H. M. Braun
University of Wuppertal
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Featured researches published by H. M. Braun.
European Physical Journal A | 1995
M. Adams; S. Aïd; P. L. Anthony; D.A. Averill; M. D. Baker; B. R. Baller; A. Banerjee; A.A. Bhatti; U. Bratzler; H. M. Braun; H. Breidung; W. Busza; T. J. Carroll; H.L. Clark; J. M. Conrad; R. Davisson; I. Derado; S. Dhawan; F.S. Dietrich; W. Dougherty; T. Dreyer; V. Eckardt; U. Ecker; M. Erdmann; G.Y. Fang; J. Figiel; R.W. Finlay; H.J. Gebauer; D. F. Geesaman; K.A. Griffioen
Nuclear shadowing is observed in the per-nucleon cross sections of positive muons on carbon, calcium and lead as compared to deuterium. The data were taken by Fermilab experiment E665 using inelastically scattered muons of mean incident momentum 470 GeV/c. Cross-section ratios are presented in the kinematic region 0.0001<xBj<0.56 and 0.1<Q2<80 GeV2. The data are consistent with no significant ν orQ2 dependence at fixedxBj. AsxBj decreases, the size of the shadowing effect, as well as itsA dependence, are found to approach the corresponding measurements in photoproduction.
European Physical Journal C | 1995
M. Adams; M. Aderholz; S. Aïd; P. L. Anthony; M. D. Baker; J. F. Bartlett; A.A. Bhatti; H. M. Braun; W. Busza; T. J. Carroll; J. M. Conrad; G. Coutrakon; R. Davisson; I. Derado; S. Dhawan; W. Dougherty; T. Dreyer; K. Dziunikowska; V. Eckardt; U. Ecker; M. Erdmann; A. Eskreys; J. Figiel; H.J. Gebauer; D. F. Geesaman; R. Gilman; M.C. Green; J. Haas; C. Halliwell; J. Hanlon
The production of charged hadrons is studied in μXe and μD interactions at 490 GeV beam energy. The data were taken at the Tevatron at Fermilab with the E665 spectrometer, equipped with a streamer chamber as vertex detector. Differences between the μXe and μD data are explained by cascading of hadrons in the Xe nucleus. The average multiplicity of charged hadrons in μXe scattering is compared to previously published pXe scattering data and is found to be strongly reduced. This is traced back to the low number of ‘projectile’ collisions in μXe interactions. From a study of thexBj dependence of hadron production in μXe scattering, and by considering events with a large rapidity gap, evidence is found for a significant contribution of diffractive scattering, which is enhanced in the kinematic region where shadowing of the cross section is observed. This result supports recent models in which diffractive scattering and nuclear shadowing are closely related.
Physics Letters B | 1992
M. Adams; S. Aïd; P. L. Anthony; M. D. Baker; J. F. Bartlett; A.A. Bhatti; H. M. Braun; W. Busza; T.J. Carroll; J. M. Conrad; G. Coutrakon; R. Davisson; I. Derado; S. Dhawan; W. Dougherty; T. Dreyer; K. Dziunikowska; V. Eckardt; U. Ecker; M. Erdmann; A. Eskreys; G.Y. Fang; J. Figiel; H.J. Gebauer; D. F. Geesaman; R. Gilman; M.C. Green; J. Haas; C. Halliwell; J. Hanlon
Abstract Inelastic scattering of 490 GeV μ + from deuterium and xenon nuclei has been studied for x Bj > s .001. The ratio of the xenon/deuterium cross section per nucleon is observed to vary with x Bj , with a depletion in the kinematic range 0.001 x Bj Q 2 dependence. An electromagnetic calorimeter was used to verify the radiative corrections.
Journal of Instrumentation | 2008
M. Aleksa; F Astesan; D. Banfi; F. Barreiro; P Barrillon; C Benchouk; W Bertoli; J. Bremer; H. M. Braun; B Canton; L. Carminati; T. Carli; C. Cerna; M. Chalifour; J.L. Chevalley; Mauro Citterio; J. Collot; G. Costa; P. Dargent; B Dekhissi; J. E. Derkaoui; F. Djama; C. Fabre; A Fallou; Marcello Fanti; P. Fassnacht; D. Fournier; C Gabaldon Ruiz; F. Gianotti; J Giner
The construction and the assembly of the two end-caps of the ATLAS liquid argon electromagnetic calorimeter as well as their test and qualification programs are described. The work described here started at the beginning of 2001 and lasted for approximately three years. The results of the qualification tests performed before installation in the LHC ATLAS pit are given. The detectors are now installed in the ATLAS cavern, full of liquid argon and being commissioned. The complete detectors coverage is powered with high voltage and readout.
