J. Irion
Harvard University
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Featured researches published by J. Irion.
European Physical Journal C | 1989
K. Wachs; D. Antreasyan; H. W. Bartels; Ch. Bieler; J. K. Bienlein; A. Bizzeti; E. D. Bloom; K. Brockmüller; A.M. Cartacci; M. Cavalli-Sforza; R. Clare; A. Compagnucci; G. Conforto; S. Cooper; D. Coyne; G. Drews; K. Fairfield; G. Folger; A. Fridman; D. Gelphman; G. Glaser; G. Godfrey; K. Graaf; F. H. Heimlich; F.-H. Heinsius; R. Hofstadter; J. Irion; Z. Jakubowski; K. Karch; S. Keh
The Crystal Ball Collaboration has measured the energy spectrum of electrons from semileptonicB meson decays at thee+e− storage ring DORIS II. Branching ratios and weak mixing angles of the Kobayashi-Maskawa matrix are determined using several models for the hadronic matrix elements. We obtain the branching ratio for semileptonic.B decays to charmed states BR(B→evXc)=(11.7±0.4±1.0)%. Our result for the corresponding Kobayashi-Maskawa matrix element is |Vcb|=0.052±0.006. The model dependence of both results is included in the error. We have not observed semileptonicB decays to non-charmed mesons. Analyzing the measured electron spectrum above 2.4 GeV, where nob→c decays contribute, we find BR(B→evXu)/BR(B→evXc)<6.5% at the 90% confidence level. This corresponds to an upper limit |Vub/Vcb|<0.21.
European Physical Journal C | 1988
Z. Jakubowski; D. Antreasyan; H. W. Bartels; D. Besset; Ch. Bieler; J. K. Bienlein; A. Bizzeti; E. D. Bloom; I. Brock; K. Brockmüller; R. Cabenda; A.M. Cartacci; M. Cavalli-Sforza; R. Clare; A. Compagnucci; G. Conforto; R. Cowan; D. Coyne; G. Drews; A. Engler; K. Fairfield; G. Folger; A. Fridman; J. Gaiser; D. Gelphman; G. Glaser; G. Godfrey; K. Graaf; F. H. Heimlich; F. H. Heinsius
AbstractUsing the Crystal Ball detector operating at the DORIS II storage ring we have measured the leptonic partial widthsГee of the Υ(1S) and Υ(2S) resonances. We find
European Physical Journal A | 1988
Z. Jakubowski; C. Peck; H. Marsiske; A. Engler; A. C. König; F. H. Heimlich; P. Zschorsch; G. Drews; U. Strohbusch; D. Sievers; R.W. Kraemer; K. Wachs; C. Pegel; H. Kilian; R.T. Van de Walle; T. Kiel; B. Niczyporuk; J. Tompkins; B. van Uitert; K. Fairfield; R. Cowan; H. W. Bartels; F. Messing; G. Glaser; F. C. Porter; G. Conforto; P. Schmitt; S. Lowe; Daniel Marlow; K. Graaf
European Physical Journal C | 1988
P. Schmitt; D. Antreasyan; H. W. Bartels; D. Besset; Ch. Bieler; J. K. Bienlein; A. Bizzeti; E. D. Bloom; I. Brock; K. Brockmüller; R. Cabenda; A.M. Cartacci; M. Cavalli-Sforza; R. Clare; A. Compagnucci; G. Conforto; S. Cooper; R. Cowan; D. Coyne; A. Engler; K. Fairfield; G. Folger; A. Fridman; J. Gaiser; D. Gelphman; G. Glaser; G. Godfrey; F. H. Heimlich; R. Hofstadter; J. Irion
\Gamma _{ee} (\Upsilon (1S)) = 1.34 \pm 0.03 \pm 0.06keV
