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Your search keyword '"Oleg Ruchayskiy"' showing total 6 results
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6 results on '"Oleg Ruchayskiy"'

1. Constraints on the parameters of the neutrino extension of the Standard Model

Author

Volodymyr Gorkavenko, Oleksandr Khasai, Oleg Ruchayskiy, and Mariia Tsarenkova

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract Heavy neutral leptons (HNLs) are hypothetical particles proposed as a potential explanation for neutrino oscillations and the generation of the baryon asymmetry in the Universe. This paper focuses on HNLs with masses significantly above the electroweak scale. It is challenging to test for the presence of such particles directly. However, they leave behind effective interactions of Standard Model particles, leading in particular to charged lepton flavor violation (cLFV) processes. Non-observation of cLFV processes puts therefore constraints on the parameters of the HNLs. In this paper, we find the relations between the effective operators in the realistic case when neutrino masses are non-zero and the HNLs are non-degenerate. This allows us to strengthen the existing cLFV constraints on the tau-flavors from much stronger constraints on muon and electron flavors. We also link the baryon asymmetry of the Universe to the same higher-dimensional effective operators, providing complementary bounds on these parameters.

Published
2025
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2. Heavy neutral leptons — Advancing into the PeV domain

Author

Kevin A. Urquía-Calderón, Inar Timiryasov, and Oleg Ruchayskiy

Subjects
Lepton Flavour Violation (charged), Sterile or Heavy Neutrinos, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract Heavy neutral leptons (HNLs) are hypothetical particles able to explain neutrino oscillations and provide a mechanism for generating the baryon asymmetry of the Universe. Quantum corrections due to such particles give rise to flavor violating processes in the charged lepton sector. Based on the fact that these corrections grow with HNL masses, we improve existing constraints by orders of magnitude in mass and mixing angle. This allows us to probe part of the parameter space of leptogenesis with multi-TeV HNLs. We also show that one will be able to infer HNL parameters in a significant portion of the parameter space for TeV-PeV masses if charged lepton flavor violating signals are detected.

Published
2023
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4. Results and Perspectives from the First Two Years of Neutrino Physics at the LHC by the SND@LHC Experiment.

Author

Duccio Abbaneo, Shakeel Ahmad, Raffaele Albanese, Andrey Alexandrov, Fabio Alicante, Konstantin Androsov, Anna Anokhina, Takashi Asada, Chayanit Asawatangtrakuldee, Marco A. Ayala Torres, Carlo Battilana, Aurelio Bay, Alcide Bertocco, Christopher Betancourt, Daniel Bick, Riddhi Biswas, Alberto Blanco Castro, Vincenzo Boccia, Mariyan Bogomilov, Daniele Bonacorsi, Walter Bonivento, Paula Bordalo, Alexey Boyarsky, Salvatore Buontempo, Mario Campanelli, TizianoCamporesi, Vincenzo Canale, Andrea Castro, Daniele Centanni, Francesco Cerutti, Mikhail Chernyavskiy, Ki Young Choi, Serhii Cholak, Federico Cindolo, Matei Climescu, Andrew Conaboy, Gaetano Marco Dallavalle, Daniele Davino, Paul de Bryas, Giovanni De Lellis, Massimiliano de Magistris, Albert De Roeck, Alvaro De Rújula, Marilisa De Serio, Dario De Simone, Antonia Di Crescenzo, Donato Di Ferdinando, Roberto Donà, Onur Durhan, Fabrizio Fabbri, Filips Fedotovs, Martina Ferrillo, Massimiliano Ferro-Luzzi, Rosa Anna Fini, Antimo Fiorillo, Raffaele Fresa, Wolfgang Funk, Francisca M. Garay Walls, Artem Golovatiuk, Andrey Golutvin, Elena Graverini, Ali M. Guler, Vasilisa Guliaeva, Guido J. Haefeli, Caren Hagner, Juan C. Helo Herrera, Eric van Herwijnen, Paolo Iengo, Simona Ilieva, Angelo Infantino, Antonio Iuliano, Richard Jacobsson, Cagin Kamiscioglu, Anni M. Kauniskangas, Emil Khalikov, Sung Hyun Kim, Yeong Gyun Kim, Guennadii Klioutchnikov, Masahiro Komatsu, Nina Konovalova, Sergey Kuleshov, Lukasz Krzempek, Heiko M. Lacker, Oliver Lantwin, Federico Lasagni Manghi, Adele Lauria, Kang Young Lee, Kyong Sei Lee, Sergio Lo Meo, Vincenzo Paolo Loschiavo, Stefano Marcellini, Annarita Margiotta, Anna Mascellani, Filippo Mei, Andrea Miano, A. Mikulenko, Maria Cristina Montesi, Francesco Luigi Navarria, Waraporn Nuntiyakul, Satoru Ogawa, Natalia Okateva, Maksym Ovchynnikov, Giulia Paggi, Byungdo Park, Alessandra Pastore, Andrea Perrotta, Dmitriy Podgrudkov, Natalia Polukhina, Andrea Prota, Antonio Quercia, Sérgio Ramos, Anupama Reghunath, Tatiana Roganova, Federico Ronchetti, Tiziano Rovelli, Oleg Ruchayskiy, Thomas Ruf, Marta Sabate Gilarte, Zhakypbek Sadykov, Mikhail Samoilov, Valentino Scalera, Walter Schmidt-Parzefall, Olivier Schneider, Givi Sekhniaidze, Nicola Serra, Mikhail Shaposhnikov, Vladimir Shevchenko, Tatiana Shchedrina, Lesya Shchutska, Hiroshi Shibuya, Saverio Simone, Gian P. Siroli, Gabriele Sirri, Guilherme Soares, Jong Yoon Sohn, Orlando J. Soto Sandoval, Maurizio Spurio, Nikolai Starkov, Jan Steggemann, Inar Timiryasov, Valeri Tioukov, Francesco Tramontano, Carina Trippl, Eduard Ursov, Andrey Ustyuzhanin, Galina Vankova-Kirilova, Gerardo Vasquez, Vassil Verguilov, Nuno Viegas Guerreiro Leonardo, Cristovao Vilela, Ciro Visone, Rainer Wanke, Eda Yaman, Zhibin Yang, Ceren Yazici, Chun Sil Yoon, Ettore Zaffaroni, and Jilberto Zamora-Saá

