Handbook of vectorlike quarks: mixing and single production
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American Physical Society
Vector-like quarksHigh Energy PhysicsPhenomenology
Aguilar-Saavedra, J.A.; et al. Handbook of vector-like quarks: mixing and single production. Physical Review D, 88 (9): 094010 (2013). [http://hdl.handle.net/10481/30469]
PatrocinadorThis work has been supported by MICINN by projects FPA2006-05294, FPA2010-17915, FPA2010-22163-C02-01 and by the Consolider- Ingenio 2010 Program under grant MultiDark CSD2009-00064; by Junta de Andalucía (FQM 101, FQM 03048 and FQM 6552) and by Fundaçao para a Ciencia e Tecnologia (FCT) project CERN/ FP/123619/2011. The work of R.B. was supported by the Spanish Consejo Superior de Investigaciones Científicas (CSIC).
We obtain constraints on the mixing of vector-like quarks coupling predominantly to the third generation. We consider all (seven) relevant types of vector-like quarks, individually. The constraints are derived from oblique corrections and Z -> b bbar measurements at LEP and SLC. We investigate the implications of these constraints on LHC phenomenology, concerning the decays of the heavy quarks and their single production. We also explore indirect effects of heavy quark mixing in top and bottom couplings. A remarkable effect is the possibility of explaining the anomalous forward-backward asymmetry in Z -> b bbar at LEP, with a hypercharge -5/6 doublet. We also study the impact of the new quarks on single Higgs production at the LHC and Higgs decay.