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Dive into the research topics where C.K. Bowdery is active.

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Featured researches published by C.K. Bowdery.


Physics Letters B | 1984

A measurement of the electroweak induced charge asymmetry in e+e−→bb̄☆

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 A | 1990

Measurement of resonance production in the reactionsγγ →π0π0 andγγ →π0η

T. Oest; J.E. Olsson; J. Allison; K. Ambrus; R. J. Barlow; W. Bartel; S. Bethke; C.K. Bowdery; S. L. Cartwright; J. Chrin; D. Clarke; A. Dieckmann; I. P. Duerdoth; G. Eckerlin; E. Elsen; R. Felst; A.J. Finch; F. Foster; T. Greenshaw; J. Hagemann; D. Haidt; J. Heintze; G. Heinzelmann; K. H. Hellenbrand; P. Hill; G. Hughes; H. Kado; K. Kawagoe; C. Kleinwort; G. Knies

AbstractResonance production in the γγ reactionse+e−→e+e+e−π0π0 ande+e−π0η has been studied with the JADE detector at PETRA. The decay widths into γγ of thef2(1270),a0(980) anda2(1320) were measured to be


Physics Letters B | 1983

PRECISE MEASUREMENT OF TOTAL CROSS SECTIONS FOR THE PROCESS e+e - ~ MULTIHADRONS IN THE CM ENERGY RANGE BETWEEN 12.0 AND 36.4 GeV

W. Bartel; L. Becker; C.K. Bowdery; D. Cords; R. Eichler; R. Felst; D. Haidt; H. Krehbiel; B. Naroska; J.E. Olsson; P. Steffen; P. Warming; G. Dietrich; E. Elsen; G. Heinzelmann; H. Kado; K. Meier; A. Petersen; U. Schneekloth; G. Weber; S. Bethke; A. Dieckmann; J. Heintze; K. H. Hellenbrand; R.D. Heuer; S. Komamiya; J. von Krogh; P. Lennert; H. Matsumura; H. Rieseberg


Physics Letters B | 2002

Search for scalar quarks in

A. Heister; E. V. Bouhova-Thacker; C.K. Bowdery; A.J. Finch; Frank Foster; Gareth Hughes; Roger Jones; M. Smizanska

\Gamma _{\gamma \gamma } (f_2 (1270)) = 3.19 \pm 0.09_{ - 0.38}^{ + 0.22}


European Physical Journal C | 1983

e^+ e^-

W. Bartel; B. Naroska; F. Foster; C. Yanagisawa; John Allison; G. Heinzelmann; S. Odaka; Yosuke Watanabe; G. Bamford; P. Lennert; I. Glendinning; S. Bethke; K. Stephens; K. H. Hellenbrand; J. Kanzaki; R. Marshall; M. Minowa; G. Weber; T. Kobayashi; Roger Barlow; Hiroshi Takeda; P. Steffen; F. K. Loebinger; C. Bawbery; J. Heintze; G. Hughes; Tadao Nozaki; H. Kado; Mitsuaki Nozaki; C.K. Bowdery


European Physical Journal C | 1984

collisions at

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

Kev,Γλλ(a0(980))=0.28±0.04±0.10 KeV/BR(a0(980)→π0η) andΓλλ(a2(1320))=1.01±0.14±0.22KeV. For thef0(975) andf4(2050) upper limits of the widths were obtained,Γλλ(f0(975))<0.6 KeV, andΓλλ(f4(2050))<1.1 KeV, both at the 95% C.L. Assuming that the spin 0 background under thef2(1270) is small, thef2(1270) was found to be produced exclusively in a helicity 2 state. The helicity 0 contribution is <15% at the 95% C.L. The cross section forλλ→π0π0 in the mass range 2.0–3.5 GeV/c2 was measured for the first time. Since the cross section forλλ→π+π− is a factor ∼2 larger, ππ production in this range can be interpreted as taking place via isospin 0 production.


