Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Deformed Intersecting D6-Brane GUTS II   By employing D6-branes intersecting at angles in $D = 4$ type I strings, we
construct {\em five stack} string GUT models (PS-II class), that contain at low
energy {\em exactly the Standard model} with no extra matter and/or extra gauge
group factors. These classes of models are based on the Pati-Salam (PS) gauge
group $SU(4)_C \times SU(2)_L \times SU(2)_R$. They represent deformations
around the quark and lepton basic intersection number structure.
  The models possess the same phenomenological characteristics of some recently
discussed examples (PS-A and PS-I class) of four stack PS GUTS. Namely, there
are no colour triplet couplings to mediate proton decay and proton is stable as
baryon number is a gauged symmetry. Neutrinos get masses of the correct sizes.
Also the mass relation $m_e = m_d$ at the GUT scale is recovered.
  The conditions for the non-anomalous U(1)'s to survive massless the
Green-Schwarz mechanism are equivalent, to the conditions, coming from the
presence of N=1 supersymmetry, in sectors involving the presence of {\em extra}
branes and also required to guarantee the existence of the Majorana mass term
for the right handed neutrinos. These conditions are independent from the
number of {\em extra} U(1) branes. We also discuss the relative size of the
leading worldsheet instanton correction to the trilinear Yukawa couplings in a
general GUT model.

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The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
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The categories of this paper are: solv-int
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The categories of this paper are: patt-sol
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The categories of this paper are: q-fin
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-ex
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The categories of this paper are: stat
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The categories of this paper are: eess
5
The categories of this paper are: gr-qc
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The categories of this paper are: nlin
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The categories of this paper are: funct-an
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The categories of this paper are: econ
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The categories of this paper are: nucl-ex
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The categories of this paper are: cond-mat
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The categories of this paper are: ao-sci