Stealth QCD-like strong interactions and the tt¯ asymmetry

Joachim Brod, Jure Drobnak, Alexander L. Kagan, Emmanuel Stamou, and Jure Zupan
Phys. Rev. D 91, 095009 – Published 15 May 2015

Abstract

We show that a new strongly interacting sector can produce large enhancements of the tt¯ asymmetries at the Tevatron. The Standard Model is extended by a new vectorlike flavor triplet of fermions and one heavy scalar, all charged under a hypercolor gauge group SU(3)HC. This simple extension results in a number of new resonances. The predictions of our model are rather rigid once a small number of UV parameters is fixed, since all the strong dynamics can be directly taken over from our understanding of QCD dynamics. Despite the rather low hypercolor confinement scale of 100GeV, the new strongly interacting sector is stealth. It is shielded from present direct and indirect New Physics searches since the light resonances are QCD singlets, whereas the production of the heavier QCD colored resonances leads predominantly to high-multiplicity final states. Improved searches can potentially be devised using top tagged final states or decays into a small number of hypercolor pions.

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  • Received 23 August 2014

DOI:https://doi.org/10.1103/PhysRevD.91.095009

© 2015 American Physical Society

Authors & Affiliations

Joachim Brod1,*, Jure Drobnak2,†, Alexander L. Kagan1,‡, Emmanuel Stamou3,4,§, and Jure Zupan1,∥

  • 1Department of Physics, University of Cincinnati, Cincinnati, Ohio 45221, USA
  • 2Technische Universität München, TUM Institute for Advanced Study, Lichtenbergstrasse 2a, D-85748 Garching, Germany
  • 3Department of Particle Physics & Astrophysics, Weizmann Institute of Science, Rehovot 76100, Israel
  • 4Technische Universität München, Excellence Cluster Universe, Boltzmannstrasse 2, D-85748 Garching, Germany

  • *joachim.brod@uc.edu
  • jure.drobnak@tum.de
  • kaganalexander@gmail.com
  • §emmanuel.stamou@weizmann.ac.il
  • zupanje@ucmail.uc.edu

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Issue

Vol. 91, Iss. 9 — 1 May 2015

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