European Physical Journal C | 1990
D. Antreasyan; H. W. Bartels; Ch. Bieler; J. K. Bienlein; A. Bizzeti; E. D. Bloom; K. Brockmüller; A.M. Cartacci; M. Cavalli-Sforza; R. Clare; A. Compagnucci; G. Conforto; S. Cooper; D. Coyne; K. Fairfield; G. Folger; A. Fridman; D. Gelphman; G. Glaser; G. Godfrey; K. Graaf; F. H. Heimlich; F.-H. Heinsius; R. Hofstadter; J. Irion; Z. Jakubowski; H. Janssen; K. Karch; S. Keh; T. Kiel
European Physical Journal C | 1990
W. Maschmann; D. Antreasyan; H. W. Bartels; D. Besset; Ch. Bieler; J. K. Bienlein; A. Bizzeti; E. D. Bloom; I. Brock; K. Brockmüller; R. Cabenda; A.M. Cartacci; M. Cavalli-Sforza; R. Clare; A. Compagnucci; G. Conforto; S. Cooper; R. Cowan; D. Coyne; A. Engler; K. Fairfield; G. Folger; A. Fridman; J. Gaiser; D. Gelphman; G. Glaser; G. Godfrey; K. Graaf; F. H. Heimlich; F.-H. Heinsius
and
European Physical Journal C | 1990
D. Antreasyan; H. W. Bartels; D. Besset; Ch. Bieler; J. K. Bienlein; Andrea Bizzeti; E. D. Bloom; I. Brock; K. Brockmüller; R. Cabenda; A.M. Cartacci; M. Cavalli-Sforza; R. Clare; A. Compagnucci; G. Conforto; S. Cooper; R. Cowan; D. Coyne; A. Engler; K. Fairfield; G. Folger; A. Fridman; J. Gaiser; D. Gelphman; G. Glaser; G. Godfrey; K. Graaf; F. H. Heimlich; F.-H. Heinsius; R. Hofstadter
European Physical Journal C | 1992
M. Kobel; D. Antreasyan; H. W. Bartels; D. Besset; Ch. Bieler; J. K. Bienlein; A. Bizetti; E. D. Bloom; I. Brock; K. Brockmüller; R. Cabenda; A.M. Cartacci; M. Cavalli-Sforza; R. Clare; A. Compagnucci; G. Conforto; S. Cooper; R. Cowan; D. Coyne; A. Engler; K. Fairfield; G. Folger; A. Fridman; J. Gaiser; D. Gelphman; G. Glaser; G. Godfrey; K. Graaf; F. H. Heimlich; F.-H. Heinsius
\Gamma _{ee} (\Upsilon (2S)) = 0.56 \pm 0.04 \pm 0.02keV.
European Physical Journal C | 1992
T. Lesiak; D. Antreasvan; H. W. Bartels; D. Besset; Ch. Bieler; J. K. Bienlein; A. Bizzeti; E. D. Bloom; I. Brock; K. Brockmüller; R. Cabenda; A.M. Cartacci; M. Cavalli-Sforza; R. Clare; A. Compagnucci; G. Conforto; S. Cooper; R. Cowan; D. Coyne; A. Engler; K. Fairfield; G. Folger; A. Fridman; J. Gaiser; D. Gelphman; G. Glaser; G. Godfrey; K. Graaf; F. H. Heimlich; F.-H. Heinsius
European Physical Journal C | 1990
D. Antreasyan; H. W. Bartels; D. Besset; Ch. Bieler; J. K. Bienlein; A. Bizzeti; E. D. Bloom; I. Brock; K. Brockmüller; R. Cabenda; A.M. Cartacci; M. Cavalli-Sforza; R. Clare; A. Compagnucci; G. Conforto; S. Cooper; R. Cowan; D. Coyne; A. Engler; K. Fairfield; G. Folger; A. Fridman; J. Gaiser; D. Gelphman; G. Glaser; G. Godfrey; K. Graaf; F. H. Heimlich; F.-H. Heinsius; R. Hofstadter
The effect onГee of applying different prescriptions for radiative corrections is discussed. We also measureR, the ratio of non-resonant hadronic cross section to the Born cross section of μ pair production, at c.m. energyW=9.39 GeV to beR=3.48±0.04±0.16.
