Resolving Standard and Nonstandard CP Violation Phases in Neutrino Oscillations
Neutrino oscillations can exhibit extra CP violation effects, beyond those expected from the standard Kobayashi‐Maskawa phase δ, if non‐standard neutrino interactions are at play. We show that it is possible...
Año de publicación: 2010
Neutrino oscillations can exhibit extra CP violation effects, beyond those expected from the standard Kobayashi‐Maskawa phase δ, if non‐standard neutrino interactions are at play. We show that it is possible...
Año de publicación: 2010
High energy astrophysical neutrino flux and modified dispersion relations
Motivated by the interest in searches for violation of CPT invariance, we study its possible effects in the flavor ratios of high-energy neutrinos coming from cosmic accelerators. In particular, we focus on the effect of an energy-independent new physics contribution to the neutrino flavor oscillation phase and explore whether it is observable in future detectors. Such a contribution could be related not only to CPT violation but also to a nonuniversal coupling of neutrinos to a torsion field. We conclude that this extra phase contribution only becomes observable, in the best case, at energies greater than 1016.5 GeV, which is about five orders of magnitude higher than the most energetic cosmological neutrinos to be detected in the near future. Therefore, if these effects are present only in the oscillation phase, they are going to be unobservable, unless a new mechanism or source capable to produce neutrinos of such energy were detected.
Año de publicación: 2009
Motivated by the interest in searches for violation of CPT invariance, we study its possible effects in the flavor ratios of high-energy neutrinos coming from cosmic accelerators. In particular, we focus on the effect of an energy-independent new physics contribution to the neutrino flavor oscillation phase and explore whether it is observable in future detectors. Such a contribution could be related not only to CPT violation but also to a nonuniversal coupling of neutrinos to a torsion field. We conclude that this extra phase contribution only becomes observable, in the best case, at energies greater than 1016.5 GeV, which is about five orders of magnitude higher than the most energetic cosmological neutrinos to be detected in the near future. Therefore, if these effects are present only in the oscillation phase, they are going to be unobservable, unless a new mechanism or source capable to produce neutrinos of such energy were detected.
Año de publicación: 2009
Extreme scenarios of new physics in the UHE astrophysical neutrino flavour ratios
We add an energy-independent Hamiltonian to the standard flavour oscillation one. This kind of physics might appear in theories where neutrinos couple differently to a plausible non-zero torsion of the...
Año de publicación: 2009
We add an energy-independent Hamiltonian to the standard flavour oscillation one. This kind of physics might appear in theories where neutrinos couple differently to a plausible non-zero torsion of the...
Año de publicación: 2009
BeamLine Design for MINERvA TestBeam Detector
The MINERνA TestBeam Detector calibrations will take place in the MTEST facility at Fermilab. It will use a beam of hadrons between 300 and 1500 MeV/c to analyze the response...
Año de publicación: 2008
The MINERνA TestBeam Detector calibrations will take place in the MTEST facility at Fermilab. It will use a beam of hadrons between 300 and 1500 MeV/c to analyze the response...
Año de publicación: 2008
On the Sensitivity of Neutrino Telescopes to a Modified Dispersion Relation
We consider a modified dispersion relation and its effect on the flavour ratios of high‐energy neutrinos originated at distant astrophysical sources such as active galactic nuclei. This dispersion relation arise...
Año de publicación: 2008
We consider a modified dispersion relation and its effect on the flavour ratios of high‐energy neutrinos originated at distant astrophysical sources such as active galactic nuclei. This dispersion relation arise...
Año de publicación: 2008
Revising the solution of the neutrino oscillation parameter degeneracies at neutrino factories
In the context of neutrino factories, we review the solution of the degeneracies in the neutrino oscillation parameters. In particular, we have set limits to sin22θ13 in order to accomplish the unambiguous determination of θ23 and δ. We have performed two different analysis. In the first, at a baseline of 3000 km, we simulate a measurement of the channels νe→νμ, νe→ντ, and ¯νμ→¯νμ, combined with their respective conjugate ones, with a muon energy of 50 GeV and a running time of five years. In the second, we merge the simulated data obtained at L=3000 km with the measurement of νe→νμ channel at 7250 km, the so-called “magic baseline.” In both cases, we have studied the impact of varying the ντ detector efficiency-mass product, (ϵντ×Mτ), at 3000 km, keeping unchanged the νμ detector mass and its efficiency. At L=3000 km, we found the existence of degenerate zones, that correspond to values of θ13, which are equal or almost equal to the true ones. These zones are extremely difficult to discard, even when we increase the number of events. However, in the second scenario, this difficulty is overcome, demonstrating the relevance of the “magic baseline.” From this scenario, the best limits of sin22θ13, reached at 3σ, for sin22θ23=0.95, 0.975, and 0.99 are: 0.008, 0.015, and 0.045, respectively, obtained at δ=0, and considering (ϵντ×Mτ)≈125, which is 5 times the initial efficiency-mass combination.
Año de publicación: 2007
In the context of neutrino factories, we review the solution of the degeneracies in the neutrino oscillation parameters. In particular, we have set limits to sin22θ13 in order to accomplish the unambiguous determination of θ23 and δ. We have performed two different analysis. In the first, at a baseline of 3000 km, we simulate a measurement of the channels νe→νμ, νe→ντ, and ¯νμ→¯νμ, combined with their respective conjugate ones, with a muon energy of 50 GeV and a running time of five years. In the second, we merge the simulated data obtained at L=3000 km with the measurement of νe→νμ channel at 7250 km, the so-called “magic baseline.” In both cases, we have studied the impact of varying the ντ detector efficiency-mass product, (ϵντ×Mτ), at 3000 km, keeping unchanged the νμ detector mass and its efficiency. At L=3000 km, we found the existence of degenerate zones, that correspond to values of θ13, which are equal or almost equal to the true ones. These zones are extremely difficult to discard, even when we increase the number of events. However, in the second scenario, this difficulty is overcome, demonstrating the relevance of the “magic baseline.” From this scenario, the best limits of sin22θ13, reached at 3σ, for sin22θ23=0.95, 0.975, and 0.99 are: 0.008, 0.015, and 0.045, respectively, obtained at δ=0, and considering (ϵντ×Mτ)≈125, which is 5 times the initial efficiency-mass combination.
Año de publicación: 2007
Optical Simulation for V0A
The V0A detector is one of the forward detectors that will be used for trigger in the ALICE experiment at CERN. Simulation results of the optical response of the V0A...
Año de publicación: 2006
The V0A detector is one of the forward detectors that will be used for trigger in the ALICE experiment at CERN. Simulation results of the optical response of the V0A...
Año de publicación: 2006
Future tests of non-standard neutrino interactions
We explore non-standard neutrino matter interactions, working as sub-leading effects in the standard mass oscillation framework. Both mechanisms working together, induce a magnifying fake CP violating effect in the presence...
Año de publicación: 2002
We explore non-standard neutrino matter interactions, working as sub-leading effects in the standard mass oscillation framework. Both mechanisms working together, induce a magnifying fake CP violating effect in the presence...
Año de publicación: 2002