Procedure for short-lived particle detection in the OPERA experiment and its application to charm decays

Agafonova, N.
Aleksandrov, A.
Anokhina, A.
Aoki, S.
Ariga, A.
Ariga, T.
Bender, D.
Bertolin, A.
Bozza, C.
Brugnera, R.
Buonaura, A.
Buontempo, S.
Buettner, B.
Chernyavsky, M.
Chukanov, A.
Consiglio, L.
D'Ambrosio, N.
De Lellis, G.
De Serio, M.
Sanchez, P. Del Amo
Di Crescenzo, A.
Di Ferdinando, D.
Di Marco, N.
Dmitrievski, S.
Dracos, M.
Duchesneau, D.
Dusini, S.
Dzhatdoev, T.
Ebert, J.
Ereditato, A.
Fini, R. A.
Fukuda, T.
Galati, G.
Garfagnini, A.
Giacomelli, G.
Goellnitz, C.
Goldberg, J.
Gornushkin, Y.
Grella, G.
Güler, Ali Murat
Gustavino, C.
Hagner, C.
Hara, T.
Hollnagel, A.
Hosseini, B.
Ishida, H.
Ishiguro, K.
Jakovcic, K.
Jollet, C.
Kamiscioglu, C.
Kamiscioglu, M.
Kawada, J.
Kim, J. H.
Kim, S. H.
Kitagawa, N.
Klicek, B.
Kodama, K.
Komatsu, M.
Kose, U.
Kreslo, I.
Lauria, A.
Lenkeit, J.
Ljubicic, A.
Longhin, A.
Loverre, P.
Malgin, A.
Malenica, M.
Mandrioli, G.
Matsuo, T.
Matveev, V.
Mauri, N.
Medinaceli, E.
Meregaglia, A.
Mikado, S.
Monacelli, P.
Montesi, M. C.
Morishima, K.
Muciaccia, M. T.
Naganawa, N.
Naka, T.
Nakamura, M.
Nakano, T.
Nakatsuka, Y.
Niwa, K.
Ogawa, S.
Okateva, N.
Olshevsky, A.
Omura, T.
Ozaki, K.
Paoloni, A.
Park, B. D.
Park, I. G.
Pasqualini, L.
Pastore, A.
Patrizii, L.
Pessard, H.
Pistillo, C.
Podgrudkov, D.
Polukhina, N.
Pozzato, M.
Pupilli, F.
Roda, M.
Rokujo, H.
Roganova, T.
Rosa, G.
Ryazhskaya, O.
Sato, O.
Schembri, A.
Shakiryanova, I.
Shchedrina, T.
Sheshukov, A.
Shibuya, H.
Shiraishi, T.
Shoziyoev, G.
Simone, S.
Sioli, M.
Sirignano, C.
Sirri, G.
Spinetti, M.
Stanco, L.
Starkov, N.
Stellacci, S. M.
Stipcevic, M.
Strauss, T.
Strolin, P.
Takahashi, S.
Tenti, M.
Terranova, F.
Tioukov, V.
Tufanli, S.
Vilain, P.
Vladimirov, M.
Votano, L.
Vuilleumier, J. L.
Wilquet, G.
Wonsak, B.
Yoon, C. S.
Zemskova, S.
Zghiche, A.
The OPERA experiment, designed to perform the first observation of nu(mu) -> 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 mm from the neutrino interaction point, is described in detail and applied to the search for charmed hadrons, showing similar decay topologies as the tau lepton. In the analysed sample, 50 charm decay candidate events are observed while 54 +/- 4 are expected, proving that the detector performance and the analysis chain applied to neutrino events are well reproduced by the OPERA simulation and thus validating the methods for nu(tau) appearance detection.


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Özdemir, Enver Doruk; Aksel, Mehmet Haluk; Department of Mechanical Engineering (2005)
The aim of this study is to simulate the unsteady flow around rotating or oscillating airfoils. This will help to understand the rotor aerodynamics, which is essential in turbines and propellers. In this study, a pre-existing Euler solver with finite volume method that is developed in the Mechanical Engineering Department of Middle East Technical University (METU) is improved. This structured pre-existing code was developed for 2-D internal flows with Lax-Wendroff scheme. The improvement consist of firstly,...
More Results from the Opera Experiment at the Gran Sasso Underground Lab
Kamışcıoğlu, Mustafa (World Scientific Pub Co Pte Lt; 2017-09-05)
The OPERA experiment reached its main goal by proving the appearance of nu(tau) in the CNGS nu(mu) beam. Five nu(tau) candidates fulfilling the analysis defined in the proposal were detected with a S/B ratio of about ten allowing to reject the null hypothesis at 5.1 sigma. The search has been extended by loosening the selection criteria in order to obtain a statistically enhanced, lower purity, signal sample. One such interesting neutrino interaction with a double vertex topology having a high probability o...
Study of charged hadron multiplicities in charged-current neutrino-lead interactions in the OPERA detector
Agafonova, N.; et. al. (Springer Science and Business Media LLC, 2018-01-24)
The OPERA experiment was designed to search for nu(mu) -> nu(tau) oscillations in appearance mode through the direct observation of tau neutrinos in the CNGS neutrino beam. In this paper, we report a study of the multiplicity of charged particles produced in charged-current neutrino interactions in lead. We present charged hadron average multiplicities, their dispersion and investigate the KNO scaling in different kinematical regions. The results are presented in detail in the form of tables that can be use...
Results from the OPERA Experiment in the CNGS Beam
Paoloni, Alessandro; et. al. (2018-12-01)
The OPERA experiment was designed to observe v(mu) -> v(tau) oscillations through tau appearance on the CERN Neutrino to Gran Sasso (CNGS) beam over a baseline of 730 km. OPERA was a hybrid experiment composed of lead plates and emulsion layers acting as a target for neutrino interactions. The experiment was complemented with electronic detectors: scintillator strips used as Target Trackers and muon spectrometers. A review of the OPERA final results is presented in this paper.
Discovery of tau Neutrino Appearance in the CNGS Neutrino Beam with the OPERA Experiment
Agafonova, N.; et. al. (2015-09-01)
The OPERA experiment was designed to search for nu(mu) -> nu(tau) oscillations in appearance mode, i.e., by detecting the tau leptons 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 the nu(mu) -> nu(tau) appearance, achieved with four candidate events in a subsample of the data, was previously reported. In this Letter, a fifth nu(tau) candidate event, found in an enlarged data sample, is described. Toge...
Citation Formats
N. Agafonova et al., “Procedure for short-lived particle detection in the OPERA experiment and its application to charm decays,” EUROPEAN PHYSICAL JOURNAL C, pp. 0–0, 2014, Accessed: 00, 2020. [Online]. Available: