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Deuteron EDM induced by CP-violating couplings of pseudoscalar mesons

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Physical Review D 2020年第11期101卷 115041-115041页

作者： Alexey S. Zhevlakov Valery E. Lyubovitskij Department of Physics Tomsk State University 634050 Tomsk Russia Matrosov Institute for System Dynamics and Control Theory SB RAS Lermontov str. 134 664033 Irkutsk Russia Institut für Theoretische Physik Universität Tübingen Kepler Center for Astro and Particle Physics Auf der Morgenstelle 14 D-72076 Tübingen Germany Departamento de Física y Centro Científico Tecnológico de Valparaíso-CCTVal Universidad Técnica Federico Santa María Casilla 110-V Valparaíso Chile

We analyze contributions to the electric dipole moment (EDM) and Schiff moment of deuteron induced by the CP-violating three-pseudoscalar meson couplings using phenomenological Lagrangian approach involving nucleons and pseudoscalar mesons P=π,K,η,η′. Deuteron is considered as a proton-neutron bound state and its properties are defined by one- and two-body forces. One-body forces correspond to a picture there; proton and neutron are quasifree constituents of deuteron and their contribution to the deuteron EDM (dEDM) is simply the sum of proton and neutron EDMs. Two-body forces in deuteron are induced by one-meson exchange between nucleons. They produce a contribution to the dEDM, which is estimated using corresponding potential approach. From numerical analysis of nucleon and deuteron EDMs, we derive stringent limits on CP-violating hadronic couplings and θ¯ parameter. We showed that proposed measurements of proton and deuteron EDMs at level of ∼10−29 by the Store Ring EDM and JEDI Collaborations will provide more stringent upper limits on the CP-violating parameters.

关键词： Electric moment Rare decays Neutrons Protons

Deuteron EDM induced by CP violating couplings of pseudoscalar mesons

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arXiv 2020年

作者： Zhevlakov, Alexey S. Lyubovitskij, Valery E. Department of Physics Tomsk State University Tomsk634050 Russia Matrosov Institute for System Dynamics and Control Theory SB RAS Lermontov str. 134 Irkutsk664033 Russia Institut für Theoretische Physik Universität Tübingen Kepler Center for Astro and Particle Physics Auf der Morgenstelle 14 TübingenD-72076 Germany Departamento de Física y Centro Científico Tecnológico de Valparaíso-CCTVal Universidad Técnica Federico Santa María Casilla 110-V Valparaíso Chile

We analyze contributions to the electric dipole (EDM) and Schiff (SFM) moments of deuteron induced by the CP-violating three-pseudoscalar meson couplings using phenomenological Lagrangian approach involving nucleons and pseudoscalar mesons P = π, K, η, η0. Deuteron is considered as a proton-neutron bound state and its properties are defined by one- and two-body forces. One-body forces correspond to a picture there proton and neutron are quasi free constituents of deuteron and their contribution to the deuteron EDM (dEDM) is simply the sum of proton and neutron EDMs. Two-body forces in deuteron are induced by one-meson exchange between nucleons. They produce a contribution to the dEDM, which is estimated using corresponding potential approach. From numerical analysis of nucleon and deuteron EDMs we derive stringent limits on CP-violating hadronic couplings and θ¯ parameter. We showed that proposed measurements of proton and deuteron EDMs at level of ∼ 10−29 by the Store Ring EDM and JEDI Collaborations will provide more stringent upper limits on the CP violating parameters. Copyright © 2020, The Authors. All rights reserved.

