Publications (92)167.47 Total impact
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ABSTRACT: We discuss the potential of a neutrino detector based on liquid scintilator which could be constructed at the ANDES underground laboratory for the observations of neutrinos coming from a galactic supernova and decay of radioactive elements in the Earth interior.10/2013; 
Article: The Physics of Neutrinos
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ABSTRACT: These lecture notes are based on a course given at Institut de Physique Th\'eorique of CEA/Saclay in January/February 2013.08/2013;  [Show abstract] [Hide abstract]
ABSTRACT: We discuss how the lepton CP phase can be constrained by accelerator and reactor measurements in an era without dedicated experiments for CP violation search. To characterize globally the sensitivity to the CP phase \delta_{CP}, we introduce a new measure, the CP exclusion fraction, which quantifies what fraction of the \delta_{CP} space can be excluded at a given input values of \theta_{23} and \delta_{CP}. Using the measure we study the CP sensitivity which may be possessed by the accelerator experiments T2K and NOvA. We show that, if the mass hierarchy is known, T2K and NOvA alone may exclude, respectively, about 50%60% and 40%50% of the \delta_{CP} space at 90% CL by 10 years running, provided that a considerable fraction of beam time is devoted to the antineutrino run. The synergy between T2K and NOvA is remarkable, leading to the determination of the mass hierarchy through CP sensitivity at the same CL.07/2013; 
Article: Revisiting the Triangulation Method for Pointing to Supernova and Failed Supernova with Neutrinos
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ABSTRACT: In view of the advent of largescale neutrino detectors such as IceCube, the future HyperKamiokande and the ones proposed for the Laguna project in Europe, we reexamine the determination of the directional position of a Galactic supernova by means of its neutrinos using the triangulation method. We study the dependence of the pointing accuracy on the arrival time resolution of supernova neutrinos at different detectors. For a failed supernova, we expect better results due to the abrupt termination of the neutrino emission which allows one to measure the arrival time with higher precision. We found that for the time resolution of $\pm$ 2 (4) ms, the supernova can be located with a precision of $\sim$ 5 (10)$^\circ$ on the declination and of $\sim$ 8 (15)$^\circ$ on the right ascension angle, if we combine the observations from detectors at four different sites.Physical review D: Particles and fields 04/2013; 88(8).  [Show abstract] [Hide abstract]
ABSTRACT: We analyze the neutrino mass matrix entries and their correlations in a probabilistic fashion, constructing probability distribution functions using the latest results from neutrino oscillation fits. Two cases are considered: the standard three neutrino scenario as well as the inclusion of a new sterile neutrino that potentially explains the reactor and gallium anomalies. We discuss the current limits and future perspectives on the mass matrix elements that can be useful for model building.Journal of High Energy Physics 02/2013; 2013(6). · 5.62 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We analyze the behavior of Higgs to diphoton rate and Higgs gluongluon production cross section in minimal extensions of the Standard Model comprising new colored vectorlike fermions that do not mix with the ordinary ones. We compare these information with constraints coming from electroweak precision measurements. We compute pair production cross sections for the lightest fermion and discuss the LHC bounds. Finally, we study the phenomenology of possible quarkonium states composed by these new colored fermions.Journal of High Energy Physics 09/2012; 2013(2). · 5.62 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: The construction of the Agua Negra tunnels that will link Argentina and Chile under the Andes, the world longest mountain range, opens the possibility to build the first deep underground labo ratory in the Southern Hemisphere. This laboratory has the acronym ANDES (Agua Negra Deep Experiment Site) and its overburden could be as large as \sim 1.7 km of rock, or 4500 mwe, providing an excellent low background environment to study physics of rare events like the ones induced by neutrinos and/or dark matter. In this paper we investigate the physics potential of a few kiloton size liquid scintillator detector, which could be constructed in the ANDES laboratory as one of its possible scientific programs. In particular, we evaluate the impact of such a detector for the studies of geoneutrinos and galactic supernova neutrinos assuming a fiducial volume of 3 kilotons as a reference size. We emphasize the complementary roles of such a detector to the ones in the Northern Hemisphere neutrino facilities through some advantages due to its geographical location.Physical review D: Particles and fields 07/2012; 86(12).  [Show abstract] [Hide abstract]
