4,722 research outputs found
Supersymmetric Higgs Singlet Effects on B-Meson FCNC Observables at Large tan(beta)
Higgs singlet superfields are usually present in most extensions of the
Minimal Supersymmetric Standard Model (MSSM) that address the mu-problem, such
as the Next-to-Minimal Supersymmetric Standard Model (NMSSM) and the Minimal
Nonminimal Supersymmetric Standard Model (MNSSM). Employing a gauge- and
flavour-covariant effective Lagrangian formalism, we show how the singlet Higgs
bosons of such theories can have significant contributions to B-meson
flavour-changing neutral current (FCNC) observables for large values of
at the 1-loop level. Illustrative results
are presented including effects on the B_s and B_d mass differences and on the
rare decay . In particular, we find that depending on the
actual value of the lightest singlet pseudoscalar mass in the NMSSM, the
branching ratio for can be enhanced or even suppressed with
respect to the Standard Model prediction by more than one order of magnitude.Comment: 28 pages, 8 figures, LaTeX. Minor updates. Version to be published in
PR
Tan(beta) enhanced Yukawa couplings for supersymmetric Higgs singlets at one loop
Extensions of the MSSM generically feature gauge singlet Higgs bosons. These
singlet Higgs bosons have tan(beta)-enhanced Yukawa couplings to down-type
quarks and leptons at the one-loop level. We present an effective Lagrangian
incorporating these Yukawa couplings and use it to study their effect on
singlet Higgs boson phenomenology within both the mnSSM and NMSSM. It is found
that the loop-induced couplings represent an appreciable effect for the singlet
pseudoscalar in particular, and may dominate its decay modes in some regions of
parameter space.Comment: Submitted for the SUSY07 proceedings, 4 pages, 5 figure
SUSY Flavour at LHC7
The current 7 TeV run of the LHC experiment shall be able to probe gluino and
squark masses up to values of about 1 TeV. Assuming that hints for SUSY are
found by the end of a 2 fb run, we explore the flavour constraints on
the parameter space of the CMSSM, with and without massive neutrinos. In
particular, we focus on decays that might have been measured by the time the
run is concluded, such as and . We also briefly
show the impact such a collider--flavour interplay would have on a Flavoured
CMSSM.Comment: 4 pages, 3 figures. Preliminary version of arXiv:1111.0176, prepared
for the 2011 Europhysics Conference on High Energy Physics: HEP 2011 (EPS-HEP
2011), Grenoble, France, 21-27 July 201
Blending of nanoscale and microscale in uniform large-area sculptured thin-film architectures
The combination of large thickness ( m), large--area uniformity (75
mm diameter), high growth rate (up to 0.4 m/min) in assemblies of
complex--shaped nanowires on lithographically defined patterns has been
achieved for the first time. The nanoscale and the microscale have thus been
blended together in sculptured thin films with transverse architectures.
SiO () nanowires were grown by electron--beam evaporation onto
silicon substrates both with and without photoresist lines (1--D arrays) and
checkerboard (2--D arrays) patterns. Atomic self--shadowing due to
oblique--angle deposition enables the nanowires to grow continuously, to change
direction abruptly, and to maintain constant cross--sectional diameter. The
selective growth of nanowire assemblies on the top surfaces of both 1--D and
2--D arrays can be understood and predicted using simple geometrical shadowing
equations.Comment: 17 pages, 9 figure
The Generalized Jacobi Equation
The Jacobi equation in pseudo-Riemannian geometry determines the linearized
geodesic flow. The linearization ignores the relative velocity of the
geodesics. The generalized Jacobi equation takes the relative velocity into
account; that is, when the geodesics are neighboring but their relative
velocity is arbitrary the corresponding geodesic deviation equation is the
generalized Jacobi equation. The Hamiltonian structure of this nonlinear
equation is analyzed in this paper. The tidal accelerations for test particles
in the field of a plane gravitational wave and the exterior field of a rotating
mass are investigated. In the latter case, the existence of an attractor of
uniform relative radial motion with speed is pointed
out. The astrophysical implications of this result for the terminal speed of a
relativistic jet is briefly explored.Comment: LaTeX file, 4 PS figures, 28 pages, revised version, accepted for
publication in Classical and Quantum Gravit
Relative effectiveness of clinic and home blood pressure monitoring compared with ambulatory blood pressure monitoring in diagnosis of hypertension: systematic review
Objective To determine the relative accuracy of clinic measurements and home blood pressure monitoring compared with ambulatory blood pressure monitoring as a reference standard for the diagnosis of hypertension
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The aftermath of modernization: examining the impact of a change agenda on local government employees in the UK
The aftermath of modernization: examining the impact of a change agenda on local government employees in the U
Toward a public service management: past, present, and future directions
Purpose: In providing a fine-grained analysis of public service management, the purpose of this paper is to make an important contribution to furthering research in service management, a body of literature that has tended to regard public services as homogenous or to neglect the context altogether.
Design/methodology/approach: Integrating public management and service management literatures, the past and present of public service management are discussed. Future directions for the field are outlined drawing on a service-dominant approach that has the potential to transform public services. Invited commentaries augment the review.
Findings: The review presents the Public Service Network Framework to capture the public value network in its abstraction and conceptualizes how value is created in public services. The study identifies current shortcomings in the field and offers a series of directions for future research where service management theory can contribute greatly.
Research limitations/implications: The review encourages service management research to examine the dynamic, diverse, and complex nature of public services and to recognize the importance of this context. The review calls for an interdisciplinary public service management community to develop, and to assist public managers in leveraging service logic.
Originality/value: The review positions service research in the public sector, makes explicit the role of complex networks in value creation, argues for wider engagement with public service management, and offers future research directions to advance public service management research
Experts' Judgments of Management Journal Quality:An Identity Concerns Model
Many lists that purport to gauge the quality of journals in management and organization studies (MOS) are based on the judgments of experts in the field. This article develops an identity concerns model (ICM) that suggests that such judgments are likely to be shaped by the personal and social identities of evaluators. The model was tested in a study in which 168 editorial board members rated 44 MOS journals. In line with the ICM, respondents rated journal quality more highly to the extent that a given journal reflected their personal concerns (associated with having published more articles in that journal) and the concerns of a relevant ingroup (associated with membership of the journal’s editorial board or a particular disciplinary or geographical background). However, judges’ ratings of journals in which they had published were more favorable when those journals had a low-quality reputation, and their ratings of journals that reflected their geographical and disciplinary affiliations were more favorable when those journals had a high-quality reputation. The findings are thus consistent with the view that identity concerns come to the fore in journal ratings when there is either a need to protect against personal identity threat or a meaningful opportunity to promote social identity
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