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Featured researches published by E. Pietarinen.
Physics Letters B | 1984
W. Bartel; L. Becker; C.K. Bowdery; D. Cords; R. Felst; D. Haidt; H. Junge; G. Knies; H. Krehbiel; P. Laurikainen; R. Meinke; B. Naroska; J.E. Olsson; E. Pietarinen; D. Schmidt; P. Steffen; M. Zachara; G. Dietrich; E. Elsen; G. Heinzelmann; H. Kado; M. Kuhlen; T. Mashimo; K. Meier; A. Petersen; U. Schneekloth; G. Weber; K. Ambrus; S. Bethke; A. Dieckmann
Abstract The forward-backward charge asymmetry for the process e + e − → b b → μ ± + hadrons has been measured using the JADE detector at PETRA. An asymmetry of (−22.8 ± 6.0 ± 2.5)% was observed at an average center of mass energy of 34.6 GeV. For comparison, an asymmetry of −25.2% is expected on the basis of the standard Glashow-Salam-Weinberg model.
European Physical Journal C | 1984
W. Bartel; L. Becker; C.K. Bowdery; D. Cords; R. Felst; D. Haidt; H. Junge; G. Knies; H. Krehbiel; P. Laurikainen; R. Meinke; K. Meissner; B. Naroska; J.E. Olsson; E. Pietarinen; D. Schmidt; P. Steffen; P. Warming; M. Zachara; G. Dietrich; E. Elsen; G. Heinzelmann; H. Kado; M. Kuhlen; T. Mashimo; K. Meier; A. Petersen; U. Schneekloth; G. Weber; K. Ambrus
Energy-energy-correlations (EEC) have been measured with the JADE detector at c.m. energies of 14 GeV, 22 GeV and in the region 29 GeV<Ecm<36 GeV. Corrected results are presented of EEC and their asymmetry, which can be directly compared to theoretical predictions. At 〈Ecm〉=34 GeV a comparison with second order QCD predictions yields good agreement for the string model fragmentation resulting in a value of the strong coupling constant αs=0.165±0.01 (stat.). The independent fragmentation models, which yield values of αs between 0.10 and 0.15 depending on the treatment of energy and momentum conservation and of the gluon splitting, do not provide a satisfactory description of the data over the full angular range.
Physics Letters B | 1984
W. Bartel; L. Becker; C.K. Bowdery; D. Cords; R. Felst; D. Haidt; J. Huttunen; H. Junge; G. Knies; H. Krehbiel; P. Laurikainen; R. Meinke; B. Naroska; J. Olsson; E. Pietarinen; D. Schmidt; P. Steffen; P. Warming; M. Zachara; G. Dietrich; E. Elsen; G. Heinzelmann; H. Kado; K. Meier; A. Petersen; U. Schneekloth; G. Weber; K. Ambrus; S. Bethke; A. Dieckmann
Abstract We have searched for the supersymmetric partner of the photon, the photino, by investigating two-photon and single photon final states in e+e− collisions. No significant signals were observed, which excludes the existence of the photino in the mass range 0.08–18 GeV/c2 at the 95% confidence level, subject to the assumptions d=(100 GeV)2 and m e =40 GeV /c 2 , where d is the supersymmetry breaking scale parameter and m e is the scalar electron mass.
