334 research outputs found
Meter-baseline tests of sterile neutrinos at Daya Bay
We explore the sensitivity of an experiment at the Daya Bay site, with a
point radioactive source and a few meter baseline, to neutrino oscillations
involving one or more eV mass sterile neutrinos. We find that within a year,
the entire 3+2 and 1+3+1 parameter space preferred by global fits can be
excluded at the 3\sigma level, and if an oscillation signal is found, the 3+1
and 3+2 scenarios can be distinguished from each other at more than the 3\sigma
level provided one of the sterile neutrinos is lighter than 0.5 eV.Comment: 4 pages, 5 figures, 1 table. Version to appear in PL
Hyperfine splitting in muonic hydrogen constrains new pseudoscalar interactions
We constrain the possibility of a new pseudoscalar coupling between the muon
and proton using a recent measurement of the 2S hyperfine splitting in muonic
hydrogen.Comment: 3 pages, 2 figures. Version to appear in PL
Neutrino seesaw mechanism with texture zeros
In the context of the Type I seesaw mechanism, we carry out a systematic
study of the constraints that result from zeros in both the Dirac and
right-handed Majorana neutrino mass matrices. We find that most constraints can
be expressed in the standard form with one or two element/cofactor zeros alone,
while there are 9 classes of nonstandard constraints. We show that all the
constraints are stable under one-loop renormalization group running from the
lightest right-handed neutrino mass scale to the electroweak scale. We study
the predictions of the nonstandard constraints for the lightest neutrino mass,
Dirac CP phase and neutrinoless double beta decay.Comment: 43 pages, 9 figures, 3 tables. Version to appear in NP
Texture and Cofactor Zeros of the Neutrino Mass Matrix
We study Majorana neutrino mass matrices that have two texture zeros, or two
cofactor zeros, or one texture zero and one cofactor zero. The two
texture/cofactor zero conditions give four constraints, which in conjunction
with the five measured oscillation parameters completely determine the nine
independent real parameters of the neutrino mass matrix. We also study the
implications that future measurements of neutrinoless double beta decay and the
Dirac CP phase will have on these cases.Comment: 25 pages, 8 tables, 11 figures. Version to appear in JHE
Partial quark-lepton universality and neutrino CP violation
We study a model with partial quark-lepton universality that can naturally
arise in grand unified theories. We find that constraints on the model can be
reduced to a single condition on the Dirac CP phase in the neutrino
sector. Using our current knowledge of the CKM and PMNS mixing matrices, we
predict at .Comment: 8 pages, 1 figure. Version to appear in the special issue, "Neutrino
Masses and Oscillations 2015", of Advances in High Energy Physic
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