Abstract
We define a lepton-based asymmetry in semi-leptonic \( t\overline{t} \) production at the LHC. We show that the ratio of this lepton-based asymmetry and the \( t\overline{t} \) charge asymmetry, measured as a function of the lepton transverse momentum or the \( t\overline{t} \) invariant mass is a robust observable in the Standard Model. It is stable against higher order corrections and mis-modeling effects. We show that this ratio can be also a powerful discriminant among different models of new physics and between them and the Standard Model. Finally, we show that a related ratio defined at the Tevatron is also robust as a function of the \( t\overline{t} \) invariant mass.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
M.S. Carena, E. Ponton, J. Santiago and C.E.M. Wagner, Electroweak constraints on warped models with custodial symmetry, Phys. Rev. D 76 (2007) 035006 [hep-ph/0701055] [INSPIRE].
A. Atre, M. Carena, T. Han and J. Santiago, Heavy Quarks Above the Top at the Tevatron, Phys. Rev. D 79 (2009) 054018 [arXiv:0806.3966] [INSPIRE].
C. Delaunay, O. Gedalia, S.J. Lee, G. Perez and E. Ponton, Ultra Visible Warped Model from Flavor Triviality and Improved Naturalness, Phys. Rev. D 83 (2011) 115003 [arXiv:1007.0243] [INSPIRE].
C. Delaunay, O. Gedalia, S.J. Lee, G. Perez and E. Ponton, Extraordinary Phenomenology from Warped Flavor Triviality, Phys. Lett. B 703 (2011) 486 [arXiv:1101.2902] [INSPIRE].
M. Redi and A. Weiler, Flavor and CP Invariant Composite Higgs Models, JHEP 11 (2011) 108 [arXiv:1106.6357] [INSPIRE].
A. Atre, M. Chala and J. Santiago, Searches for New Vector Like Quarks: Higgs Channels, JHEP 05 (2013) 099 [arXiv:1302.0270] [INSPIRE].
C. Delaunay, C. Grojean and G. Perez, Modified Higgs Physics from Composite Light Flavors, JHEP 09 (2013) 090 [arXiv:1303.5701] [INSPIRE].
L. Da Rold, C. Delaunay, C. Grojean and G. Perez, Up Asymmetries From Exhilarated Composite Flavor Structures, JHEP 02 (2013) 149 [arXiv:1208.1499] [INSPIRE].
J.H. Kuhn and G. Rodrigo, Charge asymmetry of heavy quarks at hadron colliders, Phys. Rev. D 59 (1999) 054017 [hep-ph/9807420] [INSPIRE].
J.H. Kuhn and G. Rodrigo, Charge asymmetry in hadroproduction of heavy quarks, Phys. Rev. Lett. 81 (1998) 49 [hep-ph/9802268] [INSPIRE].
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] [INSPIRE].
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] [INSPIRE].
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] [INSPIRE].
CDF collaboration, T. Aaltonen et al., Measurement of the top quark forward-backward production asymmetry and its dependence on event kinematic properties, Phys. Rev. D 87 (2013) 092002 [arXiv:1211.1003] [INSPIRE].
D0 collaboration, V.M. Abazov et al., Forward-backward asymmetry in top quark-antiquark production, Phys. Rev. D 84 (2011) 112005 [arXiv:1107.4995] [INSPIRE].
W. Bernreuther and Z.-G. Si, Top quark and leptonic charge asymmetries for the Tevatron and LHC, Phys. Rev. D 86 (2012) 034026 [arXiv:1205.6580] [INSPIRE].
CDF collaboration, T.A. Aaltonen et al., Measurement of the leptonic asymmetry in \( t\overline{t} \) events produced in \( p\overline{p} \) collisions at \( \sqrt{s} \) = 1.96 TeV, Phys. Rev. D 88 (2013) 072003 [arXiv:1308.1120] [INSPIRE].
