3,068 research outputs found
An Arnoldi-frontal approach for the stability analysis of flows in a collapsible channel
In this paper, we present a new approach based on a combination of the Arnoldi and frontal methods for solving large sparse asymmetric and generalized complex eigenvalue problems. The new eigensolver seeks the most unstable eigensolution in the Krylov subspace and makes use of the efficiency of the frontal solver developed for the finite element methods. The approach is used for a stability analysis of flows in a collapsible channel and is found to significantly improve the computational efficiency compared to the traditionally used QZ solver or a standard Arnoldi method. With the new approach, we are able to validate the previous results obtained either on a much coarser mesh or estimated from unsteady simulations. New neutral stability solutions of the system have been obtained which are beyond the limits of previously used methods
Higgs-flavon mixing and LHC phenomenology in a simplified model of broken flavor symmetry
The LHC phenomenology of a low-scale gauged flavor symmetry model with
inverted hierarchy is studied, through introduction of a simplified model of
broken flavor symmetry. A new scalar (a flavon) and a new neutral top-philic
massive gauge boson emerge with mass in the TeV range along with a new heavy
fermion associated with the standard model top quark. After checking
constraints from electroweak precision observables, we investigate the
influence of the model on Higgs boson physics, notably on its production cross
section and decay branching fractions. Limits on the flavon from
heavy Higgs boson searches at the LHC at 7 and 8 TeV are presented. The
branching fractions of the flavon are computed as a function of the flavon mass
and the Higgs-flavon mixing angle. We also explore possible discovery of the
flavon at 14 TeV, particularly via the decay
channel in the final state, and through standard model Higgs
boson pair production in the
final state. We conclude that the flavon mass range up to GeV could
probed down to quite small values of the Higgs-flavon mixing angle with 100
fb of integrated luminosity at 14 TeV.Comment: 17 pages, 14 figure
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