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Article ; Online: New Bounds from Positronium Decays on Massless Mirror Dark Photons.

Vigo, C / Gerchow, L / Radics, B / Raaijmakers, M / Rubbia, A / Crivelli, P

2020 Volume 124, Issue 10, Page(s) 101803

Abstract: We present the results of a search for a hidden mirror sector in positronium decays with a sensitivity comparable with the bounds set by the prediction of the primordial He^{4} abundance from big bang nucleosynthesis. No excess of events compatible with ... ...

Abstract	We present the results of a search for a hidden mirror sector in positronium decays with a sensitivity comparable with the bounds set by the prediction of the primordial He^{4} abundance from big bang nucleosynthesis. No excess of events compatible with decays into the dark sector is observed, resulting in an upper limit for the branching ratio of this process of 3.0×10^{-5} (90% C.L.). This is an order of magnitude more stringent than the current existing laboratory bounds and it constrains the mixing strength of ordinary photons to dark mirror photons at a level of ϵ<5.0×10^{-8}.
Language	English
Publishing date	2020-03-26
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.124.101803
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Book ; Online: Deep-learning-based decomposition of overlapping-sparse images

Alonso-Monsalve, Saúl / Sgalaberna, Davide / Zhao, Xingyu / Molines, Adrien / McGrew, Clark / Rubbia, André

application at the vertex of neutrino interactions

2023

Abstract: Image decomposition plays a crucial role in various computer vision tasks, enabling the analysis and manipulation of visual content at a fundamental level. Overlapping images, which occur when multiple objects or scenes partially occlude each other, pose ...

Abstract	Image decomposition plays a crucial role in various computer vision tasks, enabling the analysis and manipulation of visual content at a fundamental level. Overlapping images, which occur when multiple objects or scenes partially occlude each other, pose unique challenges for decomposition algorithms. The task intensifies when working with sparse images, where the scarcity of meaningful information complicates the precise extraction of components. This paper presents a solution that leverages the power of deep learning to accurately extract individual objects within multi-dimensional overlapping-sparse images, with a direct application in high-energy physics with decomposition of overlaid elementary particles obtained from imaging detectors. In particular, the proposed approach tackles a highly complex yet unsolved problem: identifying and measuring independent particles at the vertex of neutrino interactions, where one expects to observe detector images with multiple indiscernible overlapping charged particles. By decomposing the image of the detector activity at the vertex through deep learning, it is possible to infer the kinematic parameters of the identified low-momentum particles - which otherwise would remain neglected - and enhance the reconstructed energy resolution of the neutrino event. We also present an additional step - that can be tuned directly on detector data - combining the above method with a fully-differentiable generative model to improve the image decomposition further and, consequently, the resolution of the measured parameters, achieving unprecedented results. This improvement is crucial for precisely measuring the parameters that govern neutrino flavour oscillations and searching for asymmetries between matter and antimatter. Comment: 15 pages, 6 figures
Keywords	Computer Science - Computer Vision and Pattern Recognition ; Computer Science - Machine Learning ; High Energy Physics - Experiment
Subject code	004
Publishing date	2023-10-30
Publishing country	us
Document type	Book ; Online
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Book ; Online: Artificial intelligence for improved fitting of trajectories of elementary particles in inhomogeneous dense materials immersed in a magnetic field

Alonso-Monsalve, Saúl / Sgalaberna, Davide / Zhao, Xingyu / McGrew, Clark / Rubbia, André

2022

Abstract: In this article, we use artificial intelligence algorithms to show how to enhance the resolution of the elementary particle track fitting in inhomogeneous dense detectors, such as plastic scintillators. We use deep learning to replace more traditional ... ...

