Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-08-16
Phys.Rev. D65 (2002) 107702
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, latex, 1 figure
Scientific paper
10.1103/PhysRevD.65.107702
The mixed component of the non-commutative parameter \theta_{\mu M}, where \mu = 0,1,2,3 and M is an extra dimensional index may violate four-dimensional CPT invariance. We calculate one and two-loop induced couplings of \theta_{\mu 5} with the four-dimensional axial vector current and with the CPT odd dim=6 operators starting from five-dimensional Yukawa and U(1) theories. The resulting bounds from clock comparison experiments place a stringent constraint on \theta_{\mu 5}, |\theta_{\mu 5}|^{-1/2} > 5\times 10^{11} GeV. The orbifold projection and/or localization of fermions on a 3-brane lead to CPT-conserving physics, in which case the constraints on \theta{\mu 5} are softened.
Mocioiu Irina
Pospelov Maxim
Roiban Radu
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