European Physical Journal C | 1985
W. Bartel; L. Becker; C.K. Bowdery; C. Cords; R. Felst; D. Haidt; H. Junge; G. Knies; H. Krehbiel; P. Laurikainen; R. Meinke; B. Naroska; J.E. Olsson; E. Pietarinen; D. Schmidt; P. Steffen; G. Dietrich; G. Heinzelmann; H. Kado; M. Kuhlen; T. Mashimo; K. Meier; A. Petersen; U. Schneekloth; G. Weber; K. Ambrus; S. Bethke; A. Dieckmann; J. Heintze; K. H. Hellenbrand
AbstractThe production of collinear muon pairs has been studied using the JADE detector at thee+e− storage ring at PETRA. Results for the total cross section and the angular distribution were obtained at centre of mass (cm) energies ranging from 12 to 46 GeV. The data correspond to an integrated luminosity offLdt>90 pb−1, of which 71.2 pb−1 were taken atn
Physics Letters B | 1984
W. Bartel; L. Becker; C.K. Bowdery; D. Cords; R. Felst; D. Haidt; H. Junge; G. Knies; H. Krehbiel; P. Laurikainen; R. Meinke; B. Naroska; J. Olsson; E. Pietarinen; D. Schmidt; P. Steffen; P. Warming; M. Zachara; G. Dietrich; E. Elsen; G. Heinzelmann; H. Kado; M. Kuhlen; T. Mashimo; K. Meier; A. Petersen; U. Schneekloth; G. Weber; K. Ambrus; S. Bethke
Physics Letters B | 1984
W. Bartel; L. Becker; C.K. Bowdery; D. Cords; R. Felst; D. Haidt; H. Junge; G. Knies; H. Krehbiel; P. Laurikainen; R. Meinke; B. Naroska; J.E. Olsson; E. Pietarinen; D. Schmidt; P. Steffen; M. Zachara; G. Dietrich; E. Elsen; G. Heinzelmann; H. Kado; M. Kuhlen; T. Mashimo; K. Meier; A. Petersen; U. Schneekloth; G. Weber; K. Ambrus; S. Bethke; A. Dieckmann
leftlangle {sqrt s } rightrangle
Physics Letters B | 1984
W. Bartel; L. Becker; C.K. Bowdery; D. Cords; R. Felst; D. Haidt; H. Junge; G. Knies; H. Krehbiel; P. Laurikainen; R. Meinke; B. Naroska; J.E. Olsson; E. Pietarinen; D. Schmidt; P. Steffen; M. Zachara; G. Dietrich; E. Elsen; G. Heinzelmann; H. Kado; M. Kuhlen; T. Mashimo; K. Meier; A. Petersen; U. Schneekloth; G. Weber; K. Ambrus; S. Bethke; A. Dieckmann
European Physical Journal C | 1984
W. Bartel; L. Becker; C.K. Bowdery; D. Cords; R. Felst; D. Haidt; H. Junge; G. Knies; H. Krehbiel; P. Laurikainen; R. Meinke; B. Naroska; J.E. Olsson; E. Pietarinen; D. Schmidt; P. Steffen; P. Warming; M. Zachara; G. Dietrich; E. Elsen; G. Heinzelmann; H. Kado; K. Meier; A. Petersen; U. Schneekloth; G. Weber; K. Ambrus; S. Bethke; A. Dieckmann; J. Heintze
n=34.4 GeV and 17 pb−1 atn
Physics Letters B | 1984
W. Bartel; L. Becker; C.K. Bowdery; D. Cords; R. Felst; D. Haidt; H. Junge; G. Knies; H. Krehbiel; P. Laurikainen; R. Meinke; B. Naroska; J.E. Olsson; E. Pietarinen; D. Schmidt; P. Steffen; M. Zachara; G. Dietrich; E. Elsen; G. Heinzelmann; H. Kado; M. Kuhlen; T. Mashimo; K. Meier; A. Petersen; U. Schneekloth; G. Weber; K. Ambrus; S. Bethke; A. Dieckmann
Physics Letters B | 1984
W. Bartel; H. Matsumura; B. Naroska; F. Foster; John Allison; G. Heinzelmann; F. K. Loebinger; R.G. Glasser; J. Bains; P. Lennert; S. R. Wagner; B. Sechi-Zorn; S. Bethke; R. P. Middleton; S. L. Cartwright; K. Stephens; K. H. Hellenbrand; J. Kanzaki; R. Marshall; H. E. Mills; M. Minowa; T. Mashimo; J. M. Nye; G. Weber; J. Spitzer; T. Kobayashi; A. Petersen; Roger Barlow; H. Takeda; P. Steffen
leftlangle {sqrt s } rightrangle