Abstract	In this article, we use artificial intelligence algorithms to show how to enhance the resolution of the elementary particle track fitting in inhomogeneous dense detectors, such as plastic scintillators. We use deep learning to replace more traditional Bayesian filtering methods, drastically improving the reconstruction of the interacting particle kinematics. We show that a specific form of neural network, inherited from the field of natural language processing, is very close to the concept of a Bayesian filter that adopts a hyper-informative prior. Such a paradigm change can influence the design of future particle physics experiments and their data exploitation.
Keywords	Physics - Data Analysis ; Statistics and Probability ; Computer Science - Machine Learning ; High Energy Physics - Experiment
Publishing date	2022-11-09
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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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
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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 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
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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
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Book ; Online: First operation and performance of a 200 lt double phase LAr LEM-TPC with a 40x76 cm^2 readout

Badertscher, A. / Curioni, A. / Degunda, U. / Epprecht, L. / Gendotti, A. / Horikawa, S. / Knecht, L. / Natterer, D. Lussi G. / Nguyen, K. / Resnati, F. / Rubbia, A. / Viant, T.

2013

Abstract: In this paper we describe the design, construction, and operation of a first large area double-phase liquid argon Large Electron Multiplier Time Projection Chamber (LAr LEM-TPC). The detector has a maximum drift length of 60 cm and the readout consists ... ...

Abstract	In this paper we describe the design, construction, and operation of a first large area double-phase liquid argon Large Electron Multiplier Time Projection Chamber (LAr LEM-TPC). The detector has a maximum drift length of 60 cm and the readout consists of a $40\times 76$ cm$^2$ LEM and 2D projective anode to multiply and collect drifting charges. Scintillation light is detected by means of cryogenic PMTs positioned below the cathode. To record both charge and light signals, we have developed a compact acquisition system, which is scalable up to ton-scale detectors with thousands of charge readout channels. The acquisition system, as well as the design and the performance of custom-made charge sensitive preamplifiers, are described. The complete experimental setup has been operated for a first time during a period of four weeks at CERN in the cryostat of the ArDM experiment, which was equipped with liquid and gas argon purification systems. The detector, exposed to cosmic rays, recorded events with a single-channel signal-to-noise ratio in excess of 30 for minimum ionising particles. Cosmic muon tracks and their $\delta$-rays were used to assess the performance of the detector, and to estimate the liquid argon purity and the gain at different amplification fields. Comment: 23 pages, 21 figures
Keywords	Physics - Instrumentation and Detectors ; High Energy Physics - Experiment
Subject code	621
Publishing date	2013-01-21
Publishing country	us
Document type	Book ; Online
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Book ; Online: Long-term operation of a double phase LAr LEM Time Projection Chamber with a simplified anode and extraction-grid design

Cantini, C. / Epprecht, L. / Gendotti, A. / Horikawa, S. / Murphy, S. / Natterer, G. / Periale, L. / Resnati, F. / Rubbia, A. / Sergiampietri, F. / Viant, T. / Wu, S.

2013

Abstract: We report on the successful operation of a double phase Liquid Argon Large Electron Multiplier Time Projection Chamber (LAr LEM-TPC) equipped with two dimensional projective anodes with dimensions 10$\times$10 cm$^2$, and with a maximum drift length of ... ...

Abstract	We report on the successful operation of a double phase Liquid Argon Large Electron Multiplier Time Projection Chamber (LAr LEM-TPC) equipped with two dimensional projective anodes with dimensions 10$\times$10 cm$^2$, and with a maximum drift length of 21 cm. The anodes were manufactured for the first time from a single multilayer printed circuit board (PCB). Various layouts of the readout views have been tested and optimised. In addition, the ionisation charge was efficiently extracted from the liquid to the gas phase with a single grid instead of two previously. We studied the response and the gain of the detector to cosmic muon tracks. To study long-term stability over several weeks, we continuously operated the chamber at fixed electric field settings. We reproducibly observe that after an initial decrease with a characteristic time of $\tau\approx 1.6$ days, the observed gain is stable. In 46 days of operation, a total of 14.6 million triggers have been collected at a stable effective gain of $G_\infty\sim 15$ corresponding to a signal-to-noise ratio $(S/N)\gtrsim 60$ for minimum ionising tracks. During the full period, eight discharges across the LEM were observed. A maximum effective gain of 90 was also observed, corresponding to a signal-to-noise ratio $(S/N)\gtrsim 400$ for minimum ionising tracks, or $S/N\approx10$ for an energy deposition of 15 keV on a single readout channel. Comment: 19 pages, 13 figures
Keywords	Physics - Instrumentation and Detectors
Subject code	621
Publishing date	2013-12-23
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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