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Fast simulation of the LHCb electromagnetic calorimeter response using VAEs and GANs
Journal of Physics: Conference Series. 2021. No. 1740. Article 012028.
Modern experiments in high-energy physics require an increasing amount of simulated data. Monte-Carlo simulation of calorimeter responses is by far the most computationally expensive part of such simulations. Recent works have shown that the application of generative neural networks to this task can significantly speed up the simulations while maintaining an appropriate degree of accuracy. This paper explores different approaches to designing and training generative neural networks for simulation of the electromagnetic calorimeter response in the LHCb experiment.
Ratnikov F., EPJ Web of Conferences 2020 Vol. 245 P. 2026-2033
LHCb is one of the major experiments operating at the Large Hadron Collider at CERN. The richness of the physics program and the increasing precision of the measurements in LHCb lead to the need of ever larger simulated samples. This need will increase further when the upgraded LHCb detector will start collecting data in the ...
Added: February 4, 2021
Derkach D., Hushchyn M., Kazeev N. et al., Journal of High Energy Physics 2019 Vol. 6 P. 1-27
The first untagged decay-time-integrated amplitude analysis of Bs0 → KS0K±π∓ decays is performed using a sample corresponding to 3.0 fb−1 of pp collision data recorded with the LHCb detector during 2011 and 2012. The data are described with an amplitude model that contains contributions from the intermediate resonances K*(892)0,+, K2*(1430)0,+ and K0*(1430)0,+, and their charge conjugates. Measurements of the branching fractions of the decay modes Bs0 → K*(892)±K∓ and 𝐵0𝑠→𝐾∗(---)(892)0𝐾0(---)Bs0→K∗(---)(892)0K0(---) are in ...
Added: March 16, 2020
Derkach D., Hushchyn M., Kazeev N. et al., Physical Review Letters 2019 Vol. 123 No. 3 P. 1-11
The radiative decay Λ0b→Λγ is observed for the first time using a data sample of proton-proton collisions corresponding to an integrated luminosity of 1.7 fb−1 collected by the LHCb experiment at a center-of-mass energy of 13 TeV. Its branching fraction is measured exploiting the B0→K*0γ decay as a normalization mode and is found to be B(Λ0b→Λγ)=(7.1±1.5±0.6±0.7)×10−6, where the quoted uncertainties are statistical, systematic, and ...
Added: March 16, 2020
Ratnikov F., Journal of Instrumentation 2020 Vol. 15 No. 5 Article 05032
Design of new experiments, as well as upgrade of ongoing ones, is a continuous process in the experimental high energy physics. Frontier R&Ds; are used to squeeze the maximum physics performance using cutting edge detector technologies. The evaluation of physics performance for particular configuration includes sketching this configuration in Geant, simulating typical signals and backgrounds, ...
Added: February 4, 2021
Ratnikov F., The European Physical Journal C - Particles and Fields 2018 Vol. 78 No. 12 P. 1-12
A search is presented for a Higgs-like boson with mass in the range 45 to 195 GeV/𝑐2GeV/c2 decaying into a muon and a tau lepton. The dataset consists of proton-proton interactions at a centre-of-mass energy of 8 TeV TeV , collected by the LHCb experiment, corresponding to an integrated luminosity of 2 fb −1 fb −1 . The tau leptons are reconstructed in both leptonic ...
Added: March 10, 2019
Aaij R., Arzymatov K., Baranov A. et al., The European Physical Journal C - Particles and Fields 2020 Vol. 80 Article 986
A first search for CPCP violation in the Cabibbo-suppressed Ξ+c→pK−π+Ξc+→pK−π+ decay is performed using both a binned and an unbinned model-independent technique in the Dalitz plot. The studies are based on a sample of proton-proton collision data, corresponding to an integrated luminosity of 3.0fb−13.0fb−1, and collected by the LHCb experiment at centre-of-mass energies of 7 and 8TeV8TeV. The data are consistent ...
Added: December 7, 2020
Ratnikov F., Journal of High Energy Physics 2018 Vol. 1811 P. 1-35
The production of ϒ(nS) mesons (n = 1, 2, 3) in pPb and Pbp collisions at a centre-of-mass energy per nucleon pair 𝑠NN‾‾‾‾√=8.16sNN=8.16 TeV is measured by the LHCb experiment, using a data sample corresponding to an integrated luminosity of 31.8 nb−1−1. The ϒ(nS) mesons are reconstructed through their decays into two opposite-sign muons. The measurements comprise ...