Journal of Instrumentation | 2010
A. Afonin; A. V. Akimov; T. Barillari; V. Bezzubov; M. Blagov; H. M. Braun; D. Bruncko; Sergey Chekulaev; A. Cheplakov; R. Degele; S. P. Denisov; V. Drobin; P. Eckstein; V. Ershov; V. N. Evdokimov; J. Ferencei; V. Fimushkin; A. Fischer; H. Futterschneider; V. Garkusha; A. Glatte; C. Handel; J. Huber; N. Javadov; M. Y. Kazarinov; A. Khoroshilov; A. E. Kiryunin; E. Kladiva; M. Kobel; A. A. Komar
In this paper it is shown that a measurement of the relative luminosity changes at the LHC may be obtained by analysing the currents drawn from the high voltage power supplies of the electromagnetic section of the forward calorimeter of the ATLAS detector. The method was verified with a reproduction of a small section of the ATLAS forward calorimeter using proton beams of known beam energies and variable intensities at the U-70 accelerator at IHEP in Protvino, Russia. The experimental setup and the data taking during a test beam run in April 2008 are described in detail. A comparison of the measured high voltage currents with reference measurements from beam intensity monitors shows a linear dependence on the beam intensity. The non-linearities are measured to be less than 0.5% combining statistical and systematic uncertainties.
Journal of Physics: Conference Series | 2012
K. Lantzsch; S. Arfaoui; S. Franz; O. Gutzwiller; S. Schlenker; C A Tsarouchas; B. Mindur; J. Hartert; S. Zimmermann; A. A. Talyshev; D. Oliveira Damazio; A. Poblaguev; H. M. Braun; D. Hirschbuehl; S. Kersten; T. A. Martin; P. D. Thompson; D. Caforio; C. Sbarra; D. Hoffmann; S. Nemecek; A. Robichaud-Veronneau; B. M. Wynne; E. Banas; Z. Hajduk; J. Olszowska; E. Stanecka; M. Bindi; A. Polini; M. Deliyergiyev
The ATLAS experiment is one of the multi-purpose experiments at the Large Hadron Collider (LHC) at CERN, constructed to study elementary particle interactions in collisions of high-energy proton beams. Twelve different sub detectors as well as the common experimental infrastructure are controlled and monitored by the Detector Control System (DCS) using a highly distributed system of 140 server machines running the industrial SCADA product PVSS. Higher level control system layers allow for automatic control procedures, efficient error recognition and handling, manage the communication with external systems such as the LHC controls, and provide a synchronization mechanism with the ATLAS data acquisition system. Different databases are used to store the online parameters of the experiment, replicate a subset used for physics reconstruction, and store the configuration parameters of the systems. This contribution describes the computing architecture and software tools to handle this complex and highly interconnected control system.
Physics Letters B | 1993
M. Adams; S. Aïd; P. L. Anthony; M. D. Baker; J. F. Bartlett; A.A. Bhatti; H. M. Braun; W. Busza; T.J. Carroll; J. M. Conrad; G. Coutrakon; R. Davisson; I. Derado; S. Dhawan; W. Dougherty; T. Dreyer; K. Dziunikowska; V. Eckardt; U. Ecker; M. Erdmann; A. Eskreys; J. Figiel; H.J. Gebauer; D. F. Geesaman; R. Gilman; M.C. Green; J. Haas; C. Halliwell; J. Hanlon; D. Hantke
We present results on the cross-section ratio for inelastic muon scattering on neutrons and protons as a function of Bjorken chi;. The data extend to χ values two orders of magnitude smaller than in previous measurements, down to 2×10-5, for Q2>0.01 GeV2. The ratio is consistent with unity throughout this new range.
Physical Review D | 1996
M. Adams; U. Ecker; S. Kaufman; C. Halliwell; H.J. Gebauer; D.G. Michael; R.D. Kennedy; V. Eckardt; P. Madden; T. Zhao; C.W. Salgado; S. Wolbers; T. Dreyer; W. Dougherty; J. Novak; R.W. Finlay; J. Haas; B. Pawlik; K. Olkiewicz; H. G. E. Kobrak; Baker; N. Schmitz; W. Wittek; A. Röser; L.S. Osborne; H.E. Stier; A. Banerjee; D. F. Geesaman; R.A. Swanson; A. Manz
Physical Review Letters | 1995
M. Adams; C. Halliwell; R.A. Swanson; R.D. Kennedy; V. Eckardt; M. Wilhelm; N. Schmitz; K. Olkiewicz; H. Schellman; S. Kunori; D. McLeod; H. M. Braun; G. Jancso; G. Siegert; H. J. Lubatti; J. M. Conrad; R.B. Nickerson; J. Morfin; A.A. Bhatti; S. Aïd; J. J. Lord; S. Wolbers; J. Haas; A. Manz; W. Wittek; K. Hicks; W. Busza; K.A. Griffioen; B. Baller; A. Salvarani
Physical Review D | 1993
M. Adams; S. Aied; P.L. Anthony; Baker; J. F. Bartlett; A.A. Bhatti; H. M. Braun; W. Busza; J. M. Conrad; G. Coutrakon; R. Davisson; I. Derado; S. Dhawan; W. Dougherty; T. Dreyer; K. Dziunikowska; V. Eckardt; U. Ecker; M. Erdmann; A. Eskreys; J. Figiel; H.J. Gebauer; D. F. Geesaman; R. Gilman; M.C. Green; J. Haas; C. Halliwell; J. Hanlon; D. Hantke; V. W. Hughes