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A new Wilson line-based classical action for gluodynamics

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arXiv 2021年

作者： Kakkad, Hiren Kotko, Piotr Stasto, Anna AGH University Of Science and Technology Faculty of Physics and Applied Computer Science Mickiewicza 30 Krakow30-059 Poland The Pennsylvania State University Physics Department 104 Davey Lab University ParkPA16802 United States

We develop a new classical action that in addition to MHV vertices contains also NkMHV vertices, where 1 ≤ k ≤ n − 4 with n the number of external legs. The lowest order vertex is the four-point MHV vertex – there is no three point vertex and thus the amplitude calculation involves fewer vertices than in the CSW method and, obviously, considerably fewer than in the standard Yang-Mills action. The action is obtained by a canonical transformation of the Yang-Mills action in the light-cone gauge, where the field transformations are based on the Wilson line functionals. Copyright © 2021, The Authors. All rights reserved.

关键词： Quantum theory

Electroweak, QCD and flavour physics studies with ATLAS data from Run 2 of the LHC

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physics Reports 2025年 1116卷 57-126页

作者： Aad, G. Aakvaag, E. Abbott, B. Abdelhameed, S. Abeling, K. Abicht, N.J. Abidi, S.H. Aboelela, M. Aboulhorma, A. Abramowicz, H. Abreu, H. Abulaiti, Y. Acharya, B.S. Ackermann, A. Adam Bourdarios, C. Adamczyk, 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. Akbiyik, M. Åkesson, T.P.A. Akimov, A.V. Akiyama, D. Akolkar, N.N. Aktas, S. Al Khoury, K. Alberghi, G.L. Albert, J. Albicocco, P. Albouy, G.L. Alderweireldt, S. Alegria, Z.L. 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. Alsolami, Z.M.K. 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. Amirie, K.J. Amor Dos Santos, S.P. Amos, K.R. An, S. 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. Antipov, E. Antonelli, M. Anulli, F. Aoki, M. Aoki, T. Aparo, M.A. Aperio Bella, L. Appelt, C. Apyan, A. Arbiol Val, S.J. 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. Ashby Pickering, R.A. Assamagan, K. Astalos, R. Astrand, K.S.V. 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. Baer, T.M. Bagnaia, P. Bahmani, M. Bahner, D. Bai, K. Baines, J.T. Baines, L. Baker, O.K. Bakos, E. Bakshi Gupta, D. Balakrishnan, V. Balasubramanian, R. Baldin, E.M. Balek, P. Ballabene, E. CPPM Aix-Marseille Université CNRS IN2P3 Marseille France Department for Physics and Technology University of Bergen Bergen Norway Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman OK United States New York University Abu Dhabi Abu Dhabi United Arab Emirates II. Physikalisches Institut Georg-August-Universität Göttingen Göttingen Germany Fakultät Physik Technische Universität Dortmund Dortmund Germany Physics Department Brookhaven National Laboratory Upton NY United States Physics Department Southern Methodist University Dallas TX United States Faculté des sciences Université Mohammed V Rabat Morocco Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion Israel Institute of Technology Haifa Israel Department of Physics New York University New York NY United States INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy Department of Physics King's College London London United Kingdom Kirchhoff-Institut für Physik Ruprecht-Karls-Universität Heidelberg Heidelberg Germany LAPP Université Savoie Mont Blanc CNRS IN2P3 Annecy France AGH University of Krakow Faculty of Physics and Applied Computer Science Krakow Poland Department of Physics Brandeis University Waltham MA United States School of Physics and Astronomy University of Manchester Manchester United Kingdom Department of Physics Northern Illinois University DeKalb IL United States Department of Physics Istanbul University Istanbul Turkey Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz CA United States Enrico Fermi Institute University of Chicago Chicago IL United States Institut de Física d'Altes Energies (IFAE) Barcelona Institute of Science and Technology Barcelona Spain INFN Sezione di Pavia Italy Dipartimento di Fisica Uni