D0 collaboration, Forward-backward asymmetry in the distribution of leptons in \( t\overline{t} \) events, D0 Note 6381-CONF.
CDF collaboration, Measurement of the Leptonic Forward-Backward Asymmetry of tt Production and Decay in the Dilepton Final State and Combination of Charge Weighted Leptonic AFB at CDF, CDF Note 11035.
D0 collaboration, V.M. Abazov et al., Measurement of the asymmetry in angular distributions of leptons produced in dilepton \( t\overline{t} \) final states in \( p\overline{p} \) collisions at \( \sqrt{s} \) = 1.96 TeV, Phys. Rev. D 88 (2013) 112002 [arXiv:1308.6690] [INSPIRE].
S. Berge and S. Westhoff, Top-Quark Charge Asymmetry Goes Forward: Two New Observables for Hadron Colliders, JHEP 07 (2013) 179 [arXiv:1305.3272] [INSPIRE].
A. Falkowski, M.L. Mangano, A. Martin, G. Perez and J. Winter, Data driving the top quark forward-backward asymmetry with a lepton-based handle, Phys. Rev. D 87 (2013) 034039 [arXiv:1212.4003] [INSPIRE].
A. Falkowski, G. Perez and M. Schmaltz, Spinning the Top, Phys. Rev. D 87 (2013) 034041 [arXiv:1110.3796] [INSPIRE].
E.L. Berger, Q.-H. Cao, C.-R. Chen, J.-H. Yu and H. Zhang, Dynamical Origin of the Correlation between the Asymmetries \( {A}_{F\; B}^t \) and \( {A}_{F\; B}^{\ell } \) , arXiv:1111.3641 [INSPIRE].
E.L. Berger, Q.-H. Cao, C.-R. Chen, J.-H. Yu and H. Zhang, The Top Quark Production Asymmetries \( {A}_{F\; B}^t \) and \( {A}_{F\; B}^{\ell } \) , Phys. Rev. Lett. 108 (2012) 072002 [arXiv:1201.1790] [INSPIRE].
E.L. Berger, Q.-H. Cao, C.-R. Chen and H. Zhang, Interpretations and implications of the top quark rapidity asymmetries \( {A}_{F\; B}^t \) and \( {A}_{F\; B}^{\ell } \) , Phys. Rev. D 88 (2013) 014033 [arXiv:1209.4899] [INSPIRE].
M. Baumgart and B. Tweedie, Transverse Top Quark Polarization and the \( t\overline{t} \) Forward-Backward Asymmetry, JHEP 08 (2013) 072 [arXiv:1303.1200] [INSPIRE].
K. Agashe, A. Belyaev, T. Krupovnickas, G. Perez and J. Virzi, LHC Signals from Warped Extra Dimensions, Phys. Rev. D 77 (2008) 015003 [hep-ph/0612015] [INSPIRE].
J. Drobnak, J.F. Kamenik and J. Zupan, Flipping \( t\overline{t} \) Asymmetries at the Tevatron and the LHC, Phys. Rev. D 86 (2012) 054022 [arXiv:1205.4721] [INSPIRE].
J. Drobnak, A.L. Kagan, J.F. Kamenik, G. Perez and J. Zupan, Forward Tevatron Tops and Backward LHC Tops with Associates, Phys. Rev. D 86 (2012) 094040 [arXiv:1209.4872] [INSPIRE].
J.A. Aguilar-Saavedra and A. Juste, Collider-independent t tbar forward-backward asymmetries, Phys. Rev. Lett. 109 (2012) 211804 [arXiv:1205.1898] [INSPIRE].
E. Alvarez and E.C. Leskow, A charged Z’ to conciliate the apparent disagreement between top-antitop Tevatron forward-backward asymmetry and LHC charge asymmetry, Phys. Rev. D 86 (2012) 114034 [arXiv:1209.4354] [INSPIRE].
ATLAS collaboration, Measurement of the top quark pair production charge asymmetry in proton-proton collisions at \( \sqrt{s} \) = 7 TeV using the ATLAS detector, ATLAS-CONF-2013-078 (2013).
