Search Results - (Author, Cooperation:H. G. Sander)

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  1. 1
    M. G. Aartsen ; R. Abbasi ; Y. Abdou ; M. Ackermann ; J. Adams ; J. A. Aguilar ; M. Ahlers ; D. Altmann ; J. Auffenberg ; X. Bai ; M. Baker ; S. W. Barwick ; V. Baum ; R. Bay ; J. J. Beatty ; S. Bechet ; J. Becker Tjus ; K. H. Becker ; M. L. Benabderrahmane ; S. BenZvi ; P. Berghaus ; D. Berley ; E. Bernardini ; A. Bernhard ; D. Bertrand ; D. Z. Besson ; G. Binder ; D. Bindig ; M. Bissok ; E. Blaufuss ; J. Blumenthal ; D. J. Boersma ; S. Bohaichuk ; C. Bohm ; D. Bose ; S. Boser ; O. Botner ; L. Brayeur ; H. P. Bretz ; A. M. Brown ; R. Bruijn ; J. Brunner ; M. Carson ; J. Casey ; M. Casier ; D. Chirkin ; A. Christov ; B. Christy ; K. Clark ; F. Clevermann ; S. Coenders ; S. Cohen ; D. F. Cowen ; A. H. Cruz Silva ; M. Danninger ; J. Daughhetee ; J. C. Davis ; M. Day ; C. De Clercq ; S. De Ridder ; P. Desiati ; K. D. de Vries ; M. de With ; T. DeYoung ; J. C. Diaz-Velez ; M. Dunkman ; R. Eagan ; B. Eberhardt ; B. Eichmann ; J. Eisch ; R. W. Ellsworth ; S. Euler ; P. A. Evenson ; O. Fadiran ; A. R. Fazely ; A. Fedynitch ; J. Feintzeig ; T. Feusels ; K. Filimonov ; C. Finley ; T. Fischer-Wasels ; S. Flis ; A. Franckowiak ; K. Frantzen ; T. Fuchs ; T. K. Gaisser ; J. Gallagher ; L. Gerhardt ; L. Gladstone ; T. Glusenkamp ; A. Goldschmidt ; G. Golup ; J. G. Gonzalez ; J. A. Goodman ; D. Gora ; D. T. Grandmont ; D. Grant ; A. Gross ; C. Ha ; A. Haj Ismail ; P. Hallen ; A. Hallgren ; F. Halzen ; K. Hanson ; D. Heereman ; D. Heinen ; K. Helbing ; R. Hellauer ; S. Hickford ; G. C. Hill ; K. D. Hoffman ; R. Hoffmann ; A. Homeier ; K. Hoshina ; W. Huelsnitz ; P. O. Hulth ; K. Hultqvist ; S. Hussain ; A. Ishihara ; E. Jacobi ; J. Jacobsen ; K. Jagielski ; G. S. Japaridze ; K. Jero ; O. Jlelati ; B. Kaminsky ; A. Kappes ; T. Karg ; A. Karle ; J. L. Kelley ; J. Kiryluk ; J. Klas ; S. R. Klein ; J. H. Kohne ; G. Kohnen ; H. Kolanoski ; L. Kopke ; C. Kopper ; S. Kopper ; D. J. Koskinen ; M. Kowalski ; M. Krasberg ; K. Krings ; G. Kroll ; J. Kunnen ; N. Kurahashi ; T. Kuwabara ; M. Labare ; H. Landsman ; M. J. Larson ; M. Lesiak-Bzdak ; M. Leuermann ; J. Leute ; J. Lunemann ; J. Madsen ; G. Maggi ; R. Maruyama ; K. Mase ; H. S. Matis ; F. McNally ; K. Meagher ; M. Merck ; T. Meures ; S. Miarecki ; E. Middell ; N. Milke ; J. Miller ; L. Mohrmann ; T. Montaruli ; R. Morse ; R. Nahnhauer ; U. Naumann ; H. Niederhausen ; S. C. Nowicki ; D. R. Nygren ; A. Obertacke ; S. Odrowski ; A. Olivas ; A. O'Murchadha ; L. Paul ; J. A. Pepper ; C. Perez de los Heros ; C. Pfendner ; D. Pieloth ; E. Pinat ; J. Posselt ; P. B. Price ; G. T. Przybylski ; L. Radel ; M. Rameez ; K. Rawlins ; P. Redl ; R. Reimann ; E. Resconi ; W. Rhode ; M. Ribordy ; M. Richman ; B. Riedel ; J. P. Rodrigues ; C. Rott ; T. Ruhe ; B. Ruzybayev ; D. Ryckbosch ; S. M. Saba ; T. Salameh ; H. G. Sander ; M. Santander ; S. Sarkar ; K. Schatto ; F. Scheriau ; T. Schmidt ; M. Schmitz ; S. Schoenen ; S. Schoneberg ; A. Schonwald ; A. Schukraft ; L. Schulte ; O. Schulz ; D. Seckel ; Y. Sestayo ; S. Seunarine ; R. Shanidze ; C. Sheremata ; M. W. Smith ; D. Soldin ; G. M. Spiczak ; C. Spiering ; M. Stamatikos ; T. Stanev ; A. Stasik ; T. Stezelberger ; R. G. Stokstad ; A. Stossl ; E. A. Strahler ; R. Strom ; G. W. Sullivan ; H. Taavola ; I. Taboada ; A. Tamburro ; A. Tepe ; S. Ter-Antonyan ; G. Tesic ; S. Tilav ; P. A. Toale ; S. Toscano ; E. Unger ; M. Usner ; N. van Eijndhoven ; A. Van Overloop ; J. van Santen ; M. Vehring ; M. Voge ; M. Vraeghe ; C. Walck ; T. Waldenmaier ; M. Wallraff ; C. Weaver ; M. Wellons ; C. Wendt ; S. Westerhoff ; N. Whitehorn ; K. Wiebe ; C. H. Wiebusch ; D. R. Williams ; H. Wissing ; M. Wolf ; T. R. Wood ; K. Woschnagg ; D. L. Xu ; X. W. Xu ; J. P. Yanez ; G. Yodh ; S. Yoshida ; P. Zarzhitsky ; J. Ziemann ; S. Zierke ; M. Zoll
    American Association for the Advancement of Science (AAAS)
    Published 2013
    Staff View
    Publication Date:
    2013-11-23
    Publisher:
    American Association for the Advancement of Science (AAAS)
    Print ISSN:
    0036-8075
    Electronic ISSN:
    1095-9203
    Topics:
    Biology
    Chemistry and Pharmacology
    Computer Science
    Medicine
    Natural Sciences in General
    Physics
    Published by:
    http://www.aaas.org/

