Institution
Sofia University
Education•Sofia, Bulgaria•
About: Sofia University is a education organization based out in Sofia, Bulgaria. It is known for research contribution in the topics: Large Hadron Collider & Standard Model. The organization has 8533 authors who have published 15730 publications receiving 306320 citations. The organization is also known as: University of Sofia & BFUS.
Topics: Large Hadron Collider, Standard Model, Population, Lepton, Laser
Papers published on a yearly basis
Papers
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Vardan Khachatryan, Albert M. Sirunyan, Armen Tumasyan, Wolfgang Adam1 +2112 more•Institutions (144)
TL;DR: In this paper, an inclusive search for supersymmetry in events with at least one b-tagged jet is performed using proton-proton collision data collected by the CMS experiment in 2012 at a center-of-mass energy of 8 TeV.
Abstract: An inclusive search for supersymmetry in events with at least one b-tagged jet is performed using proton-proton collision data collected by the CMS experiment in 2012 at a center-of-mass energy of 8 TeV. The data set size corresponds to an integrated luminosity of 19.3 fb^(−1). The two-dimensional distribution of the razor variables R^2 and M _R is studied in events with and without leptons. The data are found to be consistent with the expected background, which is modeled with an empirical function. Exclusion limits on supersymmetric particle masses at a 95% confidence level are derived in several simplified supersymmetric scenarios for several choices of the branching fractions. By combining the likelihoods of a search in events without leptons and a search that requires a single lepton (electron or muon), an improved bound on the top-squark mass is obtained. Assuming the lightest supersymmetric particle to be stable and weakly interacting, and to have a mass of 100 GeV, the branching-fraction-dependent (-independent) production of gluinos is excluded for gluino masses up to 1310 (1175) GeV. The corresponding limit for top-squark pair production is 730 (645) GeV.
93 citations
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TL;DR: In this paper, a method for determination of the three-phase contact angle at the surface of a micrometer-sized particle (latex sphere, oil droplet, or biological cell) is described.
Abstract: A novel method for determination of the three-phase contact angle at the surface of a micrometer-sized particle (latex sphere, oil droplet, or biological cell) is described. The particle is entrapped within a liquid filmofequilibriumthicknesssmallerthantheparticlediameter. Thusaliquidmeniscus(alayerofuneven thickness) is formed around the particle. When observed in reflected monochromatic light, this meniscus appearsasaninterferencepatternofconcentricbrightanddarkfringes. Fromtheradiioftheinterference fringes, one can restore the meniscus shape by using the solution of the Laplace equation of capillarity. In this way the three-phase contact angle of the particle and the capillary pressure can be determined. We demonstrate the applicability of our method to latex spheres from several batch samples (between 1 and 7 Im in diameter) and to oil droplets, stabilized by adsorbed protein layer. The numerical procedures used for contact angle determination are described, and illustrative results are presented and discussed.
93 citations
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TL;DR: In this paper, a method for producing membranes for optical pH sensors is described, where pH indicators (neutral red and Congo red) are covalently bonded to a transparent acetylcellulose film.
93 citations
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TL;DR: In this paper, the effect of the particle and grain sizes as well as of the milling duration on the temperature of hydrogen desorption and on the dehydriding kinetics of the ball-milled MgH2+Nb2O5 powders was analyzed.
93 citations
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Joint Institute for Nuclear Research1, Hungarian Academy of Sciences2, Polish Academy of Sciences3, University of Marburg4, Goethe University Frankfurt5, GSI Helmholtz Centre for Heavy Ion Research6, Comenius University in Bratislava7, CERN8, National and Kapodistrian University of Athens9, Charles University in Prague10, University of Washington11, Sofia University12, Max Planck Society13, Eötvös Loránd University14, Jan Kochanowski University15, University of Houston16, University of Warsaw17, Massachusetts Institute of Technology18, Pusan National University19
TL;DR: The Lambda/pi ratio at midrapidity and in full phase space shows a pronounced maximum between the highest BNL Alternating Gradient Synchrotron and 40A GeV CERN Super Proton Synchrotsron energies, whereas the Lambda-pi ratio exhibits a monotonic increase.
Abstract: Production of Lambda and Antilambda hyperons was measured in central Pb-Pb collisions at 40, 80, and 158A GeV beam energy on a fixed target. Transverse mass spectra and rapidity distributions are given for all three energies. The Lambda/pi ratio at midrapidity and in full phase space shows a pronounced maximum between the highest BNL Alternating Gradient Synchrotron and 40A GeV CERN Super Proton Synchrotron energies, whereas the Lambda/pi ratio exhibits a monotonic increase.
93 citations
Authors
Showing all 8600 results
Name | H-index | Papers | Citations |
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Michael Tytgat | 134 | 1449 | 94133 |
Leander Litov | 133 | 1424 | 92713 |
Eric Conte | 132 | 1206 | 84593 |
Georgi Sultanov | 132 | 1493 | 93318 |
Plamen Iaydjiev | 131 | 1285 | 87958 |
Anton Dimitrov | 130 | 1236 | 86919 |
Jordan Damgov | 129 | 1195 | 85490 |
Borislav Pavlov | 129 | 1245 | 86458 |
Jean-Laurent Agram | 128 | 1221 | 84423 |
Cristina Botta | 128 | 1160 | 79070 |
Jean-Charles Fontaine | 128 | 1190 | 84011 |
Peicho Petkov | 128 | 1111 | 83495 |
Muhammad Ahmad | 128 | 1187 | 79758 |
Roumyana Hadjiiska | 126 | 1003 | 73091 |
Mircho Rodozov | 124 | 972 | 70519 |