Author: "D. Trines" - Searchworks@Jio Institute Digital Library Search Results

Your search keyword '"D. Trines"' showing total 95 results

Start Over Author "D. Trines"

95 results on '"D. Trines"'

1. Superconducting TESLA cavities

Author: B. Aune, R. Bandelmann, D. Bloess, B. Bonin, A. Bosotti, M. Champion, C. Crawford, G. Deppe, B. Dwersteg, D. A. Edwards, H. T. Edwards, M. Ferrario, M. Fouaidy, P.-D. Gall, A. Gamp, A. Gössel, J. Graber, D. Hubert, M. Hüning, M. Juillard, T. Junquera, H. Kaiser, G. Kreps, M. Kuchnir, R. Lange, M. Leenen, M. Liepe, L. Lilje, A. Matheisen, W.-D. Möller, A. Mosnier, H. Padamsee, C. Pagani, M. Pekeler, H.-B. Peters, O. Peters, D. Proch, K. Rehlich, D. Reschke, H. Safa, T. Schilcher, P. Schmüser, J. Sekutowicz, S. Simrock, W. Singer, M. Tigner, D. Trines, K. Twarowski, G. Weichert, J. Weisend, J. Wojtkiewicz, S. Wolff, and K. Zapfe
Subjects: Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: The conceptional design of the proposed linear electron-positron collider TESLA is based on 9-cell 1.3 GHz superconducting niobium cavities with an accelerating gradient of E_{acc}≥25 MV/m at a quality factor Q_{0}≥5×10^{9}. The design goal for the cavities of the TESLA Test Facility (TTF) linac was set to the more moderate value of E_{acc}≥15 MV/m. In a first series of 27 industrially produced TTF cavities the average gradient at Q_{0}=5×10^{9} was measured to be 20.1±6.2 MV/m, excluding a few cavities suffering from serious fabrication or material defects. In the second production of 24 TTF cavities, additional quality control measures were introduced, in particular, an eddy-current scan to eliminate niobium sheets with foreign material inclusions and stringent prescriptions for carrying out the electron-beam welds. The average gradient of these cavities at Q_{0}=5×10^{9} amounts to 25.0±3.2 MV/m with the exception of one cavity suffering from a weld defect. Hence only a moderate improvement in production and preparation techniques will be needed to meet the ambitious TESLA goal with an adequate safety margin. In this paper we present a detailed description of the design, fabrication, and preparation of the TESLA Test Facility cavities and their associated components and report on cavity performance in test cryostats and with electron beam in the TTF linac. The ongoing research and development towards higher gradients is briefly addressed.
Published: 2000
Full Text: View/download PDF

2. DSTAR+/- PRODUCTION BY E+E- ANNIHILATION NEAR 34.4 GEV CM ENERGY

Author: P. Leu, D. Lüke, D.W. Schmitz, P. J. Dornan, A. J. Campbell, R. Fohrmann, H. Hartmann, D. Strom, B. Löhr, R. J. Cashmore, U. Kötz, Gl Salmon, T. Barklow, J. Harvey, R.C.E. Devenish, H. Siebke, P. Joos, K. Lübelsmeyer, D. A. Garbutt, E. Hilger, M. Dittmar, G. Rudolph, D. Hochman, T. R. Wyatt, J. Proudfoot, A. Ladage, F. J. Kirschfink, Ehud Duchovni, G. Yekutieli, H. Kück, E. Wicklund, J. McCardle, R. Riethmüller, P. E. L. Clarke, D. Heyland, T. D. Jones, K. W. Bell, P. Mättig, A. Shapira, D. Trines, K. Gather, Y. Eisenberg, Lan Wu Sau Lan Wu, D. H. Saxon, Juergen Thomas, W. Braunschweig, W. Wallraff, Hermann Kolanoski, C. Youngman, D. Pandoulas, G. Mikenberg, M. Wollstadt, W. Koch, Joseph Izen, J. K. Sedgbeer, A. M. Rushton, R. Beuselinck, Hl Krasemann, D. R. Quarrie, H. M. Fischer, W. G. Jones, Walter Dr. Hillen, R. Wedemeyer, G. Poelz, R. Mir, G. Peise, H. Venkataramania, I. C. Brock, M. Althoff, D. Notz, Georg Zobernig, J. Pyrlik, Stephen Lloyd, P. L. Woodworth, K. H. Mess, E. Lohrmann, J. Rimkus, U. Karshon, P. Grossmann, M. G. Bowler, Gy. Wolf, B. Foster, D. M. Binnie, H. U. Martyn, W. Schütte, Norbert Wermes, M. Holder, I. Al-Agil, H. Hultschig, D. Revel, H. Burkhardt, B. H. Wiik, L. Köpke, M. Cherney, John Hart, H. G. Sander, E.E. Ronat, G. Knop, and H. Kowalski
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Pion, Meson, Neutral current, Branching fraction, Electron–positron annihilation, Hadron, Charm quark
Abstract: D∗± production via e+e−→D∗±X has been measured at an average CM energy of 34.4 GeV. The D∗± energy spectrum is hard, with a maximum near χ = 0.6. The size of the D∗ cross section, R D ∗ = σ( e + e − → D ∗ X ) σ μμ = 2.50 ± 0.64 ± 0.88 (assuming R D ∗0 = R D ∗+ ) indicates that a large fraction of charm quark production yields D∗ mesons. The D∗± angular distribution exhibits a forward—backward asymmetry, A = −0.28 ± 0.13. This is consistent with that expected in the standard theory for weak neutral currents and leads to |gAc| = 0.89 ± 0.44 for the axial vector coupling of the charm quark.
Published: 2016

3. 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

4. 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

5. SEARCH FOR NEW SEQUENTIAL LEPTONS IN E+E- ANNIHILATION AT PETRA ENERGIES

Author: John Freeman, M. Ogg, Walter Dr. Hillen, D. M. Binnie, G. Peise, H. Hartmann, F. J. Kirschfink, W. Wallraff, H. M. Fischer, W. Koch, J. Proudfoot, H. Hultschig, B. H. Wiik, T. Barklow, S. Yarker, P. J. Dornan, G. Poelz, G. Rudolph, D. G. Cassel, E. Hilger, E.E. Ronat, R. Rüsch, Rj Cashmore, J. Pyrlik, H. Boerner, G. Knop, D. Heyland, R. A. Stern, Ehud Duchovni, D. H. Saxon, P. Joos, R.C.E. Devenish, R. Brandelik, E. Wicklund, M. A. Downie, D.W. Schmitz, J. C. Hart, P. Mättig, John Illingworth, R. Wedemeyer, AS von Dratzig, P. L. Woodworth, O. Römer, Gl Salmon, T. Meyer, Kadansky, J. Rimkus, H. Kowalski, R. Riethmüller, D. Trines, A. Ladage, Stephen Lloyd, H. G. Sander, K. Lübelsmeyer, P. Söding, Gy. Wolf, P. Koehler, R. Fohrmann, L. Koepke, Hermann Kolanoski, U. Karshon, Y. Eisenberg, P. Grossmann, U. Kötz, H. Burkhardt, D. Notz, S Lan Wu, I. C. Brock, G Zobernig, C. Youngman, A. Shapira, D. A. Garbutt, W. G. Jones, Kw Bell, P. Schmüser, M. Holder, K. Gather, I. Al-Agil, D. Revel, P. Leu, D. Lüke, G. Mikenberg, W. Braunschweig, P. Lecomte, B. Foster, J. Sedgbeer, H. L. Lynch, T. R. Wyatt, D. Pandoulas, Hu Martyn, Quarrie, M. Wollstadt, and N Wermes
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Lepton
Published: 2016