关键词： Deuterium

Implication of hidden sub-GeV bosons for the (g−2)μ, Be8−He4 anomaly, proton charge radius, EDM of fermions, and dark axion portal

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Physical Review D 2020年第9期102卷 095024-095024页

作者： D. V. Kirpichnikov Valery E. Lyubovitskij Alexey S. Zhevlakov Institute for Nuclear Research of the Russian Academy of Sciences 117312 Moscow Russia Institut für Theoretische Physik Universität Tübingen Kepler Center for Astro and Particle Physics Auf der Morgenstelle 14 D-72076 Tübingen Germany Departamento de Física y Centro Científico Tecnológico de Valparaíso-CCTVal Universidad Técnica Federico Santa María Casilla 110-V Valparaíso Chile Department of Physics Tomsk State University 634050 Tomsk Russia Tomsk Polytechnic University 634050 Tomsk Russia Matrosov Institute for System Dynamics and Control Theory SB RAS Lermontov street 134 664033 Irkutsk Russia

We discuss new physics phenomenology of hidden scalar (S), pseudoscalar (P), vector (V) and axial-vector (A) particles coupled to nucleons and leptons, which could give contributions to proton charge radius, (g−2)μ, Be8−He4 anomaly and electric dipole moment (EDM) of Standard Model (SM) particles. In particular, we estimate sensitivity of NA64μ experiment to observe muon missing energy events involving hidden scalar and vector particles. That analysis is based on geant4 Monte Carlo simulation of the signal process of muon scattering off target nuclei μN→μNS(V) followed by invisible boson decay into dark matter (DM) particles, S(V)→χχ. The existence of light sub-GeV bosons could possibly explain the muon (g−2) anomaly observed. We also summarize existing bounds on ATOMKI X17(JP=0−,1±) boson coupling with neutron, proton, and electron. We implement these constraints to estimate the contribution of P, V. and A particles to proton charge radius via direct 1-loop calculation of Sachs form factors. The analysis reveals the corresponding contribution is negligible. We also calculate bounds on dark axion portal couplings of dimension-five operators, which contribute to the EDMs of leptons and neutron.

关键词： Axions Composite models Electric moment Extensions of Higgs sector Extensions of gauge sector Form factors Magnetic moment Single-particle dynamics Parity Monte Carlo methods Nuclear structure & decays

Constraints on CP-odd ALP couplings from EDM limits of fermions.

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arXiv 2020年

作者： Kirpichnikov, D.V. Lyubovitskij, Valery E. Zhevlakov, Alexey S. Institute for Nuclear Research of the Russian Academy of Sciences Moscow117312 Russia Institut für Theoretische Physik Universität Tübingen Kepler Center for Astro and Particle Physics Auf der Morgenstelle 14 TübingenD-72076 Germany Departamento de Física y Centro Científico Tecnológico de Valparaíso-CCTVal Universidad Técnica Federico Santa María Casilla 110-V Valparaíso Chile Department of Physics Tomsk State University Tomsk634050 Russia Matrosov Institute for System Dynamics and Control Theory SB RAS Lermontov str. 134 Irkutsk664033 Russia

We discuss constraints on soft CP-violating couplings of axion-like particles (ALPs) with photon and fermions by using data on electric dipole moments (EDMs) of Standard Model (SM) particles. In particular, we derive bounds on CP-odd ALP-photon-photon coupling from data of the ACME Collaboration on electron EDM. We also discuss prospects of the Storage Ring experiment to constrain the ALP-photon-photon coupling from data on proton EDM. The regarding constraints from experimental bounds on the muon and neutron EDMs are weak. We set constraint on the CP-odd ALP coupling with electron and derive bounds on combinations of coupling constants, which involve soft CP-violating terms. Finally, we discuss a scenario of inducing of Yukawa-like interaction of SM fermions with ALP through the electro-weak symmetry breaking mechanism. Copyright © 2020, The Authors. All rights reserved.

关键词： Photons

Implication of the hidden sub-GeV bosons for the (g - 2)μ, 8Be-4He anomaly, proton charge radius, EDM of fermions and dark axion portal

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arXiv 2020年

作者： Kirpichnikov, D.V. Lyubovitskij, Valery E. Zhevlakov, Alexey S. Institute for Nuclear Research Russian Academy of Sciences Moscow117312 Russia Institut für Theoretische Physik Universität Tübingen Kepler Center for Astro and Particle Physics Auf der Morgenstelle 14 TübingenD-72076 Germany Departamento de Física Centro Científico Tecnológico de Valparaíso-CCTVal Universidad Técnica Federico Santa María Casilla 110-V Valparaíso Chile Department of Physics Tomsk State University Tomsk634050 Russia Matrosov Institute for System Dynamics and Control Theory SB RAS Lermontov str. 134 Irkutsk664033 Russia

