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1. AN IMPROVED MEASUREMENT OF ELECTROWEAK COUPLINGS FROM E+E--]E+E- AND E+E--]MU+MU

Author

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

Subjects
Physics, Particle physics, Muon, Physics and Astronomy (miscellaneous), High Energy Physics::Phenomenology, Electroweak interaction, Elementary particle, Weinberg angle, Fermion, Nuclear physics, Pair production, High Energy Physics::Experiment, Engineering (miscellaneous), Bhabha scattering, Lepton
Abstract

We present an analysis of electroweak leptonic couplings from high statistics experiments on Bhabha scattering and μ pair production at an energy of 34.5 GeV. The forward-backward charge asymmetry of the μ pairs was measured to be −0.098±0.023±0.005. The data were found to agree well with the standard theory of electroweak interaction giving sin2θW=0.27±0.07. The leptonic weak couplings were determined to begv=0.000±0.170 andgA=−0.481±0.055. The data were also used to investigate a class of composite models for leptons.

Published
2016

2. A STUDY OF 3-JET EVENTS IN E+E- ANNIHILATION INTO HADRONS AT 34.6 GEV CM ENERGY

Author

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

Subjects
Physics, Quantum chromodynamics, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Astrophysics::High Energy Astrophysical Phenomena, Electron–positron annihilation, Nuclear Theory, Quark model, Hadron, Elementary particle, Gluon, Nuclear physics, Color model, High Energy Physics::Experiment, Nuclear Experiment, Engineering (miscellaneous)
Abstract

Three-jet events produced by e+e- annihilation into hadrons at 34.6 GeV c.m. energy were studied by comparing them with 2nd order QCD and two different models of fragmentation. The distribution of low energy particles in the 3-jet plane is found to be better described by the LUND color string model than by the independent jet model. The opposite is true for more energetic particles flowing between the 3 jets. The average transverse momenta in jets can be described with values of σq between 350 and 500 MeV/c for the gluon jet. © 1985 Springer-Verlag.

Published
2016

3. STRANGE MESON PRODUCTION IN E+E- ANNIHILATION

Author

Janusz Chwastowski, M. E. Veitch, B. Löhr, P. Joos, B. Foster, M. Takashima, D. H. Saxon, Eduardo Ros, R. J. Cashmore, Ian R Tomalin, P. Mättig, A. Leites, D. Muller, Fernando Barreiro, D. Strom, J. M. Pawlak, G. Poelz, A. Caldwell, John Hassard, A. Montag, J. Krüger, H. Hartmann, T. Kracht, J. Del Peso, D. Revel, K. Gather, G. Mikenberg, E. Hilger, D. Trines, A. Watson, R. Wedemeyer, D. Notz, H. M. Fischer, U. Karshon, Luis Hervas, D. Su, N. Wainer, Guenter Wolf, A. Ladage, A. J. Martin, Hermann Kolanoski, E. Lohrmann, J. Shulman, Georg Zobernig, Wolfram Dietrich Zeuner, K. U. Pösnecker, A. Shapira, A. Eskreys, L. Labarga, G. Yekutieli, Y. Eisenberg, R. Walczak, K. Genser, M. G. Bowler, W. Braunschweig, A. Jocksch, D. Lüke, S. Ritz, Philip Burrows, R. Gerhards, F. J. Kirschfink, M. Holder, H. Hultschig, John Hart, Sau Lan Wu, J. Fdez de Trocóniz, E.E. Ronat, G. Cases, Jens Hartmann, E. Bernardi, Stephanie Brandt, H. Kowalski, and H. U. Martyn

Subjects
Physics, Particle physics, Annihilation, Meson production, Physics and Astronomy (miscellaneous), Meson, Nuclear Theory, Multiplicity (mathematics), Sphericity, Nuclear physics, Rapidity, High Energy Physics::Experiment, Nuclear Experiment, Engineering (miscellaneous)
Abstract

The full TASSO data have been used to study the inclusive production of strange mesons in e+e- annihilations. Differential and total cross sections have been measured in the centre of mass energy range 14 to 44 GeV for K0, {Mathematical expression} and 34.5 to 44 GeV for K*± (892). We have investigated the strange meson production properties in jets by studying the rapidity and pt2 distributions as well as the evolution of the multiplicities as a function of the event sphericity. We find no evidence that the strange meson yields increase with increasing sphericity faster than the total charged multiplicity. © 1990 Springer-Verlag.

Published
2016

4. Angular correlations in γγ→ρ0ρ0 near threshold

Author

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

Subjects
Physics, Cross section (geometry), Nuclear physics, Particle physics, Range (particle radiation), Near threshold, Photon, Pion, Physics and Astronomy (miscellaneous), Partial wave analysis, Isotropy, Invariant mass, Engineering (miscellaneous)
Abstract

We present an analysis of ρ0ρ0 production by two photons in the ρ0ρ0 invariant mass range from 1.2 to 2.0 GeV. From a study of the angular correlations in the process γγ→ρ0ρ0→π- π+π- we exclude a dominant contribution from JP=0- or 2- states. The data indicate sizeable contributions from JP=0+ for four pion masses M4π1.7 GeV. The data are also well described by a model with isotropic production and uncorrelated isotropic decay of the ρ0,s. The cross section stays high below the nominal ρ0ρ0 threshold, i.e. M4π

Published
2016

5. MEASUREMENT OF THE PHOTON STRUCTURE-FUNCTION F2-GAMMA AT Q2 FROM 7 TO 70 (GEV/C)2

Author

W. Wallraff, Philip Bull, C. Jenkins, Rj Cashmore, H. M. Fischer, H. Venkataramania, R. Wedemeyer, Wolfram Dietrich Zeuner, A. Ladage, K. U. Pösnecker, D. Strom, E. Hilger, S. Ritz, A. Montag, G. Baranko, M. Cherney, D. H. Saxon, A. Shapira, J. Thomas, P. J. Dornan, A. Eskreys, L. Labarga, A. Jocksch, P. Mättig, J. Krüger, R. Mir, Michael Dittmar, Georg Zobernig, Walter Dr. Hillen, D. M. Binnie, D. Trines, B. Bock, G. Yekutieli, Giora Mikenberg, H. Hartmann, T. Kracht, P. D. Dauncey, T. Tymieniecka, Fernando Barreiro, M. G. Bowler, Hermann Kolanoski, J. K. Sedgbeer, D. A. Garbutt, K. Gather, R. Gerhards, E. Ros, D. Revel, H. Kück, Boaz Klima, E.E. Ronat, B. Neumann, A. Caldwell, Stephen Lloyd, D. K. Hasell, V. Mertens, Gy. Wolf, Joseph Izen, D. Lueke, M. Takashima, G. P. Heath, G. E. Forden, Hl Krasemann, B. Löhr, U. Karshon, P. Joos, B. Foster, E. Wicklund, E. Lohrmann, D. J. Mellor, Y. Eisenberg, R. Walczak, R.C.E. Devenish, J. Eisenmann, W. Braunschweig, M. Althoff, D. Notz, P. Rosskamp, F. J. Kirschfink, M. Holder, H. Hultschig, John Hart, Sau Lan Wu, G. Poelz, Stephanie Brandt, H. Kowalski, H. U. Martyn, W. G. Jones, D. Su, W. A. T. Wan Abdullah, and E. Bernardi

Subjects
Quantum chromodynamics, Quark, Physics, Particle physics, Photon, Physics and Astronomy (miscellaneous), High Energy Physics::Phenomenology, Hadron, Parton, Electron, Lambda, Photon structure function, Nuclear physics, High Energy Physics::Experiment, Nuclear Experiment, Engineering (miscellaneous)
Abstract

We have measured the processe + e −→e + e −+hadrons, where one of the scattered electrons was detected at large angles, withQ 2 ranging from 7 to 70 (VeV/c)2. The photon structure functionF 2 γ (x, Q2) was determined at an averageQ 2 of 23 (GeV/c)2. The measurements were compared to theoretical predictions of the Quark Parton Model and Quantum Chromodynamics. In both models a hadronic part was added. Within the errors the data are in agreement with the QPM using quark masses of 300 MeV/c2 for the light quarks. The data also agree with a QCD calculation including higher order corrections. A fit yielded a $$\Lambda _{\overline {MS} } $$ value of 140 −65 +190 MeV, where the errors include statistical and systematic uncertainties.