6. 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

7. 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

8. 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

9. 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

10. 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

11. 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

12. 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

13. 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

14. ELECTROWEAK COUPLING-CONSTANTS IN THE LEPTONIC REACTIONS E+E--]E+E- AND E+E--]MU+MU- AND SEARCH FOR SCALAR LEPTONS

Author: O. Römer, T. Barklow, H. Kowalski, W. Koch, W. G. Jones, K. Gather, C. Youngman, I. C. Brock, G. Poelz, G. Mikenberg, K. H. Mess, E. Lohrmann, D. M. Binnie, I. Al-Agil, Hu Martyn, Quarrie, U. Karshon, B. Foster, M. Holder, H. Hultschig, Y. Eisenberg, Gy. Wolf, M. G. Bowler, Gl Salmon, J. Sedgbeer, B. H. Wiik, R.C.E. Devenish, T. Meyer, W. Braunschweig, H. Hartmann, R. Wedemeyer, P. J. Dornan, P. Grossmann, H. Boerner, D. Lüke, Ehud Duchovni, A. Ladage, J. Franzke, Norbert Wermes, S. L. Wu, A. Shapira, J. Proudfoot, John Illingworth, U. Kötz, D. Heyland, D.W. Schmitz, T. R. Wyatt, P. L. Woodworth, Juergen Thomas, D. A. Garbutt, H. Burkhardt, A. J. Campbell, E.E. Ronat, W. Schütte, E. Hilger, D. Notz, R. Fohrmann, K. Lübelsmeyer, P. Söding, G. Knop, S. Cooper, M. Wollstadt, R. Carnegie, P. E. L. Clarke, P. Leu, R. Brandelik, D. Pandoulas, D. Revel, J. Rimkus, F. J. Kirschfink, L. Köpke, H. G. Sander, H. L. Lynch, Walter Dr. Hillen, G. Peise, Hl Krasemann, G. Rudolph, B. Löhr, R. Riethmüller, J. Pyrlik, Kw Bell, P. Schmüser, T. D. Jones, J. Harvey, Rj Cashmore, H. M. Fischer, D. H. Saxon, Georg Zobernig, R. Beuselinck, J. C. Hart, Sl Lloyd, P. Mättig, M. Ogg, P. Joos, E. Wicklund, D. Trines, W. Wallraff, and Hermann Kolanoski
Subjects: Physics, Coupling constant, Nuclear and High Energy Physics, Particle physics, Muon, Scalar (mathematics), Electroweak interaction, Weinberg angle, Astrophysics::Cosmology and Extragalactic Astrophysics, Nuclear physics, Pair production, High Energy Physics::Experiment, Lepton, Bhabha scattering
Abstract: A high statistics experiment was performed on Bhabha scattering at energies between 14 and 34 GeV. Good agreement with QED was observed. The combined data on Bhabha scattering and μ pair production were found to agree with the standard theory of electroweak interaction giving sin2 θ = 0.27-0.07+0.06. Assuming for the Z0 mass a value of 90 GeV the leptonic weak coupling constants were determined to gV2 = -0.04 ± 0.06 and gA2 = 0.35 ± 0.09. A search for scalar leptons sets lower limits on the mass of scalar electrons ofMse > 16.6 GeV and of scalar muons of Msμ > 16.4 GeV. © 1982.
Published: 2016

15. Improved surface treatment of the superconducting TESLA cavities

Author: B. Visentin, Roberto Losito, Peter Schmüser, C. Antoine, D. Trines, L. Ferreira, D. Bloess, J.-P. Charrier, H. Safa, Enrico Chiaveri, L. Lilje, Cristoforo Benvenuti, H. Preis, A. Matheisen, D. Reschke, H. Wenninger, and D. Proch
Subjects: Accelerator Physics (physics.acc-ph), Nuclear and High Energy Physics, Field (physics), Physics::Instrumentation and Detectors, Niobium, FOS: Physical sciences, Polishing, chemistry.chemical_element, chemistry [niobium], law.invention, Nuclear physics, Engineering, proposed [linear collider], law, ddc:530, fabrication [RF system], Collider, Instrumentation, Physics, Superconductivity, business.industry, surface [RF system], Isotropic etching, Particle acceleration, Upgrade, chemistry, impedance [RF system], Physics::Accelerator Physics, Optoelectronics, Physics - Accelerator Physics, High Energy Physics::Experiment, superconductivity [RF system], business, energy loss [RF system], linear collider [electron positron]
Abstract: TESLA Reports 11 pp. (2004)., The proposed linear electron-positron collider TESLA is based on 1.3 GHz superconducting niobium cavities for particle acceleration. For a center-of-mass energy of 500 GeV an accelerating field of 23.4 MV/m is required which is reliably achieved with a niobium surface preparation by chemical etching. An upgrade of the collider to 800 GeV requires an improved cavity preparation technique. In this paper results are presented on single-cell cavities which demonstrate that fields of up to 40 MV/m are accessible by electrolytic polishing of the inner surface of the cavity.
Published: 2004

16. A 2 Kelvin helium II distributed cooling system for the 2 × 250 GeV e+e− linear collider TESLA

Author: G. Horlitz, T.J. Peterson, and D. Trines
Subjects: Physics, General Physics and Astronomy, chemistry.chemical_element, Refrigeration, Electron, law.invention, Nuclear physics, Positron, chemistry, law, Water cooling, General Materials Science, Center of mass, Collider, Helium
Abstract: An international collaboration is studying technical and economical aspects of asuperconducting 2 × 250 GeV electron/positron linear collider with a center of mass energy of 500 GeV. The required refrigeration system with total power of 77.0 kW at 2 K, 67.0 kW at 4.5 K and 352.0 kW at 40/80 K is described in this paper.
Published: 1994

17. [Untitled]

Author: D. Trines
Subjects: Physics, medicine.medical_specialty, Nuclear Energy and Engineering, Technological design, medicine, Systems engineering, DESY, Medical physics, Design characteristics, Linear particle accelerator
Abstract: The current status of the TESLA colliding-beam linear accelerator project is reviewed. The design is being developed by specialists from 44 institutes and 10 countries. The technological design phase has now been completed. The design characteristics of the basic systems of the accelerator have been demonstrated successfully on the TTF test accelerator at DESY. A decision concerning the financing of the project is expected in the near future.
Published: 2002

