842 research outputs found
FCNC and CP Violation Observables in a SU(3)-flavoured MSSM
A non-Abelian flavour symmetry in a minimal supersymmetric standard model can
explain the flavour structures in the Yukawa couplings and simultaneously solve
the SUSY flavour problem. Similarly the SUSY CP problem can be solved if CP is
spontaneously broken in the flavour sector. In this work, we present an
explicit example of these statements with a SU(3) flavour symmetry and
spontaneous CP violation. In addition, we show that it is still possible to
find some significant deviation from the SM expectations as far as FCNC and CP
violation are concerned. We find that large contributions can be expected in
lepton flavour violating decays, as and , electric dipole moments, and and kaon CP violating
processes as . Thus, these flavoured MSSM realizations are
phenomenologically sensitive to the experimental searches in the realm of
flavor and CP vioation physics.Comment: 56 pages, 12 figures; included new NLO contributions to nEDM from
charged Higgs, relevant figures updated, and analysis of O(1) coefficients;
added appendices and reference
Lepton masses and mixing angles from heterotic orbifold models
We systematically study the possibility for realizing realistic values of
lepton mass ratios and mixing angles by using only renormalizable Yukawa
couplings derived from heterotic -I orbifold. We assume one pair of up and
down sector Higgs fields. We consider both the Dirac neutrino mass scenario and
the seesaw scenario with degenerate right-handed majorana neutrino masses. It
is found that realistic values of the charged lepton mass ratios,
and , the neutrino mass squared difference ratio, , and the lepton mixing angles can be obtained in
certain cases.Comment: 22 pages, late
Measurement Error in Research on Human Resources and Firm Performance: Additional Data and Suggestions for Future Research
Gerhart and colleagues and Huselid and Becker recently debated the presence and implications of measurement error in measures of human resource practices. This paper presents data from three more studies, one of large organizations from different industries at the corporate level, one from commercial banks, and the other of autonomous business units at the level of the job. Results of all three studies provide additional evidence that single respondent measures of HR practices contain large amounts of measurement error. Implications for future research are discussed
Re (epsilon'/epsilon_K) vs. B_d -> phi K_S CP asymmetry
In a SUSY GUT seesaw scenario, the largeness of the atmospheric neutrino
mixing can reflect itself into an enhanced flavor changing mixing of beauty and
strange right-handed scalar quarks. If the CP violating phase in such down type
squark RR insertion is the main source of CP asymmetry in B_d -> phi K_S and
the gluino contributions to K0-K0 bar and B0-B0 bar mixing are negligible,
there is a correlation between Re (epsilon'/epsilon_K) and B_d -> phi K_S CP
asymmetry, in addition to that with the strange quark CEDM. The current data on
Re (epsilon'/epsilon_K) = (16.7 +- 2.6) 10^-4 imply that S_{phi K} should be
greater than \sim 0.5 (0.25) for mu tan beta = 1 (5) TeV, assuming the RR
dominance in b -> s transition and the minimal supergravity type boundary
conditions for soft parameters.Comment: 15 pages, 2 figures. Added references and discussions. Version to be
published in PR
String-derived D4 flavor symmetry and phenomenological implications
In this paper we show how some flavor symmetries may be derived from the
heterotic string, when compactified on a 6D orbifold. In the body of the paper
we focus on the family symmetry, recently obtained in
orbifold constructions. We show how this flavor symmetry constrains fermion
masses, as well as the soft SUSY breaking mass terms. Flavor symmetry breaking
can generate the hierarchy of fermion masses and at the same time the flavor
symmetry suppresses large flavor changing neutral current processes.Comment: 17 pages, no figur
Lepton non-universality at LEP and charged Higgs
A recent analysis of the LEP data shows an interesting deviation from lepton
universality in W boson decays. An excess at the level of 2.8 sigma is found in
the tau mode branching ratio with respect to the other two modes. It is
suggested that this seeming lepton non-universality might stem from pair
production of charged Higgs bosons almost degenerate with W, that
preferentially decay to heavy fermions. It is shown that the deviation can be
reduced to 1.4 sigma in two Higgs doublet model I without any conflict with the
existing direct or indirect constraints. This conclusion is largely independent
of tan beta, the ratio of Higgs vacuum expectation values. This scenario can be
tested at the forthcoming international linear collider.Comment: 16 pages, published version with minor change
An experimental study on water surface profiles of high Froude number flows
Motivated by need to study supercritical overbank flows on floodplain, we experimentally investigate if initially supercritical flow in a rectangular flume would maintain its state throughout. Varying upstream gate opening, flow rate and angle of the slope, a total of 37 experimental cases were carried out. The experimental results are compared to two existing theories: an inviscid theory based on nonlinear shallow water equations and jump conditions and a hydraulic theory that takes friction into account. The experimental data are consistent with the two theories. Flows on downward slope were stable, while those on upward slope had unstable hydraulic jump and transformed into subcritical flow. The reported results should serve well in designing a laboratory flume with the supercritical inflow and in conducting hydraulic model experiments on overbank flows.OAIID:RECH_ACHV_DSTSH_NO:T201834776RECH_ACHV_FG:RR00200001ADJUST_YN:EMP_ID:A080988CITE_RATE:.94FILENAME:2018KSCE22Park-etal.pdfDEPT_NM:건설환경공학부EMAIL:[email protected]_YN:YFILEURL:https://srnd.snu.ac.kr/eXrepEIR/fws/file/7f084c6c-e938-4359-acd7-76c6151612bc/linkN
Quasi-coherent fluctuation measurement with the upgraded microwave imaging reflectometer in KSTAR
The microwave imaging reflectometer (MIR) is the leading diagnostic tool for study of density fluctuations in KSTAR. For last three years since 2014, major components such as the multi-frequency probe beam source, multi-channel detector array, signal processing electronic system, data acquisition system, and optical system have been gradually upgraded. In this paper, the detailed system upgrade with test results in the laboratory and/or plasma is given, and analysis results of a distinctive fluctuation structure referred to as the quasi-coherent mode (QCM) measured by the upgraded MIR system for an L-mode discharge are presented. Cross-coherence analysis with multiple channels shows that the QCM is localized in a core region and appears to be driven by electron temperature gradient for the discharg
Prevalence and characteristics of apical aneurysm on cardiovascular magnetic resonance in patients with hypertrophic cardiomyopathy
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