Abstract
The forward-backward asymmetry in top pair production at Tevatron has been reconfirmed by the CDF collaboration with 5.3 fb−1 of accumulated data. These measurements also report that the asymmetry is the largest in regions of high invariant mass \( {M_{t\overline t }} \) and rapidity difference |ΔY|. We consider light colored sextet scalars appearing in a particular non-supersymmetric SO(10) grand unification model within the 126 scalar representation. These scalar states have masses in the range of 300 GeV − 2 TeV consistent with the requirements of gauge coupling unification and bounds on the proton lifetime. The cross section and the total asymmetry can be simultaneously explained with the contributions of these scalars within 1σ. We find that the simultaneous fitting of the cross section, the total asymmetry and the asymmetries in different rapidity and \( {M_{t\overline t }} \) bins gives only a marginal improvement over the SM contribution. We also study various production mechanisms of these colored sextet scalars at the LHC.
Similar content being viewed by others
References
CDF collaboration, T. Aaltonen et al., Forward-Backward Asymmetry in Top Quark Production in \( p\overline p \) Collisions at \( \sqrt {s} = 1.96\,TeV \), Phys. Rev. Lett. 101 (2008) 202001 [arXiv:0806.2472] [SPIRES].
D0 collaboration, V.M. Abazov et al., First measurement of the forward-backward charge asymmetry in top quark pair production, Phys. Rev. Lett. 100 (2008) 142002 [arXiv:0712.0851] [SPIRES].
M.T. Bowen, S.D. Ellis and D. Rainwater, Standard model top quark asymmetry at the Fermilab Tevatron, Phys. Rev. D 73 (2006) 014008 [hep-ph/0509267] [SPIRES].
O. Antunano, J.H. Kuhn and G. Rodrigo, Top quarks, axigluons and charge asymmetries at hadron colliders, Phys. Rev. D 77 (2008) 014003 [arXiv:0709.1652] [SPIRES].
L.G. Almeida, G.F. Sterman and W. Vogelsang, Threshold Resummation for the Top Quark Charge Asymmetry, Phys. Rev. D 78 (2008) 014008 [arXiv:0805.1885] [SPIRES].
P.H. Frampton, J. Shu and K. Wang, Axigluon as Possible Explanation for \( p\overline p \to t\overline t \) Forward-Backward Asymmetry, Phys. Lett. B 683 (2010) 294 [arXiv:0911.2955] [SPIRES].
J. Cao, Z. Heng, L. Wu and J.M. Yang, Top quark forward-backward asymmetry at the Tevatron: a comparative study in different new physics models, Phys. Rev. D 81 (2010) 014016 [arXiv:0912.1447] [SPIRES].
K. Cheung, W.-Y. Keung and T.-C. Yuan, Top Quark Forward-Backward Asymmetry, Phys. Lett. B 682 (2009) 287 [arXiv:0908.2589] [SPIRES].
B. Xiao, Y.-k. Wang and S.-h. Zhu, Forward-backward asymmetry and differential cross section of top quark in flavor violating Z′ model at O(α2 s α X ), Phys. Rev. D 82 (2010) 034026 [arXiv:1006.2510] [SPIRES].
M. Bauer, F. Goertz, U. Haisch, T. Pfoh and S. Westhoff, Top-Quark Forward-Backward Asymmetry in Randall-Sundrum Models Beyond the Leading Order, JHEP 11 (2010) 039 [arXiv:1008.0742] [SPIRES].
C.-H. Chen, G. Cvetič and C.S. Kim, Forward-backward asymmetry of top quark in unparticle physics, Phys. Lett. B 694 (2011) 393 [arXiv:1009.4165] [SPIRES].
A. Djouadi, G. Moreau, F. Richard and R.K. Singh, The forward-backward asymmetry of top quark production at the Tevatron in warped extra dimensional models, Phys. Rev. D 82 (2010) 071702 [arXiv:0906.0604] [SPIRES].
E. Alvarez, L. Da Rold and A. Szynkman, A composite Higgs model analysis of forward-backward asymmetries in the production of tops at Tevatron and bottoms at LEP and SLC, arXiv:1011.6557 [SPIRES].
D.-W. Jung, P. Ko and J.S. Lee, Longitudinal top polarization as a probe of a possible origin of forward-backward asymmetry of the top quark at the Tevatron, arXiv:1011.5976 [SPIRES].
J. Cao, L. Wang, L. Wu and J.M. Yang, Top quark forward-backward asymmetry, FCNC decays and like-sign pair production as a joint probe of new physics, arXiv:1101.4456 [SPIRES].
D. Choudhury, R.M. Godbole, S.D. Rindani and P. Saha, Top polarization, forward-backward asymmetry and new physics, arXiv:1012.4750 [SPIRES].
E.L. Berger, Q.-H. Cao, C.-R. Chen, C.S. Li and H. Zhang, Top Quark Forward-Backward Asymmetry and Same-Sign Top Quark Pairs, arXiv:1101.5625 [SPIRES].
