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Observable contributions of new exotic quarks to quark mixing
F. del Aguila, M. Perez-Victoria, J. Santiago
Models with new vector-like quarks can produce observable quark mixing effects which are forbidden in the Standard Model. We classify all such models and write down the effective L…
Effective description of quark mixing
F. del Aguila, M. Perez-Victoria, J. Santiago
We use the effective Lagrangian formalism to describe quark mixing. The new W, Z and H couplings generalizing the CKM matrix and the GIM mechanism fulfil relations and inequalities…
Near-extremal correlators and vanishing supergravity couplings in AdS/CFT
E. D'Hoker, J. Erdmenger, D. Z. Freedman +1
We study near-extremal n-point correlation functions of chiral primary operators, in which the maximal scale dimension k is related to the others by k=\sum_i k_i-m with m equal to…
Non-renormalization of next-to-extremal correlators in N=4 SYM and the AdS/CFT correspondence
J. Erdmenger, M. Perez-Victoria
We show that next-to-extremal correlators of chiral primary operators in N=4 SYM theory do not receive quantum corrections to first order in perturbation theory. Furthermore we con…