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Measurement and interpretation of same-sign W boson pair production in association with two jets in pp collisions at (Formula presented.) TeV with the ATLAS detector

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Journal of High Energy physics 2024年第4期2024卷 1-61页

作者： Aad, G. Abbott, B. Abeling, K. Abicht, N.J. Abidi, S.H. Aboulhorma, A. Abramowicz, H. Abreu, H. Abulaiti, Y. Abusleme Hoffman, A.C. Acharya, B.S. Adam Bourdarios, C. Adamczyk, L. Adamek, L. Addepalli, S.V. Addison, M.J. Adelman, J. Adiguzel, A. Adye, T. Affolder, A.A. Afik, Y. Agaras, M.N. Agarwala, J. Aggarwal, A. Agheorghiesei, C. Ahmad, A. Ahmadov, F. Ahmed, W.S. Ahuja, S. Ai, X. Aielli, G. Aikot, A. Ait Tamlihat, M. Aitbenchikh, B. Aizenberg, I. Akbiyik, M. Åkesson, T.P.A. Akimov, A.V. Akiyama, D. Akolkar, N.N. Al Khoury, K. Alberghi, G.L. Albert, J. Albicocco, P. Albouy, G.L. Alderweireldt, S. Aleksa, M. Aleksandrov, I.N. Alexa, C. Alexopoulos, T. Alfonsi, F. Algren, M. Alhroob, M. Ali, B. Ali, H.M.J. Ali, S. Alibocus, S.W. Aliev, M. Alimonti, G. Alkakhi, W. Allaire, C. Allbrooke, B.M.M. Allen, J.F. Allendes Flores, C.A. Allport, P.P. Aloisio, A. Alonso, F. Alpigiani, C. Alvarez Estevez, M. Alvarez Fernandez, A. Alves Cardoso, M. Alviggi, M.G. Aly, M. Amaral Coutinho, Y. Ambler, A. Amelung, C. Amerl, M. Ames, C.G. Amidei, D. Amor Dos Santos, S.P. Amos, K.R. Ananiev, V. Anastopoulos, C. Andeen, T. Anders, J.K. Andrean, S.Y. Andreazza, A. Angelidakis, S. Angerami, A. Anisenkov, A.V. Annovi, A. Antel, C. Anthony, M.T. Antipov, E. Antonelli, M. Anulli, F. Aoki, M. Aoki, T. Aparisi Pozo, J.A. Aparo, M.A. Aperio Bella, L. Appelt, C. Apyan, A. Aranzabal, N. Arcangeletti, C. Arce, A.T.H. Arena, E. Arguin, J.-F. Argyropoulos, S. Arling, J.-H. Arnaez, O. Arnold, H. Artoni, G. Asada, H. Asai, K. Asai, S. Asbah, N.A. Assamagan, K. Astalos, R. Atashi, S. Atkin, R.J. Atkinson, M. Atmani, H. Atmasiddha, P.A. Augsten, K. Auricchio, S. Auriol, A.D. Austrup, V.A. Avolio, G. Axiotis, K. Azuelos, G. Babal, D. Bachacou, H. Bachas, K. Bachiu, A. Backman, F. Badea, A. Bagnaia, P. Bahmani, M. Bailey, A.J. Bailey, V.R. Baines, J.T. Baines, L. Bakalis, C. Baker, O.K. Bakos, E. Bakshi Gupta, D. Balakrishnan, V. Balasubramanian, R. Baldin, E.M. Balek, P. Ballabene, E. Balli, F. Baltes, L.M. Balunas, W.K. Balz, J. Banas, E. Bandieramont Department of Physics University of Adelaide Department of Physics University of Alberta Department of Physics Ankara University Division of Physics TOBB University of Economics and Technology LAPP Université Savoie Mont Blanc CNRS/IN2P3 APC Université Paris Cité CNRS/IN2P3 High Energy Physics Division Argonne National Laboratory Department of Physics University of Arizona Department of Physics University of Texas at Arlington Physics Department National and Kapodistrian University of Athens Physics Department National Technical University of Athens Department of Physics University of Texas at Austin Institute of Physics Azerbaijan Academy of Sciences Institut de Física d’Altes Energies (IFAE) Barcelona Institute of Science and Technology Institute of High Energy Physics Chinese Academy of Sciences Physics Department Tsinghua University Department of Physics Nanjing University School of Science Shenzhen Campus of Sun Yat-sen University University of Chinese Academy of Science (UCAS) Institute of Physics University of Belgrade Department for Physics and Technology University of Bergen Physics Division Lawrence Berkeley National Laboratory University of California Institut für Physik Humboldt Universität zu Berlin Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics University of Bern School of Physics and Astronomy University of Birmingham Department of Physics Bogazici University Department of Physics Engineering Gaziantep University Department of Physics Istanbul University Facultad de Ciencias y Centro de Investigaciónes Universidad Antonio Nariño Departamento de Física Universidad Nacional de Colombia Dipartimento di Fisica e Astronomia A. Righi Università di Bologna INFN Sezione di Bologna Physikalisches Institut Universität Bonn Department of Physics Boston University Department of Physics Brandeis University Transilvania University of Brasov Horia Hulubei National Institute of Physics and Nuclear Engineering Department of Physics Alexandru

