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Article ; Online: The contribution of multi-channel pion-pion scattering to the final states of ϒ-meson family decays

Surovtsev Yu.S. / Bydžovský P. / Gutsche T. / Kamiński R. / Lyubovitskij V.E. / Nagy M.

EPJ Web of Conferences, Vol 81, p

2014 Volume 05028

Abstract: The effect of isoscalar S-wave multi-channel pion-pion scattering (ππ → ππ, KK̄, ηη) is considered in the analysis of data on decays – ϒ(2S) → ϒ(1S)ππ, ϒ(3S) → ϒ(1S)ππ and ϒ(3S) → ϒ(2S)ππ. ...

Abstract	The effect of isoscalar S-wave multi-channel pion-pion scattering (ππ → ππ, KK̄, ηη) is considered in the analysis of data on decays – ϒ(2S) → ϒ(1S)ππ, ϒ(3S) → ϒ(1S)ππ and ϒ(3S) → ϒ(2S)ππ.
Keywords	Physics ; QC1-999 ; Science ; Q
Language	English
Publishing date	2014-01-01T00:00:00Z
Publisher	EDP Sciences
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: The contribution of multi-channel pion-pion scattering to the final states of ϒ-meson family decays

Surovtsev Yu.S. / Bydžovský P. / Gutsche T. / Kamiński R. / Lyubovitskij V.E. / Nagy M.

EPJ Web of Conferences, Vol 81, p

2014 Volume 05028

Abstract	The effect of isoscalar S-wave multi-channel pion-pion scattering (ππ → ππ, KK̄, ηη) is considered in the analysis of data on decays – ϒ(2S) → ϒ(1S)ππ, ϒ(3S) → ϒ(1S)ππ and ϒ(3S) → ϒ(2S)ππ.
Keywords	Physics ; QC1-999 ; Science ; Q
Language	English
Publishing date	2014-01-01T00:00:00Z
Publisher	EDP Sciences
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Parameters of scalar resonances from the combined analysis of ππ scattering and coupled-channel data

Lyubovitskij V.E. / Gutsche T. / Bydžovský P. / Surovtsev Yu.S. / Kamiński R. / Nagy M.

EPJ Web of Conferences, Vol 37, p

2012 Volume 09036

Abstract: Peculiarities of obtaining parameters for broad multichannel resonances from data are discussed analyzing the experimental data on processes ππ → ππ, KK¯${m{Kar K}}$, in the scalar channel in a model-independent approach based on analyticity and ... ...

Abstract	Peculiarities of obtaining parameters for broad multichannel resonances from data are discussed analyzing the experimental data on processes ππ → ππ, KK¯${m{Kar K}}$, in the scalar channel in a model-independent approach based on analyticity and unitarity and using an uniformization procedure. It is shown that one can obtain a good description of the ππ scattering data from the threshold up to 1.89 GeV with values of resonance parameters cited in the PDG tables as preferred. However, in this case the representation of the ππ background is not satisfactory and the data on the coupled process ππ → KK¯${m{Kar K}}$ are not well described, above 1.15 GeV even qualitatively. The combined analysis of the considered coupled processes is needed, which is also carried out satisfactorily. Then both above-indicated deficiencies related to the one-channel analysis are removed. The most important change concerns parameters of the f0(600) which are now in some accordance with the prediction by Weinberg on the basis of mended symmetry. The obtained ππ- scattering length agrees well with the values extracted from the data on Ke4 decay and DIRAC experiment and also with results from ChPT.
Keywords	Physics ; QC1-999 ; Science ; Q ; DOAJ:Physics (General) ; DOAJ:Physics and Astronomy
Language	English
Publishing date	2012-12-01T00:00:00Z
Publisher	EDP Sciences
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Search for Light Dark Matter with NA64 at CERN.

Andreev, Yu M / Banerjee, D / Banto Oberhauser, B / Bernhard, J / Bisio, P / Celentano, A / Charitonidis, N / Chumakov, A G / Cooke, D / Crivelli, P / Depero, E / Dermenev, A V / Donskov, S V / Dusaev, R R / Enik, T / Frolov, V N / Galleguillos Silva, R B / Gardikiotis, A / Gertsenberger, S V /

Girod, S / Gninenko, S N / Hösgen, M / Kachanov, V A / Kambar, Y / Karneyeu, A E / Kasianova, E A / Kekelidze, G D / Ketzer, B / Kirpichnikov, D V / Kirsanov, M M / Kolosov, V N / Kramarenko, V A / Kravchuk, L V / Krasnikov, N V / Kuleshov, S V / Lyubovitskij, V E / Lysan, V / Marini, A / Marsicano, L / Matveev, V A / Mena Fredes, R / Mena Yanssen, R G / Molina Bueno, L / Mongillo, M / Peshekhonov, D V / Polyakov, V A / Radics, B / Salamatin, K M / Samoylenko, V D / Sieber, H / Shchukin, D A / Soto, O / Tikhomirov, V O / Tlisova, I V / Toropin, A N / Tuzi, M / Vasilishin, B I / Volkov, P V / Volkov, V Yu / Voronchikhin, I V / Zamora-Saá, J / Zhevlakov, A S

Physical review letters

2023 Volume 131, Issue 16, Page(s) 161801

Abstract: Thermal dark matter models with particle χ masses below the electroweak scale can provide an explanation for the observed relic dark matter density. This would imply the existence of a new feeble interaction between the dark and ordinary matter. We ... ...

Abstract	Thermal dark matter models with particle χ masses below the electroweak scale can provide an explanation for the observed relic dark matter density. This would imply the existence of a new feeble interaction between the dark and ordinary matter. We report on a new search for the sub-GeV χ production through the interaction mediated by a new vector boson, called the dark photon A^{'}, in collisions of 100 GeV electrons with the active target of the NA64 experiment at the CERN SPS. With 9.37×10^{11} electrons on target collected during 2016-2022 runs NA64 probes for the first time the well-motivated region of parameter space of benchmark thermal scalar and fermionic dark matter models. No evidence for dark matter production has been found. This allows us to set the most sensitive limits on the A^{'} couplings to photons for masses m_{A^{'}}≲0.35 GeV, and to exclude scalar and Majorana dark matter with the χ-A^{'} coupling α_{D}≤0.1 for masses 0.001≲m_{χ}≲0.1 GeV and 3m_{χ}≤m_{A^{'}}.
Language	English
Publishing date	2023-11-05
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.131.161801
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Constraints on New Physics in Electron g-2 from a Search for Invisible Decays of a Scalar, Pseudoscalar, Vector, and Axial Vector.

Andreev, Yu M / Banerjee, D / Bernhard, J / Burtsev, V E / Chumakov, A G / Cooke, D / Crivelli, P / Depero, E / Dermenev, A V / Donskov, S V / Dusaev, R R / Enik, T / Charitonidis, N / Feshchenko, A / Frolov, V N / Gardikiotis, A / Gerassimov, S G / Gninenko, S N / Hösgen, M /

Kachanov, V A / Karneyeu, A E / Kekelidze, G / Ketzer, B / Kirpichnikov, D V / Kirsanov, M M / Kolosov, V N / Konorov, I V / Kovalenko, S G / Kramarenko, V A / Kravchuk, L V / Krasnikov, N V / Kuleshov, S V / Lyubovitskij, V E / Lysan, V / Matveev, V A / Mikhailov, Yu V / Molina Bueno, L / Peshekhonov, D V / Polyakov, V A / Radics, B / Rojas, R / Rubbia, A / Samoylenko, V D / Sieber, H / Shchukin, D / Tikhomirov, V O / Tlisova, I / Toropin, A N / Trifonov, A Yu / Vasilishin, B I / Volkov, P V / Volkov, V Yu

Physical review letters

2021 Volume 126, Issue 21, Page(s) 211802

Abstract: We performed a search for a new generic X boson, which could be a scalar (S), pseudoscalar (P), vector (V), or an axial vector (A) particle produced in the 100 GeV electron scattering off nuclei, e^{-}Z→e^{-}ZX, followed by its invisible decay in the ... ...

Abstract	We performed a search for a new generic X boson, which could be a scalar (S), pseudoscalar (P), vector (V), or an axial vector (A) particle produced in the 100 GeV electron scattering off nuclei, e^{-}Z→e^{-}ZX, followed by its invisible decay in the NA64 experiment at CERN. No evidence for such a process was found in the full NA64 dataset of 2.84×10^{11} electrons on target. We place new bounds on the S, P, V, A coupling strengths to electrons, and set constraints on their contributions to the electron anomalous magnetic moment a_{e}, \|Δa_{X}\|≲10^{-15}-10^{-13} for the X mass region 1 MeV≲m_{X}≲1 GeV. These results are an order of magnitude more sensitive compared to the current accuracy on a_{e} from the electron g-2 experiments and recent high-precision determination of the fine structure constant.
Language	English
Publishing date	2021-06-11
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.126.211802
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Search for a New B-L Z^{'} Gauge Boson with the NA64 Experiment at CERN.

