Abstract
We examine methods that have been proposed for determining the helicity structure of decays of new resonances to third generation quarks and/or leptons. We present analytical and semi-analytical predictions and assess the applicability of the relevant variables in realistic reconstruction scenarios using Monte Carlo-generated events, including the effects of QCD radiation and multiple parton interactions, combinatoric ambiguities and fast detector simulation.
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B. Gripaios, Composite leptoquarks at the LHC, JHEP 02 (2010) 045 [arXiv:0910.1789] [INSPIRE].
M. Jezabek and J.H. Kuhn, Lepton spectra from heavy quark decay, Nucl. Phys. B 320 (1989) 20 [INSPIRE].
A. Czarnecki, M. Jezabek and J.H. Kuhn, Lepton spectra from decays of polarized top quarks, Nucl. Phys. B 351 (1991) 70 [INSPIRE].
J. Shelton, Polarized tops from new physics: signals and observables, Phys. Rev. D 79 (2009) 014032 [arXiv:0811.0569] [INSPIRE].
B. Bullock, K. Hagiwara and A.D. Martin, Tau polarization as a signal of charged Higgs bosons, Phys. Rev. Lett. 67 (1991) 3055 [INSPIRE].
B.K. Bullock, K. Hagiwara and A.D. Martin, Tau polarization and its correlations as a probe of new physics, Nucl. Phys. B 395 (1993) 499 [INSPIRE].
J.D. Anderson, M.H. Austern and R.N. Cahn, Measurement of Z′ couplings at future hadron colliders through decays to τ leptons, Phys. Rev. D 46 (1992) 290 [INSPIRE].
S. Gieseke et al., HERWIG ++ 2.5 release note, arXiv:1102.1672 [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].
CDF collaboration, T. Aaltonen et al., Evidence for a mass dependent forward-backward asymmetry in top quark pair production, Phys. Rev. D 83 (2011) 112003 [arXiv:1101.0034] [INSPIRE].
M. Duraisamy, A. Rashed and A. Datta, The top forward backward asymmetry with general Z ′ couplings, Phys. Rev. D 84 (2011) 054018 [arXiv:1106.5982] [INSPIRE].
M.R. Buckley, D. Hooper, J. Kopp and E. Neil, Light Z ′ bosons at the Tevatron, Phys. Rev. D 83 (2011) 115013 [arXiv:1103.6035] [INSPIRE].
B. Gripaios, A. Papaefstathiou, K. Sakurai and B. Webber, Searching for third-generation composite leptoquarks at the LHC, JHEP 01 (2011) 156 [arXiv:1010.3962] [INSPIRE].
A. Brandenburg, Z. Si and P. Uwer, QCD corrected spin analyzing power of jets in decays of polarized top quarks, Phys. Lett. B 539 (2002) 235 [hep-ph/0205023] [INSPIRE].
M. Jezabek, Top quark physics, Nucl. Phys. Proc. Suppl. 37B (1994) 197 [hep-ph/9406411] [INSPIRE].
W. Bernreuther, Top quark physics at the LHC, J. Phys. G 35 (2008) 083001 [arXiv:0805.1333] [INSPIRE].
R.M. Godbole, K. Rao, S.D. Rindani and R.K. Singh, On measurement of top polarization as a probe of \(t\overline t\) production mechanisms at the LHC, JHEP 11 (2010) 144 [arXiv:1010.1458] [INSPIRE].
R.M. Godbole, L. Hartgring, I. Niessen and C.D. White, Top polarisation studies in H − t and W t production, JHEP 01 (2012) 011 [arXiv:1111.0759] [INSPIRE].
ATLAS collaboration, G. Aad et al., Search for new phenomena in ttbar events with large missing transverse momentum in proton-proton collisions at \(\sqrt {s} = 7\;TeV\) with the ATLAS detector, Phys. Rev. Lett. 108 (2012) 041805 [arXiv:1109.4725] [INSPIRE].
CMS collaboration, S. Chatrchyan et al., Search for a vector-like quark with charge 2/3 in t + Z Events from pp collisions at \(\sqrt {s} = 7\;TeV\), Phys. Rev. Lett. 107 (2011) 271802 [arXiv:1109.4985] [INSPIRE].
S. Ovyn, X. Rouby and V. Lemaitre, DELPHES, a framework for fast simulation of a generic collider experiment, arXiv:0903.2225 [INSPIRE].
P. Bellan, Measurements of inclusive b-quark production at 7 TeV with the CMS experiment, arXiv:1109.2003 [INSPIRE].
G.P. Salam, Towards jetography, Eur. Phys. J. C 67 (2010) 637 [arXiv:0906.1833] [INSPIRE].
W.H. Press, S.A. Teukolsky, W. T. Vetterling and B. P. Flannery, Numerical recipes: the art of scientific computing, Cambridge University Press, Cambridge U.K. (2007).
A. Elagin, P. Murat, A. Pranko and A. Safonov, A new mass reconstruction technique for resonances decaying to di-τ, Nucl. Instrum. Meth. A 654 (2011) 481 [arXiv:1012.4686] [INSPIRE].
B. Gripaios, K. Sakurai and B. Webber, Polynomials, Riemann surfaces and reconstructing missing-energy events, JHEP 09 (2011) 140 [arXiv:1103.3438] [INSPIRE].
T. Plehn, M. Spannowsky and M. Takeuchi, How to improve top tagging, Phys. Rev. D 85 (2012)034029 [arXiv:1111.5034] [INSPIRE].
J. Vermaseren, New features of FORM, math-ph/0010025 [INSPIRE].
H.K. Dreiner, H.E. Haber and S.P. Martin, Two-component spinor techniques and Feynman rules for quantum field theory and supersymmetry, Phys. Rept. 494 (2010) 1 [arXiv:0812.1594] [INSPIRE].
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ArXiv ePrint: 1112.3956
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Papaefstathiou, A., Sakurai, K. Determining the helicity structure of third generation resonances. J. High Energ. Phys. 2012, 69 (2012). https://doi.org/10.1007/JHEP06(2012)069
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DOI: https://doi.org/10.1007/JHEP06(2012)069