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11 results on '"E. Lohrmann"'

1. 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
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2. 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

3. Study ofη production in two-photon collisions

Author

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

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

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

Published
1989
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4. Jet fragmentation and QCD models ine + e − annihilation at c.m. energies between 12.0 and 41.5 GeV

Author

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

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

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

Published
1988
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5. 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
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6. 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
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7. 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
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8. 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
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9. A detailed study of strange particle production ine + e − annihilation at high energy

Author

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

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

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

Published
1985
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10. A search for particles with magnetic charge produced ine +e− annihilations at 543-1543-1543-1GeV

Author

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

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

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

Published
1988
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11. Measurement of the two-photon reaction γγ →π+π-π+π- at large values of Q2

Author

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

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

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

Published
1988

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