A
A. Petersen
Researcher at University of Hamburg
Publications - 77
Citations - 2659
A. Petersen is an academic researcher from University of Hamburg. The author has contributed to research in topics: Annihilation & Electron–positron annihilation. The author has an hindex of 26, co-authored 77 publications receiving 2602 citations.
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Journal ArticleDOI
Experimental Investigation of the Energy Dependence of the Strong Coupling Strength
S. Bethke,John Allison,K. Ambrus,Roger Barlow,W. Bartel,C. K. Bowdery,S. L. Cartwright,J. T.M. Chrin,D. Clarke,A. Dieckmann,I. P. Duerdoth,G. Eckerlin,E. Elsen,R. Felst,Alexander Finch,F. Foster,T. Greenshaw,J. Hagemann,D. Haidt,J. Heintze,G. Heinzelmann,K. H. Hellenbrand,P. Hill,Gareth Hughes,H. Kado,Kiyotomo Kawagoe,Claus Kleinwort,G. Knies,T. Kobayashi,S. Komamiya,H. Krehbiel,J. von Krogh,M. Kuhlen,F. K. Loebinger,A. A. Macbeth,N. Magnussen,R. Marshall,R. Meinke,R. P. Middleton,Makoto Minowa,P. G. Murphy,B. Naroska,J. M. Nye,J. E. Olsson,F. Ould-Saada,A. Petersen,R. Ramcke,H. Rieseberg,D. Schmidt,H. vd Schmitt,L. Smolik,U. Schneekloth,J. A.J. Skard,J. Spitzer,P. Steffen,K. Stephens,A. Wagner,I. W. Walker,P. Warming,G. Weber,M. Zimmer,G. T. Zorn +61 more
TL;DR: In this article, the energy dependence of the relative production rate of three-jet events is studied in hadronic e+e− annihilation events at center of mass energies between 22 and 46.7 GeV.
Journal ArticleDOI
Experimental studies on multijet production in e+e- annihilation at PETRA energies
W. Bartel,L. Becker,R. Felst,D. Haidt,G. Knies,H. Krehbiel,P. Laurikainen,N. Magnussen,R. Meinke,B. Naroska,J. E. Olsson,D. Schmidt,G. Dietrich,T. Greenshaw,J. Hagemann,G. Heinzelmann,H. Kado,Claus Kleinwort,M. Kuhlen,A. Petersen,R. Ramcke,U. Schneekloth,G. Weber,K. Ambrus,S. Bethke,A. Dieckmann,E. Elsen,Joachim Heintze,K. H. Hellenbrand,S. Komamiya,J. von Krogh,H. Rieseberg,Hans von der Schmitt,L. Smolik,J. Spitzer,A. P. Wagner,M. Zimmer,C. K. Bowdery,A. J. Finch,F. Foster,G. Hughes,J. M. Nye,J. Allison,R. J. Barlow,J. T.M. Chrin,I. P. Duerdoth,F. K. Loebinger,A. A. Macbeth,H. E. Mills,P. G. Murphy,K. Stephens,P. Warming,R. G. Glasser,P. Hill,J. A.J. Skard,Stephen Robert Wagner,G. T. Zorn,S. L. Cartwright,D. Clarke,R. Marshall,R. P. Middleton,Kiyotomo Kawagoe,Tetsuro Mashimo,Tohru Takeshita,Shinya Yamada +64 more
TL;DR: In this article, the authors compared 2nd-order QCD calculations with 3-and 4-jet models in the energy range of 14.0-46.7 GeV and showed that the observed excess of spherical events can partially be explained by the production of multi-parton events expected from higher order QCD contributions.
