Erratum: new results on ν μ → ν τ appearance with the OPERA experiment in the CNGS beam

Agafonova, N.; Aleksandrov, A.; Anokhina, A.; Aoki, S.; Ariga, A.; Ariga, T.; Asada, Takashi; Autiero, D.; Badertscher, A.; Dhahbi, Anis Ben; Bender, D.; Bertolin, A.; Bozza, C.; Brugnera, R.; Brunetti, G.; Büttner, B.; Buontempo, S.; Chaussard, L.; Chernyavskiy, M.; Chiarella, V.; Chukanov, A.; Consiglio, L.; D’Ambrosio, N.; Sanchez, P. del Amo; Lellis, G. De; Serio, M. De; Crescenzo, A. Di; Ferdinando, D. Di; Marco, N. Di; Dmitrievski, S.; Dracos, M.; Duchesneau, D.; Dusini, S.; Ebert, J.; Ereditato, A.; Favier, Jean; Ferber, T.; Fini, R. A.; Fukuda, Tsutomu; Garfagnini, A.; Giacomelli, G.; Goellnitz, C.; Goldberg, J.; Gornushkin, Y.; Grella, G.; Grianti, F.; Guler, A. M.; Gustavino, C.; Hagner, C.; Hakamata, K.; Hara, T.; Hayakawa, Tomokatsu; Hierholzer, M.; Hollnagel, A.; Hosseini, B.; Ishida, Hirokazu; Ishiguro, K.; Ishikawa, Masahiro; Jakovčić, K.; Jollet, C.; Kamiscioglu, C.; Kamiscioglu, M.; Katsuragawa, Taishi; Kawahara, H.; Kawada, J.; Kim, J. H.; Kim, S. H.; Kimura, Mitsuhiro; Kitagawa, N.; Kliček, B.; Kodama, K.; Komatsu, M.; Köse, U.; Kreslo, I.; Lauria, A.; Lenkeit, J.; Ljubičić, A.; Longhin, A.; Loverre, P.; Malgin, A. S.; Mandrioli, G.; Marteau, J.; Matsuo, T.; Matveev, V.; Mauri, N.; Medinaceli, E.; Meregaglia, A.; Migliozzi, P.; Mikado, S.; Minotti, A.; Miyanishi, M.; Miyashita, E.; Monacelli, P.; Montesi, M.C.; Morishima, Keisuke; Muciaccia, M. T.; Naganawa, N.; Naka, Takashi; Nakamura, Mitsuhiro; Nakano, T.; Nakatsuka, Y.; Niwa, K.; Ogawa, S.; Okateva, N.; Оlshevsky, А.G.; Omura, T.; Ozaki, K.; Paoloni, A.; Park, B. D.; Park, I. G.; Pastore, Alessandro; Patrizii, L.; Pennacchio, E.; Pessard, H.; Pistillo, C.; Подгрудков, Д.; Polukhina, N.; Pozzato, M.; Pretzl, K.; Pupilli, F.; Rescigno, R.; Roda, M.; Роганова, Т. М.; Rokujo, H.; Rosa, G.; Rostovtseva, I.; Rubbia, A.; Russo, A.; Ryazhskaya, O. G.; Sato, Osamu; Sato, Yoshihiro; Schembri, Adam; Schmidt‐Parzefall, W.; Shakiryanova, I.; Schcedrina, T.; Sheshukov, A.; Shibuya, H.; Shiraishi, Takeshi; Shoziyoev, G.; Simone, S.; Sioli, M.; Sirignano, C.; Sirri, G.; Spinetti, M.; Stančo, L.; Starkov, N.; Stellacci, Simona Maria; Stipčević, M.; Strauss, T.; Strolin, P.; Suzuki, K.; Takahashi, Satoru; Tenti, M.; Terranova, F.; Tioukov, V.; Tolun, P.; Tufanli, S.; Vilain, P.; Vladimirov, M. S.; Votano, L.; Vuilleumier, J. L.; Wilquet, G.; Wonsak, B.; Yoon, C. S.; Yoshida, J.; Yoshimoto, Masahiro; Zaitsev, Yu.; Zemskova, S.; Zghiche, A.

doi:10.1007/jhep04(2014)014

Cited by 7 publications

(8 citation statements)

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“…The new analysis is based on a multivariate approach for event identification, fully exploiting the expected features of ν τ events, rather than on the sheer selection of candidate events by independent cuts on topological or kinematical parameters, as in previous analyses. It is performed on candidate events preselected with looser cuts than those applied in the previous cut-based approach [6,[8][9][10][11]. Looser cuts increase the number of ν τ candidates, thus leading to a measurement of the oscillation parameters and of the ν τ cross section with a reduced statistical uncertainty.…”