18. 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

19. 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

20. First operation of a free- electron laser generating GW power radiation at 32 nm wavelength

Author: F. Stulle, A.A. Fateev, O. I. Brovko, Martin Dohlus, R. Kammering, Bagrat Petrosyan, E. Jaeschke, Valeri Ayvazyan, H. Weise, D. Proch, M.C. Ross, B. Beutner, S. Choroba, H. J. Schreiber, C. Magne, W.-D. Möller, Boris Schmidt, B. Steffen, Olivier Napoly, L. Catani, Luca Poletto, Ashot Vardanyan, U. Gensch, M. Kollewe, M. Schmitz, D. Richter, Rainer Wanzenberg, K. Zapfe, J. Pflüger, Mikhail Krassilnikov, Josef Feldhaus, J. Menzel, G. Kube, Ingo Will, Klaus Flöttmann, Andrew Brandt, Anne Oppelt, G. Di Pirro, Paolo Michelato, Sabine Riemann, D. Pugachov, Josef Frisch, Vitali Kocharyan, Bart Faatz, L. Fröhlich, K. Wittenburg, M. Nagl, K. Honkavaara, Mikhail Yurkov, A. Winter, N. Baboi, M. Minty, Brian Petersen, N. Golubeva, D. Krämer, M.v. Hartrott, J. Schneider, H. T. Edwards, M. Hüning, T. Garvey, Dirk Nölle, Elke Plönjes, Alessandro Cianchi, Thomas Weiland, M. Jablonka, M. Körfer, Velizar Miltchev, Jörg Rossbach, L. Staykov, K. P. Sytchev, H. Thom, Piergiorgio Nicolosi, Siegfried Schreiber, Carlo Pagani, E.L. Saldin, Dirk Lipka, O. Grimm, L. Lilje, Evgeny Schneidmiller, Enrica Chiadroni, Frank Stephan, I. Tsakov, Stefan Setzer, P. Zambolin, J.H. Han, Holger Schlarb, M. Sachwitz, K. Rehlich, Kai Tiedtke, R. Paparella, Jean-Paul Carneiro, H.-J. Grabosch, D. Kostin, H. Delsim-Hashemi, Florian Löhl, Sergiy Khodyachykh, E. Sombrowski, Daniele Sertore, I. Bohnet, Peter Schmüser, T. Nunez, M. Castellano, U. Hahn, M. Luong, Wolfgang Franz Otto Müller, D. Trines, J. Bähr, S. Casalbuoni, A. Shabunov, Rolf Treusch, Igor Zagorodnov, V. Balandin, Y. Kim, Rasmus Ischebeck, Bagrat Grigoryan, P. Castro, Wolfgang Sandner, V. Katalev, M. Tischer, A. Bolzmann, T. Limberg, M. Wendt, Laura Monaco, S. Düsterer, R. Brinkmann, S. Simrock, B. Keitel, Philippe Piot, Laboratoire de l'Accélérateur Linéaire (LAL), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], Synchrotron radiation, 41.60.Cr, 29.17.+w, 29.27.-a, 41.75.Lx, 7. Clean energy, 01 natural sciences, 010305 fluids & plasmas, law.invention, AMPLIFIED SPONTANEOUS EMISSION, TESLA-TEST-FACILITY, FEL, VUV, Optics, law, 0103 physical sciences, ddc:530, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, Physics, business.industry, Settore FIS/01 - Fisica Sperimentale, Synchrotron Radiation Source, Free-electron laser, Particle accelerator, Laser, Atomic and Molecular Physics, and Optics, Wavelength, Femtosecond, business, Ultrashort pulse, Free electron laser
Abstract: Published online 16 November 2005 Groupe SERA; Many scientific disciplines ranging from physics, chemistry and biology to material sciences, geophysics and medical diagnostics need a powerful X-ray source with pulse lengths in the femtosecond range [1-4]. This would allow, for example, time-resolved observation of chemical reactions with atomic resolution. Such radiation of extreme intensity, and tunable over a wide range of wavelengths, can be accomplished using high-gain free-electron lasers (FEL) [5-10]. Here we present results of the first successful operation of an FEL at a wavelength of 32 nm, with ultra-short pulses (25 fs FWHM), a peak power at the Gigawatt level, and a high degree of transverse and longitudinal coherence. The experimental data are in full agreement with theory. This is the shortest wavelength achieved with an FEL to date and an important milestone towards a user facility designed for wavelengths down to 6 nm. With a peak brilliance exceeding the state-of-the-art of synchrotron radiation sources [4] by seven orders of magnitude, this device opens a new field of experiments, and it paves the way towards sources with even shorter wavelengths, such as the Linac Coherent Light Source [3] at Stanford, USA, and the European X-ray Free Electron Laser Facility [4] in Hamburg, Germany.
Published: 2006

21. The Photon Collider at Tesla

Author: Alexander Wagner, K. Hagiwara, Jose I. Illana, J. Chyla, M. Ferrario, A. M. Stasto, H. J. Schreiber, W. Da Silva, S. Wipf, Aleksander Filip Zarnecki, A. De Roeck, G. L. Kotkin, S. Schreiber, Rohini M. Godbole, P. Raimondi, Tadashi Kon, S. Mtingwa, Paweł Jankowski, M. Leenen, Theresa S. Mayer, Valery G. Serbo, M. V. Galynskii, Andrei Seryi, Ömer Yavaş, D. Trines, Saleh Sultansoy, Alexander Finch, Abbas Kenan Ciftci, W. Decking, Y. P. Kuang, P.M. Zerwas, H. Schönnagel, Alexander A. Penin, C. Carimalo, E. Saldin, A. Tkabladze, C. A. Heusch, D. S. Gorbunov, P. J. Bussey, H. Fraas, G. Pancheri, B. Badelek, A. P. Potylitsyn, T. Quast, Leif J. Jönsson, Michael Spira, Peter V. Nickles, E. E. Boos, S. Söldner-Rembold, Michael Kramer, Maria Krawczyk, David J. Miller, Robert Klanner, C. Blochinger, H. Redlin, V. A. Ilyin, K. Yokoya, Ingo Will, G. Gounaris, Harald Burkhardt, R. Brinkmann, K. P. Schuler, R. Orava, M. Muhlleitner, F. Zomer, Thomas G. Rizzo, K. Kobayashi, Victor S. Fadin, Fabian Franke, L. Han, N. Walker, Tohru Takahashi, R. Shanidze, M. Yurkov, Saurabh D. Rindani, G. Jikia, W. Sandner, A. Undrus, E. Schneidmiller, Valery I. Telnov, B. Muryn, I. Ginzburg, F. Kapusta, M. Kalachnikow, Johannes Blümlein, M. Klasen, Yi Jiang, A. Gamp, R. D. Heuer, W. F. Ma, I. Watanabe, F. Richard, M. Levchuk, M. Melles, Poulose Poulose, E. A. Kuraev, J. Kwiecinski, Thorsten Wengler, and H. U. Martyn
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Photon, Physics::Instrumentation and Detectors, Physics::Optics, Astronomy and Astrophysics, Atomic and Molecular Physics, and Optics, Technical design, law.invention, law, Physics::Accelerator Physics, High Energy Physics::Experiment, Centre for Theoretical Studies (Ceased to exist at the end of 2003), Collider
Abstract: High energy photon colliders (γγ,γe) are based on e-e-linear colliders where high energy photons are produced using Compton scattering of laser light on high energy electrons just before the interaction point. This paper is a part of the Technical Design Report of the linear collider TESLA.1Physics program, possible parameters and some technical aspects of the photon collider at TESLA are discussed.
Published: 2004

22. Installation of the superconducting magnets in the HERA tunnel

Author: D. Trines, S. Chermenin, Z. Sanok, M. Leenen, J. Holz, K. Pieczora, H.J. Fiebig, S. Schollmeier, H. Grabe, K. Escherich, D. Degele, B. Petersen, H. Maywald, S. Wolff, P. Schmüser, O. Peters, G. Todten, I. Borchardt, R. Kus, D. Hubert, U. Riemer, W. Schwarz, and D. Brauer
Subjects: Physics, Superconductivity, Cryostat, Nuclear physics, Dipole, Magnet, Physics::Accelerator Physics, Cell structure, Physics::Atomic Physics, Superconducting magnet, HERA, Storage ring
Abstract: The arcs of the proton storage ring of HERA are equipped with superconducting magnets. The magnets are arranged in a regular FODO cell structure consisting of two quadrupoles and four dipoles. The cryostats of the dipoles and the quadrupoles have a length of 9.7 m and 4 m, respectively. There are 422 dipoles and 224 quadrupoles in the ring, including some special magnets. In addition, there are about 1500 superconducting correction elements. The sequence of installation is discussed. The manpower requirements and the installation speed are described. Project engineering and project management aspects are considered. >
Published: 2002