    Latest Papers from Table of Contents or Articles in Press
  2. 2
    Sander, H.-G.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0920-5632
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1016/0920-5632(90)90037-U

    Articles: DFG German National Licenses
  3. 3
    Koller, K. ; Sander, H. G. ; Walsh, T. F. ; Zerwas, P. M.
    Springer
    Published 1980
    Staff View
    ISSN:
    1434-6052
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract We discuss the angular asymmetries of 3-jet events ine + e − annihilation, originating from hard gluon bremsstrahlung off quarks. Lepton beam polarization helps to disentangle the various helicity components of the bremsstrahlung cross section. They are sensitive to the spin of the radiated quantum but are otherwise parameter-free.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01588839

    Articles: DFG German National Licenses
  4. 4
    Staff View
    ISSN:
    1434-6052
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract This paper summarizes the measurements one + e − annihilation performed by the DASP Collaboration in the energy range between 3.1 and 5.2 GeV. The following topics are covered: total cross section, production and two body decays of the narrow resonances, radiative decays of theJ/ψ and ψ′ resonances and evidence for theX(2.82), ψ′ cascade decays, inclusive η production and evidence for theF meson, semileptonic decays of charmed mesons and properties of the heavy lepton.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01440224

    Articles: DFG German National Licenses
  5. 5
    Staff View
    ISSN:
    1434-6052
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract We have measured charged particle pair production in two-photon scattering at thee + e − storage ring PETRA. While the main source of such events is the production of lepton pairs, the presence of an additional process is clearly indicated by the measured invariant mass distribution of the two particles and their angular distributions. We determine that the excess is mainly due to the decayf 0(1270)→π+π-. We derive a width Γ(f 0→γγ)=3.2±0.2±0.6 keV (statistical and systematic).
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01547482

