47 research outputs found
Hosotani mechanism on the lattice
We explore the phase structure and symmetry breaking in four-dimensional
SU(3) gauge theory with one spatial compact dimension on the lattice in the
presence of fermions in the adjoint and fundamental representations with
general boundary conditions. The eigenvalue phases of Polyakov loops and the
associated susceptibility are measured on 16^3 x 4 lattice. We establish a
correspondence between the phases found on the lattice and the gauge symmetry
breaking by the Hosotani mechanism.Comment: 7 pages, 4 figures, prepared for the 31st International Symposium on
Lattice Field Theory - LATTICE 2013 Added preprint number
Nonuniversal couplings in B decays
We study the impacts of nonuniversal model, providing flavor
changing neutral current at tree level, on the branching ratios (BRs), CP
asymmetries (CPAs) and polarization fractions of B decays. We find that for
satisfying the current data, the new left- and right-handed couplings have to
be included at the same time. The new introduced effective interactions not
only could effectively explain the puzzle of small longitudinal polarization in
decays, but also provide a solution to the small CPA of
. We also find that the favorable CPA of
is opposite in sign to the standard model;
meanwhile, the CPA of has to be smaller than -10%. In
addition, by using the values of parameters which are constrained by , we find that the favorable ranges of BRs, CPAs, longitudinal polarizations,
and perpendicular transverse polarizations for are ,
, and , respectively.Comment: 28 pages, 9 figures, version revise
Pseudoscalar and Scalar Operators of Higgs-Penguins in the MSSM and B to phi K^*, K eta(') Decays
We study the effect of b to s sbar s scalar/pseudoscalar operators in B to K
eta('), phi K^* decays. In the minimal supersymmetric standard model (MSSM),
such scalar/pseudoscalar operators can be induced by the penguin diagrams of
neutral Higgs bosons. These operators can be Fierz-transformed into tensor
operators, and the resultant tensor operators could affect the transverse
polarization amplitudes in B to phi K^* decays. A combined analysis of the
decays B to phi K^* and B to K eta('), including b to s sbar s
scalar/pseudoscalar operators and their Fierz-transformed tensor operators
originated from the MSSM, is performed. Our study is based on the followings:
(1) Assuming that weak annihilations in B to phi K^* is negligible and the
polarization puzzle is resolved by Fierz-transformed tensor operators, it
results in too large coefficients of scalar/pseudoscalar operators, such that
the resulting B to K eta(') branching fractions are much larger than
observations. (2) When we take the weak annihilations in B to phi K^* into
account, the polarization puzzle can be resolved. In this case, new physics
effects are strongly suppressed and no more relevant to the enhancement of the
transverse modes in B to phi K^* decays.Comment: 27 pages, 3 figures; (v2) data and results updated, typos correcte
AdS/QCD approach to the scale-invariant extension of the standard model with a strongly interacting hidden sector
In this paper, we revisit a scale-invariant extension of the standard model
(SM) with a strongly interacting hidden sector within AdS/QCD approach. Using
the AdS/QCD, we reduce the number of input parameters to three, {\it i.e.}
hidden pion decay constant, hidden pion mass and that is defined as
the ratio of the vacuum expectation values (VEV) of the singlet scalar field
and the SM Higgs boson. As a result, our model has sharp predictability. We
perform the phenomenological analysis of the hidden pions which is one of the
dark matter (DM) candidates in this model. With various theoretical and
experimental constraints we search for the allowed parameter space and find
that both resonance and non-resonance solutions are possible. Some typical
correlations among various observables such as thermal relic density of hidden
pions, Higgs boson signal strengths and DM-nucleon cross section are
investigated. We provide some benchmark points for experimental tests.Comment: minor corrections, version appeared in JHE
Many-Brane Extention of the Randall-Sundrum Solution
Recently, Randall and Sundrum proposed a static solution to Einstein's
equations in five spacetime dimensions with two 3-branes located at the fixed
points of to solve the hierarchy problem. We extend the solution and
construct static and also inflationary solutions to Einstein's equations in
five spacetime dimensions, one of which is compactified on , with any
number of 3-branes whose locations are taken to be arbitrary. We discuss how
the hierarchy problem can be explained in our model.Comment: PTPTeX 1.0(preprint style), 8 pages, no figures, references and typos
correcte