23. A new powerful source for coherent VUV radiation: Demonstration of exponential growth and saturation at the TTF free-electron laser

Author: U. Hahn, Evgeny Schneidmiller, Thorsten Kamps, V. Gretchko, H.T. Edwards, T. Garvey, T. Limberg, A. Gamp, K. Rehlich, J. Schneider, Thomas Weiland, Peter Schmüser, J. Pflüger, M. Körfer, M. Minty, Mikhail Yurkov, K. P. Sytchev, E.L. Saldin, Valeri Ayvazyan, S. Choroba, Klaus Flöttmann, Gerhard Schmidt, Josef Feldhaus, Rasmus Ischebeck, L. Catani, C. Hessler, Bagrat Grigoryan, P. Castro, U. Müller, M. Tonutti, B. Steeg, Kai Tiedtke, K. Zapfe, Harald Genz, R. Sobierajski, Ch. Gerth, B. Sonntag, A. Liero, Frank Stephan, Matthias Liepe, Katja Honkavaara, K. Wittenburg, M. Jablonka, N. Baboi, Ingo Will, Paolo Michelato, D. Türke, Rainer Wanzenberg, M. Hüning, V. Verzilov, Siegfried Schreiber, A.A. Fateev, Thomas Wilhein, Rolf Treusch, Martin Dohlus, Jörg Rossbach, Bart Faatz, Alexandre Novokhatski, Alessandro Cianchi, Wolfgang Sandner, Stefan Setzer, M. Wendt, Holger Schlarb, Jacek Krzywinski, M. Castellano, D. Trines, F. Peters, J. Menzel, H. Loos, H. Weise, H. J. Schreiber, R. Brinkmann, Achim Richter, I. Reyzl, S. Simrock, D. Nölle, Philippe Piot, I. Bohnet, Lukasz Plucinski, Daniele Sertore, C. Magne, Carlo Pagani, S. Wolff, Mikhail Krassilnikov, M. Luong, Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Kerec, Hélène
Subjects: Physics, Amplified spontaneous emission, 010308 nuclear & particles physics, business.industry, Free-electron laser, Optical physics, Shot noise, Radiation, Laser, 7. Clean energy, 01 natural sciences, Atomic and Molecular Physics, and Optics, law.invention, Wavelength, Optics, law, [PHYS.PHYS.PHYS-INS-DET] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 0103 physical sciences, ddc:530, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Atomic physics, 010306 general physics, business, Coherence (physics)
Abstract: We present experimental evidence that the free-electron laser at the TESLA Test Facility has reached the maximum power gain of 107 in the vacuum ultraviolet (VUV) region at wavelengths between 80 and 120 nm. At saturation the FEL emits short pulses with GW peak power and a high degree of transverse coherence. The radiation pulse length can be adjusted between 30 fs and 100 fs. Radiation spectra and fluctuation properties agree with the theory of high gain, single-pass free-electron lasers starting from shot noise.
Published: 2002

24. Superconducting TESLA cavities

Author: R. Bandelmann, D. Bloess, Angelo Bosotti, W. Singer, M. Fouaidy, K. Zapfe, S. Wolff, J. Weisend, T. Schilcher, M. Juillard, J. Wojtkiewicz, G. Weichert, L. Lilje, Matthias Liepe, A. Gössel, K. Rehlich, B. Bonin, P. D. Gall, M. Pekeler, B. Aune, Tomas Junquera, Hasan Padamsee, H. Kaiser, Peter Schmüser, B. Dwersteg, A. Matheisen, H. B. Peters, W.-D. Möller, A. Gamp, H. Safa, R. Lange, M. Ferrario, D. Trines, Jacek Sekutowicz, D. Hubert, K. Twarowski, S. Simrock, M. Kuchnir, Maury Tigner, M. Leenen, D. Reschke, D. Proch, J. Graber, D. A. Edwards, H. Edwards, Carlo Pagani, O. Peters, M. Hüning, C. Crawford, G. Deppe, Mark Champion, A. Mosnier, G. Kreps, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and TESLA
Subjects: Superconductivity, Physics, Nuclear and High Energy Physics, Test facility, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, Niobium, chemistry.chemical_element, Safety margin, Surfaces and Interfaces, XX, 01 natural sciences, 7. Clean energy, Nuclear magnetic resonance, chemistry, 0103 physical sciences, lcsh:QC770-798, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, Production (computer science), [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Atomic physics, 010306 general physics
Abstract: The conceptional design of the proposed linear electron-positron collider TESLA is based on 9-cell 1.3 GHz superconducting niobium cavities with an accelerating gradient of ${E}_{\mathrm{acc}}\ensuremath{\ge}25\mathrm{MV}/\mathrm{m}$ at a quality factor ${Q}_{0}\ensuremath{\ge}5\ifmmode\times\else\texttimes\fi{}{10}^{9}$. The design goal for the cavities of the TESLA Test Facility (TTF) linac was set to the more moderate value of ${E}_{\mathrm{acc}}\ensuremath{\ge}15\mathrm{MV}/\mathrm{m}$. In a first series of 27 industrially produced TTF cavities the average gradient at ${Q}_{0}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}5\ifmmode\times\else\texttimes\fi{}{10}^{9}$ was measured to be $20.1\ifmmode\pm\else\textpm\fi{}6.2\mathrm{MV}/\mathrm{m}$, excluding a few cavities suffering from serious fabrication or material defects. In the second production of 24 TTF cavities, additional quality control measures were introduced, in particular, an eddy-current scan to eliminate niobium sheets with foreign material inclusions and stringent prescriptions for carrying out the electron-beam welds. The average gradient of these cavities at ${Q}_{0}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}5\ifmmode\times\else\texttimes\fi{}{10}^{9}$ amounts to $25.0\ifmmode\pm\else\textpm\fi{}3.2\mathrm{MV}/\mathrm{m}$ with the exception of one cavity suffering from a weld defect. Hence only a moderate improvement in production and preparation techniques will be needed to meet the ambitious TESLA goal with an adequate safety margin. In this paper we present a detailed description of the design, fabrication, and preparation of the TESLA Test Facility cavities and their associated components and report on cavity performance in test cryostats and with electron beam in the TTF linac. The ongoing research and development towards higher gradients is briefly addressed.
Published: 2000

