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On the next-to-leading order QCD \( \mathcal{K} \)-factor for \( t\overline t b\overline b \) production at the TeVatron. (English) Zbl 1309.81341
Summary: Motivated by ongoing experimental analyses, we report on the calculation of next-to-leading order QCD corrections to the production of \( t\overline{t}\) pairs in association with two hard b-jets at the Fermilab TeVatron. Besides the total cross section and its scale dependence, a few differential distributions applicable for Higgs boson searches at the TeVaron are given. The QCD corrections with respect to leading order are negative and small. For our main setup they amount to 2%, and remain reasonably stable against changes of cuts. This proves that an integrated next-to-leading order \(\mathcal{K}\)-factor does not necessarily need to be applied in the background estimation for the \(t\overline{t} H \to t\overline{t} b\overline{b}\) signal process. The distributions show similarly small corrections. The shape of kinematic distributions is distorted at most by about 20% in some corners of the phase space. Even though it is not the main purpose of this paper, we also evaluated the forward-backward asymmetry of the top quark at next-to-leading order.
MSC:
81V22 Unified quantum theories
81V05 Strong interaction, including quantum chromodynamics
81T15 Perturbative methods of renormalization applied to problems in quantum field theory
81U35 Inelastic and multichannel quantum scattering
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[1] Beenakker, W.; etal., Higgs radiation off top quarks at the tevatron and the LHC, Phys. Rev. Lett., 87, 201805, (2001)
[2] Reina, L.; Dawson, S., Next-to-leading order results for \( t\overline t h \) production at the tevatron, Phys. Rev. Lett., 87, 201804, (2001)
[3] Reina, L.; Dawson, S.; Wackeroth, D., QCD corrections to associated \( t\overline t h \) production at the tevatron, Phys. Rev., D 65, 053017, (2002)
[4] Beenakker, W.; etal., NLO QCD corrections to \( t\overline t H \) production in hadron collisions, Nucl. Phys., B 653, 151, (2003)
[5] TEVNPH (TeVatron New Phenomina and Higgs Working Group), CDF and DØ collaboration, Combined CDF and DØ upper limits on standard model Higgs boson production with up to 8.6 fb\^{}{−1}of data, arXiv:1107.5518 [INSPIRE].
[6] DØ collaboration, Search for the standard model Higgs boson in the\( t\overline t H → t\overline t b\overline b \)channel, DØ-NOTE-5739-CONF, Fermilab, Batavia U.S.A. (2009).
[7] CDF collaboration, Search for SM Higgs boson production in association with\( t\overline t \)using no lepton final state, CDF-NOTE-10582, Fermilab, Batavia U.S.A. (2011).
[8] Bevilacqua, G.; Czakon, M.; Papadopoulos, C.; Pittau, R.; Worek, M., Assault on the NLO wishlist: pp → \( t\overline t b\overline b \), JHEP, 09, 109, (2009)
[9] Bevilacqua, G.; Czakon, M.; Papadopoulos, C.; Worek, M., Dominant QCD backgrounds in Higgs boson analyses at the LHC: a study of pp → \( t\overline t \) + 2 jets at next-to-leading order, Phys. Rev. Lett., 104, 162002, (2010)
[10] Bevilacqua, G.; Czakon, M.; Papadopoulos, C.; Worek, M., Hadronic top-quark pair production in association with two jets at next-to-leading order QCD, Phys. Rev., D 84, 114017, (2011)
[11] Bevilacqua, G.; Czakon, M.; Hameren, A.; Papadopoulos, CG; Worek, M., Complete off-shell effects in top quark pair hadroproduction with leptonic decay at next-to-leading order, JHEP, 02, 083, (2011)
[12] Bredenstein, A.; Denner, A.; Dittmaier, S.; Pozzorini, S., NLO QCD corrections to pp → \( t\overline t b\overline b \) + X at the LHC, Phys. Rev. Lett., 103, 012002, (2009)
[13] Bredenstein, A.; Denner, A.; Dittmaier, S.; Pozzorini, S., NLO QCD corrections to top anti-top bottom anti-bottom production at the LHC: 2. full hadronic results, JHEP, 03, 021, (2010)
[14] Denner, A.; Dittmaier, S.; Kallweit, S.; Pozzorini, S., NLO QCD corrections to W W bb production at hadron colliders, Phys. Rev. Lett., 106, 052001, (2011)
[15] Ossola, G.; Papadopoulos, CG; Pittau, R., Reducing full one-loop amplitudes to scalar integrals at the integrand level, Nucl. Phys., B 763, 147, (2007)
[16] G. Bevilacqua et al., HELAC-NLO, arXiv:1110.1499 [INSPIRE].
