Abstract
The tau neutrino interaction cross-section was directly measured in the DONuT experiment but it suffers from a large systematic (∼50%) and statistical (∼30%) errors. The main source of the ...systematic error was due to poor knowledge of the tau neutrino flux. The DsTau experiment at CERN-SPS has been proposed to measure an inclusive differential cross-section of the
D
s
production with a consecutive decay to tau lepton in p-A interactions, which is a main source of tau neutrinos in neutrino beams at accelerators. The search for
D
s
→
τ
→
X
decay is challenging due to milimetric range of
D
s
and
τ
decay lengths and a small angle between them of the order of few mrad. Nevertheless a precise measurement is possible with the use of nuclear emulsion providing a sub-micron spatial resolution. The experiment is aiming to collect 2.3 × 10
8
proton interactions in the tungsten target, and to detect ∼ 1000
D
s
→
τ
→
X
decays. DsTau successfully performed a pilot run in 2018 collecting ∼10% of the full data and was approved as NA65 in 2019. The results from the pilot run are presented in this paper and the prospect for physics runs in 2021–2022 are given.
A new analysis of full OPERA data set was performed, based on looser selection criteria and multivariate approach. Oscillation parameters and tau neutrino cross-section have been determined with a ...reduced statistical uncertainty, and the discovery of tau neutrino appearance is confirmed at 6.1σ level. Moreover, the search for electron neutrino events has been extended to the full dataset, exploiting an improved method for the electron neutrino energy estimation. New limits have been set in the 3+1 neutrino model.
FASER is a new experiment at the CERN LHC which is located on the beam collision axis line-of-sight 480 m from the ATLAS collision point in unused service tunnel, TI12. The quite compact detector is ...designed to search for light and very weakly interacting new particles produced in the LHC collisions. The additional FASER
emulsion sub-detector allows to detect and study neutrinos of all flavors produced at LHC. The detector has been successfully installed and is taking data during the LHC Run 3. Details on physics prospects, detector design, commissioning status and first recorded data will be given in this paper.
A new study of a historical object on the territory of the Russian Federation, the Holy Trinity Danilov Monastery, implemented by the muon radiography is presented. The method is based on the ...registration of changes in the cosmic muon fluxes during their passage through the object under study. Nuclear photoemulsions with unique spatial and angular resolution having the widest range of applications in experimental nuclear physics were used as experimental equipment. The experiment demonstrates a high efficiency of the method in the search for hidden objects, the presence of which on the territory of the monastery is confirmed by the results obtained.
A test experiment using a Russian nuclear photoemulsion aimed at developing a technique for optimizing the number of emulsion layers for modern nuclear experiments is described. Nuclear emulsion ...tracks are automatically scanned and reconstructed in the angular range to 75° for the first time in Russia. Track reconstruction in various detector configurations is analyzed; experimental data are compared with simulation results. The minimum number of photoemulsion plates necessary, in particular, for using emulsion detectors in muon radiography experiments is estimated.
The results of an experiment devoted to studying archeological objects in the territory of the Holy Trinity Danilov Monastery in the town of Pereslavl-Zalessky, Yroslavl region, and performed by the ...muon radiography method are presented. The experiment in question is described, and the first results of the data analysis, which demonstrate the sensitivity of the chosen method to the task at hand, are presented.
The imaging method based on the absorption and scattering of atmospheric muons (muography method) uses the natural flow of muons formed in the interactions of cosmic rays in the atmosphere. The ...method is at the junction of elementary particle physics and research in other very diverse fields of natural science, in particular, in archaeology. The paper presents the first results of an experiment to study a unique underground structure in the Holy Dormition Pskov-Caves Monastery, which is a cultural object with a centuries-old history.
The method for visualizing the internal structure of objects (muography method) based on the analysis of the features of passages of atmospheric muons generated in cosmic ray interactions, is based ...on the spatial distributions of trajectories of penetrating muons recorded by detectors. The method is at the junction of elementary particle physics with many other areas of natural science, e.g., with archaeology. The article presents the results of a muographic study of two objects in the cave complex of a unique historical and archaeological monument, i.e., the Holy Dormition Pskovo-Pechersky Monastery. The experimental technique is based on nuclear emulsion detectors.
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