816 research outputs found
Messung des totalen Proton-Proton Wirkungsquerschnitts an den CERN-Speicherringen im Schwerpunktsenergiebereich von 23 bis 63 GeV
No full textMultiwire proportional chamber spectrometer for the CERN Intersecting Storage Rings
No full textThe design, construction, and performance of a multiwire proportional chamber (MWPC) system ( approximately 10 k wires) constructed for use at the CERN Intersecting Storage Rings (ISR) is described. This system employs hybrid integrated circuitry for pulse detection and storage, and is read out via a CAMAC compatible system. The chambers plus two large-aperture magnets with accompanying scintillation and Cherenkov counters form a versatile multiparticle spectrometer system which has been used to investigate particle systems produced near 0 at the CERN ISR. (11 refs)
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[High Energy Physics Program at the University of Alabama. Final report]
No full textThe High Energy Physics group at University of Alabama is a member of the L3 collaboration studying e+e{minus} collisions near the Z{degree} pole at the LEP accelerator at CERN. About 2 million Z{degree} events have been accumulated and the experiment has been prolific in publishing results on the Z resonance parameters, the Z couplings to all leptons and quarks with mass less than half the Z mass, searches for new particles and interactions, and studies of strong interactions and/or weak charged current decays of the quarks and leptons abundantly produced in Z decays. The group is contributing to data analysis as well as to detector hardware. In particular, the authors are involved in a major hardware upgrade for the experiment, namely the design, construction and commissioning of a Silicon Microvertex Detector (SMD) which has successfully been installed for operation during the present grant period. The authors present here a report on their recent L3 activities and their plans for the next grant period of twelve months (April 1, 1994--March 31, 1995). Their main interests in data analysis are in the study of single photon final states and the physics made more accessible by the SMD, such as heavy flavor physics. Their hardware efforts continue to be concentrated on the high precision capacitive and optical alignment monitoring systems for the SMD and also includes gas monitoring for the muon system. They are also planning to participate in the coming upgrade of the L3 detector
Measurement of the hadronic photon structure function F(2)(gamma) with the L3 detector at LEP
No full textThe photon is one of the basic components of our present understanding of elementary particles and their interactions. The theory of Quantum Electrodynamics describes this object as being the mediator of the electromagnetic force between charged particles. Contrary to earlier assumptions the photon turns out to have a "structure" due to quantum fluctuations into fermion anti-fermion pairs that can further interact with other particles. In this case the photon reveals its structure. The structure of the photon can be described by the concept of photon structure functions, which are studied at high energy accelerators like the Large Electron Positron Collider at the European Center for Particle Physics. With the large amount of data (L = 608 pb-1) collected with the L3 detector at center-of-mass energies 189 GeV < s < 209 GeV and the analysis method used in this dissertation, a measurement of the hadronic structure function F2gamma (x,Q2)/alpha is obtained with better precision than previous measurements. The evolution of F2 gamma/alpha as a function of x and Q2 is studied in the 11 GeV2 < Q2 < 34 GeV2 and 0.006 < x < 0.556 intervals. Due to the precision of this measurement it is possible for the first time to demonstrate that the results of the higher-order GRV parametrization of the structure function are in good agreement with the data and give a correct description of the physical processes involved
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Annual report for the High Energy Physics Program at The University of Alabama
No full textThe High Energy Physics group at University of Alabama is a member of the L3 collaboration studying e{sup +}e{sup {minus}} collisions near the Z{degree} pole at the LEP accelerator at CERN. About 2 million Z{degree} events have been accumulated and the experiment has been prolific in publishing results on the Z resonance parameters, the Z couplings to all leptons and quarks with mass less than half the Z mass, searches for new particles and interactions, and studies of strong interactions and/or weak charged current decays of quarks and leptons abundantly produced in Z decays. They are contributing to data analysis as well as to detector hardware. In particular, they are involved in a major hardware upgrade for the experiment, namely the design, construction and commissioning of a Silicon Microvertex Detector (SMD) which has successfully been installed for operation during the present grant period. A report is presented on their recent L3 activities and their plans for the next grant period of twelve months (April 1, 1994--March 31, 1995). Their main interests in data analysis are in the study of single photon final states and the physics made more accessible by the SMD, such as heavy flavor physics. Their hardware efforts continue to be concentrated on the high precision capacitive and optical alignment monitoring systems for the SMD and also includes gas monitoring for the muon system. They are also planning to participate in the coming upgrade of the L3 detector
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High Energy Physics Program at the University of Alabama
No full textThis report discusses the following topics: study of Z{sup 0} decays; QCD; new particles; Higgs bosons; and forward hadron calorimeter system
Study Of The Solar Anisotropy Of Cosmic Ray Primaries Of About 200 GeV Energy With The L3+C Muon Detector
No full textContext. Primary cosmic rays experience multiple deflections in the non-uniform galactic and heliospheric magnetic fields which may generate anisotropies. Aims. A study of anisotropies in the energy range between 100 and 500 GeV is performed. This energy range is not yet well explored. Methods. The L3 detector at the CERN electron-positron collider, LEP, is used for a study of the angular distribution of atmospheric muons with energies above 20 GeV. This distribution is used to investigate the isotropy of the time-dependent intensity of the primary cosmic-ray flux with a Fourier analysis. Results. A small deviation from isotropy at energies around 200 GeV is observed for the second harmonics at the solar frequency. No sidereal anisotropy is found at a level above 10ˉ⁴. The measurements were performed in the years 1999 and 2000
Proposal for an improvement of experiment R605 in 1976: an improved set-up to search for muon electron coincidences and hadronic states of new particles at the ISR
No full textGenus Leucanthemum in Flora Jugoslaviae
No full textU ovom prilogu obrađen je s florističko-sistematskog gledišta rod Leucanthemum, i to u pogledu onih vrsta koje su do sada poznate kao autohtone na području Jugoslavije, a na način kako će biti prikazan u kolektivnom djelu »Analitička flora Jugoslavije«, kojega je izradba već u toku. Razlozi koji su nas ponukali da se na ovom mjestu ponovo osvrnemo baš na rod Leucanthemum jesu različiti. Prije svega je poznato da su, od vremena kada je o istoj temi u ovom časopisu objavljen naš posljednji prilog (Horvatić 1935), neke vrste roda Leucanthemum bile u više navrata predmetom citoloških istraživanja s obzirom na broj kromosoma (Darlington, C. D. - Wylie, A.P. 1950; D uckert, M. -Favarger, C. 1956; Baksay, L. 1957; Favarger, C. 1959; Papeš, D. 1962'), koja su njihove sistematske odnose stavila djelomično u novo svjetlo. U isto vrijeme vršena su i neka detaljnija istraživanja u pogledu građe plodova pojedinih vrsta toga roda1 2, što je također znatno pridonijelo njihovu bližem poznavanju. I napokon, u toku posljednjih decenija stečena su također vrlo znatna nova iskustva u pogledu raspro- stranjenja i fitocenološke pripadnosti nekih vrsta roda Leucanthemum na teritoriju Jugoslavije. Rezultati svih tih istraživanja izneseni su, dakle, u ovom prvom prilogu »Građi za floru Jugoslavije«
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