We discuss new physics phenomenology of hidden scalar (S), pseudoscalar (P), vector (V ) and axial-vector (A) particles coupled to nucleons and leptons, which could give contributions to proton charge radius, (g - 2)μ, 8Be-4He anomaly and electric dipole moment (EDM) of Standard Model (SM) particles. In particular, we estimate sensitivity of NA64μ experiment to observe muon missing energy events involving hidden scalar and vector particles. That analysis is based on GEANT4 Monte Carlo simulation of the signal process of muon scattering off target nuclei μN → μNS(V ) followed by invisible boson decay into Dark Matter (DM) particles, S(V ) → χχ. The existence of light subGeV bosons could possibly explain the muon (g -2) anomaly observed. We also summarize existing bounds on ATOMKI X17(JP= 0-, 1±) boson coupling with neutron, proton and electron. We implement these constraints to estimate the contribution of P, V and A particles to proton charge radius via direct 1-loop calculation of Sachs form factors. The analysis reveals the corresponding contribution is negligible. We also calculate bounds on dark axion portal couplings of dimension-five operators, which contribute to the EDMs of leptons and neutron. Copyright © 2020, The Authors. All rights reserved.

关键词： Bosons

Updated limits on the CP violating ηππ and η′ππ couplings derived from the neutron EDM

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Physical Review D 2019年第11期99卷 115004-115004页

作者： Alexey S. Zhevlakov Thomas Gutsche Valery E. Lyubovitskij Department of Physics Tomsk State University 634050 Tomsk Russia Matrosov Institute for System Dynamics and Control Theory SB RAS Lermontov Street 134 664033 Irkutsk Russia Institut für Theoretische Physik Universität Tübingen Kepler Center for Astro and Particle Physics Auf der Morgenstelle 14 D-72076 Tübingen Germany Departamento de Física y Centro Científico Tecnológico de Valparaíso-CCTVal Universidad Técnica Federico Santa María Casilla 110-V Valparaíso Chile

We complete our derivation of upper limits on the CP violating ηππ and η′ππ couplings from an analysis of their two-loop contributions to the neutron electric dipole moment (nEDM). We use a phenomenological Lagrangian approach which is formulated in terms of hadronic degrees of freedom—nucleons and pseudoscalar mesons. The essential part of the Lagrangian contains the CP violating couplings between η(η′) and pions. Previously, we included photons using minimal substitution in case of the proton and charged pions. Now we extend our Lagrangian by adding the nonminimal couplings, i.e., anomalous magnetic couplings of nucleons with the photon. The obtained numerical upper limits for the ηππ and η′ππ couplings |fηππ(Mη2)|<4.4×10−11 and |fη′ππ(Mη′2)|<3.8×10−11 can be useful for the related, planned experiments at the JLab Eta Factory. Using present experimental limits on the nEDM, we derive upper limits on the CP violating θ¯ parameter of θ¯<4.7×10−10.

关键词： Electric moment Neutrons CP violation

Updated limits on the CP violating ηππ and η0ππ couplings derived from the neutron EDM

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arXiv 2019年

作者： Zhevlakov, Alexey S. Gutsche, Thomas Lyubovitskij, Valery E. Department of Physics Tomsk State University Tomsk634050 Russia Matrosov Institute for System Dynamics and Control Theory SB RAS Lermontov str. 134 Irkutsk664033 Russia Institut für Theoretische Physik Universität Tübingen Kepler Center for Astro and Particle Physics Auf der Morgenstelle 14 TübingenD-72076 Germany Departamento de Física y Centro Científico Tecnológico de Valparaíso-CCTVal Universidad Técnica Federico Santa María Casilla 110-V Valparaíso Chile