A summary of precision measurements sensitive to electroweak, QCD and quark-flavour effects performed by the ATLAS Collaboration at the Large Hadron Collider is reported. The measurements are predominantly performed on proton–proton (pp) collision data recorded at a centre-of-mass energy of 13 TeV taken from 2015 to 2018, with an integrated luminosity of up to 140 fb⁻¹, with some results based on pp and Pb+Pb data recorded at lower nucleon centre-of-mass energies. The results cover a wide range of topics, from strong production of particles at low energies and the spectroscopy of hadrons to perturbative QCD with hadronic jets and electroweak and strong production of single and multiple vector bosons. They provide precise measurements of fundamental constants and stringent tests of the Standard Model with unprecedented precision and in energy ranges never explored before. They are also used to explore the proton structure and to perform model-independent searches for new physics. © 2024 CERN for the benefit of the ATLAS Collaboration

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A search for bursts at 0.1 PeV with a small air shower array 37

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A search for bursts at 0.1 PeV with a small air shower array

37th International Cosmic Ray Conference, ICRC 2021

作者： Clay, Roger Singh, Jassimar Sushchov, Oleksandr Homola, Piotr Alvarez Castillo, David E. Beznosko, Dmitriy Budnev, Nikolai Gora, Dariusz Gupta, Alok C. Hnatyk, Bohdan Kasztelan, Marcin Kovacs, Peter Lozowski, Bartosz Medvedev, Mikhail V. Miszczyk, Justyna Mozgova, Alona Nazari, Vahab Niedzwiecki, Michael Pawlik, Maciej Rosas, Matias Rzecki, Krzyztof Smelcerz, Katarzyna Smolek, Karel Stasielak, Jaroslaw Stuglik, Slawomir Svanidze, Manana Tursunov, Arman Verbetsky, Yuri Wibig, Tadeus Zamora-Saa, Jilberto Singh, Jassimar University of Adelaide North Terrace Adelaide Australia Institute of Nuclear Physics Polish Academy of Sciences Radzikowskiego 152 Krakow31-342 Poland Joint Institute for Nuclear research Dubna141980 Russia Clayton State University MorrowGA United States Irkutsk State University Russia Manora Park Nainital263001 India Astronomical Observatory of Taras Shevchenko National University of Kyiv Kyiv04053 Ukraine National Centre for Nuclear research Andrzeja Soltana 7 Swierk Otwock05-400 Poland Institute for Particle and Nuclear Physics Wigner centre for Physics 1121 Konkoly-Thege.Miklosut Budapest29-33 Hungary Faculty of Natural Sciences University of Silesia in Katowice Bankowa 9 Katowice40-007 Poland Department of Physics and Astronomy University of Kansas LawrenceKS66045 United States Laboratory for Nuclear Science Massachusetts Institute of Technology CambridgeMA02139 United States Department of Computer Science Faculty of Computer Science and Telecommunications Crakow University of Technology Warszawaska 24 Krakow31-155 Poland ACC Cyfronet AGH-UST Krakow30-950 Poland Liceo 6 Francisco Bauza Montivideo Uruguay Institute of Experimental and Applied Physics Czech Technical Univrsity in Prague Czech Republic E. Andronikashvili Institute under Tbilisi State University Georgia United States Research Centre for Theoretical Physics and astrophysics Institute of Physics Silesian University in Opava Bezrucovo nam. 13 OpavaCZ-74601 Czech Republic University of Lodz Faculty of Physics and Applied Informatics Pomorska 149/153 Lodz90-236 Poland Universidada Andres Bello Departmento de Ciencias Fisicas Facultad de Ciences Exactas Avenida Republica 498 Santiago Chile Department of Physics University of Adelaide North Terrace Adelaide Australia