    Articles: DFG German National Licenses
  6. 6
    Staff View
    ISSN:
    1434-6052
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract Measurements ofR, sphericity and thrust are presented for c.m. energies between 12 and 31.6 GeV. A possible contribution of at $$\bar t$$ continuum can be ruled out for c.m. energies between 16 and 31 GeV.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01554391

    Articles: DFG German National Licenses
  7. 7
    Staff View
    ISSN:
    0168-9002
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0168-9002(85)90272-4

    Articles: DFG German National Licenses
  8. 8
    Staff View
    ISSN:
    1434-6052
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract We present an analysis ofρ 0 ρ 0 production by two photons in theρ 0 ρ 0 invariant mass range from 1.2 to 2.0 GeV. From a study of the angular correlations in the process γγ→ρ 0 ρ 0→π−π+π− we exclude a dominant contribution fromJ P=0− or 2− states. The data indicate sizeable contributions fromJ P=0+ for four pion massesM 4π〈1.7 GeV and fromJ P=2+ forM 4π〉1.7 GeV. The data are also well described by a model with isotropic production and uncorrelated isotropic decay of theρ 0,s. The cross section stays high below the nominalρ 0 ρ 0 threshold, i.e.M 4π〈1.5 GeV. The matrix element forρ 0 ρ 0 production is found to decrease steeply with increasingM 4π. Upper limits for the couplings of the ι(1440) and Θ(1640) to γγ andρ 0 ρ 0 are given:Γ(ι→γγ)·B(ι→ρ 0 ρ 0)〈1.0 keV andΓ(Θ→γγ)
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01573742

    Articles: DFG German National Licenses
  9. 9
    Staff View
    ISSN:
    1434-6052
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract The inclusive production of π± andK ± mesons and of protons and antiprotons ine + e − annihilation has been measured at c.m. energies ofW=14, 22 and 34GeV. Using time of flight measurements and Cerenkov counters the full momentum range has been covered. Differential cross sections and total particle yields are given. At particle momenta of 0.4 GeV/c more than 90% of the charged hadrons are pions. With increasing momentum the fraction of pions among the charged hadrons decreases. AtW=34 GeV and a momentum of 5 GeV/c the particle fractions are approximately π±:K ±:p, $$\bar p = 0.55:0.3:0.15$$ . On average an event atW=34 GeV contains 10.3±0.4π±, 2.0±0.2K ± and 0.8±0.1p, $$\bar p$$ . In addition, we present results on baryon correlations using a sample of events where two or more protons and/or antiprotons are observed in the final state.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01577813

    Articles: DFG German National Licenses
  10. 10
    Staff View
    ISSN:
    1434-6052
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract The production of prompt muons ine + e − annihilation has been studied at centre of mass energies near 34.5 GeV. The measured semi-muonic branching ratios ofb andc quarks areB(b»Xμv) =0.117±0.028±0.01 andB(c→Xμv)=0.082 ±0.012 a−0.01 +0.02 . The fragmentation functions of heavy quarks are hard, 〈z b〉=0.85 a−0.12–0.07 +0.10+0.02 and 〈z c〉 =0.77 a−0.07–0.11 +0.05+0.03 . Limits have been set on flavour changing neutral current decays:B(b→Xµ + µ −) 〈0.02 andB(b→Xµ + µ − (95% confidence level).
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01575783

    Articles: DFG German National Licenses
  11. 11
    Staff View
    ISSN:
    1434-6052
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract We present an analysis of electroweak leptonic couplings from high statistics experiments on Bhabha scattering and μ pair production at an energy of 34.5 GeV. The forward-backward charge asymmetry of the μ pairs was measured to be −0.098±0.023±0.005. The data were found to agree well with the standard theory of electroweak interaction giving sin2θ W =0.27±0.07. The leptonic weak couplings were determined to beg v=0.000±0.170 andg A=−0.481±0.055. The data were also used to investigate a class of composite models for leptons.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01577559

