# Quark Masses from Gaugino Condensation in String Theories - High Energy Physics - Theory

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Abstract: We present a mechanism able to generate the perturbatively absent up-down$<{\bf 10} \cdot {\bf 10} \cdot {\bf 5}^H>$ quark Yukawa couplings ofSU5-flipped SU5 GUTS in Type II orientifold compactifications withD-branes. The mechanism works when there are SpN gauge groups involved. The${\bf {\bar 5}}$-s get charged under the SpN gauge groups and the generationof quark masses proceeds via the generation of the fermionic SpN singletcondensate $<{\bf {\bar 5} \cdot {\bar 5} \cdot {\bar 5} \cdot {\bar 5}}>$ inthe term $1-{M s^5} {\bf 10} \cdot {\bf 10} \cdot < {\bf {\bar 5} \cdot {\bar5} \cdot {\bar 5} \cdot {\bar 5}}>$. Also non-chiral states charged under Spgauge groups may become constrained by the requirement of Sp-s becomingstrongly coupled.

Author: ** Christos Kokorelis, Van E. Mayes, Dimitri V. Nanopoulos**

Source: https://arxiv.org/