V. Barger, W.-Y. Keung and C.-T. Yu, Asymmetric Left-Right Model and the Top Pair Forward-Backward Asymmetry, Phys. Rev. D 81 (2010) 113009 [arXiv:1002.1048] [SPIRES].
S. Jung, H. Murayama, A. Pierce and J.D. Wells, Top quark forward-backward asymmetry from new t-channel physics, Phys. Rev. D 81 (2010) 015004 [arXiv:0907.4112] [SPIRES].
J. Shu, T.M.P. Tait and K. Wang, Explorations of the Top Quark Forward-Backward Asymmetry at the Tevatron, Phys. Rev. D 81 (2010) 034012 [arXiv:0911.3237] [SPIRES].
D.-W. Jung, P. Ko, J.S. Lee and S.-h. Nam, Model independent analysis of the forward-backward asymmetry of top quark production at the Tevatron, Phys. Lett. B 691 (2010) 238 [arXiv:0912.1105] [SPIRES].
A. Arhrib, R. Benbrik and C.-H. Chen, Forward-backward asymmetry of top quark in diquark models, Phys. Rev. D 82 (2010) 034034 [arXiv:0911.4875] [SPIRES].
I. Dorsner, S. Fajfer, J.F. Kamenik and N. Kosnik, Light colored scalars from grand unification and the forward-backward asymmetry in top quark pair production, Phys. Rev. D 81 (2010) 055009 [arXiv:0912.0972] [SPIRES].
I. Dorsner, S. Fajfer, J.F. Kamenik and N. Kosnik, Light Colored Scalar as Messenger of Up-Quark Flavor Dynamics in Grand Unified Theories, Phys. Rev. D 82 (2010) 094015 [arXiv:1007.2604] [SPIRES].
CDF collaboration, T. Aaltonen et al., Evidence for a Mass Dependent Forward-Backward Asymmetry in Top Quark Pair Production, arXiv:1101.0034 [SPIRES].
CDF collaboration, T. Aaltonen et al., First Measurement of the Ratio \( {{{{\sigma_{\left( {t\overline t } \right)}}}} \left/ {{{\sigma_{\left( {{{Z} \left/ {{\gamma * \to ll}} \right.}} \right)}}}} \right.} \) and Precise Extraction of the t-tbar Cross Section, Phys. Rev. Lett. 105 (2010) 012001 [arXiv:1004.3224] [SPIRES].
MCFM stands for Monte Carlo for FeMtobarn processes: http://mcfm.fnal.gov/.
CDF collaboration, T. Aaltonen et al., First Measurement of the \( t\overline t \) Differential Cross Section \( {{{d\sigma }} \left/ {{d{M_{t\overline t }}}} \right.} \) in \( p\overline p \) Collisions at \( \sqrt {s} = 1.96\,TeV \), Phys. Rev. Lett. 102 (2009) 222003 [arXiv:0903.2850] [SPIRES].
K. Cheung and T.-C. Yuan, Top Quark Forward-Backward Asymmetry in the Large Invariant Mass Region, arXiv:1101.1445 [SPIRES].
C. Delaunay, O. Gedalia, S.J. Lee, G. Perez and E. Ponton, Extraordinary Phenomenology from Warped Flavor Triviality, arXiv:1101.2902 [SPIRES].
V. Barger, W.-Y. Keung and C.-T. Yu, Tevatron Asymmetry of Tops in a W’,Z’ Model, Phys. Lett. B 698 (2011) 243 [arXiv:1102.0279] [SPIRES].
B. Bhattacherjee, S.S. Biswal and D. Ghosh, Top quark forward-backward asymmetry at Tevatron and its implications at the LHC, arXiv:1102.0545 [SPIRES].
B. Grinstein, A.L. Kagan, M. Trott and J. Zupan, Forward-backward asymmetry in t anti-t production from flavour symmetries, arXiv:1102.3374 [SPIRES].
H. Georgi and C. Jarlskog, A New Lepton-Quark Mass Relation in a Unified Theory, Phys. Lett. B 86 (1979) 297 [SPIRES].
S. Bertolini, L. Di Luzio and M. Malinsky, Intermediate mass scales in the non-supersymmetric SO(10) grand unification: a reappraisal, Phys. Rev. D 80 (2009) 015013 [arXiv:0903.4049] [SPIRES].
S. Bertolini, L. Di Luzio and M. Malinsky, On the vacuum of the minimal nonsupersymmetric SO(10) unification, Phys. Rev. D 81 (2010) 035015 [arXiv:0912.1796] [SPIRES].
A.S. Joshipura and K.M. Patel, Fermion Masses in SO(10) Models, arXiv:1102.5148 [SPIRES].
R.N. Mohapatra and B. Sakita, SO(2N) grand unification in an SU(N) basis, Phys. Rev. D 21 (1980) 1062 [SPIRES].