European Physical Journal C | 1983

s

W. Bartel; L. Becker; C.K. Bowdery; D. Cords; R. Eichler; R. Felst; D. Haidt; H. Krehbiel; B. Naroska; J.E. Olsson; P. Steffen; P. Warming; G. Dietrich; E. Elsen; G. Heinzelmann; H. Kado; K. Meier; A. Petersen; U. Schneekloth; G. Weber; S. Bethke; A. Dieckmann; J. Heintze; K. H. Hellenbrand; R.D. Heuer; S. Komamiya; J. von Krogh; P. Lennert; H. Matsumura; H. Rieseberg

The total cross section for the process e+e− → hadrons has been measured in the CM energy range between 12.0 and 36.4 GeV using the JADE detector with a typical systematic error of ±3%. The ratio is found to be constant over this range with an average value of 3.97 ± 0.05 (statistical and point-to-point systematic error) ± 0.10 (normalization error). The data were compared with the standard electro-weak interaction model including QCD corrections.


Physics Letters B | 1984

up to 209-GeV

W. Bartel; B. Naroska; F. Foster; J. Allison; G. Heinzelmann; S. Odaka; J. Bains; P. Lennert; I. Glendinning; S. Bethke; K. Stephens; K. H. Hellenbrand; J. Kanzaki; R. Marshall; M. Minowa; T. Kawamoto; G. Weber; J. Spitzer; T. Kobayashi; Roger Barlow; H. Takeda; P. Steffen; F. K. Loebinger; T. Takeshita; J. Heintze; G. Hughes; J. Chrin; A. Bell; H. Kado; M. Nozaki

Searches for scalar top, scalar bottom and mass-degenerate scalar quarks are performed in the data collected by the ALEPH detector at LEP, at centre-of-mass energies up to 209 GeV, corresponding to an integrated luminosity of 675 pb−1. No evidence for the production of such particles is found in the decay channels , , , or in the stop four-body decay channel studied for the first time at LEP. The results of these searches yield improved mass lower limits. In particular, an absolute lower limit of 63 GeV/c2 is obtained for the stop mass, at 95% confidence level, irrespective of the stop lifetime and decay branching ratios.


European Physical Journal C | 1983

Charged Particle and Neutral Kaon Production in e+ e- Annihilation at PETRA

W. Bartel; L. Becker; C.K. Bowdery; D. Cords; R. Eichler; R. Felst; D. Haidt; H. Krehbiel; B. Naroska; J.E. Olsson; P. Steffen; P. Warming; G. Dietrich; E. Elsen; G. Heinzelmann; H. Kado; K. Meier; A. Petersen; U. Schneekloth; G. Weber; S. Bethke; A. Dieckmann; J. Heintze; K. H. Hellenbrand; R.D. Heuer; S. Komamiya; J. von Krogh; P. Lennert; H. Matsumura; H. Rieseberg

The mean charged multiplicity as well as its distribution has been measured as a function of c.m. energy in the reactione+e−→hadrons. Fragmentation models are compared with the data. After applying radiative corrections the mean charged multiplicity is measured to be 8.4±0.3±0.6 at 12 GeV, 13.1±0.3±0.6 at 30 GeV and 13.6±0.3±0.6 at 35 GeV. The ratio of mean charged multiplicity to the dispersion (/Dch) is almost constant in the energy range studied, indicating KNO scaling of the charged multiplicity. The inclusive differential cross sections(dσ/dxp) shows scaling violation in the highxp region (xp>0.15). The absolute value of the scaling violation is consistent with the result of 2nd order QCD calculations. The production of neutral kaons has been investigated by identifying the decayKS0→π+π−. The production probability for a strange quark relative to that of au ord quark in the fragmentation, γs, has been determined to be 0.27±0.03±0.05 averaged over c.m. energies from 12 to 35 GeV. Momentum spectra for neutral kaons are presented and are compared with model predictions.


European Physical Journal C | 1987

Measurements of energy correlations ine+e−→hadrons

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; P. Steffen; T. Greenshaw; J. Hagemann; G. Heinzelmann; H. Kado; C. Kleinwort; M. Kuhlen; A. Petersen; R. Ramcke; U. Schneekloth; G. Weber; K. Ambrus; S. Bethke; A. Dieckmann; E. Elsen; J. Heintze; K. H. Hellenbrand; S. Komamiya

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.

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S. Bethke

Technische Hochschule

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H. Kado

University of Hamburg

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K. Ambrus

Heidelberg University

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G. Weber

University of Hamburg

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J.E. Olsson

University of Buenos Aires

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