The Cosmic Ray Extremely Distributed Observatory (CREDO) pursues a global research strategy dedicated to the search for correlated cosmic rays, so-called Cosmic Ray Ensembles (CRE). Its general approach to CRE detection does not involve any a priori considerations and the search strategy encompasses both spatial and temporal correlations, on different scales. Here we search for time clustering of the cosmic ray events collected with a small sea-level air shower array at the University of Adelaide. The array consists of seven one square metre scintillators enclosing an area of 10 m x 19 m. It has a threshold energy ~0.1 PeV, and records cosmic ray showers at a rate of ~6 mHz. We have examined event times over a period of almost two years (~294k events) to determine the event time spacing distributions between individual events and the distributions of time periods which contained specific numbers of multiple events. We find that the overall time distributions are as expected for random events. The distribution which was chosen a priori for particular study was for time periods covering five events (four spacings). Overall, this fits closely with expectation but has two outliers of short ‘burst’ periods. One of these outliers contains eight events within 48 seconds. The physical characteristics of the array will be discussed together with the analysis procedure, including a fit between the observed time distributions and expectation based on randomly arriving events. © Copyright owned by the author(s).

关键词： Cosmic rays

RECOMED: A Comprehensive Pharmaceutical Recommendation System

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arXiv 2022年

作者： Zomorodi, Mariam Ghodsollahee, Ismail Martin, Jennifer H. Talley, Nicholas J. Salari, Vahid Plawiak, Pawel Rahimi, Kazem Acharya, U. Rajendra Department of Computer Science Faculty of Computer Science and Telecommunications Cracow University of Technology Krakow Poland Department of Computer Engineering Ferdowsi University of Mashhad Iran The University of Newcastle CallaghanNSW Australia Institute for Quantum Science and Technology Department of Physics and Astronomy University of Calgary Alberta Canada Institute of Theoretical and Applied Informatics Polish Academy of Sciences Gliwice Poland Deep Medicine Nuffield Department of Women’s and Reproductive Health University of Oxford Oxford United Kingdom School of Mathematics Physics and Computing University of Southern Queensland ToowoombaQLD Australia

OBJECTIVES: To build datasets containing useful information from drug databases and recommend a list of drugs to physicians and patients with high accuracy by considering features of a spectrum of people, diseases, and chemicals. METHODS: A comprehensive pharmaceutical recommendation system was designed based on the features of a spectrum of people, diseases, and medicines extracted from two major drug databases, a dataset of patients and drug information. Then the recommendation was given, and the response was analysed using patient and caregiver ratings and the knowledge obtained from drug specifications and interactions. Sentiment analysis was employed by natural language processing approaches in pre-processing, along with neural network-based methods and recommender system algorithms for modelling the system. Patient conditions and medicine features were used for making two models based on matrix factorisation. Then we used drug interaction criteria to filter drugs with severe or mild interactions with other drugs. We developed a deep learning model for recommending drugs by using data from 2304 patients as a training set, and then we used data from 660 patients as our validation set. We used knowledge from critical drug information and combined the model’s outcome into a knowledge-based system with the rules obtained from constraints on taking medicine. RESULTS: The results show that our recommendation system can recommend an acceptable combination of medicines according to the existing real-life prescriptions available. Compared with conventional matrix factorisation, our proposed model improves the accuracy, sensitivity, and hit rate by 26%, 34%, and 40%, respectively. In addition, it improves the accuracy, sensitivity, and hit rate by an average of 31%, 29%, and 28% compared to other machine learning methods. We have open-sourced our implementation in Python. CONCLUSION: Compared to conventional machine learning approaches, we obtained average accuracy, sens

关键词： Recommender systems

Machine classification for probe-based quantum thermometry

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Physical Review A 2022年第2期105卷 022413-022413页

作者： Fabrício S. Luiz A. de Oliveira Junior Felipe F. Fanchini Gabriel T. Landi Faculdade de Ciłncias UNESP - Universidade Estadual Paulista 17033-360 Bauru São Paulo Brazil Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University 30-348 Kraków Poland Instituto de Física da Universidade de São Paulo 05314-970 São Paulo Brazil

We consider probe-based quantum thermometry and show that machine classification can provide model-independent estimation with quantifiable error assessment. Our approach is based on the k-nearest-neighbor algorithm. The machine is trained using data from either computer simulations or a calibration experiment. This yields a predictor which can be used to estimate the temperature from new observations. The algorithm is highly flexible and works with any kind of probe observable. It also allows one to incorporate experimental errors, as well as uncertainties about experimental parameters. We illustrate our method with an impurity thermometer in a Bose gas, as well as in the estimation of the thermal phonon number in the Rabi model.

