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Deutsche Physikalische Gessellschaft IOP Institute of Physics

First events from the CNGS neutrino beam detected in the OPERA experiment

R Acquafredda1, N Agafonova2, M Ambrosio1, A Anokhina3, S Aoki4, A Ariga5, L Arrabito6, D Autiero6, A Badertscher7, E Baussan28, A Bergnoli8, F Bersani Greggio9, M Besnier10, M Beyer11, S Bondil-Blin12, K Borer13, J Boucrot12, V Boyarkin2, C Bozza14, R Brugnera8, S Buontempo1, Y Caffari6, J E Campagne12, B Carlus6, E Carrara8, A Cazes9, L Chaussard6, M Chernyavsky15, V Chiarella9, N Chon-Sen16, A Chukanov17, R Ciesielski8, L Consiglio18, M Cozzi18, F Dal Corso8, N D'Ambrosio19, J Damet10, G De Lellis1, Y Déclais6, T Descombes6, M De Serio20, F Di Capua1, D Di Ferdinando18, A Di Giovanni21, N Di Marco21, C Di Troia9, S Dmitrievski17, M Dracos16, D Duchesneau10, B Dulach9, S Dusini8, J Ebert22, R Enikeev2, A Ereditato13, L S Esposito19, C Fanin8, J Favier10, G Felici9, T Ferber22, L Fournier10, A Franceschi9, D Frekers23, T Fukuda5, C Fukushima24, V I Galkin3, V A Galkin25, R Gallet10, A Garfagnini8, G Gaudiot16, G Giacomelli18, O Giarmana6, M Giorgini18, L Girard6, C Girerd6, C Goellnitz22, J Goldberg26, Y Gornoushkin17, G Grella14, F Grianti9, C Guerin6, M Guler27, C Gustavino19, C Hagner22, T Hamane10, T Hara4, M Hauger28, M Hess13, K Hoshino5, M Ieva20, M Incurvati9, K Jakovcic29, J Janicsko Csathy28, B Janutta22, C Jollet16, F Juget28, M Kazuyama5, S H Kim30, M Kimura24, J Knuesel13, K Kodama31, D Kolev32, M Komatsu5, U Kose27, A Krasnoperov17, I Kreslo13, Z Krumstein17, I Laktineh6, C de La Taille12, T Le Flour10, S Lieunard10, A Ljubicic29, A Longhin8, A Malgin2, K Manai33, G Mandrioli18, U Mantello8, A Marotta1, J Marteau6, G Martin-Chassard12, V Matveev2, M Messina13, L Meyer13, S Micanovic29, P Migliozzi1, S Miyamoto5, P Monacelli21, I Monteiro10, K Morishima5, U Moser13, M T Muciaccia20, P Mugnier10, N Naganawa5, M Nakamura5, T Nakano5, T Napolitano9, M Natsume5, K Niwa5, Y Nonoyama5, A Nozdrin17, S Ogawa24, A Olchevski17, D Orlandi19, D Ossetski25, A Paoloni9, B D Park5, I G Park30, A Pastore20, L Patrizii18, L Pellegrino9, H Pessard10, V Pilipenko23, C Pistillo13, N Polukhina15, M Pozzato18, K Pretzl13, P Publichenko3, L Raux12, J P Repellin12, T Roganova3, G Romano14, G Rosa34, A Rubbia7, V Ryasny2, O Ryazhskaya2, D Ryzhikov25, A Sadovski17, C Sanelli9, O Sato5, Y Sato35, V Saveliev25, N Savvinov13, G Sazhina3, A Schembri34, W Schmidt Parzefall22, H Schroeder11, H U Schütz13, L Scotto Lavina1, J Sewing22, H Shibuya24, S Simone20, M Sioli18, C Sirignano14, G Sirri18, J S Song30, R Spaeti13, M Spinetti9, L Stanco8, N Starkov15, M Stipcevic29, P Strolin1, V Sugonyaev8, S Takahashi5, V Tereschenko17, F Terranova9, I Tezuka35, V Tioukov1, I Tikhomirov36, P Tolun27, T Toshito5, V Tsarev15, R Tsenov32, U Ugolino1, N Ushida31, G Van Beek37, V Verguilov32, P Vilain37, L Votano9, J L Vuilleumier28, T Waelchli13, R Waldi11, M Weber13, G Wilquet37, B Wonsak22, R Wurth11, J Wurtz16, V Yakushev2, C S Yoon30, Y Zaitsev36, I Zamboni29 and R Zimmermann22

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The OPERA neutrino detector at the underground Gran Sasso Laboratory (LNGS) was designed to perform the first detection of neutrino oscillations in appearance mode, through the study of νμ → ντ oscillations. The apparatus consists of a lead/emulsion-film target complemented by electronic detectors. It is placed in the high-energy, long-baseline CERN to LNGS beam (CNGS) 730 km away from the neutrino source. In August 2006, a first run with CNGS neutrinos was successfully conducted. A first sample of neutrino events was collected, statistically consistent with the integrated beam intensity. After a brief description of the beam and of the various sub-detectors, we report on the achievement of this milestone, presenting the first data and some analysis results.


PACS

14.60.Lm Ordinary neutrinos (nue, numu, nutau)

96.50.sb Composition, energy spectra and interactions

29.40.-n Radiation detectors

13.15.+g Neutrino interactions

96.60.Jw Solar interior

96.60.Vg Particle emission, solar wind

Subjects

Accelerators, beams and electromagnetism

Nuclear physics

Instrumentation and measurement

Particle physics and field theory

Astrophysics and astroparticles

Dates

Issue 12 (December 2006)

Received 13 September 2006

Published 5 December 2006



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