103 citations · 914 across the 27 of their papers we have counts for
23 papers · 1 filter
Supersymmetric Majoron Inflation
Stephen F. King, Patrick Otto Ludl
We propose supersymmetric Majoron inflation in which the Majoron field responsible for generating right-handed neutrino masses may also be suitable for giving low scale "hillto…
Unifying leptogenesis, dark matter and high-energy neutrinos with right-handed neutrino mixing via Higgs portal
Pasquale Di Bari, Patrick Otto Ludl, Sergio Palomares-Ruiz
We revisit a model in which neutrino masses and mixing are described by a two right-handed (RH) neutrino seesaw scenario, implying a strictly hierarchical light neutrino spectrum.…
Direct and Semi-Direct Approaches to Lepton Mixing with a Massless Neutrino
Stephen F. King, Patrick Otto Ludl
We discuss the possibility of enforcing a massless Majorana neutrino in the direct and semi-direct approaches to lepton mixing, in which the PMNS matrix is partly predicted by subg…
Direct Neutrino Mass Experiments and Exotic Charged Current Interactions
Patrick Otto Ludl, Werner Rodejohann
We study the effect of exotic charged current interactions on the electron energy spectrum in tritium decay, focussing on the KATRIN experiment and a possible modified setup that h…
Lepton mixing from the hidden sector
P. O. Ludl, A. Yu. Smirnov
Experimental results indicate a possible relation between the lepton and quark mixing matrices of the form U_PMNS \approx V_CKM^\dagger U_X, where U_X is a matrix with special stru…
A complete survey of texture zeros in general and symmetric quark mass matrices
Patrick Otto Ludl, Walter Grimus
We perform a systematic analysis of all possible texture zeros in general and symmetric quark mass matrices. Using the values of masses and mixing parameters at the electroweak sca…
Mass renormalization in a toy model with spontaneously broken symmetry
W. Grimus, P. O. Ludl, L. Nogués
We discuss renormalization in a toy model with one fermion field and one real scalar field phi, featuring a spontaneously broken discrete symmetry which forbids a fermion mass term…
A complete survey of texture zeros in the lepton mass matrices
Patrick Otto Ludl, Walter Grimus
We perform a systematic and complete analysis of texture zeros in the lepton mass matrices and identify all viable and maximally restrictive cases of pairs (M_\ell, M_D) and (M_\el…
Residual Z2 x Z2 symmetries and lepton mixing
Luis Lavoura, Patrick Otto Ludl
We consider two novel scenarios of residual symmetries of the lepton mass matrices. Firstly we assume a Z2 x Z2 symmetry G_ell for the charged-lepton mass matrix and a Z2 symmetry…
Current status of constraints on the elements of the neutrino mass matrix
Patrick Otto Ludl
We analyse the mass matrix of the three light neutrinos in the basis where the charged-lepton mass matrix is diagonal and discuss constraints on its elements for the Majorana and t…
Correlations and textures in the neutrino mass matrix
Walter Grimus, Patrick Otto Ludl
The recent enormous improvement of our knowledge of the neutrino oscillation parameters has motivated us to reinvestigate the allowed ranges of the elements of the neutrino mass ma…
Five models for lepton mixing
P. M. Ferreira, L. Lavoura, P. O. Ludl
We produce five flavour models for the lepton sector. All five models fit perfectly well---at the one-sigma level---the existing data on the neutrino mass-squared differences and o…
Proceedings of the 2nd Workshop on Flavor Symmetries and Consequences in Accelerators and Cosmology (FLASY12)
I. de Medeiros Varzielas, C. Hambrock, G. Hiller +66
These are the proceedings of the 2nd Workshop on Flavor Symmetries and Consequences in Accelerators and Cosmology, held 30 June 2012 - 4 July 2012, Dortmund, Germany.
Correlations of the elements of the neutrino mass matrix
Walter Grimus, Patrick Otto Ludl
Assuming Majorana nature of neutrinos, we re-investigate, in the light of the recent measurement of the reactor mixing angle, the allowed ranges for the absolute values of the elem…
Two-parameter neutrino mass matrices with two texture zeros
W. Grimus, P. O. Ludl
We reanalyse Majorana-neutrino mass matrices M_nu with two texture zeros, by searching for viable hybrid textures in which the non-zero matrix elements of M_nu have simple ratios.…
Maximal CP violation in lepton mixing from a model with Delta(27) flavour symmetry
P. M. Ferreira, W. Grimus, L. Lavoura +1
We propose a simple mechanism which enforces |U_{mu j}| = | U_{tau j}| forall j = 1,2,3 in the lepton mixing matrix U. This implies maximal atmospheric neutrino mixing and a maxima…
Proceedings of the first workshop on Flavor Symmetries and consequences in Accelerators and Cosmology (FLASY2011)
M. Hirsch, D. Meloni, S. Morisi +43
The main goals of the first "Workshop on FLAvor SYmmetries and consequences in accelerators and cosmology" (FLASY) was to summarize the theoretical status of flavor symmetries, bri…
Finite flavour groups of fermions
Walter Grimus, Patrick Otto Ludl
We present an overview of the theory of finite groups, with regard to their application as flavour symmetries in particle physics. In a general part, we discuss useful theorems con…
The reactor mixing angle and CP violation with two texture zeros in the light of T2K
P. O. Ludl, S. Morisi, E. Peinado
We reconsider the phenomenological implications of two texture zeros in symmetric neutrino mass matrices in the light of the recent T2K result for the reactor angle and the new glo…
Maximal atmospheric neutrino mixing from texture zeros and quasi-degenerate neutrino masses
W. Grimus, P. O. Ludl
It is well-known that, in the basis where the charged-lepton mass matrix is diagonal, there are seven cases of two texture zeros in Majorana neutrino mass matrices that are compati…
Principal series of finite subgroups of SU(3)
W. Grimus, P. O. Ludl
We attempt to give a complete description of the "exceptional" finite subgroups Sigma(36x3), Sigma(72x3) and Sigma(216x3) of SU(3), with the aim to make them amenable to model buil…
Systematic analysis of finite family symmetry groups and their application to the lepton sector
Patrick Otto Ludl
In this work we will investigate Lagrangians of the standard model extended by three right-handed neutrinos, and the consequences of invariance under finite groups G for lepton mas…
Is S4 the horizontal symmetry of tri-bimaximal lepton mixing?
W. Grimus, L. Lavoura, P. O. Ludl
We determine the symmetry groups under which the charged-lepton and the Majorana-neutrino mass terms are invariant. We note that those two groups always exist trivially, i.e. indep…