Top condensation as a motivated explanation of the top forwardbackward asymmetry
 Yanou Cui,
 Zhenyu Han,
 Matthew D. Schwartz
 … show all 3 hide
Rent the article at a discount
Rent now* Final gross prices may vary according to local VAT.
Get AccessAbstract
Models of top condensation can provide both a compelling solution to the hierarchy problem as well as an explanation of why the topquark mass is large. The spectrum of such models, in particular topcolorassisted technicolor, includes toppions, toprhos and the topHiggs, all of which can easily have large topcharm or topup couplings. Large topup couplings in particular would lead to a top forwardbackward asymmetry through tchannel exchange, easily consistent with the Tevatron measurements. Intriguingly, there is destructive interference between the topmesons and the standard model which conspire to make the overall top pair production rate consistent with the standard model. The rate for samesign top production is also small due to destructive interference between the neutral toppion and the topHiggs. Flavor physics is under control because new physics is mostly confined to the top quark. In this way, top condensation can explain the asymmetry and be consistent with all experimental bounds. There are many additional signatures of topcolor with large tu mixing, such as top(s) + jet(s) events, in which a top and a jet reconstruct a resonance mass, which make these models easily testable at the LHC.
 Aaltonen, T (2011) Evidence for a mass dependent forwardbackward asymmetry in top quark pair production. Phys. Rev. D 83: pp. 112003
 CDF collaboration, Measurements of the forward backward asymmetry in top pair production in the dilepton decay channel using 5.1 fb ^{−1} , CDF note 10436 (2011).
 Abazov, VM (2008) First measurement of the forwardbackward charge asymmetry in top quark pair production. Phys. Rev. Lett. 100: pp. 142002 CrossRef
 Aaltonen, T (2008) Forwardbackward asymmetry in top quark production in $ p\overline p $ collisions at $ \sqrt {s} = 1.96 $ TeV. Phys. Rev. Lett. 101: pp. 202001 CrossRef
 CDF collaboration, Measurement of the forwardbackward asymmetry in top pair production in 3.2fb ^{−1} of \( p\overline p \) collisions at \( \sqrt {s} = 1.96 \) TeV, CDF note 9724 (2009).
 Frampton, PH, Shu, J, Wang, K (2010) Axigluon as possible explanation for $ p\overline p \to t\overline t $ forwardbackward asymmetry. Phys. Lett. B 683: pp. 294
 C. Delaunay et al., Implications of the CDF \( t\overline t \) forwardbackward asymmetry for hard top physics, arXiv:1103.2297 [SPIRES].
 Delaunay, C (2011) Ultra visible warped model from flavor triviality and improved naturalness. Phys. Rev. D 83: pp. 115003
 C. Delaunay et al., Extraordinary phenomenology from warped flavor triviality, arXiv:1101.2902 [SPIRES].
 Bai, Y, Hewett, JL, Kaplan, J, Rizzo, TG (2011) LHC predictions from a Tevatron anomaly in the top quark forwardbackward asymmetry. JHEP 03: pp. 003 CrossRef
 Jung, S, Murayama, H, Pierce, A, Wells, JD (2010) Top quark forwardbackward asymmetry from new tchannel physics. Phys. Rev. D 81: pp. 015004
 Shelton, J, Zurek, KM (2011) Maximal flavor violation from new righthanded gauge bosons. Phys. Rev. D 83: pp. 091701
 Cao, J (2010) Top quark forwardbackward asymmetry at the Tevatron: a comparative study in different new physics models. Phys. Rev. D 81: pp. 014016
 Grinstein, B, Kagan, AL, Trott, M, Zupan, J (2011) Forwardbackward asymmetry in $ t\overline t $ production from flavour symmetries. Phys. Rev. Lett. 107: pp. 012002 CrossRef
 Ligeti, Z, Schmaltz, M, Tavares, GM (2011) Explaining the t tbar forwardbackward asymmetry without dijet or flavor anomalies. JHEP 06: pp. 109 CrossRef
 Jung, S, Pierce, A, Wells, JD (2011) Top quark asymmetry from a nonAbelian horizontal symmetry. Phys. Rev. D 83: pp. 114039
 A.E. Nelson, T. Okui and T.S. Roy, A unified, flavor symmetric explanation for the XXX asymmetry and Wjj excess at CDF, arXiv:1104.2030 [SPIRES].
 K.S. Babu, M. Frank and S.K. Rai, Top quark asymmetry and Wjj excess at CDF from gauged flavor symmetry, arXiv:1104.4782 [SPIRES].
 Miransky, VA, Tanabashi, M, Yamawaki, K (1989) Dynamical electroweak symmetry breaking with large anomalous dimension and t quark condensate. Phys. Lett. B 221: pp. 177
 Miransky, VA, Tanabashi, M, Yamawaki, K (1989) Is the t quark responsible for the mass of W and Z bosons?. Mod. Phys. Lett. A4: pp. 1043
 Bardeen, WA, Hill, CT, Lindner, M (1990) Minimal dynamical symmetry breaking of the standard model. Phys. Rev. D 41: pp. 1647
 Hill, CT (1991) Topcolor: top quark condensation in a gauge extension of the standard model. Phys. Lett. B 266: pp. 419
 Hill, CT (1995) Topcolor assisted technicolor. Phys. Lett. B 345: pp. 483
