342 research outputs found
Is an axizilla possible for di-photon resonance?
Heavy axion-like particles, called axizillas, are simple extensions of the
standard model(SM). An axizilla is required not to couple to the quarks,
leptons, and Brout-Englert-Higgs doublets of the SM, but couple to the gauge
anomalies of the and photon. It is possible to have its branching
ratios(BRs) to two photons greater than 10% and to two 's less than 10%. To
have a (production cross section)(BR to di-photons) at a
level, a TeV scale heavy quark is required for
the gluon--quark fusion process. The decay of to axizilla plus quark, and
the subsequent decay of the axizilla to two photons can be fitted at the
required level of .Comment: 9 pages of latex file with 3 figure
Self-tuning solutions of the cosmological constant
I briefly review the cosmological constant problem and attempts toward its
solution, and present the first nontrivial example for the self-tuning
mechanism with a term with the antisymmetric field strength
in a 5D RS-II setup.Comment: Latex file of 9 pages. Talk presented at SUSY'01, Dubna, Russia,
11--17 June 200
Towards unity of families: anti-SU(7) from Z(12-I) orbifold compactification
The problem of families, "Why are there three families of fermions?", is a
long awaited question to be answered within a reasonable framework. We propose
anti-SU() groups for the unification of families in grand unification (GUT)
groups, where the separation of color and weak gauge groups in the GUT is
achieved by antisymmetric tensor Brout-Englert-Higgs boson instead of an
adjoint representation. Theories of anti-SU()'s are proposed for the
unification of families. The minimal model is found as \antiSD \, GUT with the
fermion representation [3]+2[2]+8[\bar-1]. We present an example in a Z(12-I)
orbifold compactification, where the missing partner mechanism is also
realized.Comment: 24 page
Axionic domain wall number related to U(1) global symmetry
The QCD axion with at an intermediate scale, 10**9-10**12 GeV, seems in
conflict with the gravity spoil of global symmetries and may face the axionic
domain wall problem. We point out that the string compactifications with an
anomalous U(1) gauge symmetry, allowing desirable chiral matter spectra,
circumvent these two problems simultaneously.Comment: 8 pages, 2 figure
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