CMS collaboration, Inclusive and differential measurements of the \( t\overline{t} \) charge asymmetry in proton-proton collisions at 7 TeV, Phys. Lett. B 717 (2012) 129 [arXiv:1207.0065] [INSPIRE].
CMS collaboration, Measurement of the ttbar charge asymmetry with lepton+jets events at 8 TeV, CMS-PAS-TOP-12-033 (2013).
ATLAS collaboration, Measurement of the charge asymmetry in dileptonic decay of top quark pairs in pp collisions at \( \sqrt{s} \) = 7 TeV using the ATLAS detector, ATLAS-CONF-2012-057 (2012).
CMS collaboration, Top charge asymmetry measurement in dileptons at 7 TeV, CMS-PAS-TOP-12-010 (2012).
S. Frixione and B.R. Webber, Matching NLO QCD computations and parton shower simulations, JHEP 06 (2002) 029 [hep-ph/0204244] [INSPIRE].
S. Frixione, P. Nason and B.R. Webber, Matching NLO QCD and parton showers in heavy flavor production, JHEP 08 (2003) 007 [hep-ph/0305252] [INSPIRE].
S. Alioli, P. Nason, C. Oleari and E. Re, A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX, JHEP 06 (2010) 043 [arXiv:1002.2581] [INSPIRE].
H.-L. Lai et al., New parton distributions for collider physics, Phys. Rev. D 82 (2010) 074024 [arXiv:1007.2241] [INSPIRE].
J.H. Kuhn and G. Rodrigo, Charge asymmetries of top quarks at hadron colliders revisited, JHEP 01 (2012) 063 [arXiv:1109.6830] [INSPIRE].
G. Corcella et al., HERWIG 6: An Event generator for hadron emission reactions with interfering gluons (including supersymmetric processes), JHEP 01 (2001) 010 [hep-ph/0011363] [INSPIRE].
T. Sjöstrand, L. Lönnblad, S. Mrenna and P.Z. Skands, PYTHIA 6.3 physics and manual, hep-ph/0308153 [INSPIRE].
J.A. Aguilar-Saavedra and M. Pérez-Victoria, Asymmetries in \( t\overline{t} \) production: LHC versus Tevatron, Phys. Rev. D 84 (2011) 115013 [arXiv:1105.4606] [INSPIRE].
J.A. Aguilar-Saavedra and M. Pérez-Victoria, Simple models for the top asymmetry: Constraints and predictions, JHEP 09 (2011) 097 [arXiv:1107.0841] [INSPIRE].
S. Fajfer, J.F. Kamenik and B. Melic, Discerning New Physics in Top-Antitop Production using Top Spin Observables at Hadron Colliders, JHEP 08 (2012) 114 [arXiv:1205.0264] [INSPIRE].
CDF and D0 collaborations, T.A. Aaltonen et al., Combination of measurements of the top-quark pair production cross section from the Tevatron Collider, Phys. Rev. D 89 (2014) 072001 [arXiv:1309.7570] [INSPIRE].
M. Czakon, P. Fiedler and A. Mitov, Total Top-Quark Pair-Production Cross Section at Hadron Colliders Through \( O\left({\alpha}_S^4\right) \), Phys. Rev. Lett. 110 (2013) 252004 [arXiv:1303.6254] [INSPIRE].
CDF collaboration, T. Aaltonen et al., First Measurement of the \( t\overline{t} \) Differential Cross Section d sigma/dM( \( t\overline{t} \) ) in \( p\overline{p} \) Collisions at \( \sqrt{s} \) = 1.96 TeV, Phys. Rev. Lett. 102 (2009) 222003 [arXiv:0903.2850] [INSPIRE].
D0 collaboration, Measurement of the differential \( t\overline{t} \) production cross section in \( p\overline{p} \) collisions at \( \sqrt{s} \) = 1.96 TeV with the D0 Detector, D0 Conference note 6379 (2013).
CMS collaboration, Searches for new physics using the \( t\overline{t} \) invariant mass distribution in pp collisions at \( \sqrt{s} \) = 8 TeV, Phys. Rev. Lett. 111 (2013) 211804 [arXiv:1309.2030] [INSPIRE].
L.J. Hall and A.E. Nelson, Heavy Gluons and Monojets, Phys. Lett. B 153 (1985) 430 [INSPIRE].
P.H. Frampton and S.L. Glashow, Chiral Color: An Alternative to the Standard Model, Phys. Lett. B 190 (1987) 157 [INSPIRE].
G. Marques Tavares and M. Schmaltz, Explaining the \( t\overline{t} \) asymmetry with a light axigluon, Phys. Rev. D 84 (2011) 054008 [arXiv:1107.0978] [INSPIRE].
J.A. Aguilar-Saavedra and M. Pérez-Victoria, Shaping the top asymmetry, Phys. Lett. B 705 (2011) 228 [arXiv:1107.2120] [INSPIRE].
J.A. Aguilar-Saavedra and J. Santiago, Four tops and the \( t\overline{t} \) forward-backward asymmetry, Phys. Rev. D 85 (2012) 034021 [arXiv:1112.3778] [INSPIRE].
C. Gross, G. Marques Tavares, M. Schmaltz and C. Spethmann, Light axigluon explanation of the Tevatron \( t\overline{t} \) asymmetry and multijet signals at the LHC, Phys. Rev. D 87 (2013) 014004 [arXiv:1209.6375] [INSPIRE].
M. Gresham, J. Shelton and K.M. Zurek, Open windows for a light axigluon explanation of the top forward-backward asymmetry, JHEP 03 (2013) 008 [arXiv:1212.1718] [INSPIRE].
R. Barcelo, A. Carmona, M. Masip and J. Santiago, Stealth gluons at hadron colliders, Phys. Lett. B 707 (2012) 88 [arXiv:1106.4054] [INSPIRE].
S. Jung, A. Pierce and J.D. Wells, Top quark asymmetry from a non-Abelian horizontal symmetry, Phys. Rev. D 83 (2011) 114039 [arXiv:1103.4835] [INSPIRE].
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] [INSPIRE].
J.A. Aguilar-Saavedra and M. Pérez-Victoria, No like-sign tops at Tevatron: Constraints on extended models and implications for the t tbar asymmetry, Phys. Lett. B 701 (2011) 93 [arXiv:1104.1385] [INSPIRE].
J. Alwall, M. Herquet, F. Maltoni, O. Mattelaer and T. Stelzer, MadGraph 5: Going Beyond, JHEP 06 (2011) 128 [arXiv:1106.0522] [INSPIRE].
D0 collaboration, Forward-backward asymmetry in the distribution of leptons in \( t\overline{t} \) events, D0 Conference note 6394 (2013).
A.D. Martin, W.J. Stirling, R.S. Thorne and G. Watt, Parton distributions for the LHC, Eur. Phys. J. C 63 (2009) 189 [arXiv:0901.0002] [INSPIRE].
M. Cacciari, G.P. Salam and G. Soyez, FastJet User Manual, Eur. Phys. J. C 72 (2012) 1896 [arXiv:1111.6097] [INSPIRE].
Open Access
This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
Author information
Authors and Affiliations
Corresponding author
Additional information
ArXiv ePrint: 1401.2443
Rights and permissions
Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0), which permits use, duplication, adaptation, distribution, and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
About this article
Cite this article
Carmona, A., Chala, M., Falkowski, A. et al. From Tevatron’s top and lepton-based asymmetries to the LHC. J. High Energ. Phys. 2014, 5 (2014). https://doi.org/10.1007/JHEP07(2014)005
Received:
Revised:
Accepted:
Published:
DOI: https://doi.org/10.1007/JHEP07(2014)005