L
L. Köpke
Researcher at University of Bonn
Publications - 35
Citations - 1106
L. Köpke is an academic researcher from University of Bonn. The author has contributed to research in topics: Electron–positron annihilation & Annihilation. The author has an hindex of 22, co-authored 35 publications receiving 1090 citations.
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Journal ArticleDOI
Jet Production and Fragmentation in E+e- Annihilation at 12-43 Gev
M. Althoff,W. Braunschweig,F. J. Kirschfink,K. Lübelsmeyer,H. U. Martyn,G. Peise,J. Rimkus,P. Rosskamp,H. G. Sander,D.W. Schmitz,H. Siebke,W. Wallraff,H. M. Fischer,H. Hartmann,Walter Dr. Hillen,A. Joksch,G. Knop,L. Köpke,Hermann Kolanoski,H. Kück,V. Mertens,R. Wedemeyer,Norbert Wermes,M. Wollstadt,Y. Eisenberg,K. Gather,H. Hultschig,P. Joos,W. Koch,U. Kötz,H. Kowalski,A. Ladage,B. Löhr,D. Lüke,P. Mättig,D. Notz,R. J. Nowak,J. Pyrlik,D. R. Quarrie,M. Rushton,W. Schütte,D. Trines,Gy. Wolf,Ch. Xiao,R. Fohrmann,E. Hilger,T. Kracht,Hl Krasemann,P. Leu,E. Lohrmann,D. Pandoulas,G. Poelz,K. U. Pösnecker,B. H. Wiik,R. Beuselinck,D. M. Binnie,A. J. Campbell,P. J. Dornan,B. Foster,D. A. Garbutt,C. Jenkins,T. D. Jones,W. G. Jones,J. McCardle,J. K. Sedgbeer,J. Thomas,W. A. T. Wan Abdullah,K. W. Bell,M. G. Bowler,Philip Bull,R. J. Cashmore,Peter Clarke,R.C.E. Devenish,P. Grossmann,C. M. Hawkes,S. L. Lloyd,Gl Salmon,T. R. Wyatt,C. Youngman,G. E. Forden,John Hart,J. Harvey,D. K. Hasell,J. Proudfoot,D. H. Saxon,P. L. Woodworth,Fernando Barreiro,Michael Dittmar,M. Holder,B. Neumann,Ehud Duchovni,U. Karshon,Giora Mikenberg,R. Mir,D. Revel,E.E. Ronat,A. Shapira,G. Yekutieli,G. Baranko,T. Barklow,A. Caldwell,M. Cherney,Joseph Izen,M. Mermikides,G. Rudolph,D. Strom,H. Venkataramania,E. Wicklund,Sau Lan Wu,Georg Zobernig +109 more
TL;DR: In this article, the general properties of jets produced by E+e− annihilation were studied with charged particles for c.m. energies between 12 and 43 GeV and the multiplicity distributions for the overall event as well as for each event hemisphere satisfy KNO scaling to within ∼20%.