25. First observation of self-amplified spontaneous emission in a free-electron laser at 109 nm wavelength

Author: Rolf Treusch, M. Körfer, U. C. Müller, Philippe Piot, M. Wendt, Matthias Liepe, Petra Schütt, Thomas Weiland, E.L. Saldin, Daniele Sertore, Lu Fu Hai, V. Verzilov, V. V. Katelev, A. Bazhan, R. Lange, J. Kahl, K. Rehlich, Peter Schmüser, Martin Dohlus, P. Castro, Jacek Krzywinski, B. Sonntag, Jacek Sekutowicz, H. T. Edwards, Ingo Will, M. Leenen, M. Castellano, Thorsten Kamps, Frank Stephan, M. Maslov, A. Gamp, M. Jablonka, R. Brinkmann, Z. Sanok, M. Bernard, A. Novokhatski, P. Jurkiewicz, Valeri Ayvazyan, M. Werner, J. L. Kirchgessner, Rainer Wanzenberg, S. Simrock, M. Tonutti, S. Chel, U. Hahn, Mikhail Yurkov, Siegfried Schreiber, Martin Timm, H. Kaiser, W. Brefeld, Jörg Rossbach, R. Ischebek, Paolo Pierini, Carlo Pagani, G. Kreps, J. C. Bourdon, R. Lorenz, J. Lesrel, K. Zapfe, D. Trines, James Rosenzweig, D. Reschke, V. Gretchko, Hasan Padamsee, M. Desmons, A. Bosotti, I. Reyzl, B. Aune, P. Zhogolev, D. Proch, W.-D. Möller, B. Petersen, W. H. Hartung, J. Pflüger, Ch. Gerth, J. Menzel, Jochen R. Schneider, Y. Cho, Olivier Napoly, G. V. Walter, M. Ferrario, T. Vielitz, B. Sparr, F. Peters, S. Choroba, Klaus Flöttmann, J. Weisend, L. Catani, S. Wolff, V. Vogel, F. Zhou, T. Limberg, S. Buhler, S. Tazzari, A. Matheisen, V. Sytchev, Emil Trakhtenberg, J. M. Joly, A. Kabel, D. A. Edwards, Evgeny Schneidmiller, Luca Serafini, S. Roth, H. Weise, Maury Tigner, L. Kravchuk, Tomas Junquera, B. Leblond, J. Andruszkow, J. Feldhaus, T. Lokajczyk, R. Bakker, Gerhard Schmidt, H. J. Schreiber, M. Omeich, Paolo Michelato, D. Barni, N. Baboi, Wolfgang Sandner, F. Tazzioli, Meredith M. White, M. Geitz, M. Hüning, Sven Reiche, M. Fouaidy, Michael J. Fitch, P.K. Den Hartog, Lukasz Plucinski, B. Phung Ngoc, Bart Faatz, A. Mosnier, T. Garvey, W. Decking, E. R. Colby, C. Magne, V. Balakin, Efim Gluskin, Lu Hui Hua, Stefan Setzer, D. Hubert, Holger Schlarb, G. Materlik, Jean-Paul Carneiro, M. Juillard, A. Liero, Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), TESLA, and Robert, Suzanne
Subjects: Accelerator Physics (physics.acc-ph), Amplified spontaneous emission, Self-amplified spontaneous emission, FOS: Physical sciences, General Physics and Astronomy, 7. Clean energy, 01 natural sciences, law.invention, Optics, law, 0103 physical sciences, Spectral width, ddc:550, Spontaneous emission, Stimulated emission, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, Physics, 010308 nuclear & particles physics, business.industry, Free-electron laser, Gain, Laser, 3. Good health, [PHYS.PHYS.PHYS-INS-DET] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Physics::Accelerator Physics, Physics - Accelerator Physics, Atomic physics, business
Abstract: We present the first observation of Self-Amplified Spontaneous Emission (SASE) in a free-electron laser (FEL) in the Vacuum Ultraviolet regime at 109 nm wavelength (11 eV). The observed free-electron laser gain (approx. 3000) and the radiation characteristics, such as dependency on bunch charge, angular distribution, spectral width and intensity fluctuations all corroborate the existing models for SASE FELs., 6 pages including 6 figures; e-mail: joerg.rossbach@desy.de
Published: 2000

26. The TESLA 500 cryogenic system layout

Author: D. Trines, T.J. Peterson, and G. Horlitz
Subjects: Superconductivity, Physics, Nuclear engineering, Instrumentation, Niobium, chemistry.chemical_element, Refrigeration, Particle accelerator, Cryogenics, Linear particle accelerator, law.invention, Resonator, Nuclear magnetic resonance, Engineering, chemistry, law
Abstract: The superconducting 2 x 250 GeV e+e- linear accelerator TESLA is composed of a series of high frequency resonators (cavities), fabricated of high purity niobium. It has to be operated at a temperature of ca. 2 K. A nominal refrigeration power of about 51 KW at 2 K, 37 KW at 4.5 K and 314 KW at 40/80 K is required. The cooling power has to be distributed over a distance of more than 30 km, Different aspects of the cryogenic system are discussed.
Published: 1995

27. A 1.8 K Test Facility for Superconducting RF Cavities

Author: T.J. Peterson, U. Knopf, B. Petersen, D. Sellmann, D. Trines, R. Lange, and G. Horlitz
Subjects: Cryostat, Nuclear physics, Physics, Liquid helium, law, Nuclear engineering, Refrigeration, DESY, Particle accelerator, Cryogenics, Collider, Linear particle accelerator, law.invention
Abstract: To demonstrate the feasibility of superconducting RF technology for a high energy e+/e- collider, a research and development program has begun with collaborators from Europe, Asia, and North America. The immediate goal of the R&D program is to build and operate a 50 meter-long linac at DESY with 1.3 GHz superconducting RF cavities at a temperature of 1.8 K - 2.0 K and an accelerating gradient of 15 MV/meter. The refrigeration for the test system at DESY initially will have a capacity of about 100 W at 1.8 K, distributed among three test cryostats. In a second step, refrigeration will be upgraded to 200 W at 1.8 K in order to supply the 50 meter test linac. This paper describes the cryogenics of this test system.
Published: 1994

28. 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

29. 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

30. 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

31. RHO-RHO production by two photon scattering

Author: P. Schmüser, H. M. Fischer, J. Rimkus, V. Kadansky, D. Notz, H. U. Martyn, R. Rüsch, J. Pyrlik, H. L. Lynch, Gl Salmon, B. Löhr, P. Joos, B. Foster, A. Schultz von Dratzig, Walter Dr. Hillen, H. Hartmann, T. Meyer, John Freeman, M. Ogg, Georg Zobernig, G. Peise, H. Boerner, M. Wollstadt, K. W. Bell, R. Riethmüller, A. Ladage, Rj Cashmore, U. Karshon, H. Hultschig, W. G. Jones, J. Proudfoot, P. Koehler, S. Yarker, John Illingworth, P. Mättig, D. G. Cassel, W. Koch, B. H. Wiik, John Hart, P. L. Woodworth, N. A. Downie, R. Wedemeyer, Norbert Wermes, G. Poelz, Sau Lan Wu, T. R. Wyatt, H. G. Sander, B. Roe, H. Kowalski, D. R. Quarrie, U. Kötz, K. Lübelsmeyer, D. A. Garbutt, P. Söding, R.C.E. Devenish, P. Grossmann, D. M. Binnie, E. Hilger, D. Pandoulas, M. Holder, K. Gather, H. Burkhardt, P. Lecomte, R. Brandelik, D. Revel, Gy. Wolf, Y. Eisenberg, E.E. Ronat, W. Braunschweig, D. Lüke, G. Knop, G. Mikenberg, D. Heyland, D.W. Schmitz, P. J. Dornan, R. Fohrmann, P. Leu, Ehud Duchovni, D. H. Saxon, O. Römer, Stephen Lloyd, A. Shapira, D. Trines, W. Wallraff, Hermann Kolanoski, J. K. Sedgbeer, C. Youngman, L. Koepke, Roger Barlow, M. Schliwa, and I. C. Brock
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Two-photon excitation microscopy, Scattering, Electron–positron annihilation
Published: 1980

