Testable baryogenesis in seesaw models Hernández, P.; Kekic, M.; López-Pavón, J. ...
The journal of high energy physics,
08/2016, Letnik:
2016, Številka:
8
Journal Article
Recenzirano
Odprti dostop
A
bstract
We revisit the production of baryon asymmetries in the minimal type I seesaw model with heavy Majorana singlets in the GeV range. In particular we include “washout” effects from scattering ...processes with gauge bosons, Higgs decays and inverse decays, besides the dominant top scatterings. We show that in the minimal model with two singlets, and for an inverted light neutrino ordering, future measurements from SHiP and neutrinoless double beta decay could in principle provide sufficient information to predict the matter-antimatter asymmetry in the universe. We also show that SHiP measurements could provide very valuable information on the PMNS CP phases.
The seesaw path to leptonic CP violation Caputo, A.; Hernandez, P.; Kekic, M. ...
The European physical journal. C, Particles and fields,
04/2017, Letnik:
77, Številka:
4
Journal Article
Recenzirano
Odprti dostop
Future experiments such as SHiP and high-intensity
e
+
e
-
colliders will have a superb sensitivity to heavy Majorana neutrinos with masses below
M
Z
. We show that the measurement of the mixing to ...electrons and muons of one such state could establish the existence of CP violating phases in the neutrino mixing matrix, in the context of low-scale seesaw models. We quantify in the minimal model the CP reach of these future experiments, and demonstrate that CP violating phases in the mixing matrix could be established at 5
σ
CL in a very significant fraction of parameter space.
Leptogenesis in GeV-scale seesaw models Hernández, P.; Kekic, M.; López-Pavón, J. ...
The journal of high energy physics,
10/2015, Letnik:
2015, Številka:
10
Journal Article
Recenzirano
Odprti dostop
A
bstract
We revisit the production of leptonic asymmetries in minimal extensions of the Standard Model that can explain neutrino masses, involving extra singlets with Majorana masses in the GeV ...scale. We study the quantum kinetic equations both analytically, via a perturbative expansion up to third order in the mixing angles, and numerically. The analytical solution allows us to identify the relevant CP invariants, and simplifies the exploration of the parameter space. We find that sizeable lepton asymmetries are compatible with non-degenerate neutrino masses and measurable active-sterile mixings.
We evaluate the contribution to N sub(eff) of the extra sterile states in low-scale type I seesaw models (with three extra sterile states). We explore the full parameter space and find that at least ...two of the heavy states always reach thermalization in the early Universe, while the third one might not thermalize provided the lightest neutrino mass is below scriptO(10 super(-3) eV). Constraints from cosmology therefore severely restrict the spectra of heavy states in the range 1 eV-100 MeV. The implications for neutrinoless double beta decay are also discussed.
Institute for Biomedical Research, Muscle Research Unit, Department
of Anatomy and Histology, University of Sydney, Sydney,
Australia
Dos Remedios, C. G.,
D. Chhabra,
M. Kekic,
I. V. Dedova,
M. ...Tsubakihara,
D. A. Berry, and
N. J. Nosworthy.
Actin Binding Proteins: Regulation of Cytoskeletal
Microfilaments. Physiol. Rev. 83: 433-473, 2003. The actin cytoskeleton is a complex
structure that performs a wide range of cellular functions. In 2001, significant advances were made to our understanding of the structure
and function of actin monomers. Many of these are likely to help us
understand and distinguish between the structural models of actin
microfilaments. In particular, 1 ) the structure of actin was
resolved from crystals in the absence of cocrystallized actin binding
proteins (ABPs), 2 ) the prokaryotic ancestral gene of actin
was crystallized and its function as a bacterial cytoskeleton was
revealed, and 3 ) the structure of the Arp2/3 complex was
described for the first time. In this review we selected several ABPs
(ADF/cofilin, profilin, gelsolin, thymosin 4, DNase I, CapZ,
tropomodulin, and Arp2/3) that regulate actin-driven assembly,
i.e., movement that is independent of motor proteins. They were chosen
because 1 ) they represent a family of related proteins,
2 ) they are widely distributed in nature, 3 ) an
atomic structure (or at least a plausible model) is available for each
of them, and 4 ) each is expressed in significant quantities
in cells. These ABPs perform the following cellular functions:
1 ) they maintain the population of unassembled but assembly-ready actin monomers (profilin), 2 ) they
regulate the state of polymerization of filaments (ADF/cofilin,
profilin), 3 ) they bind to and block the growing ends of
actin filaments (gelsolin), 4 ) they nucleate actin assembly
(gelsolin, Arp2/3, cofilin), 5 ) they sever actin filaments
(gelsolin, ADF/cofilin), 6 ) they bind to the sides of actin
filaments (gelsolin, Arp2/3), and 7 ) they cross-link
actin filaments (Arp2/3). Some of these ABPs are essential, whereas
others may form regulatory ternary complexes. Some play crucial roles
in human disorders, and for all of them, there are good reasons why
investigations into their structures and functions should continue.
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