ABSTRACT: We analyse the interplay between the Higgs to diphoton rate and electroweak precision measurements contraints in extensions of the Standard Model with new uncolored charged fermions that do not mix with the ordinary ones. We also compute the pair production cross sections for the lightest fermion and compare them with current bounds.07/2012;  [Show abstract] [Hide abstract]
ABSTRACT: If the neutrino analogue of the Mössbauer effect, namely, recoiless emission and resonant capture of neutrinos is realized, one can study neutrino oscillations with much shorter baselines and smaller source/detector size when compared to conventional experiments. In this work, we discuss the potential of such a Mössbauer neutrino oscillation experiment to probe nonstandard neutrino properties coming from some new physics beyond the standard model. We investigate four scenarios for such new physics that modify the standard oscillation pattern. We consider the existence of a light sterile neutrino that can mix with ¯ ν e , the existence of a KaluzaKlein tower of sterile neutrinos that can mix with the flavor neutrinos in a model with large flat extra dimensions, neutrino oscillations with nonstandard quantum decoherence and mass varying neutrinos, and discuss to which extent one can constrain these scenarios. We also discuss the impact of such new physics on the determination of the standard oscillation parameters.Journal of High Energy Physics 01/2012; 11. · 5.62 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We present an alternative explanation to the reactor antineutrino anomaly through neutrino oscillation induced by the presence of a large flat extra dimension with a size in the submicrometer range. We also show that the solution is consistent with the other existing oscillation data.Journal of Physics Conference Series 01/2012; 375(4).  [Show abstract] [Hide abstract]
ABSTRACT: We discuss the potential of a liquid scintillator neutrino detector of about 3 kilotons located in the proposed first deep underground laboratory in the Southern Hemisphere, ANDES, to measure geoneutrinos and neutrinos from a stellar corecollapse.Journal of Physics Conference Series 01/2012; 375(4).  [Show abstract] [Hide abstract]
ABSTRACT: In the framework of gauged flavour symmetries, new fermions in parity symmetric representations of the standard model are generically needed for the compensation of mixed anomalies. The key point is that their masses are also protected by flavour symmetries and some of them are expected to lie way below the flavour symmetry breaking scale(s), which has to occur many orders of magnitude above the electroweak scale to be compatible with the available data from flavour changing neutral currents and CP violation experiments. We argue that, actually, some of these fermions would plausibly get masses within the LHC range. If they are taken to be heavy quarks and leptons, in (bi)fundamental representations of the standard model symmetries, their mixings with the light ones are strongly constrained to be very small by electroweak precision data. The alternative chosen here is to exactly forbid such mixings by breaking of flavour symmetries into an exact discrete symmetry, the socalled protonhexality, primarily suggested to avoid proton decay. As a consequence of the large value needed for the flavour breaking scale, those heavy particles are longlived and rather appropriate for the current and future searches at the LHC for quasistable hadrons and leptons. In fact, the LHC experiments have already started to look for them.Journal of High Energy Physics 12/2011; 2012(2). · 5.62 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: 91 {+} 2% of Boron solar neutrinos observed by SNO are mass eigenstates.Nuclear Physics B  Proceedings Supplements 12/2011; · 0.88 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: The lepton mixing angle theta_13, the only unknown angle in the standard threeflavor neutrino mixing scheme, is finally measured by the recent reactor and accelerator neutrino experiments. We perform a combined analysis of the data coming from T2K, MINOS, Double Chooz, Daya Bay and RENO experiments and find sin^2 2theta_13 = 0.096 \pm 0.013 (\pm 0.040) at 1 sigma (3 sigma) CL and that the hypothesis theta_13 = 0 is now rejected at a significance level of 7.7 sigma. We also discuss the near future expectation on the precision of the theta_13 determination by using expected data from these ongoing experiments.Journal of High Energy Physics 11/2011; 2012(5). · 5.62 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We consider a model where righthanded neutrinos propagate in a large compactified extra dimension, engendering KaluzaKlein (KK) modes, while the standard model particles are restricted to the usual 4dimensional brane. A mass term mixes the KK modes with the standard lefthanded neutrinos, opening the possibility of change the 3 generation mixing pattern. We derive bounds on the maximum size of the extra dimension from neutrino oscillation experiments. We show that this model provides a possible explanation for the deficit of nu_e in Ga solar neutrino calibration experiments and of the antinu_e in short baseline reactor experiments.Nuclear Physics B  NUCL PHYS B. 10/2011; 585(1).  [Show abstract] [Hide abstract]