Published
2016

6. EVIDENCE FOR DIRECT PHOTONS FROM QUARKS IN ELECTRON-POSITRON ANNIHILATION

Author

A. J. Sephton, Y. Eisenberg, R. Walczak, G. E. Forden, B. Bock, W. Braunschweig, T. Kracht, K. U. Pösnecker, A. Shapira, D. Trines, W. Gerhardt, Janusz Chwastowski, J. F. Hassard, Giora Mikenberg, G. Tysarczyk, Stephanie Brandt, G. Yekutieli, Jens Hartmann, H. M. Fischer, A. J. Martin, I. R. Tomalin, Hermann Kolanoski, Fernando Barreiro, Wolfram Dietrich Zeuner, U. Karshon, H. Kowalski, A. Ladage, Georg Zobernig, E. Hilger, D. Su, M. E. Veitch, J. M. Pawlak, K. Gather, I. M. Silvester, P. Rehders, D. Muller, E. Lohrmann, P. Mättig, R. Wedemeyer, J. Shulman, E. Bernardi, H. U. Martyn, D. Revel, G. P. Heath, A. Montag, J. Del Peso, M. Takashima, Eduardo Ros, T. Tymieniecka, A. Eskreys, L. Labarga, Gy. Wolf, J. Krüger, H. Hartmann, Philip Burrows, D. Notz, D. Lüke, S. Ritz, B. Löhr, P. Joos, B. Foster, A. Leites, N. Wainer, D. H. Saxon, P. N. Ratoff, G. Poelz, K. Genser, M. G. Bowler, M. Holder, H. Hultschig, A. Jocksch, John Hart, Sau Lan Wu, R. Gerhards, F. J. Kirschfink, E.E. Ronat, C. Balkwill, and D. Strom

Subjects
Physics, Quark, Particle physics, Photon, Physics and Astronomy (miscellaneous), Astrophysics::High Energy Astrophysical Phenomena, media_common.quotation_subject, Electron–positron annihilation, Hadron, Bremsstrahlung, Jet (particle physics), Asymmetry, Nuclear physics, Positron, High Energy Physics::Experiment, Nuclear Experiment, Engineering (miscellaneous), media_common
Abstract

Hadronic events from e+e--annihilations with a high energy isolated photon have been investigated at C.M. energies between 14 GeV and 44 GeV. A forward-backward asymmetry Aγ of the positively charged jet with respect to the incident positron direction has been found:Aγγ=-0.32±0.07, providing evidence for photon bremsstrahlung from quarks. The forward-backward asymmetry of all hadronic events at C.M. energies between 30 GeV and 36 GeV has been measured. The value, corrected for the limited polar angle acceptance of the detector, is:A=+0.021±0.005. © 1988 Springer-Verlag.

Published
2016

7. GLOBAL JET PROPERTIES AT 14-44 GEV CENTER OF MASS-ENERGY IN E+E- ANNIHILATION

Author

D. H. Saxon, R. Gerhards, Rj Cashmore, B. Löhr, U. Karshon, P. Joos, Luis Hervas, B. Foster, Fernando Barreiro, E.E. Ronat, A. Caldwell, Eduardo Ros, H. Kowalski, M. Takashima, A. Ladage, A. Eskreys, M. Holder, H. Hultschig, Janusz Chwastowski, E. Lohrmann, D. Trines, John Hart, Sau Lan Wu, Philip Burrows, A. Jocksch, J. M. Pawlak, D. Notz, H. M. Fischer, N. Wainer, A. J. Martin, K. Genser, Stephanie Brandt, M. G. Bowler, J. Krüger, K. U. Pösnecker, R. Wedemeyer, H. Hartmann, D. Strom, H. U. Martyn, Hermann Kolanoski, F. J. Kirschfink, J. Shulman, Wolfram Dietrich Zeuner, Georg Zobernig, E. Hilger, D. Lüke, S. Ritz, Gy. Wolf, M. E. Veitch, Ian R Tomalin, P. Mättig, J. F. Hassard, D. Muller, G. Cases, E. Bernardi, Jens Hartmann, D. Su, D. Revel, A. Montag, J. Del Peso, Y. Eisenberg, R. Walczak, W. Braunschweig, and G. Poelz

Subjects
Physics, Jet (fluid), Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Hadron, Elementary particle, Charged particle, Nuclear physics, Momentum, High Energy Physics::Experiment, Center of mass, Nuclear Experiment, Engineering (miscellaneous)
Abstract

Jet properties ine + e − annihilation at center of mass energies of 14, 22, 35 and 43.7 GeV were studied with the data collected in the TASSO detector at PETRA, using the same evaluation procedures for all the energies. The total hadronic cross section ratio for the center of mass energy interval 39–47 GeV was determined to be ℛ=4.11±0.05 (stat)±0.18(syst.) at $$\langle \sqrt s \rangle = 43 - 7$$ GeV. Corrected distributions of global shape variables are presented as well as the inclusive charged particle distributions for scaled momentum and transverse momentum. The center of mass energy evolution of the average sphericity, thrust, aplanarity and particle momentum is shown.

Published
2016

8. 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

9. COMPARISON OF INCLUSIVE FRACTIONAL MOMENTUM DISTRIBUTIONS OF QUARK AND GLUON JETS PRODUCED IN E+E- ANNIHILATION

Author

H. Hartmann, M. Holder, Eduardo Ros, R. J. Cashmore, John Hart, D. Notz, Sau Lan Wu, M. Takashima, U. Karshon, Fernando Barreiro, G. Yekutieli, D. Trines, H. Kowalski, Janusz Chwastowski, E. Hilger, E.E. Ronat, H. Hulschig, B. Bock, Y. Eisenberg, E. Lohrmann, D. Strom, T. Kracht, R. Walczak, W. Braunschweig, D. Revel, G. Poelz, K. Genser, Hermann Kolanoski, E. Bernardi, Guenter Wolf, John Hassard, K. U. Pösnecker, Stephanie Brandt, A. Montag, Philip Burrows, K. Gather, J. Del Peso, J. Shulman, G. Mikenberg, H. M. Fischer, R. Gerhards, A. Ladage, H. U. Martyn, Jens Hartmann, A. J. Martin, J. M. Pawlak, Georg Zobernig, F. J. Kirschfink, D. Su, G. P. Heath, R. Wedemeyer, Wolfram Dietrich Zeuner, A. Eskreys, M. E. Veitch, Ian R Tomalin, P. Mättig, D. Muller, D. Lüke, S. Ritz, B. Löhr, P. Joos, B. Foster, A. Leites, A. Shapira, N. Wainer, M. G. Bowler, A. Jocksch, D. H. Saxon, and J. Krüger

Subjects
Quark, Physics, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, Hadron, Parton, Jet (particle physics), Charged particle, Gluon, Nuclear physics, Momentum, High Energy Physics::Experiment, Nuclear Experiment, Engineering (miscellaneous)
Abstract

Inclusive charged particle production ine + e − annihilation into hadrons is studied in terms of the particle fractional momentumx p . Thex p distribution for gluon jets is extracted by comparing two data samples measured in the TASSO detector: nearly symmetric three jet events at centre-of-mass energyW∼35 GeV and two jet events atW∼22 GeV, yielding quark and gluon jets of similar energies (∼11.5 GeV). No significant difference is observed between quark and gluon jets. Monte Carlo models based on parton showers describe the trend and energy variation of the data better than a model with second order matrix element in α s .

Published
2016

10. Measurement of the asymmetry ofb quark production ine + e − annihilation at $$\sqrt s = 35 GeV$$

Author

M. Takashima, Fernando Barreiro, J. M. Pawlak, G. Poelz, Eduardo Ros, E.E. Ronat, D. M. Binnie, R. J. Cashmore, A. Ladage, D. Trines, D. Revel, R. Wedemeyer, Philip Burrows, Jens Hartmann, H. U. Martyn, A. Montag, J. Krüger, Hermann Kolanoski, J. Del Peso, H. Hartmann, J. Shulman, Janusz Chwastowski, Guenter Wolf, A. Watson, E. Lohrmann, D. H. Saxon, B. Löhr, D. Muller, P. Joos, D. Notz, K. U. Pösnecker, M. E. Veitch, D. Su, B. Foster, D. Strom, Y. Eisenberg, Wolfram Dietrich Zeuner, F. J. Kirschfink, E. Hilger, R. Walczak, Ian R Tomalin, P. Mättig, M. Holder, W. Braunschweig, H. M. Fischer, H. Hultschig, A. J. Martin, John Hart, N. Wainer, Sau Lan Wu, Georg Zobernig, E. Bernardi, D. Lüke, S. Ritz, Stephanie Brandt, G. Cases, H. Kowalski, A. Eskreys, U. Karshon, Luis Hervas, A. Jocksch, K. Genser, M. G. Bowler, A. Caldwell, John Hassard, and R. Gerhards

Subjects
Coupling constant, Quark, Physics, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), media_common.quotation_subject, Asymmetry, Standard Model, Nuclear physics, Production (computer science), Engineering (miscellaneous), Pseudovector, media_common, Bar (unit)
Abstract

The forward-backward asymmetry in the reaction e+e-→bb has been determined at centre of mass energies near 35 GeV using the TASSO detector. We report results from three different methods. The combined result of the measurements is\(\overline A _b = - 0.21 \pm 0.08\) ignoring\(B^0 \bar B^0 \) mixing. Taking mixing into account leads to a corrected asymmetry of\(\overline {A_b^{cor} } = - 0.28 \pm 0.11\). The axial vector coupling constant of theb quark as calculated from the corrected asymmetry isab=−1.2±0.5 to be compared with the valueabSM=−1 from the standard model.