Added: March 11, 2019
Salibekyan S. M., Панфилов П. Б., Информационные технологии и вычислительные системы 2013 № 1 С. 3-10
Simulating principles of proposed attribute (A) and object-attribute (OA) architectures of computer systems (CS) that implement the dataflow execution model, and the results of a dataflow-supercomputer system simulation are described. A new formalism of "Attribute Nets" (A-nets) is proposed for mathematical modeling of dataflow-CS that differs significantly from apparatus of Petri Nets. This formalism lays ...
Added: June 9, 2013
Borisyak M., Belous M., Derkach D. et al., Journal of Instrumentation 2017
High-energy physics experiments rely on reconstruction of the trajectories of particles produced at the interaction point. This is a challenging task, especially in the high track multiplicity environment generated by p-p collisions at the LHC energies. A typical event includes hundreds of signal examples (interesting decays) and a significant amount of noise (uninteresting examples). This ...
Added: October 18, 2017
Ratnikov F., Viktoria Chekalina, Journal of Physics: Conference Series 2018 Vol. 1085 P. 1-5
Reconstruction and identification of particles in calorimeters of modern High Energy Physics experiments is a complicated task. Solutions are usually driven by a priori knowledge about expected properties of reconstructed objects. Such an approach is also used to distinguish single photons in the electromagnetic calorimeter of the LHCb detector at the LHC from overlapping photons ...
Added: October 18, 2018
Borisyak M., Ustyuzhanin A., Derkach D. et al., Journal of Physics: Conference Series 2017 No. 898 P. 1-7
High-energy physics experiments rely on reconstruction of the trajectories of particles produced at the interaction point. This is a challenging task, especially in the high track multiplicity environment generated by p-p collisions at the LHC energies. A typical event includes hundreds of signal examples (interesting decays) and a significant amount of noise (uninteresting examples). This ...
Added: June 16, 2017
Domoratsky E., М. : Финансовый университет при Правительстве РФ, 2015
The workshop is intended for the acquisition of practical skills of computer simulation and study of the functional components and devices of microcomputers using circuit simulation program "Electronic Workbench" students of higher and secondary educational institutions, students of architecture, organization, circuitry and computer modeling of digital components and devices of the computer. ...
Added: February 9, 2014
Hushchyn M., Ustyuzhanin A., Derkach D. et al., Physics Letters B 2017 Vol. 767 P. 177-187
A measurement of the time-integrated CP asymmetry in the Cabibbo-suppressed decay D0→K−K+ is performed using pp collision data, corresponding to an integrated luminosity of 3fb−1, collected with the LHCb detector at centre-of-mass energies of 7 and 8 TeV. The flavour of the charm meson at production is determined from the charge of the pion in ⁎D⁎+→D0π+ and ⁎D⁎−→D‾0π− decays. The time-integrated CP asymmetry ACP(K−K+) is obtained assuming negligible CP violation in charm ...
Added: January 30, 2018
Hushchyn M., Derkach D., Ustyuzhanin A. et al., Physics Letters B 2018 Vol. 777 P. 16-30
Measurements of CP observables in B±→D(⁎)K± and B±→D(⁎)π± decays are presented, where D(⁎) indicates a neutral D or D⁎ meson that is an admixture of D(⁎)0 and D¯(⁎)0states. Decays of the D⁎ meson to the Dπ0 and Dγ final states are partially reconstructed without inclusion of the neutral pion or photon, resulting in distinctive shapes in the Bcandidate invariant mass distribution. Decays of the D meson are fully reconstructed in the K±π∓, K+K− and π+π− final states. The analysis uses a sample of charged B mesons ...
Added: January 30, 2018
Ometov A., Жиданов К. А., Беззатеев С. В. et al., Научно-технические ведомости Санкт-Петербургского государственного политехнического университета. Информатика. Телекоммуникации. Управление 2019 Т. 12 № 3 С. 58-66
Повсеместные исследования в области беспроводной связи предлагают огромный спектр технологических инструментов для потенциального натурного моделирования и интеграции. Одно из перспективных направлений в данной области – применение прямых соединений между мобильными узлами в географической близости (D2D). В статье проанализированы коммуникационные сценарии, возникающие в сетях связи пятого поколения с использованием прямых D2D соединений между пользовательскими мобильными узлами. Предложен ...
Added: October 31, 2019
Trubochkina N. K., Качество. Инновации. Образование 2014 № 9 С. 43-53
Approach to creating a memory array constructed on two different algorithms to provide basic memory - R-trigger in transition circuitry is described. The results of a successful computer simulations for two one-layer nanostructures for memory arrays with high information density are given. The fundamental importance is the implementation of a single-layer nanostructures storage elements, which ...