This paper presents the measurement of fiducial and differential cross sections for both the inclusive and electroweak production of a same-sign W-boson pair in association with two jets (W^±W^±jj) using 139 fb⁻¹ of proton-proton collision data recorded at a centre-of-mass energy of s = 13 TeV by the ATLAS detector at the Large Hadron Collider. The analysis is performed by selecting two same-charge leptons, electron or muon, and at least two jets with large invariant mass and a large rapidity difference. The measured fiducial cross sections for electroweak and inclusive W^±W^±jj production are 2.92 ± 0.22 (stat.) ± 0.19 (syst.) fb and 3.38 ± 0.22 (stat.) ± 0.19 (syst.) fb, respectively, in agreement with Standard Model predictions. The measurements are used to constrain anomalous quartic gauge couplings by extracting 95% confidence level intervals on dimension-8 operators. A search for doubly charged Higgs bosons H^±± that are produced in vector-boson fusion processes and decay into a same-sign W boson pair is performed. The largest deviation from the Standard Model occurs for an H^±± mass near 450 GeV, with a global significance of 2.5 standard deviations. © The Author(s) 2024.

关键词： Hadron-Hadron Scattering Vector Boson Production

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A bayesian framework for power system components identification

A bayesian framework for power system components identificat...

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2020 IEEE Power and Energy Society General Meeting, PESGM 2020

作者： Mikhalev, Artem Emchinov, Alexander Chevalier, Samuel Maximov, Yury Vorobev, Petr Moscow Institute of Physics and Technology School of Applied Mathematics and Informatics Russia Massachusetts Institute of Technology Department of Mechanical Engineering United States Los Alamos National Laboratory Center for Nonlinear Studies and Theoretical Division United States Skolkovo Institute of Science and Technology Center for Energy Science and Technology Russia

ISBN: (纸本)9781728155081

Having actual models for power system components, such as generators and loads or auxiliary equipment, is vital for a correct assessment of the power system operating state as well as establishing stability margins. Often, however, a power system operator has limited information about the actual values for power system components' parameters. Even if the model is available, its operating parameters, as well as the control settings, are time-dependent and subject to a real-time identification. Ideally, these parameters should be identified from measurement data, such as PMU signals. However, it is challenging to do this from the ambient measurements in the absence of transient dynamics since the signal to noise ratio (SNR) for such signals is not necessarily big. In this paper, we design a Bayesian framework for on-line identification of power system components' parameters based on ambient phasor measurement unit (PMU) data, that has reliable performance for SNR as low as five and for certain parameters can give good estimations even for unit SNR. Finally, we support the framework by a robust and time-efficient numerical method. We illustrate the approach efficiency on a synchronous generator example. © 2020 IEEE.