Published
1990

11. Experimental study of the orientation of three-jet events ine + e ? annihilation at PETRA

Author

D. Strom, R. Gerhards, E. Lohrmann, G. Yekutieli, H. Kowalski, A. Leites, K. Genser, Philip Burrows, T. Kracht, E.E. Ronat, M. G. Bowler, J. Körner, Stephanie Brandt, Jens Hartmann, K. U. Pösnecker, K. Gather, A. Ladage, Guenter Wolf, Wolfram Dietrich Zeuner, B. Löhr, H. M. Fischer, H. U. Martyn, G. Mikenberg, E. Hilger, A. J. Martin, P. Joos, B. Foster, Y. Eisenberg, R. Walczak, A. Jocksch, J. M. Pawlak, W. Braunschweig, D. Su, Fernando Barreiro, M. E. Veitch, J. Krüger, A. Shapira, M. Holder, Eduardo Ros, H. Hartmann, D. Revel, R. J. Cashmore, G. Cases, D. Muller, R. Wedemeyer, H. Hultschig, N. Wainer, John Hart, D. Lüke, S. Ritz, A. Montag, Sau Lan Wu, E. Bernardi, Janusz Chwastowski, J. Del Peso, A. Watson, G. Poelz, D. Notz, D. H. Saxon, Ian R Tomalin, P. Mättig, F. J. Kirschfink, M. Takashima, D. Trines, Hermann Kolanoski, J. Shulman, A. Eskreys, L. Labarga, A. Caldwell, John Hassard, U. Karshon, Luis Hervas, and Georg Zobernig

Subjects
Quantum chromodynamics, Physics, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Hadron, Elementary particle, Jet (particle physics), Nuclear physics, Azimuth, High Energy Physics::Experiment, Polar coordinate system, Engineering (miscellaneous), Lepton
Abstract

The full TASSO data have been used to study the orientation of three-jet events ine+e− annihilation. The polar angle distributions of the normal to the three-jet plane as well as the polar angle distribution of the most energetic jet have been measured as a function of the thrust cut-off used to select the three-jet sample. The data corrected for radiation and detector effects are compared to QCD predictions and fair agreement is found. As a consistency check we also present measurements of the azimuthal correlations between the lepton and hadron planes. A significant azimuthal dependence is found, consistent again with the QCD predictions.

Published
1990

12. Production of charmed mesons in γγ interactions

Author

Ehud Duchovni, J. Pawlak, A. Eskreys, D. H. Saxon, Gy. Wolf, E. Ros, A. Ladage, E. Lohrmann, M. Holder, B. Bock, T. Kracht, H. Hultschig, R. Wedemeyer, R. Gerhards, John Hart, K. U. Pösnecker, Sau Lan Wu, G. Poelz, E. Bernardi, J. Krüger, K. Genser, R. Walczak, H. Hartmann, D. Lüke, S. Ritz, Y. Eisenberg, Stephanie Brandt, W. Braunschweig, U. Karshon, Jens Hartmann, H. U. Martyn, Wolfram Dietrich Zeuner, A. Montag, F. J. Kirschfink, E. Hilger, D. Su, E.E. Ronat, M. Takashima, A. Jocksch, J. Del Peso, D. Notz, Fernando Barreiro, D. Muller, D. Revel, D. Strom, B. Löhl, D. Trines, A. Leites, D. Hochman, H. Kowalski, P. Joos, B. Foster, N. Wainer, J. Chwastowski, J. F. Hassard, H. M. Fischer, A. J. Martin, L. Lyons, Hermann Kolanoski, Georg Zobernig, Ian R Tomalin, and J. Shulman

Subjects
Physics, Particle physics, Antiparticle, Physics and Astronomy (miscellaneous), Meson, Hadron, Nuclear Theory, High Energy Physics::Phenomenology, Elementary particle, Nuclear physics, Particle decay, Pair production, Pion, High Energy Physics::Experiment, Nuclear Experiment, Engineering (miscellaneous), Lepton
Abstract

Production of charmed mesons in γγ-interactions at PETRA energies has been observed in the TASSO detector. Cross sections for inclusive D*± and {Mathematical expression} production have been measured. Neutral and charged meson pairs are estimated to be produced with comparable cross sections, and their sum seems to account for a sizeable fraction of σtot(γγ→hadrons) near the {Mathematical expression} threshold. © 1990 Springer-Verlag.

Published
1990

13. The production and decay of Tau leptons ine + e ? annihilation at PETRA energies

Author

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

Subjects
Nuclear physics, Physics, Particle decay, Pair production, Pion, Annihilation, Physics and Astronomy (miscellaneous), Branching fraction, Electron–positron annihilation, Engineering (miscellaneous), Charged particle, Lepton
Abstract

We have observed τ pair production at average CM energies of 13.9, 22.3, 34.5 and 43.1 GeV. The cross-sections are consistent with QED, the cut off parameters beingΛ +>161 GeV andΛ −169 GeV (95% CL). The topological branching fraction of the τ to 1 charged particle,B 1, is 0.847±0.011 (stat) −0.013 +0.016 (syst) and no decays to 5 charged particles were observed resulting inB 5

Published
1985

14. Photon pair production bye + e ? annihilation and search for supersymmetric photinos at energies greater than 40 GeV

Author

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

Subjects
Physics, Nuclear physics, Cross section (physics), Particle physics, Selectron tube, Photon, Missing energy, Annihilation, Pair production, Physics and Astronomy (miscellaneous), High Energy Physics::Experiment, Engineering (miscellaneous), Photino
Abstract

The cross section for the processe + e −→γγ has been measured for c.m. energies 39.5 61 GeV and Λ+> GeV (95% confidence level) have been determined. A search for two photon final states with missing energy provided lower limits on the masses of the photino and selectron.

Published
1984

15. Measurement of the radiative width of theA 2(1320) in two-photon interactions

Author

G. Baranko, H. M. Fischer, P. N. Ratoff, D. H. Saxon, Y. Eisenberg, D. Strom, R. Gerhards, J. Krüger, R. Walczak, Fernando Barreiro, W. Braunschweig, Stephanie Brandt, H. Hartmann, P. J. Dornan, W. G. Jones, D. Trines, G. P. Heath, Hl Krasemann, E.E. Ronat, Guenter Wolf, B. Bock, A. Jocksch, K. Gather, E. Ros, E. Hilger, E. Lohrmann, T. Kracht, Boaz Klima, G. Mikenberg, D. Revel, Wolfram Dietrich Zeuner, J. Eisenmann, H. Kück, W. Wallraff, C. Jenkins, Hermann Kolanoski, J. K. Sedgbeer, R. J. Cashmore, R. Wedemeyer, D. M. Binnie, W. A. T. Wan Abdullah, P. D. Dauncey, T. Tymieniecka, A. Montag, G. Yekutieli, M. Cherney, G. Zonering, H. U. Martyn, K. U. Pösnecker, J. Thomas, E. Bernardi, M. Althoff, D. Notz, D. A. Garbutt, P. Rosskamp, D. K. Hasell, R. Mir, D. Lüke, M. G. Bowler, S. Ritz, A. Shapira, B. Löhr, G. E. Forden, Joseph Izen, P. Joos, B. Foster, P. Mättig, D. Su, F. J. Kirschfink, V. Mertens, M. Holder, H. Kowalski, M. Takashima, H. Hultschig, E. Wicklund, D. J. Mellor, John Hart, Sau Lan Wu, A. Ladage, A. Eskreys, L. Labarga, B. Neumann, R.C.E. Devenish, U. Karshon, A. Caldwell, S. L. Lloyd, G. Poelz, and Philip Bull

Subjects
Physics, Particle acceleration, Cross section (physics), Physics and Astronomy (miscellaneous), Two-photon excitation microscopy, Radiative transfer, Elementary particle, Atomic physics, Engineering (miscellaneous), Resonance (particle physics)
Abstract

The reactione+e−→e+e− A2 (1320) has been observed by detecting the decayA2→π+,π-π0. The two-photon width of theA2 has been measured to be Г(A2→γγ)=(0.09±0.27 (stat)±0.16 (syst)) keV. The cross section σ(γγ→π+,π-π0 has been determined outside theA2 resonance region.