Published
2024
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5. Resonance production of keV sterile neutrinos in core-collapse supernovae and lepton number diffusion

Author

Vsevolod Syvolap, Oleg Ruchayskiy, and Alexey Boyarsky

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), INERT NEUTRINOS, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Astrophysics::High Energy Astrophysical Phenomena, BOUNDS, High Energy Physics::Phenomenology, PROGENITOR, FOS: Physical sciences, EQUATION-OF-STATE, EVOLUTION, SIMULATIONS, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), DARK-MATTER, OSCILLATIONS, AXIONS, NEUTRON-STAR, High Energy Physics::Experiment, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We investigate how hypothetical particles - sterile neutrinos - can be produced in the interior of exploding supernovae via the resonant conversion of $\bar\nu_\mu$ and $\bar \nu_\tau$. The novelty of our treatment lies in the proper account of the resulting lepton number diffusion. We compute the yield of sterile neutrinos and find that even after taking into account back reaction, sterile neutrinos can carry out a sizeable fraction of the total energy of the explosion comparable to that of active neutrinos. The production is, however, exponentially sensitive to the temperature in the inner supernovae regions, making robust predictions of challenging. In order to understand whether this production affects supernova evolution and can therefore be constrained, detailed simulations including the effects of sterile neutrinos are needed., Comment: 9 pages + Appendices, 13 figures

Published
2022
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6. The Present and Future Status of Heavy Neutral Leptons

Author

Asli M Abdullahi, Pablo Barham Alzás, Brian Batell, James Beacham, Alexey Boyarsky, Saneli Carbajal, Animesh Chatterjee, José I Crespo-Anadón, Frank F Deppisch, Albert De Roeck, Marco Drewes, Alberto Martin Gago, Rebeca Gonzalez Suarez, Evgueni Goudzovski, Athanasios Hatzikoutelis, Josu Hernandez-Garcia, Matheus Hostert, Marco Hufnagel, Philip Ilten, Alexander Izmaylov, Kevin J Kelly, Juraj Klarić, Joachim Kopp, Suchita Kulkarni, Mathieu Lamoureux, Gaia Lanfranchi, Jacobo López-Pavón, Oleksii Mikulenko, Michael Mooney, Miha Nemevšek, Maksym Ovchynnikov, Silvia Pascoli, Ryan Plestid, Mohamed Rashad Darwish, Federico Leo Redi, Oleg Ruchayskiy, Richard Ruiz, Mikhail Shaposhnikov, Lesya Shchutska, Ian M Shoemaker, Robert Shrock, Alex Sousa, Nick Van Remortel, Vsevolod Syvolap, Volodymyr Takhistov, Jean-Loup Tastet, Inar Timiryasov, Aaron C Vincent, Jaehoon Yu, and UAM. Departamento de Física Teórica

Subjects
Nuclear and High Energy Physics, STERILE NEUTRINO, PROTON-PROTON COLLISIONS, FOS: Physical sciences, beyond the standard model, WARM DARK-MATTER, High Energy Physics - Experiment, Subatomär fysik, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), sterile neutrinos, Subatomic Physics, Neutrinos, Particle Physics - Phenomenology, RESONANT CP VIOLATION, LEFT-RIGHT SYMMETRY, hep-ex, Physics, Física, hep-ph, LYMAN-ALPHA FOREST, Sterile Neutrinos, High Energy Physics - Phenomenology, Beyond the Standard Model, PROCESSES INVOLVING NEUTRINOS, 3.5 KEV LINE, DOUBLE-BETA DECAY, Particle Physics - Experiment, BARYON-NUMBER NONCONSERVATION
Abstract

Artículo escrito por un elevado número de autores, solo se referencian el que aparece en primer lugar, los autores pertenecientes a la UAM y el nombre del grupo de colaboración, si lo hubiere, The existence of nonzero neutrino masses points to the likely existence of multiple Standard Model neutral fermions. When such states are heavy enough that they cannot be produced in oscillations, they are referred to as heavy neutral leptons (HNLs). In this white paper, we discuss the present experimental status of HNLs including colliders, beta decay, accelerators, as well as astrophysical and cosmological impacts. We discuss the importance of continuing to search for HNLs, and its potential impact on our understanding of key fundamental questions, and additionally we outline the future prospects for next-generation future experiments or upcoming accelerator run scenarios

Published
2022
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