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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
Albert M. Sirunyan1, Armen Tumasyan1, Wolfgang Adam, Federico Ambrogi  +2239 moreInstitutions (157)
TL;DR: In this paper, a search for the production of Higgs boson pairs in proton-proton collisions at a centre-of-mass energy of 13 TeV is presented, using a data sample corresponding to an integrated luminosity of 35.9fb^(−1) collected with the CMS detector at the LHC.

123 citations

Journal ArticleDOI
C. M. Raiteri1, M. Villata1, Filippo D'Ammando2, Filippo D'Ammando1, Valeri M. Larionov3, Valeri M. Larionov4, Valeri M. Larionov5, Mark Gurwell6, D. O. Mirzaqulov7, Paul S. Smith8, J. A. Acosta-Pulido9, J. A. Acosta-Pulido10, Iván Agudo11, Iván Agudo9, M. J. Arévalo10, M. J. Arévalo9, Rumen Bachev12, Erika Benítez13, A. Berdyugin14, Dmitry A. Blinov15, Dmitry A. Blinov5, G. A. Borman, Markus Böttcher16, Markus Böttcher17, V. Bozhilov18, M. I. Carnerero1, M. I. Carnerero9, M. I. Carnerero10, D. Carosati1, Carolina Casadio9, Wen Ping Chen19, V. T. Doroshenko, Yu. S. Efimov, N. V. Efimova3, N. V. Efimova5, Sh. A. Ehgamberdiev7, José L. Gómez9, Pedro A. Gonzalez-Morales9, David Hiriart13, Sunay Ibryamov12, Y. Jadhav16, Svetlana G. Jorstad11, Svetlana G. Jorstad5, Manasvita Joshi11, V. Kadenius14, S. A. Klimanov3, Meenakshi Kohli16, Tatiana S. Konstantinova5, E. N. Kopatskaya5, Ekaterina Koptelova19, Ekaterina Koptelova20, Givi N. Kimeridze, Omar M. Kurtanidze, Elena G. Larionova5, L. V. Larionova5, R. Ligustri, Elina Lindfors14, Alan P. Marscher11, B. McBreen21, I. M. McHardy22, Y. Metodieva18, Sol N. Molina9, D. A. Morozova5, S. V. Nazarov, M. G. Nikolashvili, Kari Nilsson14, D. N. Okhmat, Evgeni Ovcharov18, Neelam Panwar19, M. Pasanen14, Stoyanka Peneva12, J. Phipps16, N. G. Pulatova23, R. Reinthal14, J. A. Ros, A. C. Sadun24, R. D. Schwartz, Evgeni Semkov12, S. G. Sergeev, Lorand A. Sigua, A. Sillanpää14, N. Smith25, K. A. Stoyanov12, A. Strigachev12, L. O. Takalo14, Brian W. Taylor11, Brian W. Taylor26, Clemens Thum, Ivan S. Troitsky5, Antoniya Valcheva18, Ann E. Wehrle27, Helmut Wiesemeyer28 
TL;DR: In this article, the authors investigated the effects of a geometrical interpretation of the long-term flux variability on the polarization of BL Lacertae and found that the mean optical degree of polarization slightly decreases over the considered period and in general it is higher when the flux is lower.
Abstract: Since the launch of the Fermi satellite, BL Lacertae has been moderately active at ?-rays and optical frequencies until 2011 May, when the source started a series of strong flares. The exceptional optical sampling achieved by the GLAST–AGILE Support Program of the Whole Earth Blazar Telescope in collaboration with the Steward Observatory allows us to perform a detailed comparison with the daily ?-ray observations by Fermi. Discrete correlation analysis between the optical and ?-ray emission reveals correlation with a time lag of 0 ± 1 d, which suggests cospatiality of the corresponding jet emitting regions. A better definition of the time lag is hindered by the daily gaps in the sampling of the extremely fast flux variations. In general, optical flares present more structure and develop on longer time-scales than corresponding ?-ray flares. Observations at X-rays and at millimetre wavelengths reveal a common trend, which suggests that the region producing the mm and X-ray radiation is located downstream from the optical and ?-ray-emitting zone in the jet. The mean optical degree of polarization slightly decreases over the considered period and in general it is higher when the flux is lower. The optical electric vector polarization angle (EVPA) shows a preferred orientation of about 15°, nearly aligned with the radio core EVPA and mean jet direction. Oscillations around it increase during the 2011–2012 outburst. We investigate the effects of a geometrical interpretation of the long-term flux variability on the polarization. A helical magnetic field model predicts an evolution of the mean polarization that is in reasonable agreement with the observations. These can be fully explained by introducing slight variations in the compression factor in a transverse shock waves model.

123 citations

Journal ArticleDOI
Albert M. Sirunyan, Armen Tumasyan, Wolfgang Adam1, Thomas Bergauer1  +2405 moreInstitutions (229)
TL;DR: In this paper, the performance of the reconstruction and identification algorithms for electrons and photons with the CMS experiment at the LHC is presented, based on proton-proton collision data collected at a center-of-mass energy of 13 TeV and recorded in 2016-2018, corresponding to an integrated luminosity of 136 fb$^{-1}$.
Abstract: The performance is presented of the reconstruction and identification algorithms for electrons and photons with the CMS experiment at the LHC. The reported results are based on proton-proton collision data collected at a center-of-mass energy of 13 TeV and recorded in 2016-2018, corresponding to an integrated luminosity of 136 fb$^{-1}$. Results obtained from lead-lead collision data collected at $\sqrt{s_\mathrm{NN}}=$ 5.02 TeV are also presented. Innovative techniques are used to reconstruct the electron and photon signals in the detector and to optimize the energy resolution. Events with electrons and photons in the final state are used to measure the energy resolution and energy scale uncertainty in the recorded events. The measured energy resolution for electrons produced in Z boson decays in proton-proton collision data ranges from 2 to 5%, depending on electron pseudorapidity and energy loss through bremsstrahlung in the detector material. The energy scale in the same range of energies is measured with an uncertainty smaller than 0.1 (0.3)% in the barrel (endcap) region in proton-proton collisions and better than 1 (3)% in the barrel (endcap) region in heavy ion collisions. The timing resolution for electrons from Z boson decays with the full 2016-2018 proton-proton collision data set is measured to be 200 ps.

123 citations

Journal ArticleDOI
David Danko1, Daniela Bezdan, Evan E. Afshin1, Sofia Ahsanuddin2  +678 moreInstitutions (47)
24 Jun 2021-Cell
TL;DR: This paper presented a global atlas of 4,728 metagenomic samples from mass-transit systems in 60 cities over three years, representing the first systematic, worldwide catalog of the urban microbial ecosystem.

123 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