ABSTRACT: We consider an alternative explanation for the deficit of nu_e in Ga solar neutrino calibration experiments and of the anti nu_e in short baseline reactor experiments by a model where neutrinos can oscillate into sterile KaluzaKlein modes that can propagate in compactified submicrometer flat extra dimensions. We have analyzed the results of the Gallium radioactive source experiments and 19 reactor experiments with baseline shorter than 100 m, and showed that these data can be fitted into this scenario. The values of the lightest neutrino mass and of the size of the largest extra dimension that are compatible with these experiments are mostly not excluded by other neutrino oscillation experiments.Physical review D: Particles and fields 07/2011; 85(7).  [Show abstract] [Hide abstract]
ABSTRACT: We consider a model where sterile neutrinos can propagate in a large compactified extra dimension (a) giving rise to KaluzaKlein (KK) modes and the Standard Model lefthanded neutrinos are confined to a 4dimensional spacetime brane. The KK modes mix with the standard neutrinos modifying their oscillation pattern. We examine current experiments in this framework obtaining stringent limits on a.Nuclear Physics B  Proceedings Supplements 01/2011; 217(1). · 0.88 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We consider an alternative explanation for the deficit of νe in Ga solar neutrino calibration experiments and of the ¯ νe in short baseline reactor experiments by a model where neutrinos can oscillate into sterile KaluzaKlein modes that can propagate in compactified submicrometer flat extra dimensions. We have analyzed the results of the Gallium radioactive source experiments and 19 reactor experiments with baseline shorter than 100 m, and showed that these data can be fitted into this scenario. The values of the lightest neutrino mass and of the size of the largest extra dimension that are compatible with these experiments are mostly not excluded by other neutrino oscillation experiments.01/2011;  [Show abstract] [Hide abstract]
ABSTRACT: We consider a model where sterile neutrinos can propagate in a large compactified extra dimension giving rise to KaluzaKlein (KK) modes and the standard model lefthanded neutrinos are confined to a 4dimensional spacetime brane. The KK modes mix with the standard neutrinos modifying their oscillation pattern. We examine former and current experiments such as CHOOZ, KamLAND, and MINOS to estimate the impact of the possible presence of such KK modes on the determination of the neutrino oscillation parameters and simultaneously obtain limits on the size of the largest extra dimension. We found that the presence of the KK modes does not essentially improve the quality of the fit compared to the case of the standard oscillation. By combining the results from CHOOZ, KamLAND and MINOS, in the limit of a vanishing lightest neutrino mass, we obtain the stronger bound on the size of the extra dimension as ~ 1.0(0.6) micrometer at 99% C. L. for normal (inverted) mass hierarchy. If the lightest neutrino mass turn out to be larger, 0.2 eV, for example, we obtain the bound ~ 0.1 micrometer. We also discuss the expected sensitivities on the size of the extra dimension for future experiments such as Double CHOOZ, T2K and NOvA.Physical review D: Particles and fields 12/2010; 84.  [Show abstract] [Hide abstract]
ABSTRACT: 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 to disentangle the two CP violating effects by measuring muon neutrino appearance using a near‐far two detector setting in a neutrino factory experiment.AIP Conference Proceedings. 03/2010; 1222(1):140144.
Publication Stats
1k  Citations  
167.47  Total Impact Points  
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Institutions

1992–2013

University of São Paulo
 São Carlos Institute of Physics
San Paulo, São Paulo, Brazil


2011

Pontifícia Universidade Católica do Rio de Janeiro
 Department of Physics (FIS)
Rio de Janeiro, Rio de Janeiro, Brazil


2008

University of Campinas
 Instituto de Física "Gleb Wataghin" (IFGW)
Conceição de Campinas, São Paulo, Brazil


2002

São Paulo State University
 Instituto de Física Teórica
São José do Rio Preto, Estado de Sao Paulo, Brazil


2000

Carnegie Mellon University
Pittsburgh, Pennsylvania, United States
