Updated results from the ντ appearance search in NOMAD

Astier, P.; Autiero, D.; Baldisseri, A.; Baldo‐Ceolin, M.; Ballocchi, G.; Banner, M.; Bassompierre, G.; Benslama, K.; Besson, N.; Bird, I.; Blumenfeld, B.; Bobisut, F.; Bouchez, J.; Boyd, S.; Bueno, A.; Bunyatov, S.A.; Camilleri, L.; Cardini, A.; Cattaneo, P. W.; Cavasinni, V.; Cervera-Villanueva, A.; Collazuol, G.; Conforto, G.; Conta, C.; Contalbrigo, M.; Cousins, R.; Daniels, D.; Degaudenzi, H.; Prete, T. Del; Santo, A. De; Dignan, T.; Lella, L. Di; Silva, E. do Couto e; Dumarchez, J.; Ellis, M.; Feldman, G. J.; Ferrari, R.; Ferrère, D.; Flaminio, V.; Fraternali, M.; Gaillard, J.M.; Gangler, É.; Geiser, A.; Geppert, D.; Gibin, D.; Gninenko, S.; Godley, A.; Gómez-Cadenas, J. J.; Gösset, J.; Gößling, C.; Gouanère, M.; Grant, A.; Graziani, G.; Guglielmi, A.; Hagner, C.; Hernando, J. A.; Hubbard, D.; Hurst, P.; Hyett, Nicole; Iacopini, E.; Joseph, C.; Juget, F.; Kirsanov, M.; Klimov, O.; Kokkonen, J.; Kovzelev, A.; Krasnoperov, A.; Кузнецов, В. Е.; Lacaprara, S.; Lachaud, C.; Lakić, B.; Lanza, A.; Rotonda, L. La; Laveder, M.; Letessier‐Selvon, A.; Lévy, J. M.; Linssen, L.; Ljubičić, A.; Long, J.; Lupi, A.; Marchionni, A.; Martelli, F.; Méchain, X.; Mendiburu, J. P.; Meyer, J.; Mezzetto, M.; Mishra, S. R.; Moorhead, G. F.; Nédélec, P.; Nefedov, Y.; Nguyen-Mau, C.; Orestano, D.; Pastore, F.; Peak, L. S.; Pennacchio, E.; Pessard, H.; Petti, R.; Placci, A.; Polesello, G.; Pollmann, D.; Polyarush, A. Yu.; Popov, Б.; Poulsen, C.; Rebuffi, Luca; Rico, J.; Roda, C.; Rubbia, A.; Salvatore, F.; Schahmanèche, K.; Schmidt, B.; Sevior, M. E.; Sillou, D.; Soler, F. J. P.; Sozzi, G.; Steele, D.; Steininger, M.; Stiegler, U.; Stipčević, M.; Stolarczyk, Th.; Tareb-Reyes, M.; Taylor, G. N.; Терещенко, В.; Toropin, A.; Touchard, A. M.; Tovey, S. N.; Trân, M. T.; Tsesmelis, E.; Ulrichs, J.; Vacavant, L.; Valdata‐Nappi, M.; Valuev, V.; Vannucci, F.; Varvell, K. E.; Veltri, M.; Vercesi, V.; Vieira, J.-M.; Vinogradova, T.; Weber, F. V.; Weisse, Thomas; Wilson, F. F.; Winton, L.J.; Yabsley, B.; Zaccone, H.; Zuber, Κ.; Zuccon, P.

doi:10.1016/s0370-2693(00)00611-0

Cited by 21 publications

(10 citation statements)

References 16 publications

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“…We conclude that the detection of L ∝ E −2 dependence in neutrino oscillations would constitute strong evidence against critical string theory, in which the in an oscillation length of about 10 −3 AU. These estimates suggests that if the mixing is close to maximal mixing sin 2 (2θ) = 1, then previous neutrino oscillation experiments CHORUS [20] and NOMAD [21], and the currently operating experiments SK [18], K2K [22], and SNO [23], are already able to detect the proposed effect if S A,B is larger than about 10 −2 . In this context, the existing data must be interpreted as a null result, S A,B less than about 10 −2 , or very small mixing sin 2 (2θ) ≪ 1 or both, accordingly to equation (2), as the analysis of the energy dependence of the oscillation length of SK data shows that the observed oscillation is due to mass mixing L ∝ E, rather than to LIV terms [19].…”