关键词： Quantum metrology Thermodynamics Jaynes-Cummings model

Stochastic dynamics with multiplicative dichotomic noise: heterogeneous telegrapher's equation, anomalous crossovers and resetting

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arXiv 2022年

作者： Sandev, Trifce Kocarev, Ljupco Metzler, Ralf Chechkin, Aleksei Research Center for Computer Science and Information Technologies Macedonian Academy of Sciences and Arts Bul. Krste Misirkov 2 Skopje1000 Macedonia Institute of Physics & Astronomy University of Potsdam Potsdam-GolmD-14776 Germany Institute of Physics Faculty of Natural Sciences and Mathematics Ss. Cyril and Methodius University Arhimedova 3 Skopje1000 Macedonia Faculty of Computer Science and Engineering Ss. Cyril and Methodius University PO Box 393 Skopje1000 Macedonia Asia Pacific Center for Theoretical Physics Pohang37673 Korea Republic of Faculty of Pure and Applied Mathematics Hugo Steinhaus Center Wroclaw University of Science and Technology Wyspianskiego 27 Wroclaw50-370 Poland Akhiezer Institute for Theoretical Physics National Science Center Kharkiv Institute of Physics and Technology Akademichna 1 Kharkiv61108 Ukraine

We analyze diffusion processes with finite propagation speed in a non-homogeneous medium in terms of the heterogeneous telegrapher’s equation. In the diffusion limit of infinite-velocity propagation we recover the results for the heterogeneous diffusion process. The heterogeneous telegrapher’s process exhibits a rich variety of diffusion regimes including hyperdiffusion, ballistic motion, superdiffusion, normal diffusion and subdiffusion, and different crossover dynamics characteristic for complex systems in which anomalous diffusion is observed. The anomalous diffusion exponent in the short time limit is twice the exponent in the long time limit, in accordance to the crossover dynamics from ballistic diffusion to normal diffusion in the standard telegrapher’s process. We also analyze the finite-velocity heterogeneous diffusion process in presence of stochastic Poissonian resetting. We show that the system reaches a non-equilibrium stationary state. The transition to this non-equilibrium steady state is analysed in terms of the large deviation function. © 2022, CC BY.

关键词： Diffusion

Orthonormal bases of extreme quantumness

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arXiv 2023年

作者： Rudziński, Marcin Burchardt, Adam Życzkowski, Karol Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University ul. Lojasiewicza 11 Kraków30-348 Poland Doctoral School of Exact and Natural Sciences Jagiellonian University ul. Lojasiewicza 11 Kraków30-348 Poland QuSoft CWI University of Amsterdam Science Park 123 Amsterdam1098 XG Netherlands Center for Theoretical Physics Polish Academy of Sciences Al. Lotników 32/46 Warszawa02-668 Poland

Spin anticoherent states acquired recently a lot of attention as the most "quantum" states. Some coherent and anticoherent spin states are known as optimal quantum rotosensors. In this work, we introduce a measure of quantumness for orthonormal bases of spin states, determined by the average anticoherence of individual vectors and the Wehrl entropy. In this way, we identify the most coherent and most quantum states, which lead to orthogonal measurements of extreme quantumness. Their symmetries can be revealed using the Majorana stellar representation, which provides an intuitive geometrical representation of a pure state by points on a sphere. Results obtained lead to maximally (minimally) entangled bases in the 2j + 1 dimensional symmetric subspace of the 22j dimensional space of states of multipartite systems composed of 2j qubits. Some bases found are iso-coherent as they consist of all states of the same degree of spin-coherence. © 2023, CC BY-SA.

