Publications by Monireh Kabirnezhad


Upper bound on neutrino mass based on T2K neutrino timing measurements

Physical Review D American Physical Society 93 (2016) ARTN 012006-

AC Kaboth, T Kajita, H Kakuno, J Kameda, Y Kanazawa, D Karlen, I Karpikov, T Katori, E Kearns, M Khabibullin, A Khotjantsev, D Kielczewska, T Kikawa, A Kilinski, J Kisiel, P Kitching, T Kobayashi, L Koch, T Koga, A Kolaceke, Y Koshio, W Kropp, R Kurjata, M Laveder, RP Litchfield

The Tokai to Kamioka (T2K) long-baseline neutrino experiment consists of a muon neutrino beam, produced at the J-PARC accelerator, a near detector complex and a large 295-km-distant far detector. The present work utilizes the T2K event timing measurements at the near and far detectors to study neutrino time of flight as a function of derived neutrino energy. Under the assumption of a relativistic relation between energy and time of flight, constraints on the neutrino rest mass can be derived. The sub-GeV neutrino beam in conjunction with timing precision of order tens of ns provide sensitivity to neutrino mass in the few MeV/c2 range. We study the distribution of relative arrival times of muon and electron neutrino candidate events at the T2K far detector as a function of neutrino energy. The 90% C.L. upper limit on the mixture of neutrino mass eigenstates represented in the data sample is found to be m2ν<5.6 MeV2/c4.


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