Published
1986

16. Inclusive? 0 production bye + e ? annihilation at 34.6 GeV center of mass energy

Author

H. Kowalski, A. Jocksch, J. Krueger, W. G. Jones, G. Tysarczyk, G. Baranko, R. Mir, B. Löhr, E. Hilger, Greg P Heath, P. Joos, B. Foster, Philip Burrows, J. M. Yelton, D. Notz, P. N. Ratoff, A. Shapira, E. Wicklund, D. J. Mellor, H. U. Martyn, R. Wedemeyer, D. K. Hasell, S. L. Lloyd, M. G. Bowler, D. Strom, G. Poelz, P. J. Dornan, K. Gather, E. Ros, A. Montag, Joseph Izen, M. Cherney, E. Bernardi, A. Ladage, Boaz Klima, G. Mikenberg, R.C.E. Devenish, D. Trines, Paul Dauncey, H. Kück, M. Takashima, K. U. Poesnecker, G. E. Forden, C. Jenkins, A. P. Watson, Fernando Barreiro, Guenter Wolf, H. M. Fischer, A. J. Martin, W. Wallraff, D. H. Saxon, D. Su, N. Wainer, A. Caldwell, Hermann Kolanoski, J. K. Sedgbeer, Wolfram Dietrich Zeuner, E.E. Ronat, Georg Zobernig, H. Hartmann, D. Revel, R. Gerhards, D. Lüke, D. M. Binnie, S. Ritz, J. Shulman, R. J. Cashmore, T. Tymieniecka, Ian R Tomalin, P. Mättig, C. Balkwill, D. A. Garbutt, A. Eskreys, E. Vogel, L. Labarga, B. Bock, T. Kracht, P. Rosskamp, V. Mertens, M. Holder, H. Hultschig, John Hart, Sau Lan Wu, F. J. Kirschfink, B. Neumann, U. Karshon, Stephanie Brandt, G. Yekutieli, Y. Eisenberg, R. Walczak, W. Braunschweig, E. Lohrmann, J. Eisenmann, and Hl Krasemann

Subjects
Nuclear physics, Physics, Range (particle radiation), Cross section (physics), Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Production (computer science), Center of mass, Multiplicity (chemistry), Engineering (miscellaneous), Energy (signal processing)
Abstract

The cross section for the process e+e-→π0+ anything has been measured at an average center of mass energy of 34.6 GeV for π0 energies between 0.7 and 17 GeV. The angular distribution for π0 energies larger than 2 GeV is of the form dσ/dΩ∼1+Acos2θ, with A=1.2±0.5. The ratio of π0 to π± production in the measured energy range is 2σ(π0)/(σ(π+)+σ(π-))=1.13±0.18 The form of the differential cross sections agrees within the errors. The mean π0 multiplicity is 5.8±0.9. © 1986 Springer-Verlag.

Published
1986

17. A measurement of theD s lifetime

Author

A. Montag, M. Takashima, M. Cherney, J. Del Peso, G. Yekutieli, P. D. Dauncey, T. Tymieniecka, D. Muller, F. J. Kirschfink, D. Strom, M. Holder, G. Baranko, H. Hultschig, John Hart, A. J. Sephton, Sau Lan Wu, R. Mir, E.E. Ronat, J. Shulman, C. Balkwill, A. Jocksch, R. Wedemeyer, K. U. Poesnecker, G. Poelz, J. M. Yelton, R. Gerhards, N. Wainer, D. Notz, A. Caldwell, K. Genser, Stephen Lloyd, V. Mertens, Fernando Barreiro, M. G. Bowler, A. Leites, A. Shapira, J. Krüger, J. Pawlak, D. Revel, E. Lohrmann, H. Hartmann, Y. Eisenberg, K. Gather, A. Eskreys, E. Ros, I. R. Tomalin, Wolfram Dietrich Zeuner, L. Labarga, Boaz Klima, W. Braunschweig, P. Mättig, J. Eisenmann, B. Löhr, A. Watson, E. Hilger, P. Joos, B. Foster, D. Trines, E. Wicklund, P. Rosskamp, D. J. Mellor, J. K. Sedgbeer, B. Bock, T. Kracht, A. Kolanoski, H. M. Fischer, A. J. Martin, G. P. Heath, Georg Zobernig, U. Karshon, B. Neumann, R. Walczak, D. K. Hasell, Joseph Izen, Gy. Wolf, D. H. Saxon, G. E. Forden, P. N. Ratoff, Rj Cashmore, Giora Mikenberg, A. Ladage, H. U. Martyn, E. Bernardi, Stephanie Brandt, D. Su, H. Kowalski, D. M. Binnie, Philip Burrows, D. Lüke, and S. Ritz

Subjects
Nuclear physics, Physics, Particle physics, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, Detector, Engineering (miscellaneous), Vertex (geometry)
Abstract

The lifetime of theD s meson has been measured using the TASSO detector at PETRA and found to be (5.7 −2.6 +3.6 ±0.9)×10−13 s. The method used was to reconstruct fully the decay vertex of the channelD s →ϕπ±, ϕ→K + K −.

Published
1987

18. Production and decay of charmed mesions ine + e ? annihilation at $$\sqrt s > 28$$

Author

U. Karshon, H. U. Martyn, D. Trines, Eduardo Ros, Jens Hartmann, Guenter Wolf, K. U. Pösnecker, K. Gather, D. Su, Hermann Kolanoski, E. Hilger, G. Mikenberg, K. Genser, M. G. Bowler, J. Shulman, H. M. Fischer, F. J. Kirschfink, D. Strom, H. Kowalski, A. J. Martin, M. Holder, A. Montag, H. Hultschig, B. Löhr, John Hart, Sau Lan Wu, J. Del Peso, Georg Zobernig, E. Bernardi, Janusz Chwastowski, P. Joos, A. Shapira, A. Ladage, J. M. Pawlak, Fernando Barreiro, B. Foster, R. S. Galik, E. Lohrmann, M. E. Veitch, Stephanie Brandt, G. Poelz, E.E. Ronat, T. Kracht, D. H. Saxon, R. Wedemeyer, Ian R Tomalin, P. Mättig, Philip Burrows, D. Revel, Wolfram Dietrich Zeuner, D. Muller, N. Wainer, A. Jocksch, D. Lüke, S. Ritz, G. E. Forden, A. Leites, R. Gerhards, A. Eskreys, A. Caldwell, John Hassard, J. Krüger, H. Hartmann, A. Watson, M. Takashima, D. Notz, G. Yekutieli, Y. Eisenberg, R. Walczak, and W. Braunschweig

Subjects
Physics, Quark, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, Charm quark, Nuclear physics, Pair production, High Energy Physics::Experiment, Production (computer science), Charm (quantum number), Engineering (miscellaneous)
Abstract

We report on a study of inclusive production ofD *± mesons ine + e − annihilation at c.m. energies between 28 and 46.8 GeV using the TASSO detector at the PETRA storage ring. A hardD *± energy spectrum is measured with a maximum nearE D *± ≃0.6E beam. The measured cross section ratio $$(\sigma _{D^{* + } } + \sigma _{D^{* - } } )/\sigma _{\mu \mu } = 1.28 \pm 0.09 \pm 0.18$$ indicates thatD * production accounts for a large fraction of the observed charm production. Two complementary methods have been used to determine the forward-backward asymmetry of charm pair production due to electroweak interference. Combining both measurements the product of the axial vector couplings of the electron and the charm quark to the weak neutral current was determined to beg A e g A c =−(0.276±0.073), in agreement with the standard model prediction of −0.25. Using a sample of reconstructedD *± mesons, the relative strength of the strong interaction coupling of thec quark compared to that of an average of all flavours is measured as αs(c)/αs(all)=0.91±0.38±0.15, consistent with the coupling constant being flavour independent. An update of ourD 0 lifetime measurement is presented, based on a considerable increase in statistics, the final result being $$\tau _{D^0 = } (4.8 \pm _{0.9 - 0.7}^{1.0 + 0.5} )10^{ - 13} s$$ .

Published
1989

19. A study of jets fromb quarks produced ine + e − annihilations at $$\sqrt s = 35 - 46$$ GeV

Author

Guenter Wolf, A. Jocksch, B. Bock, J. Krüger, D. Lüke, H. M. Fischer, S. Ritz, H. Hartmann, G. Yekutieli, U. Karshon, A. T. Belk, N. Wainer, T. Kracht, Jens Hartmann, W. Schütte, A. J. Martin, Fernando Barreiro, P. N. Ratoff, K. Gather, J. M. Yelton, K. U. Pösnecker, D. Notz, G. Mikenberg, S. L. Lloyd, A. Ladage, R. Gerhards, D. Su, A. Leites, D. H. Saxon, Georg Zobernig, H. Kowalski, G. Poelz, M. Takashima, A. Shapira, A. Eskreys, L. Labarga, E. Bernardi, Wolfram Dietrich Zeuner, Janusz Chwastowski, D. Revel, E. Hilger, K. Genser, J. M. Pawlak, M. G. Bowler, B. Löhr, E. Lohrmann, P. Joos, A. Montag, B. Foster, G. E. Forden, J. Del Peso, Y. Eisenberg, I. M. Silvester, R. Wedemeyer, R. Walczak, Philip Burrows, Eduardo Ros, R. J. Cashmore, G. P. Heath, W. Braunschweig, John Hassard, D. M. Binnie, Stephanie Brandt, H. U. Martyn, D. Strom, M. E. Veitch, A. J. Sephton, F. J. Kirschfink, E.E. Ronat, C. Balkwill, M. Holder, P. Mättig, H. Hultschig, John Hart, Sau Lan Wu, J. Shulman, I. R. Tomalin, D. Trines, Hermann Kolanoski, and D. Muller

Subjects
Quark, Physics, Particle physics, Physics and Astronomy (miscellaneous), Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Monte Carlo method, Strong interaction, Relative strength, Nuclear physics, High Energy Physics::Experiment, Rapidity, Multiplicity (chemistry), Nuclear Experiment, Engineering (miscellaneous)
Abstract

Ab enrichment technique using the longB lifetime has been developed, by which ∼600 hadronic events with >65%b purity are obtained. The properties of the associated jets are studied, with comparisons made between them and those in hadronic data in whichb quarks make up only 10% of the total, and jets in Monte Carlo events. The distributions in rapidity and multiplicity yield two new determinations of the fragmentation variablez forb hadrons and confirm that theb fragmentation function is hard. We also present the first measurement of the relative strength of the strong interaction coupling of theb quark compared with the average of all flavours.

