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  • 1980-1984  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    A new quantity for finding four-jet events in electron-positron annihilation into hadrons (1982)
    Springer
    The European physical journal 14 (1982), S. 47-53 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We introduce a new jet measure, tripodityD 3, which offers good prospects to identify four-jet events ine + e − annihilation into hadrons. TheoreticalD 3 distributions are presented for quantum chromodynamics, for an abelian model and for a phase space distribution of four jets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01547963
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The vacuum structure in QCD and hadron-hadron scattering (1984)
    Springer
    The European physical journal 24 (1984), S. 283-296 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Standard ideas on the structure of the vacuum in QCD suggest it to be full of fluctuating color fields. We investigate the possible influence of the chromomagnetic vacuum fields on high energy hadron-hadron reactions. We suggest that high energy quarks traversing these fields will produce soft gluon and photon radiation analogous to synchrotron radiation from electrons and positrons in a storage ring. We argue that this radiation will lead to polarization phenomena for quarks in spin- and colorspace which in turn can explain theK-factor in the Drell-Yan reaction. We point out that jet production offers another way to study these polarization phenomena. We present then a calculation of the number of “synchrotron” photons which should be emitted inp−p collisions at high energies. Thus, we predict a sizable signal of prompt photons of nnergy less than a few hundred MeV with a characteristic frequency distribution. Observation of such photons would give strong support to our naive picture. Finally we point out a number of other phenomena like charmed particle decays where our “synchrotron” effect may be of importance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410367
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A test for the gluon selfcoupling in the reactionse + e −→4 jets andZ 0→4 jets (1982)
    Springer
    The European physical journal 16 (1982), S. 45-54 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We consider the reactionse + e −→γ*→4 jets andZ o→4 jets with the 4 jets coming in two pairs of essentially back to back jets of high and low energy. We calculate the angular distribution of the low energy jet axis with respect to the high energy jet axis in QCD, in an abelian gluon model “QED” and a phase space model (PS). Using simple helicity arguments we show that our angular distribution is very sensitive to the triple gluon coupling in QCD. This is then confirmed by a complete calculation. Our correlation offers, therefore, a direct test for QCD as a non-abelian gauge theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01573746
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Radiative decays of quarkonia into Goldstone fermions (1984)
    Springer
    The European physical journal 23 (1984), S. 199-203 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We consider the decay of3 S 1 quarkonia into a photon and two Goldstone fermions in a model realizing supersymmetry in a nonlinear way. We derive a lower bound of 3.5 GeV for the scale of spontaneous supersymmetry breaking from Υ-decays. We show that the decay of a3 S 1 quarkonium into two Goldstone fermions is forbidden in the order we consider.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01557596
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Zur Chemie der 3-Aroylimino-3H-1,2-dithiole (1980)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 322 (1980), S. 769-784 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reactions of 3-Aroylimino-3H-1,2-dithiolesThe thiolates 3 and 10 prepared from 3-aroylimino-4-aroylthio-5-cyano-3H-1,2-dithioles 1 with bases, react with alkylhalides and acylhalides to the corresponding 4-S-substituted compounds 6, 11 and 7, respectively. Treatment of the thiolates with 1-chloropropanone gives the bicyclic compound 12 by intramolecular cyclization involving the 5-cyano-group. 3,6-Bis-(acylimino)-3H,6H-[4,3-c] [1,2]-dithioles 2 or 8 are prepared from the S-acylated dithioles 1 or 7 and sulphur in pyridine/benzene. 1,2,4-Triazines 13 are formed by the reaction of dithiol es 1 orthiolates 3 with phenylhydrazine. The thiolates give upon protonation the mesoionic dithioliumthiolates 4. Coordination compounds are obtained from the reaction of the thiolates with cations of 3d-elements. On the basis of the chemical behaviour of the new 3-acylimino-1,2-dithioles and the results of spectroscopic measurements a strong bonding interaction between the N-acyl-carbonylgroup and the dithiole ring system in these compounds is supposed.
    Additional Material: 8 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19803220511
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    Paper (German National Licenses)
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