First observation of a tau neutrino charged current interaction with charm production in the Opera experiment

Published on Dec 23, 2019in arXiv: High Energy Physics - Experiment
N. Agafonova17
Estimated H-index: 17
,
A. Alexandrov6
Estimated H-index: 6
+ 124 AuthorsC. S. Yoon22
Estimated H-index: 22
Abstract
An event topology with two secondary vertices compatible with the decay of short-lived particles was found in the analysis of neutrino interactions in the Opera target. The observed topology is compatible with tau neutrino charged current (CC) interactions with charm production and neutrino neutral current (NC) interactions with c\overline{c}pair production. However, other processes can mimic this topology. A dedicated analysis was implemented to identify the underlying process. A Monte Carlo simulation was developed and complementary procedures were introduced in the kinematic reconstruction. A multivariate analysis technique was used to achieve an optimal separation of signal from background. Most likely, this event is a \nu_{\tau}CC interaction with charm production, the tau and charm particle decaying into 1 prong and 2 prongs, respectively. The significance of this observation is evaluated.
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References37
#1N. Agafonova (HSE: National Research University – Higher School of Economics)H-Index: 1
#2R. BrugneraH-Index: 35
Last. Akitaka ArigaH-Index: 32
view all 136 authors...
The OPERA experiment was designed to study ν_{μ}→ν_{τ} oscillations in the appearance mode in the CERN to Gran Sasso Neutrino beam (CNGS). In this Letter, we report the final analysis of the full data sample collected between 2008 and 2012, corresponding to 17.97×10^{19} protons on target. Selection criteria looser than in previous analyses have produced ten ν_{τ} candidate events, thus reducing the statistical uncertainty in the measurement of the oscillation parameters and of ν_{τ} properties....
#1F. LaudisioH-Index: 4
We present an automatic procedure developed to reconstruct electromagnetic EM showers in the nuclear emulsions of the OPERA neutrino experiment. It is an entirely new procedure based on emulsion images acquired with 1 micrometer pitch tomography. The enhanced 3D accuracy is used in the reconstruction of particles' tracks and for the evaluation of shower energies in interesting neutrino event topologies detected by OPERA.
#1Andrey Alexandrov (RAS: Russian Academy of Sciences)H-Index: 6
#2A. BuonauraH-Index: 11
view all 14 authors...
Nuclear emulsions have been widely used in particle physics to identify new particles through the observation of their decays thanks to their unique spatial resolution. Nevertheless, before the advent of automatic scanning systems, the emulsion analysis was very demanding in terms of well trained manpower. Due to this reason, they were gradually replaced by electronic detectors, until the '90s, when automatic microscopes started to be developed in Japan and in Europe. Automatic scanning was esse...
#1N. AgafonovaH-Index: 17
#2A. B. AleksandrovH-Index: 13
Last. S. Zemskova (JINR: Joint Institute for Nuclear Research)H-Index: 14
view all 141 authors...
The OPERA experiment was designed to search for \nu_{\mu} \rightarrow \nu_{\tau}oscillations in appearance mode, i.e. by detecting the \tauleptons produced in charged current \nu_{\tau}interactions. The experiment took data from 2008 to 2012 in the CERN Neutrinos to Gran Sasso beam. The observation of \nu_{\mu} \rightarrow \nu_{\tau}appearance, achieved with four candidate events in a sub-sample of the data, was previously reported. In this paper, a fifth \nu_{\tau}candidate event...
#1N. Agafonova (RAS: Russian Academy of Sciences)H-Index: 17
#2A. B. AleksandrovH-Index: 13
Last. A. Zghiche (University of Savoy)H-Index: 22
view all 139 authors...
The OPERA experiment, designed to perform the first observation of $$\nu _\mu \rightarrow \nu _\tau$$ oscillations in appearance mode through the detection of the $$\tau$$ leptons produced in $$\nu _\tau$$ charged current interactions, has collected data from 2008 to 2012. In the present paper, the procedure developed to detect $$\tau$$ particle decays, occurring over distances of the order of $$1~\mathrm{mm}$$ from the neutrino interaction point, is described in detail and applied to the se...
#1N. AgafonovaH-Index: 17
#2A. B. AleksandrovH-Index: 13
Last. A. Zghiche (University of Savoy)H-Index: 12
view all 169 authors...
The OPERA neutrino experiment is designed to perform the first observation of neutrino oscillations in direct appearance mode in the νμ→ντ channel, via the detection of the τ-leptons created in charged current ντ interactions. The detector, located in the underground Gran Sasso Laboratory, consists of an emulsion/lead target with an average mass of about 1.2 kt, complemented by electronic detectors. It is exposed to the CERN Neutrinos to Gran Sasso beam, with a baseline of 730 km and a mean ener...
#1Cristiano Bozza (UNISA: University of Salerno)H-Index: 24
Last. C. ValieriH-Index: 3
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Abstract The European Scanning System, developed to analyse nuclear emulsions at high speed, has been completed with the development of a high level software infrastructure to automate and support large-scale emulsion scanning. In one year, an average installation is capable of performing data-taking and online analysis on a total surface ranging from few m 2 to tens of m 2 , acquiring many billions of tracks, corresponding to several TB. This paper focuses on the procedures that have been imple...
#1N. Agafonova (RAS: Russian Academy of Sciences)H-Index: 17
#2A. B. Aleksandrov (RAS: Russian Academy of Sciences)H-Index: 13
Last. R Zimmermann (UHH: University of Hamburg)H-Index: 10
view all 186 authors...
A new method of momentum measurement of charged particles through multiple Coulomb scattering (MCS) in the OPERA lead-emulsion target is presented. It is based on precise measurements of track angular deviations carried out thanks to the very high resolution of nuclear emulsions. The algorithm has been tested with Monte Carlo pions. The results are found to describe within the expected uncertainties the data obtained from test beams. We also present a comparison of muon momenta evaluated through...
#1Gioacchino Ranucci (INFN: Istituto Nazionale di Fisica Nucleare)H-Index: 35
Abstract The experimental issue of the search for new particles of unknown mass poses the challenge of exploring a wide interval to look for the usual signatures represented by excess of events above the background. A side effect of such a broad range quest is that the significance calculations valid for signals of known location are no more applicable when such an information is missing. This circumstance is commonly termed in high energy physics applications as the look elsewhere effect. How i...
#1A. Kayis-Topaksu (Çukurova University)H-Index: 14
#2G. Onengut (Çukurova University)H-Index: 79
Last. I. Tezuka (Utsunomiya University)H-Index: 19
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The nuclear emulsion target of the CHORUS detector was exposed to the wide-band neutrino beam of the CERN SPS of 27 GeV average neutrino energy from 1994 to 1997. In total, about 100 000 charged-current (CC) neutrino interactions with at least one identified muon were located in the emulsion target and fully reconstructed, using newly developed automated scanning systems. Charmed particles were searched for by a program recognizing particle decays. The observation of the decay in nuclear emulsio...
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