 Hill, CT, Simmons, EH (2003) Strong dynamics and electroweak symmetry breaking. Phys. Rept. 381: pp. 235 CrossRef
 Samuel, S (1990) Bosonic technicolor. Nucl. Phys. B 347: pp. 625 CrossRef
 Sekhar Chivukula, R, Christensen, ND, Coleppa, B, Simmons, EH (2009) The top triangle moose: combining higgsless and topcolor mechanisms for mass generation. Phys. Rev. D 80: pp. 035011
 Burdman, G, Kominis, D (1997) Modelindependent constraints on topcolor from R (b). Phys. Lett. B 403: pp. 101
 Buchalla, G, Burdman, G, Hill, CT, Kominis, D (1996) GIM violation and new dynamics of the third generation. Phys. Rev. D 53: pp. 5185
 He, HJ, Yuan, CP (1999) New method for detecting charged (pseudo)scalars at colliders. Phys. Rev. Lett. 83: pp. 28 CrossRef
 Burdman, G (1999) Scalars from top condensation models at hadron colliders. Phys. Rev. Lett. 83: pp. 2888 CrossRef
 Burdman, G, Lane, KD, Rador, T (2001) AntiB B mixing constrains topcolorassisted technicolor. Phys. Lett. B 514: pp. 41
 Chivukula, RS, Cohen, AG, Lane, KD (1990) Aspects of dynamical electroweak symmetry breaking. Nucl. Phys. B 343: pp. 554 CrossRef
 Chivukula, RS, Georgi, H (1998) LargeN and vacuum alignment in topcolor models. Phys. Rev. D 58: pp. 075004
 Fox, PJ, Ligeti, Z, Papucci, M, Perez, G, Schwartz, MD (2008) Deciphering top flavor violation at the LHC with B factories. Phys. Rev. D 78: pp. 054008
 K. Agashe, M. Papucci, G. Perez and D. Pirjol, Next to minimal flavor violation, hepph/0509117 [SPIRES].
 Hill, CT, Zhang, XM (1995) $ Z \to b\overline b $ versus dynamical electroweak symmetry breaking involving the top quark. Phys. Rev. D 51: pp. 3563
 Braam, F, Flossdorf, M, Chivukula, RS, Chiara, S, Simmons, EH (2008) Hyperchargeuniversal topcolor. Phys. Rev. D 77: pp. 055005
 Shu, J, Tait, TMP, Wang, K (2010) Explorations of the top quark forwardbackward asymmetry at the Tevatron. Phys. Rev. D 81: pp. 034012
 AguilarSaavedra, JA, PerezVictoria, M (2011) Probing the Tevatron $ t\overline t $ asymmetry at LHC. JHEP 05: pp. 034 CrossRef
 Martin, AD, Stirling, WJ, Thorne, RS, Watt, G (2009) Parton distributions for the LHC. Eur. Phys. J. C 63: pp. 189 CrossRef
 A. Pukhov, Calchep 2.3: MSSM, structure functions, event generation, 1 and generation of matrix elements for other packages, hepph/0412191 [SPIRES].
 Alwall, J (2007) MadGraph/MadEvent v4: the new web generation. JHEP 09: pp. 028 CrossRef
 CDF collaboration, Combination of CDF top quark pair production cross section measurements with 2.8fb ^{−1}, CDF note 9448 (2009).
 Aaltonen, T (2009) Search for maximal flavor violating scalars in samecharge lepton pairs in $ p\overline p $ collisions at $ \sqrt {s} = 1.96 $ TeV. Phys. Rev. Lett. 102: pp. 041801 CrossRef
 CDF Collaboration, Search for likrsign top quark pair production at CDF with 6.1fb ^{−1}, CDF note 10466 (2011). Cite Aguilar Saavedra:2011zy
 AguilarSaavedra, JA, PerezVictoria, M (2011) No likesign tops at Tevatron: constraints on extended models and implications for the $ t\overline t $ asymmetry. Phys. Lett. B 701: pp. 93
 CDF Collaboration, Search for boosted top quarks in high transverse momentum jets with 5.95 fb ^{−1} of CDF Run II Data, CDF note 10234 (2011).
 CDF collaboration, T. Aaltonen et al., First search for multijet resonances in \( \sqrt {s} = 1.96 \) TeV \( p\overline p \) collisions, arXiv:1105.2815 [SPIRES].
 Aaltonen, T (2011) Invariant mass distribution of jet pairs produced in association with a W boson in $ p\overline p $ collisions at $ \sqrt {s} = 1.96 $ TeV. Phys. Rev. Lett. 106: pp. 171801 CrossRef
 E.J. Eichten, K. Lane and A. Martin, Technicolor at the Tevatron, arXiv:1104.0976 [SPIRES].
 E. Eichten and K.D. Lane, Electroweak and flavor dynamics at hadron colliders. 2, in the proceedings of the 1996 DPF/DPB Summer Study on New Directions for HighEnergy Physics (Snowmass96), June 25–July 12, Snowmass U.S.A. (1996), hepph/9609298 [SPIRES].
 CMS collaboration, S. Chatrchyan et al., Search for samesign topquark pair production at \( \sqrt {s} = 7 \) TeV and limits on flavour changing neutral currents in the top sector, arXiv:1106.2142 [SPIRES].
 Title
 Top condensation as a motivated explanation of the top forwardbackward asymmetry
 Journal

Journal of High Energy Physics
2011:127
 Online Date
 July 2011
 DOI
 10.1007/JHEP07(2011)127
 Online ISSN
 10298479
 Publisher
 SpringerVerlag
 Additional Links
 Topics
 Keywords

 Phenomenological Models
 Heavy Quark Physics
 Hadronic Colliders
 Technicolor and Composite Models
 Industry Sectors
 Authors

 Yanou Cui ^{(1)}
 Zhenyu Han ^{(1)}
 Matthew D. Schwartz ^{(1)}
 Author Affiliations

 1. Center for the Fundamental Laws of Nature, Harvard University, Cambridge, MA, 02138, U.S.A.