Andreev, Yu M / Banerjee, D / Banto Oberhauser, B / Bernhard, J / Bisio, P / Burtsev, V E / Celentano, A / Charitonidis, N / Chumakov, A G / Cooke, D / Crivelli, P / Depero, E / Dermenev, A V / Donskov, S V / Dusaev, R R / Enik, T / Frolov, V N / Gardikiotis, A / Gerassimov, S G /

Gninenko, S N / Hösgen, M / Jeckel, M / Kachanov, V A / Karneyeu, A E / Kekelidze, G / Ketzer, B / Kirpichnikov, D V / Kirsanov, M M / Kolosov, V N / Kovalenko, S G / Kramarenko, V A / Kravchuk, L V / Krasnikov, N V / Kuleshov, S V / Lyubovitskij, V E / Lysan, V / Marsicano, L / Matveev, V A / Mikhailov, Yu V / Molina Bueno, L / Peshekhonov, D V / Polyakov, V A / Radics, B / Rubbia, A / Samalantin, K M / Samoylenko, V D / Sieber, H / Shchukin, D / Soto, O / Tikhomirov, V O / Tlisova, I V / Toropin, A N / Vasilishin, B I / Volkov, P V / Volkov, V Yu / Voronchikhin, I / Zamora-Saá, J

Physical review letters

2022 Volume 129, Issue 16, Page(s) 161801

Abstract: A search for a new Z^{'} gauge boson associated with (un)broken B-L symmetry in the keV-GeV mass range is carried out for the first time using the missing-energy technique in the NA64 experiment at the CERN SPS. From the analysis of the data with 3.22×10^ ...

Abstract	A search for a new Z^{'} gauge boson associated with (un)broken B-L symmetry in the keV-GeV mass range is carried out for the first time using the missing-energy technique in the NA64 experiment at the CERN SPS. From the analysis of the data with 3.22×10^{11} electrons on target collected during 2016-2021 runs, no signal events were found. This allows us to derive new constraints on the Z^{'}-e coupling strength, which, for the mass range 0.3≲m_{Z^{'}}≲100 MeV, are more stringent compared to those obtained from the neutrino-electron scattering data.
Language	English
Publishing date	2022-10-20
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.129.161801
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Search for Axionlike and Scalar Particles with the NA64 Experiment.

Banerjee, D / Bernhard, J / Burtsev, V E / Chumakov, A G / Cooke, D / Crivelli, P / Depero, E / Dermenev, A V / Donskov, S V / Dusaev, R R / Enik, T / Charitonidis, N / Feshchenko, A / Frolov, V N / Gardikiotis, A / Gerassimov, S G / Gninenko, S N / Hösgen, M / Jeckel, M /

Kachanov, V A / Karneyeu, A E / Kekelidze, G / Ketzer, B / Kirpichnikov, D V / Kirsanov, M M / Kolosov, V N / Konorov, I V / Kovalenko, S G / Kramarenko, V A / Kravchuk, L V / Krasnikov, N V / Kuleshov, S V / Lyubovitskij, V E / Lysan, V / Matveev, V A / Mikhailov, Yu V / Molina Bueno, L / Peshekhonov, D V / Polyakov, V A / Radics, B / Rojas, R / Rubbia, A / Samoylenko, V D / Sieber, H / Shchukin, D / Tikhomirov, V O / Tlisova, I / Tlisov, D A / Toropin, A N / Trifonov, A Yu / Vasilishin, B I / Vasquez Arenas, G / Volkov, P V / Volkov, V Yu / Ulloa, P

Physical review letters

2020 Volume 125, Issue 8, Page(s) 81801

Abstract: We carried out a model-independent search for light scalar (s) and pseudoscalar axionlike (a) particles that couple to two photons by using the high-energy CERN SPS H4 electron beam. The new particles, if they exist, could be produced through the ... ...

Abstract	We carried out a model-independent search for light scalar (s) and pseudoscalar axionlike (a) particles that couple to two photons by using the high-energy CERN SPS H4 electron beam. The new particles, if they exist, could be produced through the Primakoff effect in interactions of hard bremsstrahlung photons generated by 100 GeV electrons in the NA64 active dump with virtual photons provided by the nuclei of the dump. The a(s) would penetrate the downstream HCAL module, serving as a shield, and would be observed either through their a(s)→γγ decay in the rest of the HCAL detector, or as events with a large missing energy if the a(s) decays downstream of the HCAL. This method allows for the probing of the a(s) parameter space, including those from generic axion models, inaccessible to previous experiments. No evidence of such processes has been found from the analysis of the data corresponding to 2.84×10^{11} electrons on target, allowing us to set new limits on the a(s)γγ-coupling strength for a(s) masses below 55 MeV.
Language	English
Publishing date	2020-03-25
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.125.081801
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Probing the explanation of the muon (g-2) anomaly and thermal light dark matter with the semi-visible dark photon channel.