32. 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

33. 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

34. 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

35. Upper limits on the production rate of the decuplet baryons Δ andΣ* ine + e − annihilation at 34.4 GeV

Author: H. Siebke, M. Winik, C. Youngman, H. M. Fischer, W. G. Jones, R. Riethmüller, H. Venkataramania, J. Pyrlik, H. Kowalski, E. Hilger, M. Takashima, Ehud Duchovni, R.C.E. Devenish, R. J. Cashmore, P. L. Woodworth, T. Tymieniecka, D. Trines, J. McCardle, E.E. Ronat, U. Kötz, H. U. Martyn, B. Löhr, M. G. Bowler, Stephanie Brandt, Philip Bull, D. A. Garbutt, A. Eskreys, R. J. Nowak, W. Wallraff, Hermann Kolanoski, J. K. Sedgbeer, P. Joos, K. Gather, J. Harvey, Georg Zobernig, G. Knop, D. Pandoulas, W. A. T. Wan Abdullah, T. Kracht, G. Mikenberg, H. Hartmann, R. Beuselinck, P. Schmüser, P. E. L. Clarke, C. Jenkins, E. Wicklund, Gy. Wolf, K. W. Bell, P. Mättig, U. Karshon, W. Scütte, A. Caldwell, V. Mertens, Stephen Lloyd, A. Jocksch, K. H. Mess, A. Ladage, G. Baranko, T. D. Jones, G. Poelz, M. Althoff, Ch. Xiao, D. K. Hasell, G. Kreutz, P. Rosskamp, D. Notz, P. J. Dorman, H. Kück, K. U. Pösnecker, B. Foster, D. M. Binnie, P. Grossmann, Joseph Izen, R. Wedemeyer, D. Strom, A. Shapira, K. Lübelsmeyer, M. Rushton, G. Rudolph, B. Neumann, F. J. Kirschfink, M. Holder, H. Hultschig, Michael Dittmar, B. H. Wiik, John Hart, G. Yekutieli, Sau Lan Wu, Y. Eisenberg, W. Braunschweig, C. M. Hawkes, Fernando Barreiro, E. Lohrmann, J. Eisenmann, Hl Krasemann, M. Mermikides, D. Revel, R. Mir, D. H. Saxon, L. Köpke, M. Cherney, P. Leu, J. Thomas, H. G. Sander, G. E. Forden, D. Lüke, S. Ritz, D.W. Schmitz, A. J. Campbell, and R. Fohrmann
Subjects: Physics, Nuclear physics, Baryon, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Octet, Electron–positron annihilation, Invariant mass, Strangeness, Spectral line, Production rate
Abstract: Samples of ∼1,900 identified protons and ∼500 Λ have been used to search for decuplet baryon production ine+e− annihilation at a c.m. energy of 34.4 GeV. Thep π+ and Λ π± invariant mass spectra contain no Δ orΣ* signals. Upper limits, at 95% confidence level, are that less than 12% of allp and less than 26% of all Λ come from the decay of doubly charged Δ and singly chargedΣ* states respectively. These limits correspond to production rates of
Published: 1984

36. Comparison of the Yields of Inelastic Electron and Positron Scattering from Hydrogen and Deuterium at 15(GeV/c)2

Author: Richard E. Taylor, D. Trines, Elliott D. Bloom, C. Y. Prescott, S. Stein, D.H. Coward, L.S. Rochester, DeStaebler Hc, M. Mestayer, W. B. Atwood, and R.L.A. Cottrell
Subjects: Physics, Nuclear reaction, Antiparticle, Positron, Deuterium, Hydrogen, chemistry, Scattering, General Physics and Astronomy, chemistry.chemical_element, Electron, Inelastic scattering, Atomic physics
Abstract: We have measured the ratio, Y/sup +//Y/sup -/, of positron to electron inelastic scattering yields from hydrogen and deuterium at Q/sup 2/, the square of the four-momentum transfer, between 2.4 and 14.9 (GeV/c)/sup 2/. The ratios are consistent with Y/sup +//Y/sup -/=1 to within errors of a few percent. (AIP)
Published: 1976

37. 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

38. 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

39. 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

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

Author: M. Holder, K. Gather, G. Mikenberg, H. L. Lynch, E. Hilger, D. R. Quarrie, D. Trines, R. Beuselinck, A. Schultz von Dratzig, W. Wallraff, Hermann Kolanoski, J. K. Sedgbeer, L. Köpke, P. Mättig, H. M. Fischer, T. D. Jones, W. Koch, D. H. Saxon, R. Brandelik, Georg Zobernig, D. M. Binnie, K. W. Bell, H. G. Sander, G. Poelz, H. Hartmann, F. J. Kirschfink, John Freeman, G. Rudolph, I. Al-Agil, M. Ogg, W. G. Jones, D. Notz, S. Cooper, M. Wollstadt, R.C.E. Devenish, R. Rüsch, P. Grossmann, E.E. Ronat, Juergen Thomas, P. Joos, B. Foster, Hl Krasemann, G. Knop, John Illingworth, P. L. Woodworth, A. Shapira, Walter Dr. Hillen, G. Peise, R. J. Cashmore, R. Riethmüller, U. Kötz, Gy. Wolf, R. A. Stern, E. Wicklund, H. U. Martyn, S. Yarker, J. Proudfoot, Norbert Wermes, D. A. Garbutt, J. Rimkus, Gl Salmon, H. Hultschig, B. H. Wiik, H. Burkhardt, John Hart, H. Kowalski, T. R. Wyatt, T. Meyer, Sau Lan Wu, A. Ladage, J. Pyrlik, P. Schmüser, Ehud Duchovni, U. Karshon, K. Lübelsmeyer, P. Leu, D. Lüke, P. Söding, Stephen Lloyd, D. Heyland, K. H. Mess, D.W. Schmitz, P. J. Dornan, A. J. Campbell, R. Fohrmann, D. Pandoulas, D. Revel, P. Lecomte, O. Römer, C. Youngman, I. C. Brock, Y. Eisenberg, M. G. Bowler, H. Boerner, W. Braunschweig, T. Barklow, and R. Wedemeyer
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Annihilation, Production (economics), Energy (signal processing)
Published: 1981

41. 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

42. 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

43. Determination of α s in first and second order QCD frome + e − annihilation into hadrons

Author: E.E. Ronat, V. Mertens, G. Knop, D.W. Schmitz, H. Venkataramania, B. Neumann, P. J. Dornan, M. Holder, H. Hultschig, E. Hilger, B. H. Wiik, R. Mir, C. Youngman, R. Fohrmann, John Hart, Sau Lan Wu, W. Wallraff, Philip Bull, E. Lohrmann, C. Jenkins, Rj Cashmore, J. Harvey, R. Wedemeyer, Ehud Duchovni, G. E. Forden, G. Baranko, K. U. Pösnecker, D. Strom, A. Ladage, J. Eisenmann, D. Lüke, P. Rosskamp, W. Schütte, Fernando Barreiro, T. Barklow, T. D. Jones, U. Karshon, M. Takashima, R. J. Nowak, D. H. Saxon, M. Rushton, A. Eskreys, G. Rudolph, D. Pandoulas, H. U. Martyn, B. Löhr, F. J. Kirschfink, A. Shapira, P. Joos, U. Kötz, P. Grossmann, H. Siebke, D. A. Garbutt, E. Wicklund, M. G. Bowler, J. Pyrlik, J. McCardle, M. Winik, H. Kowalski, M. Mermikides, D. Revel, T. Kracht, Giora Mikenberg, P. Leu, D. K. Hasell, K. J. Sedgbeer, Hl Krasemann, P. Mättig, Hermann Kolanoski, R. Beuselinck, M. Althoff, D. Notz, L. Köpke, B. Foster, D. M. Binnie, M. Cherney, Gy. Wolf, Stephanie Brandt, A. Caldwell, J. Thomas, A. Jocksch, G. Yekutieli, K. W. Bell, H. G. Sander, Joseph Izen, Stephen Lloyd, Ch. Xiao, H. M. Fischer, H. Hartmann, G. Kreutz, D. Trines, Michael Dittmar, K. Gather, Georg Zobernig, H. Kück, Y. Eisenberg, W. Braunschweig, C. M. Hawkes, T. Tymieniecka, K. Lübelsmeyer, W. G. Jones, W. A. T. Wan Abdullah, P. E. L. Clarke, R.C.E. Devenish, and G. Poelz
Subjects: Quantum chromodynamics, Physics, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Electron–positron annihilation, media_common.quotation_subject, Hadron, Asymmetry, Spectral line, Gluon, Nuclear physics, Bibliography, High Energy Physics::Experiment, media_common
Abstract: Multihadron events produced bye+e− annihilation at a c.m. energy of 34.6 GeV have been used to determine αs. The predictions of 1 st and 2nd order QCD models with independent jet and string fragmentation have been compared to a large variety of kinematic variables such as event shapes, transverse momentum spectra, jet masses, 3-cluster thrust and the asymmetry of energy-energy correlations. The value of αs has been found to depend on the variables used, on the fragmentation model and on the treatment of soft gluons in the 2nd order QCD calculation. Within the models considered αs has been found in complete 2nd order QCD to lie between 0.12 and 0.23.
Published: 1984