Added: March 2, 2015
Polykovskiy D., Zhebrak A., Sanchez-Lengeling B. et al., Frontiers in Pharmacology 2020 Vol. 11 P. 1-10
Generative models are becoming a tool of choice for exploring the molecular space. These models learn on a large training dataset and produce novel molecular structures with similar properties. Generated structures can be utilized for virtual screening or training semi-supervized predictive models in the downstream tasks. While there are plenty of generative models, it is ...
Added: April 21, 2021
Ratnikov F., Journal of High Energy Physics 2018 Vol. 1808 P. 1-19
The 𝐵0𝑠⎯⎯⎯⎯⎯⎯⎯→𝜒𝑐2𝐾+𝐾−Bs0¯→χc2K+K− decay mode is observed and its branching fraction relative to the corresponding 𝜒𝑐1χc1decay mode, in a ±15MeV/𝑐2±15MeV/c2 window around the 𝜙ϕ mass, is found to be (𝐵0𝑠⎯⎯⎯⎯⎯⎯⎯→𝜒𝑐2𝐾+𝐾−)(𝐵0𝑠⎯⎯⎯⎯⎯⎯⎯→𝜒𝑐1𝐾+𝐾−)=(17.1±3.1±0.4±0.9)%,B(Bs0¯→χc2K+K−)B(Bs0¯→χc1K+K−)=(17.1±3.1±0.4±0.9)%, where the first uncertainty is statistical, the second systematic and the third due to the knowledge of the branching fractions of radiative 𝜒𝑐χc decays. The decay mode 𝐵0𝑠⎯⎯⎯⎯⎯⎯⎯→𝜒𝑐1𝐾+𝐾−Bs0¯→χc1K+K− allows the 𝐵0𝑠Bs0 mass to be measured as 𝑚(𝐵0𝑠)=5366.83±0.25±0.27MeV/𝑐2,m(Bs0)=5366.83±0.25±0.27MeV/c2,where the first uncertainty is statistical ...
Added: March 11, 2019
Borisyak M., Ratnikov F., Ustyuzhanin A., Physical Review Letters 2017 Vol. 118 No. 25 P. 251802-251812
A search for the rare decays Bs0→τ+τ- and B0→τ+τ- is performed using proton–proton collision data collected with the LHCb detector. The data sample corresponds to an integrated luminosity of 3 fb-1 collected in 2011 and 2012. The τ leptons are reconstructed through the decay τ-→π-π+π-ντ. Assuming no contribution from B0→τ+τ- decays, an upper limit is set ...
Added: October 22, 2017
Ratnikov F., Баранов А. С., Borisyak M. et al., Journal of High Energy Physics 2018 Vol. 2018 P. 1-31
A flavour-tagged decay-time-dependent amplitude analysis of B s 0 → (K+π−)(K−π+) decays is presented in the K±π∓ mass range from 750 to 1600MeV/c2. The analysis uses pp collision data collected with the LHCb detector at centre-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3.0 fb−1. Several quasi-two-body decay modes are considered, corresponding to K±π∓ combinations with spin 0, 1 and 2, ...
Added: June 4, 2018
The system of predictive analysis of Bank investments using technologies of supercomputer simulation
Belov A. V., Kurmanova K., Journal of Physics: Conference Series 2021 Vol. 1740 P. 1-6
The article discusses an approach to building a system for generating a bank investment prediction with the technology of parallel computing. We develop a predictive model of the price of securities for the banking business on the stock market. For predictive analysis of investments, the choice of a mathematical model was justified using the Monte ...
Added: January 27, 2021
Ratnikov F., Physical Review Letters 2018 Vol. 121 No. 22 P. 222001-1-222001-10
The cross section for prompt antiproton production in collisions of protons with an energy of 6.5 TeV incident on helium nuclei at rest is measured with the LHCb experiment from a data set corresponding to an integrated luminosity of 0.5 nb-1. The target is provided by injecting helium gas into the LHC beam line at the LHCb ...
Added: March 11, 2019
Ustyuzhanin A., Likhomanenko T., Derkach D. et al., Journal of Instrumentation 2016 Vol. 11
A new algorithm for the determination of the initial flavour of B0 s mesons is presented. The algorithm is based on two neural networks and exploits the b hadron production mechanism at a hadron collider. The first network is trained to select charged kaons produced in association with the B0 s meson. The second network ...
Added: October 23, 2016
Kadurin A., Nikolenko S. I., Khrabrov K. et al., Molecular Pharmaceutics 2017 Vol. 14 No. 9 P. 3098-3104
Deep generative adversarial networks (GANs) are the emerging technology in drug discovery and biomarker development. In our recent work, we demonstrated a proof-of-concept of implementing deep generative adversarial autoencoder (AAE) to identify new molecular fingerprints with predefined anticancer properties. Another popular generative model is the variational autoencoder (VAE), which is based on deep neural architectures. ...
Added: March 14, 2018