Cazzaniga, C / Odagiu, P / Depero, E / Molina Bueno, L / Andreev, Yu M / Banerjee, D / Bernhard, J / Burtsev, V E / Charitonidis, N / Chumakov, A G / Cooke, D / Crivelli, P / Dermenev, A V / Donskov, S V / Dusaev, R R / Enik, T / Feshchenko, A / Frolov, V N / Gardikiotis, A /

Gerassimov, S G / Girod, S / Gninenko, S N / Hösgen, M / Kachanov, V A / Karneyeu, A E / Kekelidze, G / Ketzer, B / Kirpichnikov, D V / Kirsanov, M M / Kolosov, V N / Konorov, I V / Kovalenko, S G / Kramarenko, V A / Kravchuk, L V / Krasnikov, N V / Kuleshov, S V / Lyubovitskij, V E / Lysan, V / Matveev, V A / Mikhailov, Yu V / Peshekhonov, D V / Polyakov, V A / Radics, B / Rojas, R / Rubbia, A / Samoylenko, V D / Shchukin, D / Sieber, H / Tikhomirov, V O / Tlisova, I V / Tlisov, D A / Toropin, A N / Trifonov, A Yu / Vasilishin, B I / Arenas, G Vasquez / Volkov, P V / Volkov, V Yu / Ulloa, P

The European physical journal. C, Particles and fields

2021 Volume 81, Issue 10, Page(s) 959

Abstract: We report the results of a search for a new vector boson ( ...

Abstract	We report the results of a search for a new vector boson (
Language	English
Publishing date	2021-10-30
Publishing country	France
Document type	Journal Article
ZDB-ID	1459069-4
ISSN	1434-6052 ; 1434-6044
ISSN (online)	1434-6052
ISSN	1434-6044
DOI	10.1140/epjc/s10052-021-09705-5
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Dark Matter Search in Missing Energy Events with NA64.

Banerjee, D / Burtsev, V E / Chumakov, A G / Cooke, D / Crivelli, P / Depero, E / Dermenev, A V / Donskov, S V / Dusaev, R R / Enik, T / Charitonidis, N / Feshchenko, A / Frolov, V N / Gardikiotis, A / Gerassimov, S G / Gninenko, S N / Hösgen, M / Jeckel, M / Karneyeu, A E /

Kekelidze, G / Ketzer, B / Kirpichnikov, D V / Kirsanov, M M / Konorov, I V / Kovalenko, S G / Kramarenko, V A / Kravchuk, L V / Krasnikov, N V / Kuleshov, S V / Lyubovitskij, V E / Lysan, V / Matveev, V A / Mikhailov, Yu V / Molina Bueno, L / Peshekhonov, D V / Polyakov, V A / Radics, B / Rojas, R / Rubbia, A / Samoylenko, V D / Shchukin, D / Tikhomirov, V O / Tlisova, I / Tlisov, D A / Toropin, A N / Trifonov, A Yu / Vasilishin, B I / Vasquez Arenas, G / Volkov, P V / Volkov, V Yu / Ulloa, P

Physical review letters

2019 Volume 123, Issue 12, Page(s) 121801

Abstract: A search for sub-GeV dark matter production mediated by a new vector boson A^{'}, called a dark photon, is performed by the NA64 experiment in missing energy events from 100 GeV electron interactions in an active beam dump at the CERN SPS. From the ... ...

Abstract	A search for sub-GeV dark matter production mediated by a new vector boson A^{'}, called a dark photon, is performed by the NA64 experiment in missing energy events from 100 GeV electron interactions in an active beam dump at the CERN SPS. From the analysis of the data collected in the years 2016, 2017, and 2018 with 2.84×10^{11} electrons on target no evidence of such a process has been found. The most stringent constraints on the A^{'} mixing strength with photons and the parameter space for the scalar and fermionic dark matter in the mass range ≲0.2 GeV are derived, thus demonstrating the power of the active beam dump approach for the dark matter search.
Language	English
Publishing date	2019-10-21
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.123.121801
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Book: Electromagnetic form factors of nucleons in a relativistic three-quark model

Ivanov, M. A / Locher, M. P / Lyubovitskij, V. E

(PSI-PR / Paul Scherrer Institut ; 96-08)

1996

Author's details	M. A. Ivanov; M. P. Locher; V. E. Lyubovitskij
Series title	PSI-PR / Paul Scherrer Institut ; 96-08
Language	English
Size	22 S
Publisher	Paul Scherrer Institut
Publishing place	Villigen
Document type	Book
Database	Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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