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Institution

Moscow Institute of Physics and Technology

EducationDolgoprudnyy, Russia
About: Moscow Institute of Physics and Technology is a education organization based out in Dolgoprudnyy, Russia. It is known for research contribution in the topics: Laser & Large Hadron Collider. The organization has 8594 authors who have published 16968 publications receiving 246551 citations. The organization is also known as: MIPT & Moscow Institute of Physics and Technology (State University).


Papers
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Journal ArticleDOI
TL;DR: In this article, a search for direct top-squark pair production is presented based on proton-proton collision data at a center-of-mass energy of 13 TeV recorded by the CMS experiment at the LHC during 2016, 2017, and 2018, corresponding to an integrated luminosity of 137 fb−1.
Abstract: A search for direct top squark pair production is presented. The search is based on proton-proton collision data at a center-of-mass energy of 13 TeV recorded by the CMS experiment at the LHC during 2016, 2017, and 2018, corresponding to an integrated luminosity of 137 fb−1. The search is carried out using events with a single isolated electron or muon, multiple jets, and large transverse momentum imbalance. The observed data are consistent with the expectations from standard model processes. Exclusions are set in the context of simplified top squark pair production models. Depending on the model, exclusion limits at 95% confidence level for top squark masses up to 1.2 TeV are set for a massless lightest supersymmetric particle, assumed to be the neutralino. For models with top squark masses of 1 TeV, neutralino masses up to 600 GeV are excluded.

63 citations

Journal ArticleDOI
I. Jaegle, I. Adachi1, Hiroaki Aihara2, S. Al Said3, S. Al Said4, D. M. Asner5, T. Aushev6, R. Ayad3, A. M. Bakich7, Vikas Bansal5, M. Barrett, B. Bhuyan8, A. Bozek9, M. Bračko10, T. E. Browder, D. Červenkov11, M. C. Chang12, Byung Gu Cheon13, K. Chilikin, Kyung-Suk Cho14, V. Chobanova15, S. K. Choi16, Y. Choi17, D. Cinabro18, J. Dalseno15, Z. DoleŽal11, Z. Drásal11, A. Drutskoy19, D. Dutta8, Semen Eidelman20, D. A. Epifanov2, H. Farhat18, J. E. Fast5, T. Ferber, O. Frost, V. Gaur21, N. Gabyshev20, S. Ganguly18, A. Garmash20, D. Getzkow22, R. Gillard18, Y. M. Goh13, B. Golob23, O. Grzymkowska9, K. Hayasaka24, H. Hayashii25, X. H. He26, M. T. Hedges, W. S. Hou27, Toru Iijima24, K. Inami24, A. Ishikawa28, Y. Iwasaki, T. Julius29, K. H. Kang30, E. Kato28, T. Kawasaki31, D. Y. Kim32, J. B. Kim33, Jung-Hyun Kim14, S. H. Kim13, K. Kinoshita34, B. R. Ko33, Peter Kodys11, Samo Korpar10, P. Križan23, P. Krokovny20, A.S. Kuzmin20, Y. J. Kwon35, J. S. Lange22, I. S. Lee13, Philip Lewis, L. Li Gioi15, J. Libby36, D. Liventsev, D. Matvienko20, H. Miyata31, R. Mizuk19, G. B. Mohanty21, A. Moll15, R. Mussa, E. Nakano37, M. Nakao1, N. K. Nisar21, S. Nishida1, S. Ogawa38, P. Pakhlov19, G. Pakhlova, H. Park30, T. K. Pedlar39, L. Pesántez40, M. Petrič, L. E. Piilonen41, M. Ritter15, A. Rostomyan, Y. Sakai1, S. Sandilya21, L. Santelj, T. Sanuki28, Yuki Sato24, V. Savinov42, O. Schneider43, G. Schnell44, G. Schnell45, C. Schwanda46, D. Semmler22, K. Senyo47, O. Seon24, Ihn Sik Seong, M. E. Sevior29, V.E. Shebalin20, T. A. Shibata48, J. G. Shiu27, B.A. Shwartz20, F. Simon15, R. Sinha, Y. S. Sohn35, M. Starič, M. Sumihama49, K. Sumisawa1, U. Tamponi50, G. Tatishvili5, Y. Teramoto37, F. Thorne46, M. Uchida48, S. Uehara1, Yoshinobu Unno13, S. Uno1, S. E. Vahsen, C. Van Hulse44, P. Vanhoefer15, G. Varner, A. Vinokurova20, M. N. Wagner22, C. H. Wang51, M. Z. Wang27, P. Wang, X. L. Wang41, M. Watanabe31, Y. Watanabe52, K. M. Williams41, E. Won33, J. Yamaoka5, S. Yashchenko, Y. Yook35, Y. Yusa31, V.N. Zhilich20, Vladimir Zhulanov20, A. Zupanc 
TL;DR: Individual and combined 90% credibility level upper limits are obtained on the branching fraction times the Born cross section, B×σ_{Born}, on the BornCross section σ_{Born, and on the dark photon coupling to the dark Higgs boson times the kinetic mixing between the standard model photon and the dark photons, α_{D}×ε^{2}.
Abstract: The dark photon A' and the dark Higgs boson h' are hypothetical constituents featured in a number of recently proposed dark sector models. Assuming prompt decays of both dark particles, we search for their production in the so-called Higgstrahlung channel e(+)e(-) -> A'h', with h' -> A'A'. We investigate ten exclusive final states with A' -> e(+)e(-), mu(+)mu(-), or pi(+)pi(-) in the mass ranges 0.1 GeV/c(2) < m(A') < 3.5 GeV/c(2) and 0.2 GeV/c(2) < m(h') < 10.5 GeV/c(2). We also investigate three inclusive final states 2(e(+)e(-))X, 2(mu(+)mu(-))X, and (e(+)e(-))(mu(+)mu(-))X, where X denotes a dark photon candidate detected via missing mass, in the mass ranges 1.1 GeV/c(2) < m(A') < 3.5 GeV/c(2) and 2.2 GeV/c(2) < m(h') < 10.5 GeV/c(2). Using the entire 977 fb(-1) data set collected by Belle, we observe no significant signal. We obtain individual and combined 90% credibility level upper limits on the branching fraction times the Born cross section, B x sigma(Born), on the Born cross section sigma(Born), and on the dark photon coupling to the dark Higgs boson times the kinetic mixing between the standard model photon and the dark photon, alpha(D) x epsilon(2). These limits improve upon and cover wider mass ranges than previous experiments. The limits from the final states 3(pi(+)pi(-)) and 2(e(+)e(-))X are the first placed by any experiment. For alpha(D) equal to 1/137, m(h') < 8 GeV/c(2), and m(A') < 1 GeV/c(2), we exclude values of the mixing parameter epsilon above similar to 8 x 10(-4).