    Articles: DFG German National Licenses
  12. 12
    Staff View
    ISSN:
    1434-6052
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract We present the general properties of jets produced bye + e − annihilation. Their production and fragmentation characteristics have been studied with charged particles for c.m. energies between 12 and 43 GeV. In this energy rangee + e − annihilation into hadrons is dominated by pair production of the five quarksu, d, s, c andb. In addition, hard gluon bremsstrahlung effects which are invisible at low energies become prominent at the high energies. The observed multiplicity distributions deviate from a Poisson distribution. The multiplicity distributions for the overall event as well as for each event hemisphere satisfy KNO scaling to within ∼20%. The distributions ofx p=2p/W are presented; scale breaking is observed at the level of 25%. The quantityx p dδ/dx p is compared with multigluon emission calculations which predict a Gaussian distribution in terms of ln(1/x). The observed energy dependence of the maximum of the distributions is in qualitative agreement with the calculations. Particle production is analysed with respect to the jet axis and longitudinal and transverse momentum spectra are presented. The angular distribution of the jet axis strongly supports the idea of predominant spin 1/2 quark pair production. The particle distributions with respect to the event plane show clearly the growing importance of planar events with increasing c.m. energies. They also exclude the presence of heavy quark production,e + e −→Q $$\bar Q$$ for quark masses up to 5〈m Q 〈20.3 GeV (|e Q |=2/3) and 7〈m Q 〈19 GeV (|e Q |=1/3). The comparison of 1/σtot dδ/dp T measured at 14, 22 and 34 GeV suggests that hard gluon bremsstrahlung contributes mainly to transverse momenta larger than 0.5 GeV/c. The rapidity distribution forW≧22 GeV shows an enhancement away fromy=0 which corresponds to an increase in yield of 10–15% compared to the centre region (y=0). The enhancement probably results from heavy quark production and gluon bremsstrahlung. The particle flux around the jet axis shows with increasing c.m. energy a rapidly growing number of particles collimated around the jet axis, while at large angles to the jet axis almost noW dependence is observed. For fixed longitudinal momentump ‖ approximate “fan invariance” is seen: The shape of the angular distribution around the jet axis is almost independent ofW. The collimation depends strongly onp ‖. For smallp ‖,p ‖〈0.2 GeV/c, isotropy is observed. With increasingp ‖ the particles tend to be emitted closer and closer to the jet axis.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01547419

    Articles: DFG German National Licenses
  13. 13
    Staff View
    ISSN:
    1434-6052
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract Multihadron events produced bye + e − annihilation at a c.m. energy of 34.6 GeV have been used to determine α s . The predictions of 1 st and 2nd order QCD models with independent jet and string fragmentation have been compared to a large variety of kinematic variables such as event shapes, transverse momentum spectra, jet masses, 3-cluster thrust and the asymmetry of energy-energy correlations. The value of α s has been found to depend on the variables used, on the fragmentation model and on the treatment of soft gluons in the 2nd order QCD calculation. Within the models considered α s has been found in complete 2nd order QCD to lie between 0.12 and 0.23.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01421751

    Articles: DFG German National Licenses
  14. 14
    Staff View
    ISSN:
    1434-6052
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract Samples of ∼1,900 identified protons and ∼500 Λ have been used to search for decuplet baryon production ine + e − annihilation at a c.m. energy of 34.4 GeV. Thep π+ and Λ π± invariant mass spectra contain no Δ orΣ* signals. Upper limits, at 95% confidence level, are that less than 12% of allp and less than 26% of all Λ come from the decay of doubly charged Δ and singly chargedΣ* states respectively. These limits correspond to production rates of 〈0.10Δ ++ and 〈0.09Σ*± per event (inclusive of anti-particles). Production of the decuplet statesΔ ++ andΣ*± is suppressed by a factor ≳9 relative to octet baryons of the same strangeness.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01421753

    Articles: DFG German National Licenses
  15. 15
    Staff View
    ISSN:
    1434-6052
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract Data from the NA31 experiment at CERN have been used to measure the branching ratio of the double Dalitz decay of the long-lived neutral kaon. Eight events have been found with negligible background. The measured distribution of the angle between the planes of the two e+e−-pairs favours aCP=−1 state for the long-lived neutral kaon.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01556126

    Articles: DFG German National Licenses