1,250 research outputs found
Charged lepton and down-type quark masses in SU(1,1) model and the structure of higgs sector
The simplest noncompact group SU(1,1),when introduced as a symmetry group of
the generations of quarks and leptons in the framework of a vector-like theory,
gives an excellent viewpoint on low energy physics. The minimal setup of the
scheme, however, gives phenomenologically unacceptable prediction on the Yukawa
coupling matrices. This suggests the higgs sector has richer structure than we
expect from the success of MSSM. The natural extension of the scheme, which has
doubled structure in the higgs sector, is formulated. The framework admits this
extension in a restrictive way. The possible patterns of Yukawa couplings are
classified and the expressions of the coupling matrices are presented.Comment: 25 pages, no figure
Strong CP Problem and the Natural Hierarchy of Yukawa Couplings
A possible solution to the strong CP problem is presented without using an
axion. The model is based on the framework of the supersymmetric vectorlike
theory with the spontaneous breakdown of the P-C-T-invariance. It is shown that
the characteristic structure of the Yukawa coupling matrices that results from
the spontaneous P-C-T-breaking plays the essential role in naturally realizing
at the tree level. It is argued that will not be affected
by the radiative corrections.Comment: 31 pages, no figure
Physical Properties of UDF12 Galaxies in Cosmological simulations
We have performed a large cosmological hydrodynamics simulation tailored to
the deep survey with the Hubble Space Telescope made in 2012, the so-called
UDF12 campaign. After making a light-cone output, we have applied the same
color selection criteria as the UDF12 campaign to select galaxies from our
simulation, and then, have examined the physical properties of them as a proxy
of the real observed UDF12 galaxies at . As a result, we find that the
halo mass is almost linearly proportional to the observed ultraviolet (UV)
luminosity ( at ). The dust
attenuation and UV slope well correlates with the observed UV
luminosity, which is consistent with observations quantitatively. The star
formation rate (SFR) is also linearly proportional to the stellar mass and the
specific SFR shows only a weak dependency on the mass. We also find an
increasing star formation history with a time-scale of Myr in the
high- galaxies. An average metallicity weighted by the Lyman continuum
luminosity reaches up to Solar even at , suggesting a rapid
metal enrichment. We also expect mJy at 350 GHz of the dust thermal
emission from the galaxies with , which can be detectable with
the Atacama Large Milimetre-submilimetre Array. The galaxies selected by the
UDF12 survey contribute to only of the cosmic SFR density from to , respectively. The James Webb Space Telescope will push
the detection fraction up to .Comment: re-Submitted to MNRAS; 16 pages; 14 figures; 1 tables
An Approach for School Counselors: Behavioral Consultation with Parents of Youth with School Attendance Problems
The current study investigates and discusses the effectiveness of behavioral consultations that school counselors can apply to students with school attendance problems (SAPs). A school counselor adopted the rapid school return approach in a school-based behavioral consultation with parents of a 13-year-old Japanese male student who refused to attend school. After the parents implemented the approach, the student resumed his regular school attendance, which continued until the end of junior high school. The A–B design in a single case study was employed as the research design. Throughout the implementation of the approach, the findings indicated that: (a) school counselors should conduct behavioral consultation sessions with parents periodically; (b) school counselors and parents should discuss who is responsible for the escorting process; (c) school staff and school counselors should collect accurate attendance data of students with SAPs daily until the end of the academic year; and (d) school counselors should view SAPs as a persistent problem for students, which can relapse at certain points during compulsory school. This current case study suggests that behavioral consultation with parents of youth with SAPs can be effective in dealing with students who refuse to attend school and are unwilling to seek specialists’ help
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