Published
1989

20. A measurement of muon pair production ine + e ? annihilation at centre of mass energies 35.0? $$\sqrt s $$ ?46.8 GeV

Author

Janusz Chwastowski, Philip Burrows, M. E. Veitch, B. Bock, T. Kracht, I. R. Tomalin, P. Mättig, D. Strom, A. J. Sephton, H. M. Fischer, M. Takashima, Wolfram Dietrich Zeuner, Guenter Wolf, E. Hilger, D. Trines, K. Gather, J. M. Pawlak, A. J. Martin, E. Bernardi, G. Mikenberg, A. Leites, A. Ladage, A. Montag, K. U. Pösnecker, J. Krüger, J. Del Peso, P. N. Ratoff, K. Genser, D. Muller, Hermann Kolanoski, M. G. Bowler, H. Hartmann, D. Lüke, S. Ritz, A. N. Wainer, R. Wedemeyer, J. Shulman, Jens Hartmann, R. Gerhards, D. H. Saxon, B. Löhr, Georg Zobernig, Ehud Duchovni, A. Jocksch, Eduardo Ros, R. J. Cashmore, D. Notz, P. Joos, D. Su, B. Foster, M. Traseira, Fernando Barreiro, A. Eskreys, D. Revel, L. Labarga, G. E. Forden, I. M. Silvester, John Hassard, Y. Eisenberg, R. Walczak, W. Braunschweig, C. M. Hawkes, U. Karshon, Luis Hervas, F. J. Kirschfink, M. Holder, H. Hultschig, G. Yekutieli, John Hart, Sau Lan Wu, E. Lohrmann, E.E. Ronat, C. Balkwill, G. P. Heath, G. Poelz, Stephanie Brandt, H. Kowalski, and H. U. Martyn

Subjects
Physics, Particle physics, Muon, Annihilation, Physics and Astronomy (miscellaneous), media_common.quotation_subject, Electron–positron annihilation, Electroweak interaction, Weinberg angle, Asymmetry, Standard Model, Nuclear physics, Pair production, Engineering (miscellaneous), media_common
Abstract

The reactione+e−→µ+µ− has been studied at centre of mass energies between 35.0 and 46.8 GeV using the TASSO detector at PETRA. We present measurements of the forward-backward charge asymmetry (Aμμ) and cross section σμμ for this reaction at three energies. At 35.0 GeV we obtain a cross section relative to the QED prediction ofRμμ=σμμ/σo=0.932±0.018±0.044 andAμμ=(−10.6−2.3+2.2±0.5)%. At 38.3 GeV we findRμμ=0.951±0.072−0.057+0.063 andAμμ=(+1.7−8.6+8.5±0.5)%. At 43.6 GeV we measureRμμ=0.921±0.037±0.055 andAμμ=(−17.6−4.3+4.4±0.5)%. Our results are in good agreement with the predictions of the standard model. Including previous TASSO data we present improved determinations of muonic electroweak parameters. We also report on lower limits of possible contributions from contact interactions.

Published
1988

21. Study ofη production in two-photon collisions

Author

U. Karshon, Eduardo Ros, D. Notz, D. Strom, Janusz Chwastowski, G. Poelz, Ehud Duchovni, K. Gather, G. Mikenberg, Y. Eisenberg, R. Walczak, E. Veitch, A. Montag, A. J. Sephton, W. Braunschweig, I. M. Silvester, J. Del Peso, A. Eskreys, L. Labarga, J. M. Pawlak, D. Trines, Wolfram Dietrich Zeuner, Fernando Barreiro, M. Takashima, E. Hilger, Hermann Kolanoski, R. Gerhards, D. Hochman, J. Shulman, G. P. Heath, Philip Burrows, N. Wainer, R. Wedemeyer, D. Revel, J. Krüger, A. Caldwell, John Hassard, Jens Hartmann, H. Kowalski, K. Genser, D. H. Saxon, M. G. Bowler, H. Hartmann, G. E. Forden, Guenter Wolf, E. Lohrmann, P. Märtig, B. Löhr, D. Su, A. Ladage, P. Joos, B. Foster, E. Wicklund, H. M. Fischer, H. U. Martyn, B. Bock, A. J. Martin, D. Muller, T. Kracht, A. Leites, L. Lyons, A. Jocksch, Georg Zobernig, I. R. Tomalin, Stephanie Brandt, D. Lüke, P. N. Ratoff, S. Ritz, E. Bernardi, F. J. Kirschfink, E.E. Ronat, C. Balkwill, V. Mertens, M. Holder, H. Hultschig, John Hart, Sau Lan Wu, G. Yekutieli, K. U. Pösnecker, and A. Shapira

Subjects
Physics, Systematic error, Physics and Astronomy (miscellaneous), Two-photon excitation microscopy, Meson, Branching fraction, Elementary particle, Quantum field theory, Atomic physics, Engineering (miscellaneous), Standard deviation
Abstract

Production of theη c meson ine + e − quasireal two photon collisions has been looked for in three channels. The data were obtained from an integrated luminosity of 189 pb−1. Anη c signal is observed in two decay modes (K 0 K ±π∓,π+π-π+π-) with a combined statistical significance of 3.5 standard deviations. Using the knownη c branching ratios to these channels and toK + K -π+π- the combined partialη c width to γγ isΓ γγ(η c ). The first error is statistical, and the second one includes the systematic and branching ratio errors. Calculated as an upper limit we obtainΓ γγ(η c ) (95% C.L., including the systematic error).

Published
1989

22. Jet fragmentation and QCD models ine + e − annihilation at c.m. energies between 12.0 and 41.5 GeV

Author

R. Walczak, I. M. Silvester, W. Braunschweig, Fernando Barreiro, F. J. Kirschfink, D. Revel, A. Montag, J. Del Peso, M. Holder, G. Yekutieli, H. Hultschig, John Hart, Sau Lan Wu, Jens Hartmann, J. F. Hassard, M. Takashima, U. Karshon, H. Kowalski, K. U. Pösnecker, A. Eskreys, G. Poelz, H. M. Fischer, L. Labarga, E.E. Ronat, B. Löhr, A. J. Martin, Rj Cashmore, C. Balkwill, Georg Zobernig, D. Su, Giora Mikenberg, J. M. Pawlak, P. Joos, B. Foster, A. Shapira, Gy. Wolf, D. Notz, A. Jocksch, A. Ladage, R. Wedemeyer, I. R. Tomalin, D. Strom, A. J. Sephton, J. Krüger, Stephanie Brandt, R. Gerhards, G. P. Heath, H. Hartmann, N. Wainer, E. Lohrmann, H. U. Martyn, B. Bock, A. Leites, D. Muller, E. Bernardi, T. Kracht, K. Genser, M. G. Bowler, Wolfram Dietrich Zeuner, Eduardo Ros, E. Hilger, D. H. Saxon, P. N. Ratoff, Janusz Chwastowski, K. Gather, G. E. Forden, M. E. Veitch, P. Mättig, J. Shulman, D. Trines, Hermann Kolanoski, D. Lüke, S. Ritz, Philip Burrows, and Y. Eisenberg

Subjects
Quantum chromodynamics, Physics, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Hadron, Perturbative QCD, Observable, Nuclear physics, Fragmentation (mass spectrometry), High Energy Physics::Experiment, Nuclear Experiment, Engineering (miscellaneous)
Abstract

The large amount of data accumulated by the TASSO detector at 35 GeV c.m. energy has been compared with the predictions of the latest generation of perturbative QCD+fragmentation models. By adjustment of the arbitrary parameters of these models, a very good description of the global properties of hadronic events was obtained. No one model gave the best description of all features of the data, each model being better than the others for some observables and worse in other quantities. We interpret these results in terms of the underlying QCD and hadronisation schemes. The trends of the data across the energy range 12.0≦W≦41.5 GeV are generally well reproduced by the models with the parameters optimised at 35 GeV.