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

Author: I. Al-Agil, M. Wollstadt, J. McCardle, K. Gather, G. Mikenberg, Gy. Wolf, R. Beuselinck, M. G. Bowler, H. Kowalski, C. Youngman, D. Revel, Y. Eisenberg, P. E. L. Clarke, H. U. Martyn, J. K. Sedgebeer, P. Grossmann, L. Köpke, R. J. Cashmore, M. Cherney, H. Burkhardt, R.C.E. Devenish, G. Rudolph, H. G. Sander, J. Rimkus, W. Braunschweig, D. R. Quarrie, Gl Salmon, Ehud Duchovni, H. Venkataramania, D. Trines, J. Franzke, U. Kötz, T. Meyer, T. D. Jones, W. G. Jones, H. Kück, A. Ladage, J. Pyrlik, P. Schmüser, D. A. Garbutt, John Illingworth, S. J. Cooper, P. L. Woodworth, F. J. Kirschfink, M. Althoff, H. M. Fischer, D. Notz, E. Hilger, W. Wallraff, M. Holder, Hermann Kolanoski, Walter Dr. Hillen, G. Peise, H. Hultschig, Georg Zobernig, B. H. Wiik, John Hart, H. Hartmann, W. Koch, Sau Lan Wu, B. Löhr, K. Lübelsmeyer, R. Brandelik, G. Poelz, J. Proudfoot, P. Söding, T. Barklow, P. Joos, E. Wicklund, D. Pandoulas, Stephen Lloyd, D. Heyland, H. Siebke, K. H. Mess, G. Yekutieli, T. R. Wyatt, K. W. Bell, P. Mättig, E.E. Ronat, G. Knop, Norbert Wermes, Juergen Thomas, R. Wedemeyer, B. Foster, D. M. Binnie, A. Shapira, U. Karshon, I. C. Brock, D. Hochman, H. Boerner, R. Carnegie, E. Lohrmann, Hl Krasemann, D. Lüke, P. Leu, D.W. Schmitz, P. J. Dornan, A. J. Campbell, R. Fohrmann, R. Riethmüller, J. Harvey, D. H. Saxon, and W. Schütte
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle decay, Pair production, Meson, Branching fraction, Hadron, Elementary particle, Atomic physics, Helicity, Lepton
Abstract: We have observed exclusive production of K + K − and K S O K S O pairs and the excitation of the f′(1515) tensor meson in photon-photon collisions. Assuming the f′ to be production in a helicity 2 state, we determine Λ( f ′ → γγ) B( f ′ → K K ) = 0.11 ± 0.02 ± 0.04 keV . The non-strange quark of the f′ is found to be less than 3% (95% CL). For the θ(1640) we derive an upper limit for the product Λ(θ rarr; γγ K K ) keV (95% CL ) .
Published: 1983

45. Determination of the average lifetime of bottom hadrons

Author: B. Löhr, P. Joos, B. Foster, W. Schütte, Fernando Barreiro, H. Siebke, M. Takashima, E. Wicklund, Y. Eisenberg, Malte Hildebrandt, D. Strom, D. J. Mellor, W. Braunschweig, K. W. Bell, P. Mättig, C. M. Hawkes, Gy. Wolf, Ehud Duchovni, D. Trines, G. Baranko, M. Rushton, G. Poelz, M. Mermikides, D. Revel, C. Jenkins, Rj Cashmore, D. K. Hasell, G. Rudolph, P. Leu, A. Eskreys, R. Mir, A. Ladage, D. H. Saxon, M. G. Bowler, H. Hartmann, Hermann Kolanoski, J. K. Sedgbeer, H. Venkataramania, R.C.E. Devenish, U. Karshon, P. Rosskamp, D.W. Schmitz, T. D. Jones, J. Pyrlik, G. Yekutieli, P. J. Dornan, A. J. Campbell, E. Hilger, R. Fohrmann, M. Althoff, A. Jocksch, P. Grossmann, D. Notz, M. Cherney, Joseph Izen, T. Kracht, G. E. Forden, A. Caldwell, J. Thomas, G. Kreutz, J. McCardle, H. M. Fischer, Wolfram Dietrich Zeuner, D. Lüke, Stephen Lloyd, S. Ritz, K. Gather, T. Tymieniecka, D. Pandoulas, U. Kötz, V. Mertens, Giora Mikenberg, R. Beuselinck, D. A. Garbutt, C. Youngman, R. J. Nowak, P. Dauncey, Georg Zobernig, B. Neumann, R. Wedemeyer, W. Wallraff, Philip Bull, H. Kück, H. U. Martyn, J. Harvey, K. U. Pösnecker, E.E. Ronat, G. Knop, A. Shapira, M. Dittmar, M. Holder, H. Hultschig, John Hart, Sau Lan Wu, E. Lohrmann, J. Eisenmann, F. J. Kirschfink, S. Brandt, H. Kowalski, Hl Krasemann, D. M. Binnie, W. G. Jones, W. A. T. Wan Abdullah, and P. E. L. Clarke
Subjects: Nuclear physics, Physics, Quark, Semileptonic decay, Nuclear and High Energy Physics, Particle physics, Annihilation, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, High Energy Physics::Experiment
Abstract: We have determined the average lifetime of hadrons containing b quarks produced in e+e− annihilation to be τ B = 1.83 +0.83 +0.37 − −0.34 ×10 −12 s . Our method uses charged decay products from both non-leptonic and semileptonic decay modes.
Published: 1984