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confidence: 80%

Probing the Planck scale with neutrino oscillations

2002

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Quantum gravity "foam", among its various generic Lorentz non-invariant effects, would cause neutrino mixing. It is shown here that, if the foam is manifested as a nonrenormalizable effect at scale M , the oscillation length generically decreases with energy E as (E/M ) −2 . Neutrino observatories and long-baseline experiments should have therefore already observed foam-induced oscillations, even if M is as high as the Planck energy scale. The null results, which can be further strengthened by better analysis of current data and future experiments, can be taken as experimental evidence that Lorentz invariance is fully preserved at the Planck scale, as is the case in critical string theory.The noisy vacuum of a quantum theory of gravity could _ a priori be imagined to have a variety of effects on the wavefunction of a particle traveling through it. Although unitarity would probably constrain the effects of the vacuum on the wavefunction's amplitude, one could imagine that its phase might be shifted by the local effects of quantum black holes and the like which quickly pop in and out of the vacuum. Also, the type (flavor) of the particle might be affected: for example, a virtual or quantum black hole could as Hawking has suggested [1], erase information by swallowing a neutrino of one type and spit out one of a different type as it evaporates. Thus, possible effects that could be considered include Lorentz invariance violating (LIV) indices of refraction [2,3,4], flavor oscillations of neutral particles [5,6,7,8,9], and corrugations of wavefronts, i.e. Rayleigh scattering [8]. Rayleigh scattering, which would imply momentum non-conservation, appears to be ruled out by the observation that 10 MeV neutrinos propagated without Rayleigh scattering from supernova 1987A [8] (assuming that their scattering cross-section off cells of Planck foam scales as E 2). We conclude that if such "foam" effects exist, they must preserve translation invariance on the Planck distance scale and on larger ones; thus any non-vanishing effects must be cooperative and coherent over space-like distances in this range of scales; it may cause wave dispersion but not opalescence or translucence.

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confidence: 80%

Probing the Planck scale with neutrino oscillations

2002

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“…The present upper limit on ν µ → ν τ neutrino oscillations obtained in the NOMAD experiment [17] is stronger than the one obtained in the CHORUS experiment [18] not because the NOMAD experiment has a better sensitivity than the CHORUS experiment (see discussion in [18]), but because the NOMAD collaboration uses the Unified Approach, which gives unphysically stringent upper bounds when the number of observed events is smaller than the expected background.…”

Section: Other Infamous Examplesmentioning

confidence: 79%

Statistical analysis of solar neutrino data

Garzelli

Giunti

2001

Nuclear Physics B - Proceedings Supplements

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We calculate with Monte Carlo the goodness of fit and the confidence level of the standard allowed regions for the neutrino oscillation parameters obtained from the fit of the total rates measured in solar neutrino experiments. We show that they are significantly overestimated in the standard method. We also calculate exact allowed regions with correct frequentist coverage. We show that the exact VO, LMA and LOW regions are much larger than the standard ones and merge together giving an allowed band at large mixing angles for all ∆m 2 10 −10 eV 2 .

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“…The search for ] → ] oscillations was based on both deep inelastic (DIS) interactions and low-multiplicity (LM) events for all the accessible decay channels. Details are to be found in [10][11][12][13]. The two samples were separated by a cut on the total hadronic momentum at 1.5 GeV/c.…”

Section: Results On the ] → ] Oscillationmentioning

confidence: 99%

The NOMAD Experiment at CERN

Vannucci

2014

Advances in High Energy Physics

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The purpose of this paper is to review the experimental apparatus and some physics results from the NOMAD (neutrino oscillation magnetic detector) experiment which took data in the CERN wide-band neutrino beam from 1995 to 1998. It collected and reconstructed more than one million charged current (CC)νμevents with an accuracy which was previously obtained only with bubble chambers. The main aim of the experiment was to search for the oscillationνμintoντ, in a region of mass compatible with the prescriptions of the hot dark matter hypothesis, which predicted aντmass in the range of 1–10 eV/c2. This was done by searching forντCC interactions, observing the production of theτlepton through its various decay modes by using kinematical criteria. In parallel, NOMAD also strongly contributed to the study of more conventional processes: quasielastic events, strangeness production and charm dimuon production, single photon production, and coherent neutral pion production. Exotic searches were also investigated. The paper reviews the neutrino beam, the detector setup, the detector performances, the neutrino oscillation results, the strangeness production, the dimuon charm production, and summarizes other pieces of research.

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Updated results from the ντ appearance search in NOMAD

Cited by 21 publications

References 16 publications

Probing the Planck scale with neutrino oscillations

Probing the Planck scale with neutrino oscillations

Statistical analysis of solar neutrino data

The NOMAD Experiment at CERN

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