More Results from the Opera Experiment at the Gran Sasso Underground Lab

Kamışcıoğlu, Mustafa
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 of being a nu(tau) interaction with charm production is reported. Based on the enlarged data sample the estimation of Delta m(23)(2) in appearance mode is presented. The search for nu(e) interactions has been extended over the full data set with a more than twofold increase in statistics with respect to published data. The analysis of the nu(mu) -> nu(e) channel is updated and the implications of the electron neutrino sample in the framework of the 3+1 neutrino model is discussed. An analysis of nu(mu) -> nu(tau) interactions in the framework of the sterile neutrino model has also been performed. Finally, the results of the study of charged hadron multiplicity distributions is presented.


Procedure for short-lived particle detection in the OPERA experiment and its application to charm decays
Agafonova, N.; et. al. (2014-08-01)
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 ...
Neutrino interaction with an automatic scanning system in the OPERA environment
Hosseini, Behzad; Güler, Ali Murat; Department of Physics (2012)
The OPERA experiment was designed to search for nu-mu to nu-tau oscillations through the observation of nu-tau charged-current interactions in the OPERA target. This search requires a massive detector and very high spatial accuracy. Both requirements are fulfilled in the OPERA detector by using nuclear emulsion and lead plate in a modular structure called ECC brick. The OPERA detector consists of 150,000 ECC bricks and electronic detectors. The data taking was started in 2007 and is going on smootly. About 4...
Final results of the search for v(mu) -> v(e) oscillations with the OPERA detector in the CNGS beam
Agafonova, N.; et. al. (2018-06-27)
The OPERA experiment has discovered the tau neutrino appearance in the CNGS muon neutrino beam, in agreement with the 3 neutrino flavour oscillation hypothesis. The OPERA neutrino interaction target, made of Emulsion Cloud Chambers, was particularly efficient in the reconstruction of electromagnetic showers. Moreover, thanks to the very high granularity of the emulsion films, showers induced by electrons can be distinguished from those induced by pi(0)s, thus allowing the detection of charged current intera...
New results on nu(mu) -> nu(tau) appearance with the OPERA experiment in the CNGS beam
Agafonova, N.; et. al. (Springer Science and Business Media LLC, 2013-11-01)
The OPERA neutrino experiment is designed to perform the first observation of neutrino oscillations in direct appearance mode in the nu(mu) -> nu(tau) channel, via the detection of the tau-leptons created in charged current nu(tau) 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 me...
Study of electron identification in the opera detector
Bay, M. Fatih; Güler, Ali Murat; Department of Physics (2008)
The OPERA experiment is designed to perform first direct observation of $\nu_{\tau}$ appearance in an almost pure $\nu_{\mu}$ beam. The OPERA detector is a hybrid set-up which combines a lead/emulsion target with various electronic detectors. It is located in Gran Sasso Laboratory (LNGS), 730 km away from CERN where neutrino beam is produced. A good electron identification in the ECC brick would also allow OPERA to search for $\nu_{\mu}\rightarrow\nu_{e}$ oscillations. We have studied electron identificatio...
Citation Formats
M. Kamışcıoğlu, “More Results from the Opera Experiment at the Gran Sasso Underground Lab,” 2017, vol. 46, Accessed: 00, 2020. [Online]. Available: