80 research outputs found
Nondecoupling of charged scalars in Higgs decay to two photons and symmetries of the scalar potential
A large class of two- and three-Higgs-doublet models with discrete symmetries
has been employed in the literature to address various aspects of flavor
physics. We analyse how the precision measurement of the Higgs to diphoton
signal strength would severely constrain these scenarios due to the
nondecoupling behavior of the charged scalars, to the extent that the number of
additional scalar doublets can be constrained no matter how heavy the
nonstandard scalars are. We demonstrate that if the scalar potential is endowed
with appropriate global continuous symmetries together with soft breaking
parameters, decoupling can be achieved thanks to the unitarity constraints on
the mass-square differences of the heavy scalars.Comment: 9 pages, 2 figures, several clarifying remarks and references added,
to appear in Phys Rev
Scalar sector properties of two-Higgs-doublet models with a global U(1) symmetry
We analyze the scalar sector properties of a general class of
two-Higgs-doublet models which has a global U(1) symmetry in the quartic terms.
We find constraints on the parameters of the potential from the considerations
of unitarity of scattering amplitudes, the global stability of the potential
and the -parameter. We concentrate on the spectrum of the non-standard
scalar masses in the decoupling limit which is preferred by the Higgs data at
the LHC. We exhibit charged-Higgs induced contributions to the diphoton decay
width of the 125\,GeV Higgs boson and its correlation with the corresponding
width.Comment: 12 pages, 15 eps figure files; minor modifications made and a few
references adde
Semi-Symmetric Metric Connection on a 3-Dimensional Trans-Sasakian Manifold
The object of the present paper is to study the nature of curvature tensor, Ricci tensor, scalar curvature and Weyl conformal curvature tensors with respect to a semi-symmetric metric connection on a 3-dimensional trans-Sasakian manifold.We have given an example regarding it
Isomerization and fluorescence depolarization of merocyanine 540 in polyacrylic acid. Effect of pH
Dynamics of isomerization and fluorescence depolarization of merocyanine 540 (MC540) in an aqueous solution of polyacrylic acid (PAA) have been studied using picosecond time resolved fluorescence spectroscopy. It is observed that the dynamics of isomerization and depolarization are sensitive enough to monitor the uncoiling of PAA at high pH (> 6). At low pH (< 3), when the polymer remains in a hypercoiled form, polymer bound MC540 experiences very high microscopic friction and, hence, the isomerization and depolarization processes are very slow. At high pH (> 6) a polyanion is formed and the polymer assumes an extended configuration due to electrostatic repulsion. At high pH(> 6), the anionic probe MC540 is expelled from the polyanion to bulk water and the dynamics of isomerization and fluorescence depolarization become faster by 12 and 5 times respectively, compared to those at low pH
- …