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 & Laser. 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, Laser, Population, Standard Model, Adsorption
Papers published on a yearly basis
Papers
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06 Jun 2003TL;DR: Using a modulated hollow-core waveguide to periodically vary the intensity of the laser light driving the conversion, this technique efficiently generate EUV light even in the presence of substantial ionization, and expects that this technique could form the basis of coherent EUV sources for advanced lithography and high-resolution imaging applications.
Abstract: We demonstrate quasi-phase-matched frequency conversion of laser light into the extreme-ultraviolet via high harmonic generation in a microstructured hollow waveguide. This engineered waveguide extends the cutoff phase-matched energy by 100 eV over a straight waveguide.
259 citations
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University of Valencia1, University of Vienna2, Autonomous University of Barcelona3, Roma Tre University4, University of Silesia in Katowice5, CERN6, Budker Institute of Nuclear Physics7, University of Bari8, SLAC National Accelerator Laboratory9, Goethe University Frankfurt10, Sofia University11, Uppsala University12, Sapienza University of Rome13, Kharkov Institute of Physics and Technology14, Humboldt University of Berlin15, Karlsruhe Institute of Technology16, National Autonomous University of Mexico17, King's College London18, University of Barcelona19, University of Calabria20, Jagiellonian University21, University of Mainz22, University of Bern23, Durham University24, University of Granada25, Princeton University26, Stanford University27
TL;DR: In this paper, the authors discuss the recent theoretical development and experimental progress in kaon physics relevant for the Standard Model tests in the flavor sector, the sensitivity we can reach in probing CPT and Quantum Mechanics from time evolution of entangled-kaon states, the interest for improving on the present measurements of non-leptonic and radiative decays of kaons and eta/eta' mesons, and contribution to understand the nature of light scalar mesons.
Abstract: Investigation at a f-factory can shed light on several debated issues in particle physics. We discuss: (i) recent theoretical development and experimental progress in kaon physics relevant for the Standard Model tests in the flavor sector, (ii) the sensitivity we can reach in probing CPT and Quantum Mechanics from time evolution of entangled-kaon states, (iii) the interest for improving on the present measurements of non-leptonic and radiative decays of kaons and eta/eta' mesons, (iv) the contribution to understand the nature of light scalar mesons, and (v) the opportunity to search for narrow di-lepton resonances suggested by recent models proposing a hidden dark-matter sector. We also report on the e(+)e(-) physics in the continuum with the measurements of (multi) hadronic cross sections and the study of gamma gamma processes.
257 citations
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TL;DR: In this paper, a modulated hollow-core waveguide is used to periodically vary the intensity of the laser light driving the conversion, which can be used to generate high-energy extreme-ultraviolet (EUV) light.
Abstract: High-harmonic generation is a well-known method of producing coherent extreme-ultraviolet (EUV) light, with photon energies up to about 0.5 keV (refs 1, 2). This is achieved by focusing a femtosecond laser into a gas, and high harmonics of the fundamental laser frequency are radiated in the forward direction. However, although this process can generate high-energy photons, efficient high-harmonic generation has been demonstrated only for photon energies of the order 50-100 eV (ref. 5). Ionization of the gas prevents the laser and the EUV light from propagating at the same speed, which severely limits the conversion efficiency. Here we report a technique to overcome this problem, and demonstrate quasi-phase-matched frequency conversion of laser light into EUV. Using a modulated hollow-core waveguide to periodically vary the intensity of the laser light driving the conversion, we efficiently generate EUV light even in the presence of substantial ionization. The use of a modulated fibre shifts the energy spectrum of the high-harmonic light to significantly higher photon energies than would otherwise be possible. We expect that this technique could form the basis of coherent EUV sources for advanced lithography and high-resolution imaging applications. In future work, it might also be possible to generate isolated attosecond pulses.
256 citations
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TL;DR: It is proposed here that the expression of NK receptors on CD8+ T cells can be considered a marker of cytotoxic effector T cells that are expanded in vivo after antigenic activation leading to extensive proliferation.
255 citations
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Vardan Khachatryan, Albert M. Sirunyan, Armen Tumasyan, Wolfgang Adam1 +2127 more•Institutions (146)
TL;DR: In this article, a search for resonances and quantum black holes is performed using the dijet mass spectra measured in proton-proton collisions at s√=8 TeV with the CMS detector at the LHC.
Abstract: A search for resonances and quantum black holes is performed using the dijet mass spectra measured in proton-proton collisions at s√=8 TeV with the CMS detector at the LHC. The data set corresponds to an integrated luminosity of 19.7 fb^(−1). In a search for narrow resonances that couple to quark-quark, quark-gluon, or gluon-gluon pairs, model-independent upper limits, at 95% confidence level, are obtained on the production cross section of resonances, with masses above 1.2 TeV. When interpreted in the context of specific models the limits exclude string resonances with masses below 5.0 TeV; excited quarks below 3.5 TeV; scalar diquarks below 4.7 TeV; W′ bosons below 1.9 TeV or between 2.0 and 2.2 TeV; Z′ bosons below 1.7 TeV; and Randall-Sundrum gravitons below 1.6 TeV. A separate search is conducted for narrow resonances that decay to final states including b quarks. The first exclusion limit is set for excited b quarks, with a lower mass limit between 1.2 and 1.6 TeV depending on their decay properties. Searches are also carried out for wide resonances, assuming for the first time width-to-mass ratios up to 30%, and for quantum black holes with a range of model parameters. The wide resonance search excludes axigluons and colorons with mass below 3.6 TeV, and color-octet scalars with mass below 2.5 TeV. Lower bounds between 5.0 and 6.3 TeV are set on the masses of quantum black holes.
255 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 |