Low-scale warped extra dimension and its predilection for multiple top quarksReport as inadecuate




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Journal of High Energy Physics

, 2010:1

First Online: 04 November 2010Received: 21 August 2010Accepted: 04 October 2010

Abstract

Within warped extra dimension models that explain flavor through geometry, flavor changing neutral current constraints generally force the Kaluza-Klein scale to be above many TeV. This creates tension with a natural electroweak scale. On the other hand, a much lower scale compatible with precision electroweak and flavor changing neutral current constraints is allowed if we decouple the Kaluza-Klein states of Standard Model gauge bosons from light fermions clight ≃ cb ≃ 0.5 bulk mass parameters. The main signature for this approach is four top quark production via the Kaluza-Klein excitations’ strong coupling to top quarks. We study single lepton, like-sign dilepton, and trilepton observables of four-top events at the Large Hadron Collider. The like-sign dilepton signature typically has the largest discovery potential for a strongly coupled right-handed top case MKK ∼ 2 − 2.5 TeV, while single lepton is the better when the left-handed top couples most strongly MKK ∼ 2 TeV. We also describe challenging lepton-jet collimation issues in the like-sign dilepton and trilepton channels. An alternative single lepton observable is considered which takes advantage of the many bottom quarks in the final state. Although searches of other particles may compete, we find that four top production via Kaluza-Klein gluons is most promising in a large region of this parameter space.

KeywordsPhenomenology of Field Theories in Higher Dimensions ArXiv ePrint: 1008.0870

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Author: Sunghoon Jung - James D. Wells

Source: https://link.springer.com/







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