quark coupling
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Author(s):  
A. Karozas ◽  
G. K. Leontaris ◽  
I. Tavellaris ◽  
N. D. Vlachos

AbstractWe study low energy implications of F-theory GUT models based on SU(5) extended by a $$U(1)'$$ U ( 1 ) ′ symmetry which couples non-universally to the three families of quarks and leptons. This gauge group arises naturally from the maximal exceptional gauge symmetry of an elliptically fibred internal space, at a single point of enhancement, $$E_8\supset SU(5)\times SU(5)'\supset SU(5)\times U(1)^4.$$ E 8 ⊃ S U ( 5 ) × S U ( 5 ) ′ ⊃ S U ( 5 ) × U ( 1 ) 4 . Rank-one fermion mass textures and a tree-level top quark coupling are guaranteed by imposing a $$Z_2$$ Z 2 monodromy group which identifies two abelian factors of the above breaking sequence. The $$U(1)'$$ U ( 1 ) ′ factor of the gauge symmetry is an anomaly free linear combination of the three remaining abelian symmetries left over by $$Z_2$$ Z 2 . Several classes of models are obtained, distinguished with respect to the $$U(1)'$$ U ( 1 ) ′ charges of the representations, and possible extra zero modes coming in vector-like representations. The predictions of these models are investigated and are compared with the LHC results and other related experiments. Particular cases interpreting the B-meson anomalies observed in LHCb and BaBar experiments are also discussed.


2020 ◽  
Vol 101 (11) ◽  
Author(s):  
J. Duarte-Campderros ◽  
G. Perez ◽  
M. Schlaffer ◽  
A. Soffer

2015 ◽  
Vol 92 (3) ◽  
Author(s):  
Gilad Perez ◽  
Yotam Soreq ◽  
Emmanuel Stamou ◽  
Kohsaku Tobioka
Keyword(s):  

2014 ◽  
Vol 59 (29-30) ◽  
pp. 3760-3770 ◽  
Author(s):  
Ya-Dong Yang ◽  
Xing-Bo Yuan

2011 ◽  
Vol 705 (3) ◽  
pp. 222-227 ◽  
Author(s):  
Chong-Xing Yue ◽  
Jue Wang ◽  
You Yu ◽  
Ting-Ting Zhang
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