46. Observation of production in e+e− anihilation

Author: W. G. Jones, Ehud Duchovni, H. Venkataramania, B. Löhr, C. Youngman, D. Trines, P. Joos, F. J. Kirschfink, B. Foster, P. L. Woodworth, J. Harvey, J. Pyrlik, E. Wicklund, Gl Salmon, E. Hilger, W. Schütte, Fernando Barreiro, W. Wallraff, C. Jenkins, I. C. Brock, M. G. Bowler, M. Holder, H. Hultschig, Hermann Kolanoski, J. K. Sedgbeer, D. Strom, Joseph Izen, D. Lüke, A. Jocksch, J. Rimkus, M. Rushton, B. H. Wiik, John Hart, A. Ladage, D. M. Binnie, Y. Eisenberg, D. R. Quarrie, M. Dittmar, W. Braunschweig, M. Althoff, D. Notz, H. M. Fischer, G. Rudolph, Sau Lan Wu, R. Wedemeyer, E. Lohrmann, P. Grossmann, Georg Zobernig, J. McCardle, K. Gather, D. Pandoulas, Ch. Xiao, M. Mermikides, D. Revel, G. Mikenberg, R. Beuselinck, P. Rosskamp, W. Koch, R. Mir, B. Neumann, R. J. Cashmore, Gy. Wolf, T. Barklow, Tegid Jones, G. Poelz, U. Kötz, M. Wollstadt, Norbert Wermes, P. Leu, G. Yekutieli, E.E. Ronat, A. Caldwell, Stephen Lloyd, R.C.E. Devenish, H. Siebke, D. A. Garbutt, K. H. Mess, T. R. Wyatt, G. Knop, H. Hartmann, K. W. Bell, P. Mättig, D.W. Schmitz, A. Shapira, P. J. Dornan, Hl Krasemann, A. J. Campbell, J. Proudfoot, T. Kracht, L. Köpke, R. Fohrmann, M. Cherney, Walter Dr. Hillen, G. Peise, H. G. Sander, U. Karshon, K. Lübelsmeyer, D. H. Saxon, D. Heyland, Juergen Thomas, H. Kowalski, W. A. T. Wan Abdullah, P. E. L. Clarke, H. Kück, and H. U. Martyn
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Annihilation, Electron–positron annihilation, Hadron, Event (particle physics)
Abstract: We present evidence for the production of Ξ· − , Ξ − in e+e− annihilation into hadrons. Our measurements yields: 0.026 ± 0.008 (stat.) ± 0.009 (syst.) Ξ − , Ξ − per hadronic event at W ∼ 34 GeV. Using our previous measurements of Λ, Λ and p, p production we obtain the relative yields (Ξ − , Ξ − /(Λ, Λ = 0.087 ± 0.03 ( stat. ) ± 0.03 ( syst. ) and (Ξ − , Ξ − /( p , p = 0.033 ± 0.011 ( stat. ) ± 0.011 ( syst. ) .
Published: 1983

47. RatioσLσTfrom deep-inelastic electron scattering

Author: L.S. Rochester, C. Y. Prescott, S. Stein, R.L.A. Cottrell, W. B. Atwood, Elliott D. Bloom, D. Trines, DeStaebler Hc, M. Mestayer, and Richard E. Taylor
Subjects: Physics, Distribution (mathematics), Scattering, Structure function, Sigma, Electron, Atomic physics, Inelastic scattering, Deep inelastic scattering, Table (information)
Abstract: Values of R = sigma/sub L//sigma/sub T/ for deep-inelastic electron-nucleon scattering have been derived from several experiments with incident electron energies up to 20 GeV. Included are previously unpublished measurements at intermediate angles (largely at 15/sup 0/ and 18/sup 0/). An average value of R = 0.22 +- 0.1 is obtained for the kinematic region covered by the experiments. No significant kinematic dependence of R is observed. A table of extracted values of the structure functions ..nu..W/sub 2/ and 2MW/sub 1/ is also presented.
Published: 1983

48. Inelastic electron scattering from hydrogen at 50° and 60°

Author: Elliott D. Bloom, M. Mestayer, L.S. Rochester, S. Stein, W. B. Atwood, Richard E. Taylor, DeStaebler Hc, D. Trines, R.L.A. Cottrell, and C. Y. Prescott
Subjects: Physics, Nuclear and High Energy Physics, Cross section (physics), X-ray Raman scattering, Scattering, Dynamic structure factor, High Energy Physics::Experiment, Scattering length, Mott scattering, Inelastic scattering, Atomic physics, Inelastic neutron scattering
Abstract: Inelastic electron scattering cross sections have been measured for four-momentum transfers between 4.1 GeV 2 and 30.5 GeV 2 . At the large scattering angles of this experiment, the dominant contribution to the cross section comes from the W 1 structure function. In the conventional scaling variables, x and x ′, this structure function does not exhibit scaling behavior, and at fixed x or x ′ it is found to decrease with increasing four-momentum transfer.
Published: 1976

49. Study of intermittency in electron-positron annihilation into hadrons

Author: J. Krüger, H. Hartmann, A. Ladage, H. U. Martyn, D. Trines, U. Karshon, J. M. Pawlak, R. Gerhards, Janusz Chwastowski, Y. Eisenberg, R. Wedemeyer, D. Notz, G. P. Heath, D. Muller, N. Wainer, R. Walczak, E. Lohrmann, J. F. Hassard, A. Jocksch, H. M. Fischer, W. Braunschweig, K. U. Pösnecker, A. Leites, Jens Hartmann, Philip Burrows, M. Takashima, G. Poelz, Giora Mikenberg, A. Montag, Georg Zobernig, A. Shapira, D. Su, G. Yekutieli, J. Del Peso, T. Kracht, D. M. Binnie, E. Bernardi, K. Genser, Fernando Barreiro, D. H. Saxon, D. Lüke, S. Ritz, B. Löhr, P. Joos, B. Foster, D. Revel, A. Eskreys, A. J. Martin, A. Caldwell, Gy. Wolf, Hermann Kolanoski, J. Shulman, M. E. Veitch, H. Kowalski, Ian R Tomalin, Stephanie Brandt, E.E. Ronat, F. J. Kirschfink, M. Holder, H. Hultschig, John Hart, Sau Lan Wu, Eduardo Ros, E. Hilger, and Wolfram Dietrich Zeuner
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Electron–positron annihilation, Hadron, Elementary particle, Sphericity, law.invention, Nuclear physics, Azimuth, law, Intermittency, High Energy Physics::Experiment, Rapidity, Nuclear Experiment
Abstract: Intermittency effects have been studied directly for the first time in e + e − annihilation, using 37 509 hadronic events at an average CM energy of 〈√ s 〉=35 GeV. The factorial moments F 2 , F 3 and F 4 are given for the rapidity distribution and for the two-dimensional distributions in rapidity and azimuthal angle. The effects of cuts in sphericity and particle momentum are large. Comparison with several fragmentation models are made; some models like the Lund model with O(α s 2 ) matrix element give a qualitative description of the phenomena. The importance of detector effects is demonstrated. The results are discussed in terms of various suggested interpretations of this effect.
Published: 1989

50. The 19 GeV e+ - e- Storage Ring Petra

Author: G.-A. Voss, W. Bothe, E. Dasskowski, D. Degele, C. Dehne, A. Febel, H. Frese, H. Gerke, G. Hemmie, G. Hochweller, K. Holm, G. Horlitz, H. Kaiser, J. Kewisch, D. Kohaupt, R. Kose, J. Kouptsidis, W. Krechlock, W. Kriens, A. Krolzig, H. Kumpfert, M. Leneke, F. Loeffler, J. Mais, H. Musfeldt, H. Narciss, H. Nesemann, S. Patzold, R. Pamperin, F. Peters, J. Peters, H. Pingel, A. Piwinski, W. Radloff, J. Rosbach, R. Rossmanith, F. Schwickert, K. Steffen, D. Trines, G. A. Voss, H. Wagner, K. Wille, S. Wolff, A. Wrulich, and H. Wumpelmann
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Nuclear Energy and Engineering, Delta modulation, business.industry, Authorization, Electrical engineering, Acceleration (differential geometry), Electrical and Electronic Engineering, business, Storage ring
Published: 1979

Catalog

Books, media, physical & digital resources

See catalog results

Searchworks

Select search scope, currently: Articles Catalog books, media & more in Jio Institute collections Articles journal articles & other e-resources

Search

Search Constraints

Refine your results

Search Limiters

Topic

Publication Year Range

Language

Publication Type

Journal

Database

Publisher

95 results on '"D. Trines"'

Search Results

Catalog

Select search scope, currently: Articles

Catalog

books, media & more in Jio Institute collections

Articles

journal articles & other e-resources