F. Wilczek and A. Zee, Families from Spinors, Phys. Rev. D 25 (1982) 553 [SPIRES]
C.S. Aulakh and A. Girdhar, MSGUT a la Pati-Salam: From futility to precision, Nucl. Phys. B 711 (2005) 275 [hep-ph/0405074] [SPIRES].
C.S. Aulakh and A. Girdhar, SO(10) a la Pati-Salam, Int. J. Mod. Phys. A 20 (2005) 865 [hep-ph/0204097] [SPIRES].
P. Nath and R.M. Syed, Analysis of couplings with large tensor representations in SO(2N) and proton decay, Phys. Lett. B 506 (2001) 68 [Erratum ibid. B 508 (2001) 216] [hep-ph/0103165] [SPIRES].
T. Fukuyama, A. Ilakovac, T. Kikuchi, S. Meljanac and N. Okada, General formulation for proton decay rate in minimal supersymmetric SO(10) GUT, Eur. Phys. J. C 42 (2005) 191 [hep-ph/0401213] [SPIRES].
T. Fukuyama, A. Ilakovac, T. Kikuchi, S. Meljanac and N. Okada, SO(10) group theory for the unified model building, J. Math. Phys. 46 (2005) 033505 [hep-ph/0405300] [SPIRES].
T.P. Cheng, E. Eichten and L.-F. Li, Higgs Phenomena in Asymptotically Free Gauge Theories, Phys. Rev. D9 (1974) 2259 [SPIRES].
A. Giveon, L.J. Hall and U. Sarid, SU(5) unification revisited, Phys. Lett. B 271 (1991) 138 [SPIRES].
Particle Data Group collaboration, C. Amsler et al., Review of particle physics, Phys. Lett. B 667 (2008) 1 [SPIRES].
Super-Kamiokande collaboration, H. Nishino et al., Search for Proton Decay via p → e +π0 and p → μ +π0 in a Large Water Cherenkov Detector, Phys. Rev. Lett. 102 (2009) 141801 [arXiv:0903.0676] [SPIRES].
R.N. Mohapatra and G. Senjanović, Higgs boson effects in grand unified theories, Phys. Rev. D 27 (1983) 1601 [SPIRES].
J. Pumplin, A. Belyaev, J. Huston, D. Stump and W.K. Tung, Parton distributions and the strong coupling: CTEQ6A BPDFs, JHEP 02 (2006) 032 [hep-ph/0512167] [SPIRES].
N. Kidonakis and R. Vogt, The Theoretical top quark cross section at the Tevatron and the LHC, Phys. Rev. D 78 (2008) 074005 [arXiv:0805.3844] [SPIRES].
Q.-H. Cao, D. McKeen, J.L. Rosner, G. Shaughnessy and C.E.M. Wagner, Forward-Backward Asymmetry of Top Quark Pair Production, Phys. Rev. D 81 (2010) 114004 [arXiv:1003.3461] [SPIRES].
J.M. Arnold, M. Pospelov, M. Trott and M.B. Wise, Scalar Representations and Minimal Flavor Violation, JHEP 01 (2010) 073 [arXiv:0911.2225] [SPIRES].
CDF collaboration, T. Aaltonen et al., Search for new particles decaying into dijets in proton-antiproton collisions at \( \sqrt {s} = 1.96\,TeV \), Phys. Rev. D 79 (2009) 112002 [arXiv:0812.4036] [SPIRES].
C.-H. Chen, Colored scalars on \( {D^0} \to {\overline D^0} \) mixing in diquark models, Phys. Lett. B 680 (2009) 133 [arXiv:0902.2620] [SPIRES].
R.N. Mohapatra, N. Okada and H.-B. Yu, Diquark Higgs at LHC, Phys. Rev. D 77 (2008) 011701 [arXiv:0709.1486] [SPIRES].
E.L. Berger, Q.-H. Cao, C.-R. Chen, G. Shaughnessy and H. Zhang, Color Sextet Scalars in Early LHC Experiments, Phys. Rev. Lett. 105 (2010) 181802 [arXiv:1005.2622] [SPIRES].
T. Han, I. Lewis and T. McElmurry, QCD Corrections to Scalar Diquark Production at Hadron Colliders, JHEP 01 (2010) 123 [arXiv:0909.2666] [SPIRES].
C.-R. Chen, W. Klemm, V. Rentala and K. Wang, Color Sextet Scalars at the CERN Large Hadron Collider, Phys. Rev. D 79 (2009) 054002 [arXiv:0811.2105] [SPIRES].
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Patel, K.M., Sharma, P. Forward-backward asymmetry in top quark production from light colored scalars in SO(10) model. J. High Energ. Phys. 2011, 85 (2011). https://doi.org/10.1007/JHEP04(2011)085
Received:
Revised:
Accepted:
Published:
DOI: https://doi.org/10.1007/JHEP04(2011)085