Journal ArticleDOI
Charged hadron composition of the final-state in e+e- annihilation at high-energies
M. Althoff,R. Brandelik,W. Braunschweig,K. Gather,F. J. Kirschfink,K. Lübelsmeyer,H. U. Martyn,G. Peise,J. Rimkus,H. G. Sander,D.W. Schmitz,H. Siebke,D. Trines,W. Wallraff,H. Boerner,H. M. Fischer,H. Hartmann,E. Hilger,Walter Dr. Hillen,G. Knop,L. Köpke,Hermann Kolanoski,H. Kück,R. Wedemeyer,Norbert Wermes,M. Wollstadt,H. Burkhardt,S. J. Cooper,J. Franzke,H. Hultschig,P. Joos,W. Koch,U. Kötz,H. Kowalski,A. Ladage,B. Löhr,D. Lüke,P. Mättig,K. H. Mess,D. Notz,J. Pyrlik,D. R. Quarrie,R. Riethmüller,W. Schütte,P. Söding,Gy. Wolf,G. Yekutieli,R. Fohrmann,Hl Krasemann,P. Leu,E. Lohrmann,D. Pandoulas,G. Poelz,O. Römer,P. Schmüser,B. H. Wiik,I. Al-Agil,R. Beuselinck,D. M. Binnie,A. J. Campbell,P. J. Dornan,D. A. Garbutt,T. D. Jones,W. G. Jones,Stephen Lloyd,J. McCardle,J. K. Sedgebeer,K. W. Bell,M. G. Bowler,I. C. Brock,Rj Cashmore,R. Carnegie,P. E. L. Clarke,R.C.E. Devenish,P. Grossmann,John Illingworth,Gl Salmon,Juergen Thomas,T. R. Wyatt,C. Youngman,B. Foster,John Hart,J. Harvey,J. Proudfoot,D. H. Saxon,P. L. Woodworth,D. Heyland,M. Holder,Ehud Duchovni,Y. Eisenberg,U. Karshon,Giora Mikenberg,D. Revel,E.E. Ronat,A. Shapira,T. Barklow,John Freeman,P. Lecomte,T. Meyer,G. Rudolph,H. Venkataramania,E. Wicklund,Sau Lan Wu,Georg Zobernig +103 more
TL;DR: In this paper, the production of π± and K± mesons and of protons and antiprotons ine+e− annihilation has been measured at c.m. energies of W=14, 22 and 34GeV.
Journal ArticleDOI
Measurement of the cross sections of the reactions e+e− → γγ and e+e− → γγγ at LEP
M. Z. Akwawy,Gideon Alexander,John Allison,Phillip Allport,K. J. Anderson,J. C. Armitage,G.T.J. Arnison,P. Ashton,Georges Azuelos,John Baines,Austin Ball,J. Banks,Gareth J. Barker,R. J. Barlow,Jacqueline Batley,G. Beaudoin,A. Beck,J. Becker,T. Behnke,K. W. Bell,Gideon Bella,S. Bethke,Otmar Biebel,U. Binder,I. J. Bloodworth,P. Bock,Horst Breuker,R. M. Brown,Rene Brun,A. Buijs,H. J. Burckhart,Paolo Capiluppi,R. K. Carnegie,A. A. Carter,J. R. Carter,C. Y. Chang,D. G. Charlton,J. T.M. Chrin,P. E.L. Clarke,I. Cohen,W. J. Collins,J. E. Conboy,M. Couch,M. Coupland,M. Cuffiani,S. Dado,G. M. Dallavalle,S. De Jong,P. Debu,M. M. Deninno,A. Dieckmann,M. Dittmar,M. S. Dixit,E. Duchovni,I. P. Duerdoth,D. J.P. Dumas,P. A. Elcombe,P. G. Estabrooks,E. Etzion,Fabrizio Fabbri,P. Farthouat,H. M. Fischer,D. G. Fong,M. T. French,C. Fukunaga,A. Gaidot,O. Ganel,J. W. Gary,J. Gascon,N. I. Geddes,C. N. P. Gee,C. Geich-Gimbel,S. W. Gensler,F. X. Gentit,G. Giacomelli,V. Gibson,W. R. Gibson,J. D. Gillies,J. Goldberg,M. J. Goodrick,W. Gorn,D. Granite,E. Gross,J. Grunhaus,H. Hagedorn,J. Hagemann,M. Hansroul,C. K. Hargrove,I. Harrus,J. Hart,P. M. Hattersley,M. Hauschild,C. M. Hawkes,E. Heflin,R. J. Hemingway,R. D. Heuer,John