübelsmeyer, H. L. Lynch, P. Söding, H. Kowalski, P. Schmüser, Walter Dr. Hillen, G. Peise, P. Grossmann, A. Schultz von Dratzig, H. G. Sander, Hl Krasemann, D. R. Quarrie, R.C.E. Devenish, J. Proudfoot, K. W. Bell, P. Mättig, A. Shapira, F. J. Kirschfink, John Freeman, P. Leu, Juergen Thomas, D. Pandoulas, M. Ogg, S. Yarker, T. D. Jones, D. H. Saxon, H. Hultschig, B. H. Wiik, John Hart, Sau Lan Wu, D. Heyland, H. U. Martyn, R. Riethmüller, D.W. Schmitz, I. C. Brock, W. G. Jones, P. J. Dornan, Stephen Lloyd, A. J. Campbell, Gy. Wolf, K. H. Mess, R. Wedemeyer, John Illingworth, W. Koch, C. Youngman, R. Fohrmann, Ehud Duchovni, H. Boerner, G. Poelz, D. Notz, H. Burkhardt, R. Rüsch, T. R. Wyatt, D. Trines, M. G. Bowler, W. Wallraff, Hermann Kolanoski, J. K. Sedgbeer, E. Hilger, D. M. Binnie, R. Brandelik, Norbert Wermes, R. J. Cashmore, U. Kötz, and D. A. Garbutt

Subjects
Coupling, Nuclear physics, Quark, Physics, Nuclear and High Energy Physics, Particle physics, Transverse plane, Cross section (physics), Photon, Scattering, Hadron, High Energy Physics::Experiment, Storage ring
Abstract

We have studied the properties of hadron production in photon-photon scattering with tagged photons at the e+e- storage ring PETRA. A tail in the pT distribution of particles consistent with pT-4 has been observed. We show that this tail cannot be due to the hadronic part of the photon. Selected events with high pT particles are found to be consistent with a two-jet structure as expected from a point-like coupling of the photons to quarks. The lowest-order cross section predicted for γγ → qq, σ = 3 Σ eq4 · σγγ → μμ, is approached from above by the data at large transverse momenta. © 1981.

Published
1981

37. CHARGED PION, KAON, PROTON AND ANTIPROTON PRODUCTION IN HIGH-ENERGY E+E- ANNIHILATIONS

Author

R.C.E. Devenish, Walter Dr. Hillen, G. Peise, Gl Salmon, B. Roe, Rj Cashmore, H. M. Fischer, John Freeman, Gy. Wolf, W. Braunschweig, E. Hilger, S. Yarker, M. Ogg, D. Heyland, N. A. Downie, T. Meyer, D.W. Schmitz, A. Ladage, P. Lecomte, P. Grossmann, W. Wallraff, J. Pyrlik, H. Burkhardt, W. G. Jones, M. Holder, K. Gather, H. Hartmann, H. L. Lynch, D. Pandoulas, Roger Barlow, M. Schliwa, A. Schultz von Dratzig, E.E. Ronat, R. Brandelik, R. Wedemeyer, J. Proudfoot, Y. Eisenberg, G. Knop, D. Revel, C. Youngman, D. G. Cassel, Hu Martyn, K. Lübelsmeyer, L. Koepke, A. Shapira, H. Kowalski, B. Foster, P. Söding, J. Sedgbeer, I. C. Brock, G Zobernig, U. Karshon, W. Koch, U. Kötz, P. Koehler, D. A. Garbutt, G. Poelz, P. Mättig, D. Notz, H. G. Sander, V. Kadansky, O. Römer, Kw Bell, D. R. Quarrie, R. Fohrmann, D. Lüke, G. Mikenberg, D. Trines, R. Rüsch, P. Schmüser, R. Riethmüller, B. Löhr, P. Leu, P. Joos, H. Hultschig, Hermann Kolanoski, B. H. Wiik, H. Boerner, Sau Lan Wu, P. J. Dornan, N Wermes, D. H. Saxon, J. C. Hart, Sl Lloyd, D. M. Binnie, John Illingworth, T. R. Wyatt, P. L. Woodworth, M. Wollstadt, and J. Rimkus

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Proton, Nuclear Theory, Hadron, Nuclear physics, Baryon, Momentum, Time of flight, Pion, Antiproton, Yield (chemistry), High Energy Physics::Experiment, Nuclear Experiment
Abstract

Production of pions, kaons, protons and antiprotons has been studied in e + e − annihilations at 12 and 30 GeV centre of mass energy using time of flight techniques. The fractional yield of charged kaons and baryons appears to rise with outgoing particle momentum. At our highest energy at least 40% of e + e − annihilations into hadrons are estimated to contain baryons.

Published
1980

38. PROPERTIES OF HADRON FINAL-STATES IN E+E- ANNIHILATION AT 13 GEV AND 17 GEV CENTER OF MASS ENERGIES

Author

E.E. Ronat, H. Hartmann, G. Knop, Rj Cashmore, E. Hilger, J. Proudfoot, O. Römer, W. Rühmer, Gl Salmon, R. Brandelik, D. Heyland, D.W. Schmitz, T. Meyer, W. Wallraff, P. J. Dornan, Kadansky, R. Rüsch, J. Ringel, R. Buhring, U. Kötz, A. Ladage, Walter Dr. Hillen, J. Pyrlik, R. Fohrmann, D. A. Garbutt, G. Peise, H. M. Fischer, Stephen Lloyd, H. Kowalski, H. Hultschig, D. Pandoulas, F. Roth, B. H. Wiik, John Hart, D. M. Binnie, Georg Zobernig, Sau Lan Wu, P. Schmüser, B. Jaax, Roger Barlow, M. Schliwa, N. A. Downie, W. Korbach, Quarrie, D. H. Saxon, U. Karshon, M. Wollstadt, C. Youngman, D. Notz, Gy. Wolf, Norbert Wermes, R. Riethmüller, H. L. Lynch, W. Chinowsky, A. Schultz von Dratzig, K. W. Bell, D. Lüke, G. Mikenberg, R. Wedemeyer, D. Trines, J. Rimkus, H. Boerner, H. U. Martyn, John Freeman, E. Kogan, M. Ogg, W. G. Jones, John Illingworth, P. L. Woodworth, A. Shapira, K. Gather, B. Löhr, P. Joos, B. Foster, W. Koch, G. Poelz, K. Lübelsmeyer, P. Söding, P. Lecomte, Y. Eisenberg, W. Braunschweig, H. G. Sander, D. Revel, and 0 Pre-GFZ, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Electron–positron annihilation, Astrophysics::High Energy Astrophysical Phenomena, Quark model, Hadron, Elementary particle, 550 - Earth sciences, Jet (particle physics), Charged particle, Nuclear physics, High Energy Physics::Experiment, Center of mass, Nuclear Experiment
Abstract

We have observed e+e- hadrons at C.M. energies of 13 GeV and 17 GeV at PETRA using the TASSO detector. We find R(13 GeV) = 5.6 ± 0.7 and R(17 GeV) = 4.0 ± 0.7. The additional systematic uncertainty is 20%. Comparing inclusive charged hadron spectra we observe scaling between 5 GeV and 17 GeV for x = p/pbeam > 0.2; however the 13 GeV cross section is above the 17 GeV cross section for smaller x. This may be due to copious bb̄ production. The events become increasingly jet like at high energies as evidenced by a shrinking sphericity distribution with increasing energy. © 1979.

Published
1979

Catalog

Books, media, physical & digital resources
See catalog results