关键词： Parameter estimation

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Interacting thermofield doubles and critical behavior in random regular graphs

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Physical Review D 2021年第10期103卷 106013-106013页

作者： O. Valba A. Gorsky Department of Applied Mathematics National Research University Higher School of Economics Moscow 101000 Russia Federal Research Center of Chemical Physics RAS Moscow 119991 Russia Institute of Information Transmission Problems RAS Moscow 127051 Russia Moscow Institute of Physics and Technology Dolgoprudny 141700 Russia

We discuss numerically the nonperturbative effects in exponential random graphs which are analogue of eigenvalue instantons in matrix models. The phase structure of exponential random graphs with chemical potential for C4 μ4 and degree preserving constraint is clarified. The first order phase transition at critical value of chemical potential for C4 μ4RRG into bipartite phase with a formation of fixed number of bipartite clusters is found for ensemble of random regular graphs (RRG). We consider the similar phase transition in mean field version of combinatorial quantum gravity based of the Ollivier graph curvature for RRG supplemented with hard-core constraint and show that a order of a phase transition at μ4CRRG and the structure of emerging phase depend on a vertex degree d in RRG. For d=3 the bipartite closed ribbon emerges at μ4>μ4CRRG while for d>3 the ensemble of isolated or weakly interacting hypercubes supplemented with the bipartite closed ribbon gets emerged at the first order phase transition with a clear-cut hysteresis. If the additional connectedness condition is imposed the phase at μ4>μ4CRRG gets identified as the closed chain of weakly coupled hypercubes. Since the ground state of isolated hypercube is the thermofield double we suggest that the dual holographic picture involves multiboundary wormholes. Treating RRG as a model of a Hilbert space for a interacting many-body system we discuss the patterns of the Hilbert space fragmentation at the phase transition. We also briefly comment on a possible relation of the found phase transition to the problem of holographic interpretation of a partial deconfinement transition in the gauge theories.

关键词： Critical phenomena Discontinuous phase transition Topological phase transition

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Exceptional collections and phantoms of special Dolgachev surfaces

arXiv

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arXiv 2023年

作者： Karzhemanov, Ilya Katzarkov, Ludmil Laboratory of AGHA Moscow Institute of Physics and Technology 9 Institutskiy per. Moscow Region Dolgoprudny141701 Russia University of Miami Coral GablesFL United States Institute of Mathematics and Informatics Bulgarian Academy of Sciences Acad. Georgi Bonchev Str. Block 8 Sofia1113 Bulgaria National Research University Higher School of Economics Laboratory of Mirror Symmetry NRU HSE 6 Usacheva str. Moscow119048 Russia

We provide an explicit description of exceptional collection of maximal length in the derived category Db(Y) for a particular class of elliptic surfaces Y . The existence of non - trivial semiorthogonal complement (a ...

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Unusual chemical bond and spectrum of beryllium dimer in ground X1Σg+ state

arXiv

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arXiv 2023年

作者： Mitin, A.V. Gusev, A.A. Chuluunbaatar, O. Vinitsky, S.I. Derbov, V.L. Luong, Le Hai Chuluunbaatar, G. Moscow Institute of Physics and Technology Moscow Region Dolgoprudny141700 Russia Joint Institute for High Temperatures of RAS Moscow125412 Russia Joint Institute for Nuclear Research Moscow Region Dubna141980 Russia Dubna State University Moscow Region Dubna141980 Russia Institute of Mathematics and Digital Technology Mongolian Academy of Sciences Ulaanbaatar13330 Mongolia School of Applied Sciences Mongolian University of Science and Technology Ulaanbaatar14191 Mongolia Peoples’ Friendship University of Russia RUDN University Moscow117198 Russia N.G. Chernyshevsky Saratov National Research State University Saratov410012 Russia Ho Chi Minh City University of Education Ho Chi Minh City Viet Nam