Hill,S. J. Hillier,D. A. Hinshaw,C. Ho,John Hobbs,Peter R Hobson,D. Hochman,B. Holl,Rj Homer,S. R. Hou,C. P. Howarth,R. E. Hughes-Jones,R. Humbert,P. Igo-Kemenes,H. Ihssen,D. C. Imrie,L. Janissen,A. Jawahery,P. W. Jeffreys,H. Jeremie,M. Jimack,M. Jobes,R. W. L. Jones,P. Jovanovic,D. Karlen,K. Kawagoe,T. Kawamoto,R. G. Kellogg,B. W. Kennedy,C. Kleinwort,D. E. Klem,G. Knop,T. Kobayashi,T. P. Kokott,L. Köpke,R. Kowalewski,H. Kreutzmann,J. Kroll,M. Kuwano,P. Kyberd,George Lafferty,F. Lamarche,W. J. Larson,J. G. Layter,P. Le Du,P. Leblanc,A. M. Lee,M. H. Lehto,D. Lellouch,P. Lennert,C. Leroy,L. Lessard,S. Levegrün,L. Levinson,S. L. Lloyd,F. K. Loebinger,J. M. Lorah,B. Lorazo,M. J. Losty,J. Ludwig,J. Ma,A. A. Macbeth,Marcello Mannelli,Stefano Marcellini,G. Maringer,A. J. Martin,J. P. Martin,T. Mashimo,P. Mättig,U. Maur,T. J. McMahon,J. R. McNutt,Frans Meijers,D. Menszner,F. S. Merritt,H. Mes,A. Michelini,R. P. Middleton,G. Mikenberg,J. Mildenberger,D. J. Miller,C. Milstene,M. Minowa,W. Mohr,C. Moisan,Alessandro Montanari,T. Mori,M. W. Moss,P. G. Murphy,W. J. Murray,B. Nellen,Harold Nguyen,M. Nozaki,A. J.P. O'Dowd,S. W. O'Neale,B. P. O'Neill,F. G. Oakham,F. Odorici,M. Ogg,H. Oh,M. J. Oreglia,S. Orito,J. P. Pansart,G. N. Patrick,S. J. Pawley,P. Pfister,J. E. Pilcher,J. L. Pinfold,D. E. Plane,B. Poli,A. Pouladdej,E.J. Prebys,T. W. Pritchard,H. Przysiezniak,Gunter Quast,M. W. Redmond,D. L. Rees,M. Regimbald,K. Riles,C. M. Roach,S. A. Robins,A. Rollnik,J. M. Roney,S. Rossberg,A. M. Rossi,P. Routenburg,K. Runge,O. Runolfsson,S. Sanghera,R. A. Sansum,Misao Sasaki,Misao Sasaki,B. J. Saunders,A. D. Schaile,O. Schaile,W. Schappert,P. Scharff-Hansen,S. Schreiber,J. Schwarz,A. Shapira,B. C. Shen,P. Sherwood,A. Simon,P. Singh,G. P. Siroli,Andris Skuja,A. M. Smith,T. J. Smith,G. A. Snow,R. W. Springer,M. Sproston,K. Stephens,H. E. Stier,R. Stroehmer,D. Strom,H. Takeda,Tohru Takeshita,P. Taras,N. J. Thackray,T. Tsukamoto,M. F. Turner,G. Tysarczyk-Niemeyer,D. Van den plas,R. Van Kooten,G. J. VanDalen,G. Vasseur,C. J. Virtue,H. von der Schmitt,J. von Krogh,A. Wagner,C. Wahl,J. P. Walker,C. P. Ward,D. R. Ward,P. M. Watkins,A. T. Watson,N. K. Watson,Marc Weber,S. Weisz,P. S. Wells,Norbert Wermes,M. Weymann,G. W. Wilson,John Wilson,I. Wingerter,V. H. Winterer,N. C. Wood,S. Wotton,T. R. Wyatt,R. Yaari,Y. Yang,G. Yekutieli,T. Yoshida,Wolfram Dietrich Zeuner,G. T. Zorn +290 more
TL;DR: The cross section of the pure QED process e + e − → γγ has been measured using data accumulated during the 1989 and 1990 scans of the Z 0 resonance at LEP as discussed by the authors.