We complete our derivation of upper limits on the CP violating ηππ and η0ππ couplings from an analysis of their two-loop contributions to the neutron electric dipole moment (nEDM). We use a phenomenological Lagrangian approach which is formulated in terms of hadronic degrees of freedom - nucleons and pseudoscalar mesons. The essential part of the Lagrangian contains the CP violating couplings between η(η0) and pions. Previously, we included photons using minimal substitution in case of the proton and charged pions. Now we extend our Lagrangian by adding the nonminimal couplings, i.e. anomalous magnetic couplings of nucleons with the photon. The obtained numerical upper limits for the ηππ and η0ππ couplings |fηππ(Mη2)| −11 and |fη0ππ(Mη20)| −11 can be useful for the related, planned experiments at the JLab Eta Factory. Using present experimental limits on the nEDM, we derive upper limits on the CP violating θ¯ parameter of θ¯ −10. Copyright © 2019, The Authors. All rights reserved.

关键词： Lagrange multipliers

Bounds on rare decays of η and η′ mesons from the neutron EDM

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Physical Review D 2019年第3期99卷 031703(R)-031703(R)页

作者： Alexey S. Zhevlakov Mikhail Gorchtein Astrid N. Hiller Blin Thomas Gutsche Valery E. Lyubovitskij Department of Physics Tomsk State University 634050 Tomsk Russia Matrosov Institute for System Dynamics and Control Theory SB RAS Lermontov str. 134 664033 Irkutsk Russia Institut für Kernphysik Johannes Gutenberg-Universität Mainz Germany and PRISMA Cluster of Excellence Johannes Gutenberg-Universität 55122 Mainz Germany Institut für Theoretische Physik Universität Tübingen Kepler Center for Astro and Particle Physics Auf der Morgenstelle 14 D-72076 Tübingen Germany Departamento de Física y Centro Científico Tecnológico de Valparaíso-CCTVal Universidad Técnica Federico Santa María Casilla 110-V Valparaíso Chile Laboratory of Particle Physics Tomsk Polytechnic University 634050 Tomsk Russia

We provide model-independent bounds on the rates of rare decays η(η′)→ππ based on experimental limits on the neutron electric dipole moment (nEDM). Starting from phenomenological η(η′)ππ couplings, the nEDM arises at the two-loop level. The leading-order relativistic chiral perturbation theory calculation with the minimal photon coupling to charged pions and a proton inside the loops leads to a finite, counterterm-free result. This is an improvement upon previous estimates which used approximations in evaluating the two-loop contribution and were plagued by divergences. While constraints on the η(η′)ππ couplings in our phenomenological approach are somewhat milder than in the picture with the QCD θ term, our calculation means that whatever the origin of these couplings, the decays η(η′)→2π will remain unobservable in the near future.

关键词： Chiral perturbation theory Effective field theory Hadronic decays Rare decays Neutrons

Load-Aware Strategies for Cloud-Based VoIP Optimization with VM Startup Prediction

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Load-Aware Strategies for Cloud-Based VoIP Optimization with...

IEEE International Symposium on Parallel and Distributed Processing Workshops and Phd Forum (IPDPSW)

作者： Jorge M. Cortes-Mendoza Andrei Tchernykh Igor Bychkov Alexander Feoktistov Pascal Bouvry Loic Didelot Computer Science Department CICESE Research Center Ensenada Baja California México Matrosov Institute for System Dynamics and Control Theory of SB RAS Irkutsk Russia Matrosov Inst. for Syst. Dynamics & Control Theor. Irkutsk Russia MIXvoip S.A. Sandweiler Luxembourg

In this paper, we address cloud VoIP scheduling strategies to provide appropriate levels of quality of service to users, and cost to VoIP service providers. This bi-objective focus is reasonable and representative for real installations and applications. We conduct comprehensive simulation on real data of twenty three on-line non-clairvoyant scheduling strategies with fixed threshold of utilization to request VMs, and twenty strategies with dynamic prediction of the load. We show that our load-aware with predictions strategies outperform the known ones providing suitable quality of service and lower cost. The robustness of these strategies is also analyzed varying VM startup time delays to deal with realistic VoIP cloud environments.

关键词： Cloud computing Quality of service Codecs Servers Load modeling Telephone sets Bandwidth