Journal ArticleDOI
Observation of planar three-jet events in e+e− annihilation and evidence for gluon bremsstrahlung
W. Bartel,T. Canzler,D. Cords,P. Dittmann,R. Eichler,R. Felst,D. Haidt,S. Kawabata,H. Krehbiel,B. Naroska,L. H. O'Neill,J. E. Olsson,P. Steffen,W. L. Yen,E. Elsen,M. Helm,A. Petersen,P. Warming,G. Weber,H. Drumm,J. Heintze,G. Heinzelmann,R. D. Heuer,J. von Krogh,P. Lennert,H. Matsumura,T. Nozaki,H. Rieseberg,A. Wagner,D.C. Darvill,F. Foster,Gareth Hughes,H. Wriedt,John Allison,J. Armitage,I. P. Duerdoth,J. F. Hassard,F. K. Loebinger,B. T. King,A. A. Macbeth,H. E. Mills,P. G. Murphy,Harrison Prosper,K. Stephens,D. Clarke,M. C. Goddard,R. Hedgecock,R. Marshall,G. F. Pearce,Masatoshi Imori,T. Kobayashi,Sachio Komamiya,M. Koshiba,Makoto Minowa,S. Orito,A. Sato,Takafumi Suda,H. Takeda,Y. Totsuka,Yosuke Watanabe,Shoichi Yamada,C. Yanagisawa +61 more
TL;DR: In this paper, the topological distribution of charged and neutral hadrons from the reaction e+e− → multihadrons is studied at √s of about 30 GeV, and an excess of planar events is observed at a rate which cannot be explained by statistical fluctuations in the standard two-jet process.
Journal ArticleDOI
Total cross section for hadron production by e+e− annihilation at petra energies
W. Bartel,T. Canzler,D. Cords,P. Dittmann,R. Eichler,R. Felst,E. Gadermann,D. Haidt,S. Kawabata,H. Krehbiel,B. Naroska,L. H. O'Neill,J. E. Olsson,P. Steffen,W. L. Yen,E. Elsen,M. Helm,A. Petersen,H. Riege,P. Warming,G. Weber,H. Drumm,W. Farr,J. Heintze,G. Heinzelmann,R. D. Heuer,J. von Krogh,P. Lennert,H. Matsumura,T. Nosaki,H. Rieseberg,A. Wagner,John Allison,J. Armitage,I. P. Duerdoth,F. K. Loebinger,A. A. Macbeth,H. E. Mills,D. Mercer,P. G. Murphy,Harrison Prosper,K. Stephens,D.C. Darvill,F. Foster,Gareth Hughes,H. Wriedt,D. Clarke,M. C. Goddard,R. Hedgecock,R. Marshall,G. F. Pearce,Masatoshi Imori,Tatsuo Kobayashi,Sachio Komamiya,M. Koshiba,Makoto Minowa,S. Orito,A. Sato,T. Suda,H. Takeda,Y. Totsuka,Yosuke Watanabe,Shoichi Yamada,C. Yanagisawa +63 more
TL;DR: In this article, the authors measured the total cross section in units of the point-like e+e− → μ+μ- cross section at the highest PETRA energies and found that the observed average multiplicity, together with existing low energy data, indicate a rapid increase in multiplicity with increasing energy.
Journal ArticleDOI
Experimental study of jets in electron-positron annihilation
W. Bartel,D. Cords,P. Dittmann,R. Eichler,R. Felst,D. Haidt,H. Krehbiel,B. Naroska,L. H. O'Neill,P. Steffen,H. Wenninger,Y. Zhang,E. Elsen,M. Helm,A. Petersen,P. Warming,G. Weber,S. Bethke,H. Drumm,J. Heintze,G. Heinzelmann,K. H. Hellenbrand,R. D. Heuer,J. von Krogh,P. Lennert,S. Kawabata,H. Matsumura,T. Nozaki,J. Olsson,H. Rieseberg,A. Wagner,A. Bell,F. Foster,Gareth Hughes,H. Wriedt,John Allison,A. H. Ball,G. Bamford,Roger Barlow,C. Bowdery,I. P. Duerdoth,J. F. Hassard,B. T. King,F. K. Loebinger,A. A. Macbeth,Hugh McCann,H. E. Mills,P. G. Murphy,Harrison Prosper,K. Stephens,D. Clarke,M. C. Goddard,R. Marshall,G. F. Pearce,Masatoshi Imori,T. Kobayashi,Sachio Komamiya,M. Koshiba,Makoto Minowa,Mitsuaki Nozaki,S. Orito,A. Sato,Takafumi Suda,H. Takeda,Y. Totsuka,Yosuke Watanabe,Shoichi Yamada,C. Yanagisawa +67 more
TL;DR: In this article, data on hadron production by e+e−−-annihilation at c.m. energies between 30 GeV and 36 GeV are presented and compared with two models both based on first-order QCD but using different schemes for the fragmentation of quarks and gluons into hadrons.