Published
1988

23. A detailed study of strange particle production ine + e − annihilation at high energy

Author

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

Subjects
Baryon, Nuclear physics, Physics, Strange quark, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Rapidity, Lambda, Engineering (miscellaneous), Scaling, Charged particle
Abstract

Results onK0 and Λ production ine+e− annihilation at c.m. energies of 14, 22 and 34 GeV are presented. The shape of theK0 and Λ differential cross sections are very similar to each other and to those of π±,K± and\(p(\bar p)\). Scaling violations are observed forK0 production. We obtain a value for the probability to produce strange quark-antiquark pairs relative to that to produce up or down quark-antiquark pairs of 0.35±0.02±0.05. The value ofRh=σ(e+e-→hX)/σµµ is shown to rise steadily with c.m. energy for all particle species. At 34 GeV we find 1.48±0.05K0 and 0.31±0.03 Λ per event. We have searched for possible Λ polarization. The production ofK0's and Λ's in jets is examined as a function ofpT2 and rapidity and compared to that of all charged particles; the yields in two and three jets are also investigated. Results are presented from events with two baryons\((\Lambda ,\bar \Lambda ,por\bar p)\) observed.

Published
1985

24. A measurement of theD 0 lifetime

Author

J. Krüger, H. Hartmann, H. U. Martyn, Giora Mikenberg, K. Gather, E. Ros, A. Montag, B. Bock, A. Caldwell, Stephen Lloyd, M. Cherney, Boaz Klima, T. Kracht, A. Ladage, J. Thomas, J. Messersmith, V. Mertens, E. Hilger, U. Karshon, C. Jenkins, Rj Cashmore, R. Mir, W. G. Jones, G. Yekutieli, F. J. Kirschfink, P. Dauncey, D. M. Binnie, J. M. Yelton, M. Althoff, M. Holder, David DeMille, A. Eskreys, D. Notz, L. Labarga, H. Hultschig, G. Baranko, John Hart, T. Tymieniecka, Sau Lan Wu, B. Neumann, A. Jocksch, Stephanie Brandt, D. Strom, G. E. Forden, W. Schütte, Fernando Barreiro, D. A. Garbutt, Y. Eisenberg, E.E. Ronat, R. Walczak, W. Braunschweig, Gy. Wolf, P. Rosskamp, P. J. Dornan, R. Wedemeyer, D. Su, M. Takashima, H. Kowalski, K. U. Pösnecker, W. A. T. Wan Abdullah, D. Revel, R. Gerhards, E. Bernardi, A. Shapira, M. G. Bowler, D. Lüke, S. Ritz, Wolfram Dietrich Zeuner, R.C.E. Devenish, B. Löhr, P. Joos, G. Poelz, B. Foster, D. H. Saxon, D. Trines, E. Wicklund, D. J. Mellor, Hermann Kolanoski, J. K. Sedgbeer, P. Mättig, P. N. Ratoff, W. Wallraff, Philip Bull, D. K. Hasell, Joseph Izen, H. M. Fischer, E. Lohrmann, J. Eisenmann, Georg Zobernig, G. P. Heath, and Hl Krasemann

Subjects
Particle acceleration, Physics, Nuclear physics, Particle physics, Mass energy, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, Mass spectrum, Elementary particle, Center of mass, Engineering (miscellaneous)
Abstract

We have determined the D0 lifetime from reconstructed vertices of D0 mesons produced in e+e- annihilations at an average center of mass energy of 42.2 GeV. From fifteen events the D0 lifetime was determined to be (4.3-1.4+2.0±0.8)×10-13s. © 1986 Springer-Verlag.

Published
1986

25. A search for particles with magnetic charge produced ine +e− annihilations at 543-1543-1543-1GeV

Author

G. Baranko, Rj Cashmore, P. Mättig, V. Mertens, A. Ladage, D. H. Saxon, R. Wedemeyer, Joseph Izen, P. N. Ratoff, F. J. Kirschfink, E. Ros, H. Kowalski, R. Gerhards, D. M. Binnie, J. Shulman, E. Lohrmann, R. Walczak, J. F. Hassard, Giora Mikenberg, J. Eisenmann, C. Balkwill, H. M. Fischer, A. J. Martin, N. Wainer, U. Karshon, A. Caldwell, S. Strom, Georg Zobernig, B. Bock, J. Chwastowski, Stephen Lloyd, M. Holder, G. P. Heath, H. Hultschig, T. Kracht, P. Rosskamp, G. Poelz, John Hart, Sau Lan Wu, A. Leites, D. Su, P. Joos, Hermann Kolanoski, B. Foster, A. Eskreys, J. K. Sedgbeer, L. Labarga, J. Pawlak, T. Tymieniecka, E. Wicklund, D. J. Mellor, Stephanie Brandt, J. Krüger, H. Hartmann, A. Watson, A. Jocksch, E. Bernardi, J. M. Yelton, E. Ronat, D. Notz, A. Montag, D. Trines, G. E. Forden, K. Gather, G. Yekutieli, Philip Burrows, M. Takashima, K. Genser, M. Cherney, M. G. Bowler, J. Del Peso, Gy. Wolf, Fernando Barreiro, H. U. Martyn, Y. Eisenberg, D. Revel, E. Hilger, P. D. Dauncey, W. Braunschweig, D. Lüke, S. Ritz, Wolfram Dietrich Zeuner, K. U. Pösnecker, D. Muller, A. J. Sephton, A. Shapira, B. Löhr, and I. R. Tomalin

Subjects
Nuclear physics, Physics, Physics and Astronomy (miscellaneous), Bar (music), Electron–positron annihilation, Magnetic monopole, Engineering (miscellaneous), Charged particle, Magnetic field
Abstract

By seeking to identify magnetically charged particles by their trajectories in a magnetic field, we set limits on the production of monopoles and dyons, via the processe+e−→γ*→M\(\bar M\), of masses up to 17 GeV and of magnetic charges between 10 e and 70 e

Published
1988

26. Search for two-photon production of resonances decaying intoK $$\bar K$$ andK $$\bar K$$ ?

Author

G. Yekutieli, V. Mertens, M. Holder, H. Hultschig, John Hart, A. Jocksch, K. U. Pösnecker, R. Rosskamp, S. L. Wu, D. H. Saxon, D. Su, H. U. Martyn, A. Caldwell, G. Mikenberg, G. Baranko, H. Venkataramania, R.C.E. Devenish, A. Montag, R. J. Cashmore, T. Kracht, M. Cherney, W. G. Jones, R. Mir, J. Thomas, U. Karshon, R. Wedemeyer, Guenter Wolf, E. Lohrmann, P. D. Dauncey, E. Hilger, T. Tymieniecka, K. W. Bell, D. Lüke, Ehud Duchovni, M. Hildebrandt, Fernando Barreiro, S. Ritz, W. A. T. Wan Abdullah, H. Kück, D. M. Binnie, M. G. Bowler, E. Bernardi, A. Shapira, E. Ronat, K. Gather, J. Eisenmann, H. Siebke, E. Ros, A. Eskreys, L. Labarga, Boaz Klima, A. Ladage, B. Neumann, H. Kowalski, C. Jenkins, Philip Bull, P. Mättig, D. A. Garbutt, Y. Eisenberg, S. L. Lloyd, A. T. Wood, D. Trines, R. Walczak, G. E. Forden, M. Mermikides, D. Revel, G. Poelz, D. Strom, W. Braunschweig, G. Kreutz, H. M. Fischer, Georg Zobernig, D. K. Hasell, W. Wallraff, Hermann Kolanoski, J. K. Sedgbeer, C. M. Hawkes, Joseph Izen, Stephanie Brandt, P. J. Dornan, G. P. Heath, Hl Krasemann, Michael Dittmar, Wolfram Dietrich Zeuner, B. Löhr, P. Joos, B. Foster, E. Wicklund, D. J. Mellor, M. Althoff, D. Notz, H. Hartmann, G. Knop, M. Takashima, and F. J. Kirschfink

Subjects
Physics, Nuclear physics, Photon, Physics and Astronomy (miscellaneous), Branching fraction, Product (mathematics), Resonance, Invariant mass, Production (computer science), Atomic physics, Engineering (miscellaneous), Bar (unit)
Abstract

An analysis of the production ofKS0KS0 andK±Ks0π∓ by two quasi-real photons is presented. The cross section forγγ→K0\(\overline {K^0 } \), which is given for the γγ invariant mass range fromK\(\bar K\) threshold to 2.5 GeV, is dominated by thef′(1525) resonance and an enhancement near theK\(\bar K\) threshold. Upper limits on the product of the two-photon width times the branching ratio intoK\(\bar K\) pairs are given forΘ(1700),h(2030), and ξ(2220). For exclusive two-photon production ofK±Ks0π∓ no significant signal was observed. Upper limits are given on the cross section ofγγ→K+\(\overline {K^0 } \)π− orK−K0π+ between 1.4 and 3.2 GeV and on the product of the γγ width times the branching ratio into theK\(\bar K\)π final states for theηc(2980) and the ι(1440), yieldingΓ(γγ)→i(1440))·BR(i(1440)→K\(\bar K\)π