This review outlines the main results which lead to understanding the dual nature of the chemical bond in diatomic beryllium molecule in the ground X1Σg+ state. It has been shown that the beryllium atoms are covalently bound at low-lying vibrational energy levels (ν = 0 − 4), while at higher ones (ν = 5 − 11) they are bound by van der Waals forces near the right turning points. High precision ab initio quantum mechanical calculations of Be2 resulted in the development of the modified expanded Morse oscillator potential function which contains all twelve vibrational energy levels [A.V. Mitin, Chem. Phys. Lett. 682, 30 (2017)]. The dual nature of chemical bond in Be2 is evidenced as a sharp corner on the attractive branch of the ground state potential curve. Moreover, it has been found that the Douglas-Kroll-Hess relativistic corrections also show a sharp corner when presented in dependence on the internuclear separation. The difference in energy between the extrapolated and calculated multi-reference configuration interaction energies in dependence on the internuclear separation also exhibits singular point in the same region. The calculation of vibrational-rotational spectrum for the modified expanded Morse oscillator potential function and for function obtained with Slater-type orbitals [M. Lesiuk et al, Chem. Theory Comput. 15, 2470 (2019)] of the bound states of the beryllium dimer in the ground state was also considered in this review. Special attention was paid to the first calculations of the metastable vibrational-rotational complex-valued energy levels and the scattering length of the ground electronic state embedded in the continuum, along with the first theoretical estimations of the upper and lower border limits for the calculated vibrational-rotational energy levels of the bound as well as the metastable states. Such calculations are important for laser spectroscopy. © 2023, CC0.

关键词： Van der Waals forces

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On Products of Random Matrices

arXiv

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arXiv 2022年

作者： Amburg, Natalia Yur'evich Orlov, Aleksander Vasiliev, Dmitry A.I. Alikhanov Institute for Theoretical and Experimental Physics of NRC "Kurchatov Institute" B. Cheremushkinskaya 25 Moscow117259 Russia National Research University Higher School of Economics" Myasnitskaya Ul. 20 Moscow101000 Russia Bolshoy Karetny per. 19 build.1 Moscow127051 Russia Moscow Center for Fundamental and Applied Mathematics Moscow119991 Russia Institute of Oceanology Nahimovskii Prospekt 36 Moscow117997 Russia Moscow Institute of Physics and Technology Dolgoprudny 141701 Russia

We introduce a family of models, which we name matrix models associated with children's drawings-the so-called dessin d'enfant. Dessins d'enfant are graphs of a special kind drawn on a closed connected orientable surface (in the sky). The vertices of such a graph are small disks that we call stars. We attach random matrices to the edges of the graph and get multimatrix models. Additionally, to the stars we attach source matrices. They play the role of free parameters or model coupling constants. The answers for our integrals are expressed through quantities that we call the"spectrum of stars." The answers may also include some combinatorial numbers, such as Hurwitz numbers or characters from group representation theory. © 2022, CC BY.

关键词： Stars

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Mobility Edge in the Anderson model on partially disordered random regular graphs

arXiv

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arXiv 2021年

作者： Valba, Olga Gorsky, A. Department of Applied Mathematics MIEM National Research University Higher School of Economics Moscow Russia Kharkevich Institute for Information Transmission Problems RAS Moscow Russia Moscow Institute for Physics and Technology Dolgoprudny 141700 Russia

In this Letter we study numerically the Anderson model on partially disordered random regular graphs (RRG) considered as the toy model for a Hilbert space of interacting disordered many-body system. The protected subsector of zero-energy states in a many-body system corresponds to clean nodes in RRG ensemble. Using adjacent gap ratio statistics and IPR we find the sharp mobility edge in the spectrum of one-particle Anderson model above some critical density of clean nodes. Its position in the spectrum is almost independent on the disorder strength. The possible application of our result for the controversial issue of mobility edge in the many-body localized (MBL) phase is discussed. © 2021, CC BY.

