1,762,259 research outputs found
Higgs revised in Supersymmetric Economical 3-3-1 model with B/\mu-type terms
We re-investigate the scalar potential and the Higgs sector of the
supersymmetric economical 3-3-1 model (SUSYE331) in the presence of the B/\mu
type terms which has many important consequences. First, the model contains no
massless Higgs fields. Second, we prove that the soft mass parameters of
Higgses must be at the SU(3)_L scale. As a result, the masses of the Higgses
drift toward this scale except one light real neutral Higgs with the mass of
m_Z|cos(2\gamma)| at the tree level. We also show that there are some Higgses
containing many properties of the Higgses in the minimal supersymmetric
standard model (MSSM), especially in the neutral Higgs sector. One exact
relation in the MSSM, m^2_H^{+/-}=m^2_A+m^2_W, is still true in the SUSYE331.
Based on this result we make some comments on the lepton flavor violating
decays of these Higgses as one of signatures of new physics in the SUSYE331
model which may be detected by present colliders.Comment: Matches version accepted for publication in EPJC. Typos are
corrected. We add a new section, a new appendix, a new figure and new
references to explain more clearly the properties of the lightest neutral
Higgs. Results unchange
Varieties with too many rational points
We investigate Fano varieties defined over a number field that contain
subvarieties whose number of rational points of bounded height is comparable to
the total number on the variety.Comment: 23 page
Topologically protected surface Majorana arcs and bulk Weyl fermions in ferromagnetic superconductors
A number of ferromagnetic superconductors have been recently discovered which
are believed to be in the so-called "equal spin pairing" (ESP) state. In the
ESP state the Cooper pairs condense forming order parameters
which are decoupled
in the spin-sector. We show that these three-dimensional systems should
generically support topologically protected surface Majorana arcs and bulk Weyl
fermions as gapless excitations. Similar protected low-energy exotic
quasiparticles should also appear in the recently discovered
non-centrosymmteric superconductors in the presence of a Zeeman field. The
protected surface arcs can be probed by angle-resolved photoemission (ARPES) as
well as scanning tunneling microscope (STM) experiments.Comment: 5 pages and 2 figures; Figure 2 revised, typos correcte
Influence of QED Corrections on the Orientation of Chiral Symmetry Breaking in the NJL model
We study QED corrections to chiral symmetry breaking in the
Nambu--Jona-Lasinio (NJL) model with two flavors of quarks. In this model, the
isospin symmetry is broken by the differences between the current quark masses
and the electromagnetic charges of the up and down quarks. To leading order in
the 1/N expansion, we calculate the effective potential of the model with
one-loop QED corrections at finite temperature.
Evaluating the effective potential, we study the influence of the isospin
symmetry breaking on the orientation of chiral symmetry breaking.
The current quark mass plays an essential role in maintaining the orientation
of the chiral symmetry breaking.
If the average of the up and down quark masses is small enough, we find a
phase in which the pion field has non-vanishing expectation value and dynamical
CP violation takes place.Comment: 22 pages, 13 figures; added discussion about pion mass differenc
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