关键词： Quantum entanglement

Sawtooth lattice multiferroic BeCr2O4: Non-collinear magnetic structure and multiple magnetic transitions

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arXiv 2023年

作者： Mandujano, Hector Cein Metta, Alejandro Barišić, Neven Zhang, Qiang Tabis, Wojciech Muniraju, Naveen Kumar Chogondahalli Nair, Harikrishnan S. Department of Physics University of Texas 500 W University Ave El PasoTX79968 United States Department of Chemistry University of Texas 500 W University Ave El PasoTX79968 United States Institute of Solid State Physics Vienna University of Technology Wiedner Hauptstrße 8–10 Vienna1040 Austria Department of Physics Faculty of Science University of Zagreb Bijenička cesta 32 Zagreb10000 Croatia Neutron Scattering Division Oak Ridge National Laboratory Oak RidgeTN37830 United States AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow30-059 Poland The Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences 152 Radzikowskiego Str. Krakow31-342 Poland Institute of Physics Bijenička cesta 46 ZagrebHR-10000 Croatia

Noncollinear magnetic structures and multiple magnetic phase transitions in a sawtooth lattice antiferromagnet consisting of Cr3+ are experimentally identified in this work, thereby proposing the scenario of magnetism-driven ferroelectricity in a sawtooth lattice. The title compound, BeCr2O4, displays three magnetic phase transitions at low temperatures, at TN1 ≈ 7.5 K, at TN2 ≈ 25 K and at TN3 ≈ 26 K, revealed through magnetic susceptibility, specific heat and neutron diffraction in this work. These magnetic phase transitions are found to be influenced by externally applied magnetic fields. Isothermal magnetization curves at low temperatures below the magnetic transitions indicate the antiferromagnetic nature of BeCr2O4 with two spin-flop-like transitions occurring at Hc1 ≈ 29 kOe and Hc2 ≈ 47 kOe. Our high-resolution X-ray and neutron diffraction studies, performed on single crystal and powder samples unambiguously determined the crystal structure as orthorhombic Pbnm. By performing the magnetic superspace group analysis of the neutron diffraction data at low temperatures, the magnetic structure in the temperature range TN3,N2 N1 is determined to be the polar magnetic space group, P21nm.10(00g)0s0s with a cycloidal magnetic propagation vector k1 = (0, 0, 0.090(1)). The magnetic structure in the newly identified phase below TN1, is determined as P21/b.10[b](00g)00s with the magnetic propagation vector k2 = (0, 0, 0.908(1)). The cycloidal spin structure determined in our work is usually associated with electric polarization, thereby making BeCr2O4 a promising multiferroic belonging to the sparsely populated family of sawtooth lattice antiferromagnets. © 2023, CC BY.

关键词： Magnetic structure

MgPd2Sb: A Mg-based Heusler-type superconductor

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Physical Review B 2021年第21期103卷 214501-214501页

作者： M. J. Winiarski G. Kuderowicz K. Górnicka L. S. Litzbarski K. Stolecka B. Wiendlocha R. J. Cava T. Klimczuk Faculty of Applied Physics and Mathematics Gdansk University of Technology ulica Narutowicza 11/12 80-233 Gdansk Poland Advanced Materials Centre Gdansk University of Technology ulica Narutowicza 11/12 80-233 Gdańsk Poland Faculty of Physics and Applied Computer Science AGH University of Science and Technology Aleja Mickiewicza 30 30-059 Kraków Poland Department of Chemistry Princeton University Princeton New Jersey 08544 USA

We report the synthesis and physical properties of a full Heusler compound, MgPd2Sb, which we found to show superconductivity below Tc=2.2K. MgPd2Sb was obtained by a two-step solid-state reaction method and its purity and cubic crystal structure [Fm−3m, a=6.4523(1)Å] were confirmed by powder x-ray diffraction. Normal and superconducting states were studied by electrical resistivity, magnetic susceptibility, and heat capacity measurements. The results show that MgPd2Sb is a type-II, weak coupling superconductor (λe−p=0.53). The observed pressure dependence of Tc (ΔTc/p≈–0.23K/GPa) is one of the strongest reported for a superconducting Heusler compound. The electronic structure, phonons, and electron-phonon coupling in MgPd2Sb were theoretically investigated. The obtained results are in agreement with the experiment, confirming the electron-phonon coupling mechanism of superconductivity. We compare the superconducting parameters to those of all reported Heusler-type superconductors.

关键词： Electron-phonon coupling Phonons Superconductivity Heusler alloy Density functional calculations Resistivity measurements Specific heat measurements