Published
1985

27. 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

28. Measurement of the two-photon reaction γγ →π+π-π+π- at large values of Q2

Author

J. M. Pawlak, K. Gather, G. Mikenberg, U. Karshon, I. R. Tomalin, R. Wedemeyer, E.E. Ronat, A. Ladage, Guenter Wolf, H. M. Fischer, D. M. Binnie, C. Balkwill, Janusz Chwastowski, B. Löhr, A. J. Martin, P. Joos, D. Trines, B. Foster, Georg Zobernig, D. H. Saxon, E. Wicklund, F. J. Kirschfink, M. Holder, B. Bock, H. Hultschig, John Hart, Sau Lan Wu, T. Kracht, E. Lohrmann, A. Leites, I. M. Silvester, Hermann Kolanoski, P. N. Ratoff, G. P. Heath, M. E. Veitch, N. Wainer, A. Eskreys, P. Mättig, L. Labarga, J. Shulman, A. Caldwell, John Hassard, H. Kowalski, R. Gerhards, G. Poelz, H. U. Martyn, Jens Hartmann, D. Su, G. E. Forden, D. Notz, Stephanie Brandt, E. Bernardi, M. Takashima, J. Krüger, H. Hartmann, Y. Eisenberg, R. Walczak, W. Braunschweig, K. Genser, M. G. Bowler, A. Jocksch, G. Yekutieli, Wolfram Dietrich Zeuner, E. Hilger, K. U. Pösnecker, Fernando Barreiro, Eduardo Ros, A. Shapira, D. Muller, D. Strom, A. J. Sephton, D. Revel, D. Lüke, S. Ritz, A. Montag, J. Del Peso, and Philip Burrows

Subjects
Physics, Range (particle radiation), Photon, Physics and Astronomy (miscellaneous), Quantum mechanics, Phase space, Four-momentum, Form factor (quantum field theory), Virtual particle, Elementary particle, Atomic physics, Quantum field theory, Engineering (miscellaneous)
Abstract

The process γγ→π+π-π+π- has been investigated in reactions of the type e+e-→e+e-π+π-π+π- in the single tag mode. The range of the four momentum squared of one of the virtual photons was 0.28 GeV2/c2≦Q2≦3.6 GeV2/c2, the average being 〈Q2〉=0.92 GeV2/c2; the other photon was quasi real. The reaction is mainly described by the channels γγ→ρ0ρ0 and γγ→4π (phase space), occuring with about equal probability. The Q2-dependence of the cross section is in agreement with the ρ form factor. © 1988 Springer-Verlag.

Published
1988

29. VECTOR-MESON PRODUCTION IN THE FINAL-STATE K+K-PI+PI- OF PHOTON-PHOTON COLLISIONS

Author

H. Kück, V. Mertens, M. Holder, H. Hultschig, W. G. Jones, John Hart, Sau Lan Wu, A. Ladage, S. Ritz, B. Löhr, P. Joos, B. Foster, E. Wicklund, G. Yekutieli, D. J. Mellor, K. W. Bell, D. M. Binnie, D. Strom, K. Gather, E. Ros, P. Mättig, Stephanie Brandt, Boaz Klima, G. Mikenberg, R. J. Cashmore, E.E. Ronat, M. Takashima, P. D. Dauncey, T. Tymieniecka, R. Wedemeyer, R. Mir, D. Trines, P. J. Dornan, D. Su, C. Jenkins, H. Kowalski, D. A. Garbutt, Guenter Wolf, G. Baranko, W. A. T. Wan Abdullah, B. Bock, W. Wallraff, R.C.E. Devenish, Hermann Kolanoski, J. Krüger, J. K. Sedgbeer, H. Hartmann, Y. Eisenberg, E. Bernardi, T. Kracht, R. Walczak, W. Braunschweig, H. U. Martyn, A. Montag, M. Cherney, Wolfram Dietrich Zeuner, J. Thomas, M. Althoff, D. Notz, A. Jocksch, Fernando Barreiro, K. U. Pösnecker, D. Revel, A. Shapira, P. Rosskamp, E. Hilger, S. L. Lloyd, M. G. Bowler, G. Poelz, R. Gerhards, G. P. Heath, Hl Krasemann, J.F. Kirschfink, A. Caldwell, E. Lohrmann, J. Eisenmann, Ehud Duchovni, A. Eskreys, U. Karshon, L. Labarga, B. Neumann, G. E. Forden, P. N. Ratoff, D. K. Hasell, Joseph Izen, H. M. Fischer, Georg Zobernig, D. H. Saxon, Philip Bull, and D. Lüke

Subjects
Nuclear physics, Physics, Particle physics, Antiparticle, Particle decay, Pion, Effective mass (solid-state physics), Pair production, Physics and Astronomy (miscellaneous), Meson, Elementary particle, Vector meson, Engineering (miscellaneous)
Abstract

Vector meson production is studied in the reaction γγ→K+K-π+π-. A clear Φ(1020) signal is seen in the K+K- mass distribution and a K*0 (890) signal is visible in the K±π∓ one. Both do not seem to be strongly correlated with quasi two body final states. Cross sections for the processes γγ→K+K-π+π-, γγ→Φπ+π-, γγ→K+0K±π∓ and upper limits for the production of Φp, ΦΦ and K*0 {Mathematical expression} are given as function of the invariant γγ mass. © 1986 Springer-Verlag.

Published
1986

30. CHARGED MULTIPLICITY DISTRIBUTIONS AND CORRELATIONS IN E+E- ANNIHILATION AT PETRA ENERGIES

Author

B. Löhr, E. Hilger, D. Muller, Fernando Barreiro, P. Joos, B. Foster, K. U. Pösnecker, D. H. Saxon, D. Strom, A. Shapira, J. Shulman, A. Leites, D. Revel, A. Eskreys, A. Montag, Philip Burrows, J. Krüger, J. Del Peso, K. Gather, Stephanie Brandt, H. Hartmann, J. F. Hassard, R. Gerhards, H. U. Martyn, M. E. Veitch, Janusz Chwastowski, N. Wainer, G. E. Forden, A. Ladage, Wolfram Dietrich Zeuner, E. Bernardi, H. M. Fischer, A. J. Martin, K. Genser, F. J. Kirschfink, G. Poelz, M. G. Bowler, J. M. Pawlak, Georg Zobernig, U. Karshon, Eduardo Ros, T. Kracht, P. Mättig, H. Kowalski, D. Notz, D. Trines, Jens Hartmann, R. Wedemeyer, E.E. Ronat, Giora Mikenberg, D. Su, A. Caldwell, A. Jocksch, Hermann Kolanoski, Gy. Wolf, M. Takashima, M. Holder, D. Lüke, S. Ritz, H. Hultschig, John Hart, Sau Lan Wu, E. Lohrmann, Y. Eisenberg, R. Walczak, W. Braunschweig, and G. Yekutieli

Subjects
Physics, Quark, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Hadron, Lund string model, Multiplicity (mathematics), Elementary particle, Charged particle, Nuclear physics, High Energy Physics::Experiment, Engineering (miscellaneous)
Abstract

We report on an analysis of the multiplicity distributions of charged particles produced in e+e- annihilation into hadrons at c.m. energies between 14 and 46.8 GeV. The charged multiplicity distributions of the whole event and single hemisphere deviate significantly from the Poisson distribution but follow approximate KNO scaling. We have also studied the multiplicity distributions in various rapidity intervals and found that they can be well described by the negative binomial distribution only for small central intervals. We have also analysed forward-backward multiplicity correlations for different energies and selections of particle charge and shown that they can be understood in terms of the fragmentation properties of the different quark flavours and by the production and decay of resonances. These correlations are well reproduced by the Lund string model. © 1989 Springer-Verlag.

Published
1989

31. PARTICLE CORRELATION OBSERVED IN E+E- ANNIHILATIONS INTO HADRONS AT CM ENERGIES BETWEEN 29 AND 37 GEV

Author

H. Kowalski, U. Karshon, M. Takashima, Stephanie Brandt, H. U. Martyn, D. Su, B. Löhr, K. Gather, E. Ros, D. Strom, P. Joos, B. Foster, Boaz Klima, Luis Labarga, W. G. Jones, H. Venkataramania, H. Kück, E. Wicklund, B. Neumann, R. Rosskamp, G. E. Forden, D. J. Mellor, P. D. Dauncey, T. Tymieniecka, H. Hartmann, E. Hilger, U. Kötz, G. Baranka, D. Trines, R.C.E. Devenish, K. U. Pösnecker, H. Siebke, W. A. T. Wan Abdullah, P. J. Dornan, D. A. Garbutt, E. Bernardi, Y. Eisenberg, A. Shapira, M. Althoff, R. Wedemeyer, D. Notz, Fernando Barreiro, R. Fohrmann, W. Braunschweig, P. N. Ratoff, A. Jocksch, Hermann Kolanoski, T. Kracht, C. M. Hawkes, D. Lüke, J. K. Sedgbeer, C. Jenkins, Rj Cashmore, S. Ritz, G. Poelz, Michael Dittmar, Wolfram Dietrich Zeuner, G. Yekutieli, M. Hildebrandt, Gy. Wolf, D. H. Saxon, M. Mermikides, D. Revel, P. Mättig, W. Wallraff, Philip Bull, G. Kreutz, R. Mir, A. T. Wood, M. G. Bowler, G. Mikenberg, A. Montag, M. Cherney, F. J. Kirschfink, J. Thomas, E.E. Ronat, G. Knop, M. Holder, H. Hultschig, John Hart, A. Lagage, A. Caldwell, Stephen Lloyd, G. P. Heath, Hl Krasemann, D. K. Hasell, Ehud Duchovni, Joseph Izen, H. M. Fischer, E. Lohrmann, J. Eisenmann, A. Eskreys, Georg Zobernig, V. Mertens, K. W. Bell, S. L. Wu, and D. M. Binnie

