Light Kaluza Klein States in Randall-Sundrum Models with Custodial SU(2)

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We consider Randall-Sundrum scenarios based on SU(2){sub L} x SU(2){sub R} and a discrete parity exchanging L with R. The custodial and parity symmetries can be used to make the tree level contribution to the T parameter and the anomalous couplings of the bottom quark to the Z very small. We show that the resulting quantum numbers typically induce a negative T parameter at one loop that, together with the positive value of the S parameter, restrict considerably these models. There are nevertheless regions of parameter space that successfully reproduce the fit to electroweak precision observables with light Kaluza-Klein excitations ... continued below

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34 pages

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Carena, Marcela; Ponton, Eduardo; Santiago, Jose & Wagner, Carlos E. M. July 1, 2006.

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We consider Randall-Sundrum scenarios based on SU(2){sub L} x SU(2){sub R} and a discrete parity exchanging L with R. The custodial and parity symmetries can be used to make the tree level contribution to the T parameter and the anomalous couplings of the bottom quark to the Z very small. We show that the resulting quantum numbers typically induce a negative T parameter at one loop that, together with the positive value of the S parameter, restrict considerably these models. There are nevertheless regions of parameter space that successfully reproduce the fit to electroweak precision observables with light Kaluza-Klein excitations accessible at colliders. We consider models of gauge-Higgs unification that implement the custodial and parity symmetries and find that the electroweak data singles out a very well defined region in parameter space. In this region one typically finds light gauge boson Kaluza-Klein excitations as well as light SU(2){sub L} singlet, and sometimes also doublet, fermionic states, that mix with the top quark, and that may yield interesting signatures at future colliders.

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34 pages

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  • Journal Name: Nucl.Phys.B759:202-227,2006

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  • Report No.: FERMILAB-PUB-06-234-T
  • Grant Number: AC02-07CH11359
  • DOI: 10.1016/j.nuclphysb.2006.10.012 | External Link
  • Office of Scientific & Technical Information Report Number: 900004
  • Archival Resource Key: ark:/67531/metadc880041

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  • July 1, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • July 25, 2017, 2:05 p.m.

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Carena, Marcela; Ponton, Eduardo; Santiago, Jose & Wagner, Carlos E. M. Light Kaluza Klein States in Randall-Sundrum Models with Custodial SU(2), article, July 1, 2006; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc880041/: accessed September 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.