关键词： Graph theory

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Interacting thermofield doubles and critical behavior in random regular graphs

arXiv

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arXiv 2021年

作者： Gorsky, Alexander Valba, Olga Institute for Information Transmission Problems RAS Moscow127051 Russia Moscow Institute for Physics and Technology Dolgoprudny141700 Russia Department of Applied Mathematics National Research University Higher School of Economics Moscow101000 Russia

We discuss numerically the non-perturbative effects in exponential random graphs which are analogue of eigenvalue instantons in matrix models. The phase structure of exponential random graphs with chemical potential for 4-cycles µ4 and degree preserving constraint is clarified. The first order phase transition at critical value of chemical potential for 4-cycles µRRG4 into bipartite phase with a formation of fixed number of bipartite clusters is found for ensemble of random regular graphs (RRG). We consider the similar phase transition in combinatorial quantum gravity based of the Ollivier graph curvature for RRG supplemented with hard-core constraint and show that a order of a phase transition at µcRRG4 and the structure of emerging phase depend on a vertex degree d in RRG. For d = 3 the bipartite closed ribbon emerges at µ4 > µcRRG4 while for d > 3 the ensemble of isolated or weakly interacting hypercubes supplemented with the bipartite closed ribbon gets emerged at the first order phase transition with a clear-cut hysteresis. If the additional connectedness condition is imposed the phase at µ4 > µcRRG4 gets identified as the closed chain of weakly coupled hypercubes. Since the ground state of isolated hypercube is the thermofield double (TFD) we suggest that the dual holographic picture involves multiboundary wormholes. Treating RRG as a model of a Hilbert space for a interacting many-body system we discuss the patterns of the Hilbert space fragmentation at the phase transition. We also briefly comment on a possible relation of the found phase transition to the problem of holographic interpretation of a partial deconfinement transition in the gauge theories. © 2021, CC BY.

关键词： Graph theory

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Causal machine learning for predicting treatment outcomes

arXiv

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arXiv 2024年

作者： Feuerriegel, Stefan Frauen, Dennis Melnychuk, Valentyn Schweisthal, Jonas Hess, Konstantin Curth, Alicia Bauer, Stefan Kilbertus, Niki Kohane, Isaac S. van der Schaar, Mihaela LMU Munich Munich Germany Munich Center for Machine Learning Munich Germany Department of Applied Mathematics & Theoretical Physics University of Cambridge Cambridge United Kingdom School of Computation Information and Technology TU Munich Munich Germany Helmholtz Munich Munich Germany Department of Biomedical Informatics Harvard Medical School Boston United States Cambridge Centre for AI in Medicine University of Cambridge Cambridge United Kingdom The Alan Turing Institute London United Kingdom

Causal machine learning (ML) offers flexible, data-driven methods for predicting treatment outcomes. Here, we present how methods from causal ML can be used to understand the effectiveness of treatments, thereby supporting the assessment and safety of drugs. A key benefit of causal ML is that allows for estimating individualized treatment effects, as well as personalized predictions of potential patient outcomes under different treatments. This offers granular insights into when treatments are effective, so that decision-making in patient care can be personalized to individual patient profiles. We further discuss how causal ML can be used in combination with both clinical trial data as well as real-world data such as clinical registries and electronic health records. We finally provide recommendations for the reliable use of causal ML in medicine. Copyright © 2024, The Authors. All rights reserved.

关键词： Electronic health record

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An efficient model for the preemptive single machine scheduling of equal-length jobs

arXiv

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arXiv 2020年

作者： Fomin, Artem Goldengorin, Boris Department of Discrete Mathematics Phystech School of Applied Mathematics and Informatics Moscow Institute of Physics and Technology Institutsky lane 9 Dolgoprudny Moscow region141700 Russia

We propose a Boolean Linear Programming model for the preemptive single machine scheduling problem with equal processing times, arbitrary release dates and weights(priorities) minimizing the total weighted completion time. Almost always an optimal solution of the Linear Programming relaxation is integral and can be straightforwardly converted into an optimal schedule. To deal with the fractional solutions we present two heuristics. Very often our heuristics find solutions with objective function values equal to the lower bound found by the Linear Programming relaxation. For the cases when upper bound returned by our heuristics differs from the lower bound we embed the bounds into a Branch and Bound algorithm, which solves the problem to optimality. Exhaustive computational study showed that the algorithm substantially surpasses state-of-the-art methods. © 2020, CC BY.

关键词： Scheduling

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