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1. CHARGED PION-PRODUCTION IN E+E- ANNIHILATION AT 14,22 AND 34 GEV CM ENERGY

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, Annihilation, Meson, Electron–positron annihilation, Astrophysics::High Energy Astrophysical Phenomena, Hadron, Nuclear Theory, Nuclear physics, Pion, High Energy Physics::Experiment, Nuclear Experiment, Energy (signal processing)
Abstract

The inclusive production of π ± mesons in e + e − annihilation has been measured at c.m. energies of 14, 22 and 34 GeV for pion momenta between 0.3 ans 10 GeV/ c . The fraction of pions among the charged hadrons is above 90% at 0.4 GeV/ c and decreases to about 50% at high momenta. The scaled cross sections ( s β ) d σ d x at 14, 22 and 34 GeV as well as the 5.2 GeV data from DASP have a rather similar x dependence. After integration over the x range from 0.2 to 0.6 the cross sections indicate a monotonic decrease with increasing centre-of-mass energy.

Published
2016

2. E+E- ANNIHILATION AT HIGH-ENERGIES AND SEARCH FOR THE T-QUARK CONTINUUM CONTRIBUTION

Author

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

Subjects
Physics, Nuclear physics, Top quark, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Nuclear fusion, High Energy Physics::Experiment, Continuum (set theory), Nuclear Experiment, Engineering (miscellaneous), Sphericity
Abstract

Measurements of R, sphericity and thrust are presented for c.m. energies between 12 and 31.6 GeV. A possible contribution of a t {Mathematical expression} continuum can be ruled out for c.m. energies between 16 and 31 GeV. © 1980 Springer-Verlag.

Published
2016

3. 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

4. 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

5. 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

6. Observation of hard processes in collisions of two quasi-real photons

Author

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

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, Photon, Angular distribution, Yield (chemistry), Hadron, High Energy Physics::Experiment, Electron, Nuclear Experiment, Term (time)
Abstract

Hard processes in photon-photon collisions are studied using high statistics data without requiring an electron tag. A high yield of hadrons with p t in the range 1.5–3.0 GeV/ c is observed. This yield exceeds the expectation of the Born term by a factor of four.

Published
1984

7. 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

8. 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

9. CHARGED HADRON COMPOSITION OF THE FINAL-STATE IN E+E- ANNIHILATION AT HIGH-ENERGIES

Author

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

Subjects
Physics, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, Hadron, Nuclear Theory, Elementary particle, Baryon, Nuclear physics, Pion, Antiproton, High Energy Physics::Experiment, Nuclear Experiment, Engineering (miscellaneous)
Abstract

The inclusive production of π± and K± mesons and of protons and antiprotons in e+e- annihilation has been measured at c.m. energies of W=14, 22 and 34GeV. Using time of flight measurements and Cerenkov counters the full momentum range has been covered. Differential cross sections and total particle yields are given. At particle momenta of 0.4 GeV/c more than 90% of the charged hadrons are pions. With increasing momentum the fraction of pions among the charged hadrons decreases. At W=34 GeV and a momentum of 5 GeV/c the particle fractions are approximately π±:K±:p, {Mathematical expression}. On average an event at W=34 GeV contains 10.3±0.4π±, 2.0±0.2 K± and 0.8±0.1 p, {Mathematical expression}. In addition, we present results on baryon correlations using a sample of events where two or more protons and/or antiprotons are observed in the final state. © 1983 Springer-Verlag.

Published
1983

10. 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

11. 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

12. 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

13. 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

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