A study of atmospheric neutrino oscillations in the Fréjus experiment
Ch. BergerMatthias FröhlichH. MönchR. NisiusF. RaupachD. BlumC. BourdariosB. DudelzakP. EschstruthS. JullianD. LalanneF. LaplancheC. LonguemareC. PaulotO. PerdereauPhilippe RoyG. SzklarzL. BehrB. DegrangeU. Nguyen-KhacS. TisserantC. ArpesellaP. BareyeR. BarloutaudA. BorgG. ChardinJ. ErnweinJ. F. GlicensteinL. MoscaL. MoscosoJ. A. BeckerK.-H. BeckerH.J. DaumB. JacobiB. KuznikH. MeyerR. MøllerM. SchubnellY. Wei
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The Tokai-to-Kamioka (T2K) long-baseline neutrino-oscillation experiment is being prepared for start of operations in Fall 2009. The purpose of T2K is to measure the oscillation parameters from an intense muon neutrino beam. In order to make precision measurements of muon neutrino disappearence a new detector complex (ND280) will be used to identify the profile and composition of the neutrino beam near its production site. ND280 will also be used to study important background processes in the measurement of an electron neutrino appearance signal at Super-K. We will describe the physics goals and technology choices of ND280.
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A bstract 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 π 0 s, thus allowing the detection of charged current interactions of electron neutrinos. In this paper the results of the search for electron neutrino events using the full dataset are reported. An improved method for the electron neutrino energy estimation is exploited. Data are compatible with the 3 neutrino flavour mixing model expectations and are used to set limits on the oscillation parameters of the 3+1 neutrino mixing model, in which an additional mass eigenstate m 4 is introduced. At high Δ m 41 2 (≳0.1 eV 2 ), an upper limit on sin 2 2 θ μe is set to 0.021 at 90% C.L. and Δ m 41 2 ≳ 4 × 10 − 3 eV 2 is excluded for maximal mixing in appearance mode.
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Abstract T2K is a long-baseline neutrino oscillation experiment built to measure ν μ disappearance and ν e appearance using the J-PARC neutrino beam and the Super-Kamiokande detector. Presented here are the first results in the search for CP violation in neutrino oscillations with a combined analysis of appearance and disappearance channels using data from both neutrino- and antineutrino-mode beams. The data included in this analysis comprises 7.48×10 20 protons on target in neutrino mode, giving 37 electron-like and 135 muon-like events at the far detector, and 7.47 × 10 20 protons on target in antineutrino mode, giving 4 electron-like and 66 muon-like events. Including a constraint on sin 2 (2θ 13 ) from reactor measurements, the 90% confidence interval for δ CP spans the range [-2.95, -0.44] for the normal mass hierarchy.
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The T2K long baseline neutrino oscillation experiment measures muon neutrino disappearance and electron neutrino appearance in accelerator-produced neutrino and anti-neutrino beams. This presentation reports on the analysis of our data from an exposure of 2.6 × 10 21 protons on target. Results for oscillation parameters, including the CP violation parameter and neutrino mass ordering, are shown.
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There is now substantial evidence that the proper description of neutrino involves two representations related by the 3 x 3 PMNS matrix characterized by either distinct mass or flavor. The parameters of this mixing matrix, three angles and a phase, as well as the mass differences between the three mass eigenstates must be determined experimentally. The Main Injector Neutrino Oscillation Search experiment is designed to study the flavor composition of a beam of muon neutrinos as it travels between the Near Detector at Fermi National Accelerator Laboratory at 1 km from the target, and the Far Detector in the Soudan iron mine in Minnesota at 735 km from the target. From the comparison of reconstructed neutrino energy spectra at the near and far location, precise measurements of neutrino oscillation parameters from muon neutrino disappearance and electron neutrino appearance are expected. It is very important to know the neutrino flux coming from the source in order to achieve the main goal of the MINOS experiment: precise measurements of the atmospheric mass splitting |Δm232|, sin2 θ23. The goal of my thesis is to accurately predict the neutrino flux for the MINOS experiment and measure the neutrino mixing angle and atmospheric mass splitting.
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MINOS is a long-baseline neutrino oscillation experiment situated along Fermilab's high-intensity NuMI neutrino beam. MINOS has completed an updated search for muon neutrino to electron neutrino transitions, observation of which would indicate a non-zero value for the neutrino mixing angle {theta}{sub 13}. The present 7 x 10{sup 20} protons-on-target data set represents more than double the exposure used in the previous analysis. The new result and its implications are presented.
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Neutrino flavor oscillations are discussed in terms of an explicit model. This model consists of two coupled Dirac equations with three parameters: the electron neutrino mass, the muon neutrino mass, and a coefficient which describes the possibility that the neutrino can flip flavor. The system is diagonalized to obtain the exact eigenvalues and eigenfunctions. The system is then quantized and the neutrino flavor wave functions are derived directly from the quantized fields. It is shown that neutrino flavor oscillation probabilities are recovered in a quantum field theory treatment only in the ultrarelativistic limit.
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The MINOS experiment made precision measurements of the neutrino oscillation parameters that are governed by the atmospheric mass-squared splitting. These measurements were made with data that were collected while the NuMI muon neutrino beam operated in a low energy mode that peaks around 3 GeV. Today the NuMI beam is running with a higher energy mode that produces a neutrino energy spectrum that peaks around 7 GeV, allowing the MINOS+ experiment to probe neutrino oscillation phenomena that could potentially be governed by a fourth mass-squared splitting. If observed, the presence of a fourth mass-squared splitting would be compelling evidence for a sterile neutrino state. In this analysis, we will present the results of a search for νµ → νe oscillation mediated by sterile neutrinos in MINOS+. The results will be contrasted against the measurements made by the LSND experiment.
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The OPERA experiment has conclusively observed the appearance of tau neutrinos in the muon neutrino CNGS beam. High purity samples of $\nu_e$, $\nu_\mu$ and $\nu_\tau$ charged current neutrino interactions, as well as neutral current interactions were isolated. Recent results obtained using the full dataset to test the three-flavor neutrino oscillation model are discussed. Constraints on the existence of a light sterile neutrino, derived using for the first time tau and electron neutrino appearance channels, are also presented. A significant fraction of the sterile neutrino parameter space allowed by LSND and MiniBooNE experiments is excluded at 90$\%$ C.L. In particular, the best-fit oscillation parameter values obtained by MiniBooNE are excluded at 3.3 $\sigma$ significance.
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MINOS is a long-baseline neutrino oscillation experiment situated along Fermilab's highintensity NuMI neutrino beam.MINOS has completed an updated search for muon neutrino to electron neutrino transitions, observation of which would indicate a non-zero value for the neutrino mixing angle θ 13 .The present 7 × 10 20 protons-on-target data set represents more than double the exposure used in the previous analysis.The new result and its implications are presented.
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