Abstract

In spring 2012 CERN provided two weeks of a short bunch proton beam dedicated to the neutrino velocity measurement over a distance of 730 km. The OPERA neutrino experiment at the underground Gran Sasso Laboratory used an upgraded setup compared to the 2011 measurements, improving the measurement time accuracy. An independent timing system based on the Resistive Plate Chambers was exploited providing a time accuracy of similar to 1 ns. Neutrino and anti-neutrino contribution were separated using the information provided by the OPERA magnetic spectrometers. The new analysis profited from the precision geodesy measurements of the neutrino beaseline and of the CNGS/LNGS clock synchronization. The neutrino arrival time with respect to the one computed assuming the speed of light in vacuum is found to be delta t(nu) equivalent to TOFc - TOF nu = (0.6 +/- 0.4 (stat.)+/- 3.0 (syst.)) and delta t((nu) over bar) equivalent to TOFc-TOF(nu) over bar = (1.7 +/- 1.4 (stat.)+/- 3.1 (syst.)) ns for nu(mu) and (nu) over bar (mu), respectively. This corresponds to a limit on the muon neutrino velocity with respect to the speed of light of -1.8 x 10(-6) < (V-nu - c)/c < 2.3 x 10(-6) at 90% C.L. This new measurement confirms with higher accuracy the revised OPERA result.

Autore Pugliese

• De Serio Marilisa , Simone Saverio

Tutti gli autori

• DE SERIO M.;SIMONE S.

Titolo volume/Rivista

Non Disponibile

Anno di pubblicazione

2013

ISSN

1029-8479

ISBN

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Numero di citazioni Wos

4

Ultimo Aggiornamento Citazioni

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Numero di citazioni Scopus

10

Ultimo Aggiornamento Citazioni

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Settori ERC

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Codici ASJC

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