[17] Ossola, G.; Papadopoulos, CG; Pittau, R., Cuttools: a program implementing the OPP reduction method to compute one-loop amplitudes, JHEP, 03, 042, (2008)
[18] Ossola, G.; Papadopoulos, CG; Pittau, R., On the rational terms of the one-loop amplitudes, JHEP, 05, 004, (2008)
[19] Mastrolia, P.; Ossola, G.; Papadopoulos, C.; Pittau, R., Optimizing the reduction of one-loop amplitudes, JHEP, 06, 030, (2008)
[20] Draggiotis, P.; Garzelli, M.; Papadopoulos, C.; Pittau, R., Feynman rules for the rational part of the QCD 1-loop amplitudes, JHEP, 04, 072, (2009)
[21] Hameren, A.; Papadopoulos, C.; Pittau, R., Automated one-loop calculations: a proof of concept, JHEP, 09, 106, (2009)
[22] Czakon, M.; Papadopoulos, C.; Worek, M., Polarizing the dipoles, JHEP, 08, 085, (2009)
[23] A. van Hameren, Kaleu: a general-purpose parton-level phase space generator, arXiv:1003.4953 [INSPIRE].
[24] Papadopoulos, CG, PHEGAS: a phase space generator for automatic cross-section computation, Comput. Phys. Commun., 137, 247, (2001)
[25] Hameren, A., Oneloop: for the evaluation of one-loop scalar functions, Comput. Phys. Commun., 182, 2427, (2011)
[26] Kanaki, A.; Papadopoulos, CG, HELAC: a package to compute electroweak helicity amplitudes, Comput. Phys. Commun., 132, 306, (2000)
[27] Papadopoulos, CG; Worek, M., Multi-parton cross sections at hadron colliders, Eur. Phys. J., C 50, 843, (2007)
[28] Cafarella, A.; Papadopoulos, CG; Worek, M., Helac-phegas: a generator for all parton level processes, Comput. Phys. Commun., 180, 1941, (2009)
[29] Gleisberg, T.; Krauss, F.; Papadopoulos, C.; Schaelicke, A.; Schumann, S., Cross-sections for multiparticle final states at a linear collider, Eur. Phys. J., C 34, 173, (2004)
[30] Alwall, J.; etal., Comparative study of various algorithms for the merging of parton showers and matrix elements in hadronic collisions, Eur. Phys. J., C 53, 473, (2008)
[31] Englert, C.; Jager, B.; Worek, M.; Zeppenfeld, D., Observing strongly interacting vector boson systems at the CERN large hadron collider, Phys. Rev., D 80, 035027, (2009)
[32] Working Group on Radiative Corrections and Monte Carlo Generators for Low Energies collaboration; Actis, S.; etal., Quest for precision in hadronic cross sections at low energy: Monte Carlo tools vs. experimental data, Eur. Phys. J., C 66, 585, (2010)
[33] Carloni Calame, C.; etal., NNLO leptonic and hadronic corrections to Bhabha scattering and luminosity monitoring at meson factories, JHEP, 07, 126, (2011)
[34] TeVatron Electroweak Working Group, CDF and DØ collaborations, Combination of CDF and DØ results on the mass of the top quark using up to 5\(.\)6 fb\^{}{−1}of data, arXiv:1007.3178 [INSPIRE].
[35] Martin, A.; Stirling, W.; Thorne, R.; Watt, G., Parton distributions for the LHC, Eur. Phys. J., C 63, 189, (2009)
[36] Catani, S.; Dokshitzer, YL; Webber, B., The K\^{}{⊥} perpendicular clustering algorithm for jets in deep inelastic scattering and hadron collisions, Phys. Lett., B 285, 291, (1992)
[37] Catani, S.; Dokshitzer, YL; Seymour, M.; Webber, B., Longitudinally invariant K_{t} clustering algorithms for hadron hadron collisions, Nucl. Phys., B 406, 187, (1993)
[38] Ellis, SD; Soper, DE, Successive combination jet algorithm for hadron collisions, Phys. Rev., D 48, 3160, (1993)
[39] Cacciari, M.; Salam, GP; Soyez, G., The anti-k_{t} jet clustering algorithm, JHEP, 04, 063, (2008)
[40] Dokshitzer, YL; Leder, G.; Moretti, S.; Webber, B., Better jet clustering algorithms, JHEP, 08, 001, (1997)
[41] Nagy, Z.; Trócsányi, Z., Next-to-leading order calculation of four jet observables in electron positron annihilation, Phys. Rev., D 59, 014020, (1999)
[42] Catani, S.; Seymour, M., A general algorithm for calculating jet cross-sections in NLO QCD, Nucl. Phys., B 485, 291, (1997)
[43] Catani, S.; Dittmaier, S.; Seymour, MH; Trócsányi, Z., The dipole formalism for next-to-leading order QCD calculations with massive partons, Nucl. Phys., B 627, 189, (2002)
[44] Dittmaier, S.; Uwer, P.; Weinzierl, S., NLO QCD corrections to \( t\overline t \) + jet production at hadron colliders, Phys. Rev. Lett., 98, 262002, (2007)
[45] Dittmaier, S.; Uwer, P.; Weinzierl, S., Hadronic top-quark pair production in association with a hard jet at next-to-leading order QCD: phenomenological studies for the tevatron and the LHC, Eur. Phys. J., C 59, 625, (2009)
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