| 1. |
- Edgecock, T. R., et al.
(author)
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High intensity neutrino oscillation facilities in Europe
- 2013
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In: Physical Review Special Topics - Accelerators and Beams. - : American Physical Society. - 1098-4402. ; 16:2, s. 021002-
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Journal article (peer-reviewed)abstract
- The EUROnu project has studied three possible options for future, high intensity neutrino oscillation facilities in Europe. The first is a Super Beam, in which the neutrinos come from the decay of pions created by bombarding targets with a 4 MW proton beam from the CERN High Power Superconducting Proton Linac. The far detector for this facility is the 500 kt MEMPHYS water Cherenkov, located in the Frejus tunnel. The second facility is the Neutrino Factory, in which the neutrinos come from the decay of mu(+) and mu(-) beams in a storage ring. The far detector in this case is a 100 kt magnetized iron neutrino detector at a baseline of 2000 km. The third option is a Beta Beam, in which the neutrinos come from the decay of beta emitting isotopes, in particular He-6 and Ne-18, also stored in a ring. The far detector is also the MEMPHYS detector in the Frejus tunnel. EUROnu has undertaken conceptual designs of these facilities and studied the performance of the detectors. Based on this, it has determined the physics reach of each facility, in particular for the measurement of CP violation in the lepton sector, and estimated the cost of construction. These have demonstrated that the best facility to build is the Neutrino Factory. However, if a powerful proton driver is constructed for another purpose or if the MEMPHYS detector is built for astroparticle physics, the Super Beam also becomes very attractive.
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| 2. |
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| 3. |
- Agarwalla, S.K., et al.
(author)
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EUROnu-WP6 2010 Report
- 2012
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Reports (other academic/artistic)abstract
- This is a summary of the work done by the Working Package 6 (Physics) of the EU project "EUROnu" during the second year of activity of the project.
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| 4. |
- Blennow, Mattias, et al.
(author)
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Determination of the neutrino mass ordering by combining PINGU and Daya Bay II
- 2013
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In: Journal of High Energy Physics (JHEP). - 1126-6708 .- 1029-8479. ; 2013:9, s. 089-
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Journal article (peer-reviewed)abstract
- The relatively large measured value of θ 13 has opened various possibilities to determine the neutrino mass ordering, among them using PINGU, the low-energy extension of the IceCube neutrino telescope, to observe matter effects in atmospheric neutrinos, or a high statistics measurement of the neutrino energy spectrum at a reactor neutrino experiment with a baseline of around 60 km, such as the Daya Bay II project. In this work we point out a synergy between these two approaches based on the fact that when data are analysed with the wrong neutrino mass ordering the best fit occurs at different values of varDelta m 312 for PINGU and Daya Bay II. Hence, the wrong mass ordering can be excluded by a mismatch of the values inferred for varDelta m 312, thanks to the excellent accuracy for varDelta m 312 of both experiments. We perform numerical studies of PINGU and Daya Bay II sensitivities and show that the synergy effect may lead to a high significance determination of the mass ordering even in situations where the 3individual experiments obtain only poor sensitivity.
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| 5. |
- Blennow, Mattias, 1980-, et al.
(author)
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Sensitivity of oscillation experiments to the neutrino mass hierarchy
- 2014
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In: Proceedings of the 49th Rencontres de Moriond - 2014 Electroweak Interactions and Unified Theories, EW 2014. - : ARISF. - 9782954640037 ; , s. 121-128
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Conference paper (peer-reviewed)abstract
- The large value of θ13 recently discovered at reactor neutrino experiments has opened the door to determine the ordering of their mass eigenstates in the near future. However, since the neutrino mass ordering is a discrete parameter it is not clear whether the median sensitivity of a given experiment would coincide with the usual values reported in the literature. In this talk we present a summary of the different possibilities to determine the neutrino mass ordering in the near future, and we briefly discuss the statistical issues related to the significance of the signal for this measurement.
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| 6. |
- Feix, M., et al.
(author)
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Post-inflationary axion isocurvature perturbations facing CMB and large-scale structure
- 2020
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In: Journal of Cosmology and Astroparticle Physics. - : IOP Publishing. - 1475-7516. ; :11
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Journal article (peer-reviewed)abstract
- Dark matter comprised of axion-like particles (ALPs) generated by the realignment mechanism in the post-inflationary scenario leads to primordial isocurvature fluctuations. The power spectrum of these fluctuations is flat for small wave numbers, extending to scales accessible with cosmological surveys. We use the latest measurements of Cosmic Microwave Background (CMB) primary anisotropies (temperature, polarization) together with CMB lensing, Baryonic Acoustic Oscillations (BAO) and Sunyaev Zel'dovich (SZ) cluster counts to measure the amplitude and tilt of the isocurvature component. We find preference for a white-noise isocurvature component in the CMB primary anisotropies; this conclusion is, however, weakened by current large-scale structure (LSS) data. Interpreting the result as a conservative upper limit on the isocurvature component, the combined bound on the ALP mass from all probes is m(a) greater than or similar to 10(-19) eV, with some dependence on how m(a) evolves with temperature. The expected sensitivity of cosmic shear and galaxy clustering from future LSS experiments and CMB lensing suggests improved bounds of m(a) greater than or similar to 10(-18) -10(-13) eV, depending on scale cuts used to avoid non-linearities and the ALP mass-temperature dependence.
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