Searches for New Physics in Photonic Final States at LEP

A brief review of searches for physics beyond the Standard Model in photonic final states at LEP is given here. These include searches for supersymmetry, large extra dimensions and contact interactions. Recent results from all four LEP experiments are presented, including improved limits on the new scale of gravity for models with large extra dimensions and the most precise direct measurement of the number of light neutrino species. Status and prospects of the LEP combined searches are also discussed.Comment: 3 pages, 4 figures, talk presented at the International Europhysics Conference on High Energy Physics EPS, July 17th-23rd 2003, Aachen, German

Inclusive Search for the Standard Model Higgs Boson in the H->gamma+gamma Channel at the LHC with CMS

A brief summary of the CMS discovery potential for the Standard Model Higgs boson in the H->gamma+gamma channel is presented. We review both a standard cut-based search and a more optimized analysis that takes advantage of the wide range of signal/background expectations as function of the possible selection cuts. As the Higgs discovery in this channel will rely heavily on performance of the CMS electromagnetic calorimeter, the relevant aspects of its design and operation in situ at the LHC are also briefly discussed.Comment: ICHEP08 proceedings, 3 pages, 2 figures; Higgs, LH

Searches for Gauge-Mediated SUSY Breaking Topologies with the L3 Detector at LEP

Searches for topologies predicted by gauge-mediated SUSY breaking models were performed using data collected with the L3 detector at LEP. All possible lifetimes of the next-to-lightest SUSY particle (NLSP), neutralino or scalar tau, were considered. No evidence for these new phenomena was found and limits on the production cross sections and sparticle masses were derived. A scan over the parameters of the minimal GMSB model was performed, leading to lower limits of 62.2 GeV, 11 TeV, and 0.07 eV on the NLSP mass, the mass scale parameter Lambda, and the gravitino mass, respectively. The status of the LEP combined searches is also discussed.Comment: 4 pages, 2 figures, 1 table; to appear in Proceedings of SUSY06, the 14th International Conference on Supersymmetry and the Unification of Fundamental Interactions, UC Irvine, California, 12-17 June 200

CONSTITUTIONAL (STATUTORY) JUSTICE AS AN ELEMENT OF THE STATE-LEGAL SYSTEM OF THE CONSTITUENT ENTITIES OF THE RUSSIAN FEDERATION

Abstract. The article is devoted to the possibility of implementing the constitutional control by the judicial bodies within the framework of the principle of unity of the judicial system. The authors analyzed the federal and regional legislation regulating the activities of constitutional (statutory) justice. We identified the distinctive features of constitutional and statutory courts in the Russian Federation, and noted the dual nature of the Constitutional Court of the Russian Federation and the constitutional (statutory) courts of the constituent entities of the Russian Federation. The existence of legal links between constitutional justice bodies brings individual scholars and practitioners to the idea of the existence of a hierarchical relationship between them. At the same time, they completely ignore the fact that such a phenomenon in the form of strengthening the vertical of constitutional control bodies may lead to excessive centralization of judicial power as a whole and centralization of federal and regional legal systems. In this regard, it would be incorrect to speak of constitutional (statutory) courts of the constituent entities of the Russian Federation only as an organizational element of the government of a particular region. As a result of the study, the author concludes that these bodies form different subsystems in a single judicial system andneed further reform in order to ensure constitutional values.Key words: constitutional control, principle of unity, constitutional (statutory) courts, system, relations,judicial system

Test of the τ-model of Bose–Einstein correlations and reconstruction of the source function in hadronic Z-boson decay at LEP

Bose–Einstein correlations of pairs of identical charged pions produced in hadronic Z decays are analyzed in terms of various parametrizations. A good description is achieved using a Lévy stable distribution in conjunction with a model where a particle’s momentum is correlated with its space–time point of production, the τ-model. Using this description and the measured rapidity and transverse momentum distributions, the space–time evolution of particle emission in two-jet events is reconstructed. However, the elongation of the particle emission region previously observed is not accommodated in the τ-model, and this is investigated using an ad hoc modification

Radiation hardness qualification of PbWO_4 scintillation crystals for the CMS Electromagnetic Calorimeter

Ensuring the radiation hardness of PbWO_4 crystals was one of the main priorities during the construction of the electromagnetic calorimeter of the CMS experiment at CERN. The production on an industrial scale of radiation hard crystals and their certification over a period of several years represented a difficult challenge both for CMS and for the crystal suppliers. The present article reviews the related scientific and technological problems encountered

First Measurement of Bose-Einstein Correlations in Proton-Proton Collisions at √s=0.9 and 2.36 TeV at the LHC

Bose-Einstein correlations have been measured using samples of proton-proton collisions at 0.9 and 2.36 TeV center-of-mass energies, recorded by the CMS experiment at the CERN Large Hadron Collider. The signal is observed in the form of an enhancement of pairs of same-sign charged particles with small relative four-momentum. The size of the correlated particle emission region is seen to increase significantly with the particle multiplicity of the event