348 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
Single Z' production at CLIC based on e^- gamma collisions
We analyze the potential of CLIC based on e- gamma collisions to search for
new gauge boson. Single Z' production at e-gamma colliders in two SU(3)_C
X SU(3)_L X U(1)_N models: the minimal model and the model with right-handed
(RH) neutrinos is studied in detail. Results show that new Z' gauge bosons can
be observed at the CLIC, and the cross sections in the model with RH neutrinos
are bigger than those in the minimal one.Comment: 11 pages, 4 figures, To appear in JET
Fabrication and hardness of in-situ Al3Ti–Al2O3 composite
In this work, an in-situ Al3Ti–Al2O3 composite was optimally synthesized from raw powders via mechanical milling and conventional sintering processes. The strong influence of milling time on the promotion of the phase reaction between the initial TiO2 and Al materials was proven by using X-ray diffraction and surface morphology analysis. The obtained results showed that the milling process did not initiate any reaction between the raw TiO2 and Al materials. However, the milling process was important for creating a homogeneous powder mixture and refining the particle size of the powders. The Al3Ti–Al2O3 composites were completely formed after conventional sintering at 750°C for 30 min for a milling time of over 4 h. The highest obtained microhardness of the composite was approximately 130 HV, which was suggested to be related to the microstructure of the bulk composite specimen consisting of two main phases, the Al3Ti matrix and the Al2O3 particles dispersed in the matrix. A small portion of an unidentified phase, a Ti-rich compound, was found in the matrix together with a tiny fraction of AlTi3. We suggest that the optimal sintering process and mechanical milling are important key factors in fabricating bulk hardness Al3Ti–Al2O3 composite materials
(g-2)_{e, mu} and decays e_b--> e_a\gamma in a SU(4)_L x U(1)_X model with inverse seesaw neutrinos
We will show that the 3-4-1 model with heavy right-handed neutrinos can
explain the recent experimental data of (g-2)_{e, mu} anomalies of charged
leptons and neutrino oscillations through the inverse seesaw mechanism. In
addition, the model can predict large lepton flavor violating decay rates mu
--> e gamma and tau --> mu gamma, e gamma up to the recent experimental
sensitivitiesComment: 28 pages, 8 figure
30S Beam Development and X-ray Bursts
Over the past three years, we have worked on developing a well-characterized
30S radioactive beam to be used in a future experiment aiming to directly
measure the 30S(alpha,p) stellar reaction rate within the Gamow window of Type
I X-ray bursts. The importance of the 30S(alpha,p) reaction to X-ray bursts is
discussed. Given the astrophysical motivation, the successful results of and
challenges involved in the production of a low-energy 30S beam are detailed.
Finally, an overview of our future plans regarding this on-going project are
presented.Comment: 7 pages, 2 figures, 5th European Summer School on Experimental
Nuclear Astrophysics, Santa Tecla, Sicily, September 200
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