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Institution

Sofia University

EducationSofia, 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.


Papers
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Journal ArticleDOI
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

Journal ArticleDOI
25 Dec 1996-Langmuir
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

Journal ArticleDOI
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

Journal ArticleDOI
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

Journal ArticleDOI
T. Antičić, B. Baatar1, D. Barna2, I. Bartke3, M. Behler4, L. Betev5, Helena Bialkowska, A. Billmeier5, C. Blume6, Bożena Boimska, M. Botje, J. Bracinik7, R. Bramm5, Rene Brun8, Predrag Buncic5, Predrag Buncic8, V. Cerny7, P. Christakoglou9, O. Chvala10, J. G. Cramer11, P. Csato2, N. Darmenov12, Anton Dimitrov12, P. Dinkelaker5, V. Eckardt13, P. Filip13, D. Flierl5, Z. Fodor14, Panagiota Foka6, P. Freund13, V. Friese4, V. Friese6, J. Gál2, Marek Gaździcki5, G. Georgopoulos9, E. Gladysz3, S. Hegyi2, C. Höhne4, Kreso Kadija8, A. Karev13, V. I. Kolesnikov1, Thorsten Sven Kollegger5, E. Kornas3, R. Korus15, Marek Kowalski3, I. Kraus6, Michal Kreps7, M. van Leeuwen, Peter Levai2, Leander Litov12, M. Makariev12, Alexander Malakhov1, Christina Markert6, M. Mateev12, B. W. Mayes16, G. L. Melkumov1, C. Meurer5, Andre Mischke6, M. K. Mitrovski5, Jozsef Molnar2, St Mrówczyński15, G. Pálla2, Apostolos Panagiotou9, D. Panayotov12, K. Perl17, Andreas Petridis9, Miroslav Pikna7, L. S. Pinsky16, F. Pühlhofer4, Jeffrey G. Reid11, Rainer Arno Ernst Renfordt5, W. Retyk17, Christof Roland18, Gunther Roland18, Maciej Rybczyński15, Andrzej Rybicki3, A. Sandoval6, H. Sann6, N. Schmitz13, P. Seyboth13, Ferenc Sikler2, Branislav Sitar7, E. Skrzypczak17, G. Stefanek15, R. Stock5, H. Ströbele5, T. Susa, I. Szentpetery2, J. Sziklai2, T. A. Trainer11, Dezso Varga2, M. Vassiliou9, Gabor Istvan Veres2, Gyorgy Vesztergombi2, D. Vranic6, A. Wetzler5, Zbigniew Wlodarczyk15, I. K. Yoo19, J. Zaranek5, J. Zimányi2 
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

NameH-indexPapersCitations
Michael Tytgat134144994133
Leander Litov133142492713
Eric Conte132120684593
Georgi Sultanov132149393318
Plamen Iaydjiev131128587958
Anton Dimitrov130123686919
Jordan Damgov129119585490
Borislav Pavlov129124586458
Jean-Laurent Agram128122184423
Cristina Botta128116079070
Jean-Charles Fontaine128119084011
Peicho Petkov128111183495
Muhammad Ahmad128118779758
Roumyana Hadjiiska126100373091
Mircho Rodozov12497270519
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
202326
2022141
2021792
2020771
2019769
2018693