Subjects
Quantum chromodynamics, Physics, Particle physics, Range (particle radiation), Physics and Astronomy (miscellaneous), Electron–positron annihilation, Hadron, Charge (physics), Charged particle, Nuclear physics, Particle, Rapidity, High Energy Physics::Experiment, Engineering (miscellaneous)
Abstract

We have studied the correlations between charged particles produced in e+e- annihilations into hadrons at c.m. energies between 29 and 37 GeV. We have analysed the correlations between the charged multiplicities of the jets and the two particle rapidity and charge correlations. No evidence for correlations between the multiplicities of the two jets is found. Two particle short range rapidity and charge correlations are observed, indicating that particles cluster in rapidity and that their charges compensate locally. An extensive study of these correlation effects by QCD Monte Carlo calculations was performed. Evidence for charge correlations due to Bose-Einstein statistics is also observed. © 1985 Springer-Verlag.

Published
1985

32. PRODUCTION AND MUONIC DECAY OF HEAVY QUARKS IN E+E- ANNIHILATION AT 34.5 GEV

Author

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

Subjects
Nuclear physics, Physics, Particle decay, Particle physics, Muon, Pair production, Annihilation, Physics and Astronomy (miscellaneous), Branching fraction, Electron–positron annihilation, Hadron, Engineering (miscellaneous), Lepton
Abstract

The production of prompt muons in e+e- annihilation has been studied at centre of mass energies near 34.5 GeV. The measured semi-muonic branching ratios of b and c quarks are B(b»Xμv) =0.117±0.028±0.01 and B(c→Xμv)=0.082 ±0.012a-0.01+0.02. The fragmentation functions of heavy quarks are hard, =0.85a-0.12-0.07+0.10+0.02 and =0.77a-0.07-0.11+0.05+0.03. Limits have been set on flavour changing neutral current decays:B(b→Xμ+μ-)

Published
1984

33. A STUDY OF BHABHA SCATTERING AT PETRA ENERGIES

Author

H. U. Martyn, P. N. Ratoff, G. E. Forden, D. M. Binnie, R. Gerhards, J. Krüger, G. Baranko, Wolfram Dietrich Zeuner, P. Joos, B. Foster, J. P. Cerezo, P. D. Dauncey, E. Wicklund, D. J. Mellor, Rj Cashmore, B. Bock, T. Kracht, N. Wainer, J. Del Peso, D. Muller, D. Strom, A. Watson, P. Mättig, J. Chwastowski, A. J. Sephton, K. U. Pösnecker, K. Gather, G. Yekutieli, C. Balkwill, V. Mertens, J. Hartmann, M.A. Garcia, A. Leites, J. M. Yelton, B. Löhr, D. H. Saxon, E. Lohrmann, E. Ronat, D. Notz, G. Poelz, D. Lüke, Joseph Izen, R. Wedemeyer, A. Ladage, S. Ritz, H. M. Fischer, A. J. Martin, A. Shapira, Fernando Barreiro, Hermann Kolanoski, H. Hartmann, A. Eskreys, R. Walczak, J. K. Sedgbeer, A. Montag, L. Labarga, E. Ros, I. R. Tomalin, M. Holder, Georg Zobernig, D. Trines, H. Hultschig, W. Braunschweig, A. Jocksch, E. Hilger, J. Pawlak, Stephanie Brandt, D. Su, T. Tymieniecka, M. Takashima, John Hart, H. Kowalski, G. P. Heath, P. Rosskamp, Y. Eisenberg, D. Revel, Philip Burrows, Sau Lan Wu, J. F. de Trocóniz, J. Shulman, Gy. Wolf, A. Caldwell, E. Bernardi, K. Genser, M. G. Bowler, Stephen Lloyd, Giora Mikenberg, F. J. Kirschfink, and U. Karshon

Subjects
Physics, Particle physics, Physics and Astronomy (miscellaneous), Electroweak interaction, Elementary particle, Weinberg angle, Physics::History of Physics, Standard Model, Nuclear physics, Particle acceleration, High Energy Physics::Experiment, Center of mass, Quantum field theory, Engineering (miscellaneous), Bhabha scattering
Abstract

We report on high statistics Bhabha scattering data taken with the TASSO experiment at PETRA at center of mass energies from 12 GeV to 46.8 GeV. We present an analysis in terms of electroweak parameters of the standard model, give limits on QED cut-off parameters and look for possible signs of compositeness. © 1988 Springer-Verlag.

Published
1988

34. Two-photon excitation of the tensor meson f0(1270)

Author

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

Subjects
Physics, Nuclear physics, Pair production, Physics and Astronomy (miscellaneous), Meson, Scattering, Invariant mass, Atomic physics, Engineering (miscellaneous), Excitation, Storage ring, Charged particle, Lepton
Abstract

We have measured charged particle pair production in two-photon scattering at the e+e- storage ring PETRA. While the main source of such events is the production of lepton pairs, the presence of an additional process is clearly indicated by the measured invariant mass distribution of the two particles and their angular distributions. We determine that the excess is mainly due to the decay f0(1270)→π+π-. We derive a width Γ(f0→γγ)=3.2±0.2±0.6 keV (statistical and systematic). © 1981 Springer-Verlag.

Published
1981

35. PION, KAON AND PROTON CROSS-SECTIONS IN E+E- ANNIHILATION AT 34 GEV AND 44 GEV CM ENERGY

Author

Guenter Wolf, I. M. Silvester, E.E. Ronat, C. Balkwill, D. M. Binnie, E. Lohrmann, H. Kowalski, M. Takashima, K. U. Pösnecker, A. Montag, J. Del Peso, P. Rehders, G. P. Heath, Hl Krasemann, M. Holder, H. Hultschig, J. Krüger, A. Shapira, John Hart, G. Tysarczyk, H. Hartmann, Sau Lan Wu, E. Bernardi, Stephanie Brandt, A. Jocksch, J. M. Pawlak, D. H. Saxon, W. Gerhardt, A. Eskreys, B. Bock, G. Poelz, L. Labarga, H. M. Fischer, H. U. Martyn, U. Karshon, A. J. Martin, Philip Burrows, T. Kracht, A. Leites, Fernando Barreiro, R. Wedemeyer, C. Winand, Jens Hartmann, Georg Zobernig, D. Notz, G. E. Forden, F. J. Kirschfink, D. Revel, A. Caldwell, John Hassard, D. Su, P. N. Ratoff, R. Gerhards, K. Genser, M. G. Bowler, N. Wainer, Y. Eisenberg, R. Walczak, W. Braunschweig, B. Löhr, P. Joos, B. Foster, E. Wicklund, A. Ladage, D. Lüke, S. Ritz, G. Yekutieli, Wolfram Dietrich Zeuner, Eduardo Ros, R. J. Cashmore, E. Hilger, Janusz Chwastowski, K. Gather, G. Mikenberg, M. E. Veitch, P. Mättig, J. Shulman, I. R. Tomalin, D. Muller, D. Strom, A. J. Sephton, D. Trines, and Hermann Kolanoski

Subjects
Physics, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Proton, Meson, Astrophysics::High Energy Astrophysical Phenomena, Electron–positron annihilation, Elementary particle, Nuclear physics, Pion, Antiproton, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, Engineering (miscellaneous)
Abstract

The inclusive production of π± andK± mesons and of protons and antiprotons ine+e− annihilations has been measured at 34 GeV and 44 GeV center of mass energy; in addition π± mesons have been measured at 44 GeV c.m. energy. Differential cross sections and particle yields are given. At 34 GeV average multiplicities are: $$\begin{gathered} \left\langle {n\left( {\pi ^ \pm } \right)} \right\rangle = 10.9 \pm 0.5,\left\langle {n\left( {K^ \pm } \right)} \right\rangle = 1.76 \pm 0.20, \hfill \\ \left\langle {n\left( {p + \bar p} \right)} \right\rangle = 0.67 \pm 0.06 \hfill \\ \end{gathered} $$ and at 44 GeV: $$\left\langle {n\left( {\pi ^ \pm } \right)} \right\rangle = 11.1 \pm 0.5,\left\langle {n\left( {\pi ^0 } \right)} \right\rangle = 5.4 \pm 1.0.$$

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