63 citations

Posted Content
TL;DR: A unified analysis of a large family of variants of proximal stochastic gradient descent, which so far have required different intuitions, convergence analyses, have different applications, and which have been developed separately in various communities is introduced.
Abstract: In this paper we introduce a unified analysis of a large family of variants of proximal stochastic gradient descent ({\tt SGD}) which so far have required different intuitions, convergence analyses, have different applications, and which have been developed separately in various communities. We show that our framework includes methods with and without the following tricks, and their combinations: variance reduction, importance sampling, mini-batch sampling, quantization, and coordinate sub-sampling. As a by-product, we obtain the first unified theory of {\tt SGD} and randomized coordinate descent ({\tt RCD}) methods, the first unified theory of variance reduced and non-variance-reduced {\tt SGD} methods, and the first unified theory of quantized and non-quantized methods. A key to our approach is a parametric assumption on the iterates and stochastic gradients. In a single theorem we establish a linear convergence result under this assumption and strong-quasi convexity of the loss function. Whenever we recover an existing method as a special case, our theorem gives the best known complexity result. Our approach can be used to motivate the development of new useful methods, and offers pre-proved convergence guarantees. To illustrate the strength of our approach, we develop five new variants of {\tt SGD}, and through numerical experiments demonstrate some of their properties.

63 citations

Journal ArticleDOI
TL;DR: In this article, the authors report a very high and reproducible JE in practical HTS wires based on a simple YBa2Cu3O7 (YBCO) superconductor formulation with Y2O3 nanoparticles, which have been delivered in just nine months to a commercial fusion customer.
Abstract: The fusion power density produced in a tokamak is proportional to its magnetic field strength to the fourth power Second-generation high temperature superconductor (2G HTS) wires demonstrate remarkable engineering current density (averaged over the full wire), JE, at very high magnetic fields, driving progress in fusion and other applications The key challenge for HTS wires has been to offer an acceptable combination of high and consistent superconducting performance in high magnetic fields, high volume supply, and low price Here we report a very high and reproducible JE in practical HTS wires based on a simple YBa2Cu3O7 (YBCO) superconductor formulation with Y2O3 nanoparticles, which have been delivered in just nine months to a commercial fusion customer in the largest-volume order the HTS industry has seen to date We demonstrate a novel YBCO superconductor formulation without the c-axis correlated nano-columnar defects that are widely believed to be prerequisite for high in-field performance The simplicity of this new formulation allows robust and scalable manufacturing, providing, for the first time, large volumes of consistently high performance wire, and the economies of scale necessary to lower HTS wire prices to a level acceptable for fusion and ultimately for the widespread commercial adoption of HTS

63 citations

Journal ArticleDOI
TL;DR: Two orders of magnitude decay of the electron density within 2 ns was obtained by combined use of the interferometry and newly proposed terahertz scattering techniques.
Abstract: Transverse plasma distribution with 10(17) cm(-3) maximum electron density and 150 μm transverse size in a plasma filament formed in air by an intense femtosecond laser pulse was measured by means of optical interferometry. Two orders of magnitude decay of the electron density within 2 ns was obtained by combined use of the interferometry and newly proposed terahertz scattering techniques. Excellent agreement was obtained between the measured plasma density evolution and theoretical calculation.

63 citations


Authors

Showing all 8797 results

NameH-indexPapersCitations
Dominique Pallin132113188668
Vladimir N. Uversky13195975342
Lee Sawyer130134088419
Dmitry Novikov12734883093
Simon Lin12675469084
Zeno Dixon Greenwood126100277347
Christian Ohm12687369771
Alexey Myagkov10958645630
Stanislav Babak10730866226
Alexander Zaitsev10345348690
Vladimir Popov102103050257
Alexander Vinogradov9641040879
Gueorgui Chelkov9332141816
Igor Pshenichnov8336222699
Vladimir Popov8337026390
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
202368
2022238
20211,774
20202,246
20192,112
20181,902