Abstract
We explore the four top signal \( t\bar{t}t\bar{t} \) at the 7TeV Large Hadron Collider as a probe of physics beyond the standard model. Enhancement of the corresponding cross-section with respect to the Standard Model value can probe the electroweak symmetry breaking sector or test extra dimensional models with heavy Kaluza-Klein gluons and quarks. We perform a detailed analysis including background and detector simulation in the specific case of a universal extra-dimensional model with two extra dimensions compactified using the geometry of the real projective plane. For masses around 600 GeV, a discovery is possible for an effective cross section above 210 fb (36 fb) for 1/fb (10/fb) of integrated luminosity. This implies a branching ratio in tops of the (1, 1) heavy photon above 13% (5%). Furthermore, the 4-top signal from the (2, 0) and (0, 2) tiers can be discovered with an integrated luminosity of 3.5/fb. The results of our simulation can be easily adapted to other models since the background processes are identical. Concerning the signal, typical production mechanisms for the \( t\bar{t}t\bar{t} \) signal are similar even if cross-section values may vary considerably depending on the model and the spectrum of the new particles.
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References
K.-m. Cheung, Four top production and electroweak symmetry breaking, hep-ph/9507411 [SPIRES].
M. Spira and J.D. Wells, Higgs bosons strongly coupled to the top quark, Nucl. Phys. B 523 (1998) 3 [hep-ph/9711410] [SPIRES].
C.T. Hill and E.H. Simmons, Strong dynamics and electroweak symmetry breaking, Phys. Rept. 381 (2003) 235 [hep-ph/0203079] [SPIRES].
A. Pomarol and J. Serra, Top quark compositeness: feasibility and implications, Phys. Rev. D 78 (2008) 074026 [arXiv:0806.3247] [SPIRES].
K. Kumar, T.M.P. Tait and R. Vega-Morales, Manifestations of top compositeness at colliders, JHEP 05 (2009) 022 [arXiv:0901.3808] [SPIRES].
M. Frigerio, J. Serra and A. Varagnolo, Composite GUTs: models and expectations at the LHC, JHEP 06 (2011) 029 [arXiv:1103.2997] [SPIRES].
G.L. Kane, E. Kuflik, R. Lu and L.-T. Wang, Top channel for early SUSY discovery at the LHC, arXiv:1101.1963 [SPIRES].
S. Jung and J.D. Wells, Low-scale warped extra dimension and its predilection for multiple top quarks, JHEP 11 (2010) 001 [arXiv:1008.0870] [SPIRES].
G. Cacciapaglia, A. Deandrea and J. Llodra-Perez, A dark matter candidate from Lorentz invariance in 6 dimensions, JHEP 03 (2010) 083 [arXiv:0907.4993] [SPIRES].
G. Jungman, M. Kamionkowski and K. Griest, Supersymmetric dark matter, Phys. Rept. 267 (1996) 195 [hep-ph/9506380] [SPIRES].
G. Bertone, D. Hooper and J. Silk, Particle dark matter: evidence, candidates and constraints, Phys. Rept. 405 (2005) 279 [hep-ph/0404175] [SPIRES].
I. Low, T parity and the littlest Higgs, JHEP 10 (2004) 067 [hep-ph/0409025] [SPIRES].
T. Appelquist, H.-C. Cheng and B.A. Dobrescu, Bounds on universal extra dimensions, Phys. Rev. D 64 (2001) 035002 [hep-ph/0012100] [SPIRES].
G. Servant and T.M.P. Tait, Is the lightest Kaluza-Klein particle a viable dark matter candidate?, Nucl. Phys. B 650 (2003) 391 [hep-ph/0206071] [SPIRES].
A. Hebecker, Grand unification in the projective plane, JHEP 01 (2004) 047 [hep-ph/0309313] [SPIRES].
B.A. Dobrescu and E. Ponton, Chiral compactification on a square, JHEP 03 (2004) 071 [hep-th/0401032] [SPIRES].
E. Ponton and L. Wang, Radiative effects on the chiral square, JHEP 11 (2006) 018 [hep-ph/0512304] [SPIRES].
H. Dohi and K.-y. Oda, Universal extra dimensions on real projective plane, Phys. Lett. B 692 (2010) 114 [arXiv:1004.3722] [SPIRES].
J. Llodra-Perez, Effective models of new physics at the Large Hadron Collider, Ph.D. Thesis, University Claude Bernard (Lyon 1), Lyon France (2011).
G. Cacciapaglia, A. Deandrea and B. Kubik-Deriaz, in preparation.
G. Burdman, B.A. Dobrescu and E. Ponton, Resonances from two universal extra dimensions, Phys. Rev. D 74 (2006) 075008 [hep-ph/0601186] [SPIRES].
G. Cacciapaglia, A. Deandrea and J. Llodra-Perez, The universal real projective plane: LHC phenomenology at one loop, arXiv:1104.3800 [SPIRES].
J. Alwall et al., MadGraph/MadEvent v4: the new web generation, JHEP 09 (2007) 028 [arXiv:0706.2334] [SPIRES].
N.D. Christensen and C. Duhr, FeynRules — Feynman rules made easy, Comput. Phys. Commun. 180 (2009) 1614 [arXiv:0806.4194] [SPIRES].
T. Sjöstrand, S. Mrenna and P.Z. Skands, PYTHIA 6.4 physics and manual, JHEP 05 (2006) 026 [hep-ph/0603175] [SPIRES].
J. Pumplin et al., New generation of parton distributions with uncertainties from global QCD analysis, JHEP 07 (2002) 012 [hep-ph/0201195] [SPIRES].
N. Kidonakis, Higher-order corrections to top-antitop pair and single top quark production, arXiv:0909.0037 [SPIRES].
S. Ovyn, X. Rouby and V. Lemaitre, Delphes, a framework for fast simulation of a generic collider experiment, arXiv:0903.2225 [SPIRES].
M. Cacciari and G.P. Salam, Dispelling the N 3 myth for the k t jet-finder, Phys. Lett. B 641 (2006) 57 [hep-ph/0512210] [SPIRES].
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Cacciapaglia, G., Chierici, R., Deandrea, A. et al. Four tops on the real projective plane at LHC. J. High Energ. Phys. 2011, 42 (2011). https://doi.org/10.1007/JHEP10(2011)042
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DOI: https://doi.org/10.1007/JHEP10(2011)042