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confidence: 99%

“…The rectangular cuts on the topological and kinematical variables, shown in Table II, are looser than those used in previous papers [6,[8][9][10][11]. Current criteria correspond to the minimal requirements to identify the topologies showing two vertices.…”

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confidence: 99%

“…As input for the BDT analysis, additional kinematical variables have been used. As described in [9], they are the missing transverse momentum with respect to the incoming neutrino direction (p T miss ), the transverse opening angle between the τ candidate and the hadronic system (ϕ lH ), and the invariant mass of the parent particle (m). In addition, for the τ → μ channel, the charge measurement status [16] of the daughter muon (negative or unknown) is also used.…”

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confidence: 99%

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Final Results of the OPERA Experiment on ντ Appearance in the CNGS Neutrino Beam

Agafonova¹,

Alexandrov²,

Anokhina³

et al. 2018

Phys. Rev. Lett.

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102

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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. A multivariate approach for event identification has been applied to the candidate events and the discovery of ν_{τ} appearance is confirmed with an improved significance level of 6.1σ. |Δm_{32}^{2}| has been measured, in appearance mode, with an accuracy of 20%. The measurement of the ν_{τ} charged-current cross section, for the first time with a negligible contamination from ν[over ¯]_{τ}, and the first direct evidence for the ν_{τ} lepton number are also reported.

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confidence: 99%

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confidence: 99%

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confidence: 99%

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Final Results of the OPERA Experiment on ντ Appearance in the CNGS Neutrino Beam

Agafonova¹,

Alexandrov²,

Anokhina³

et al. 2018

Phys. Rev. Lett.

Self Cite

102

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“…At the same time there was no evidence of distortions in the ν e -induced electron-like (e-like) flux. For this reason the muon disappearance has been attributed to ν → μ ν τ oscillations, where the ν τ often goes undetected due to the high production threshold of the τ; atmospheric neutrino oscillations are now known to be dominated by this mode [27,28]. This phenomena can be illustrated using the muon neutrino survival probability assuming two-flavor mixing: where Δm 2 is the squared difference in the two neutrino masses, ν E and L are the neutrino energy and flight length, respectively.…”

Section: General Features Of Atmospheric Neutrinosmentioning

confidence: 99%

“…Due to the inconsistency of the Super-K data with the disappearance of the muon flux purely into unseen sterile neutrinos via ν → μ ν s oscillations [48] and the preference of global data for oscillation into ν τ , direct searches [28] for oscillation-induced ν τ events are a critical component of verifying the standard mixing paradigm. Assuming oscillations with Δm 32 2 = 2.4 × 10 −3 eV 2 , the expected CC ν τ interaction rate within Super-K is roughly ∼1 − − kton yr 1 1 due to the 3.5 GeV production threshold of the τ.…”

Section: Measurements At Super-kamiokandementioning

confidence: 99%

Recent progress and future prospects with atmospheric neutrinos

Wendell

Okumura

2015

New J. Phys.

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The large range of energies and pathlengths spanned by atmospheric neutrinos have made them a useful tool in the discovery and subsequent study of neutrino oscillations. With the recent measurement of the θ 13 mixing angle, though it is now known that all mixing angles and mass differences in the PMNS oscillation framework are non-zero, several open questions, including the nature of the neutrino mass hierarchy, the value of the θ 23 octant, and whether or not neutrinos violate charge-parity symmetry, remain. As atmospheric neutrinos are capable of addressing these issues as well as those from more exotic models, the importance of their continued role in neutrino physics is clear. Accordingly, this work reviews recent progress in the study of atmospheric neutrinos, including oscillation and flux measurements from ongoing experiments, and reports on future prospects for next-generation detectors.

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Recent results of the OPERA experiment

Pupilli¹

2016

AIP Conference Proceedings

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The OPERA experiment aims at the direct confirmation of the leading oscillation mechanism in the atmospheric sector looking for the appearance of ντ in an almost pure νµ beam (the CERN CNGS beam). In five years of physics run the experiment collected 17.97 × 10 19 p.o.t. The detection of τ s produced in ντ CC interactions and of their decays is accomplished exploiting the high spatial resolution of nuclear emulsions. Furthermore OPERA has good capabilities in detecting electron neutrino interactions, setting limits on the νµ → νe oscillation channel. In this talk the status of the analysis will be presented together with updated results on both oscillation channels.

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Erratum: new results on ν μ → ν τ appearance with the OPERA experiment in the CNGS beam

Cited by 7 publications

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Final Results of the OPERA Experiment on ντ Appearance in the CNGS Neutrino Beam

Final Results of the OPERA Experiment on ντ Appearance in the CNGS Neutrino Beam

Recent progress and future prospects with atmospheric neutrinos

Recent results of the OPERA experiment

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