Journal ArticleDOI
A measurement of σtot(e+e− → hadrons) for cm energies between 12.0 and 36.7 GeV
R. Brandelik,W. Braunschweig,K. Gather,F. J. Kirschfink,K. Lübelsmeyer,H. U. Martyn,G. Peise,J. Rimkus,H. G. Sander,D.W. Schmitz,D. Trines,W. Wallraff,H. Boerner,H. M. Fischer,H. Hartmann,E. Hilger,Walter Dr. Hillen,G. Knop,L. Köpke,Hermann Kolanoski,B. Löhr,R. Wedemeyer,Norbert Wermes,M. Wollstadt,H. Burkhardt,S. Cooper,J. Franzke,D. Heyland,H. Hultschig,P. Joos,W. Koch,U. Kötz,H. Kowalski,A. Ladage,D. Lüke,H. L. Lynch,P. Mättig,K. H. Mess,D. Notz,J. Pyrlik,D. R. Quarrie,R. Riethmüller,W. Schütte,P. Söding,Gy. Wolf,R. Fohrmann,Hl Krasemann,P. Leu,D. Pandoulas,G. Poelz,O. Römer,P. Schmüser,B. H. Wiik,I. Al-Agil,R. Beuselinck,D. M. Binnie,A. J. Campbell,P. J. Dornan,D. A. Garbutt,T. D. Jones,W. G. Jones,Sl Lloyd,J. Sedgbeer,RA Stern,S Yarker,K. W. Bell,M. G. Bowler,I. C. Brock,Rj Cashmore,R. Carnegie,R.C.E. Devenish,P. Grossmann,John Illingworth,M. Ogg,Gl Salmon,Juergen Thomas,T. R. Wyatt,C. Youngman,B. Foster,J. C. Hart,J. Harvey,J. Proudfoot,D. H. Saxon,P. L. Woodworth,M. Holder,Ehud Duchovni,Y. Eisenberg,U. Karshon,Giora Mikenberg,D. Revel,E.E. Ronat,A. Shapira,T. Barklow,John Freeman,T. Meyer,G. Rudolph,E. Wicklund,Sau Lan Wu,Georg Zobernig +98 more
TL;DR: The ration R = σ (e + e − → hadrons) σ μμ was measured between 12.0 and 36.7 GeV c.m. energy with a precision of typically ± 5.2% as discussed by the authors.
Journal ArticleDOI
D∗± production by e+e− annihilation near 34.4 GeV cm energy
M. Althoff,W. Braunschweig,K. Gather,F. J. Kirschfink,K. Lübelsmeyer,H. U. Martyn,G. Peise,J. Rimkus,H. G. Sander,D.W. Schmitz,H. Siebke,D. Trines,W. Wallraff,H. M. Fischer,H. Hartmann,E. Hilger,Walter Dr. Hillen,G. Knop,L. Köpke,Hermann Kolanoski,H. Kück,R. Wedemeyer,Norbert Wermes,M. Wollstadt,H. Burkhardt,H. Hultschig,P. Joos,W. Koch,U. Kötz,H. Kowalski,A. Ladage,B. Löhr,D. Lüke,P. Mättig,K. H. Mess,D. Notz,J. Pyrlik,D. R. Quarrie,R. Riethmüller,A. M. Rushton,W. Schütte,Gy. Wolf,G. Yekutieli,R. Fohrmann,Hl Krasemann,P. Leu,E. Lohrmann,D. Pandoulas,G. Poelz,B. H. Wiik,I. Al-Agil,R. Beuselinck,D. M. Binnie,A. J. Campbell,P. J. Dornan,B. Foster,D. A. Garbutt,T. D. Jones,W. G. Jones,J. McCardle,J. K. Sedgbeer,K. W. Bell,M. G. Bowler,I. C. Brock,R. J. Cashmore,P. E. L. Clarke,R.C.E. Devenish,P. Grossmann,Stephen Lloyd,Gl Salmon,Juergen Thomas,T. R. Wyatt,C. Youngman,John Hart,J. Harvey,J. Proudfoot,D. H. Saxon,P. L. Woodworth,D. Heyland,M. Holder,M. Dittmar,Ehud Duchovni,Y. Eisenberg,D. Hochman,U. Karshon,G. Mikenberg,R. Mir,D. Revel,E.E. Ronat,A. Shapira,T. Barklow,M. Cherney,Joseph Izen,G. Rudolph,D. Strom,H. Venkataramania,E. Wicklund,Lan Wu Sau Lan Wu,Georg Zobernig +98 more
TL;DR: The D∗± energy spectrum is hard, with a maximum near χ = 0.6. as discussed by the authors showed that a large fraction of charm quark production yields D ∗ mesons, which is consistent with that expected in the standard theory for weak neutral currents.