Abstract
In this work we study the phenomenology of the process pp → W +W −jj at the LHC, in the scenario of the resonant vector boson scattering subprocess W +W − → W +W − which we describe within the effective field theory framework of the Electroweak Chiral Lagrangian. We assume a strongly interacting electroweak symmetry breaking sector in which dynamically generated resonances with masses in the TeV scale appear as poles in the Electroweak Chiral Lagrangian amplitudes unitarized with the Inverse Amplitude Method. The relevant resonance here, V0, is the neutral component of the triplet of vector resonances which are known to emerge dynamically at the TeV scale for specific values of the Electroweak Chiral Lagrangian parameters. With the aim of studying the production and possible observation of V 0 at the LHC, via the resonant W +W − → W +W − scatter- ing, a MadGraph 5 UFO model has been developed employing a phenomenological Proca Lagrangian as a practical tool to mimic the correct V 0 properties that are predicted with the Inverse Amplitude Method. We choose to study the fully hadronic decay channel of the final gauge bosons W W → J (jj)J (jj) since it leads to larger event rates and because in the alternative leptonic decay channels the presence of neutrinos complicates the re- construction of the resonance properties. In this context, the 2 boosted jets from the W hadronic decays, jj, are detected as a single fat jet, J , due to their extreme collinearity. We perform a dedicated analysis of the sensitivity to these vector resonances V 0 with masses between 1.5 and 2.5 TeV at the LHC with \( \sqrt{s} \) = 13 TeV and the planned high luminosity of 3000 fb−1, paying special attention to the study of efficient cuts to extract the resonant vector boson fusion signal from the QCD background, which clearly represents the main challenge of this search.
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References
T. Appelquist and C.W. Bernard, Strongly interacting Higgs bosons, Phys. Rev. D 22 (1980) 200 [INSPIRE].
A.C. Longhitano, Heavy Higgs bosons in the Weinberg-Salam model, Phys. Rev. D 22 (1980) 1166 [INSPIRE].
A.C. Longhitano, Low-energy impact of a heavy Higgs boson sector, Nucl. Phys. B 188 (1981) 118 [INSPIRE].
M.S. Chanowitz and M.K. Gaillard, The TeV physics of strongly interacting W’s and Z’s, Nucl. Phys. B 261 (1985) 379 [INSPIRE].
O. Cheyette and M.K. Gaillard, The effective one loop action in the strongly interacting standard electroweak theory, Phys. Lett. B 197 (1987) 205 [INSPIRE].
A. Dobado and M.J. Herrero, Phenomenological Lagrangian approach to the symmetry breaking sector of the standard model, Phys. Lett. B 228 (1989) 495 [INSPIRE].
A. Dobado and M.J. Herrero, Testing the hypothesis of strongly interacting longitudinal weak bosons in electron-positron collisions at TeV energies, Phys. Lett. B 233 (1989) 505 [INSPIRE].
A. Dobado, M.J. Herrero and J. Terron, The role of chiral lagrangians in strongly interacting W (l)W (l) signals at pp supercolliders, Z. Phys. C 50 (1991) 205 [INSPIRE].
A. Dobado, M.J. Herrero and J. Terron, W ± Z 0 signals from the strongly interacting symmetry breaking sector, Z. Phys. C 50 (1991) 465 [INSPIRE].
A. Dobado, D. Espriu and M.J. Herrero, Chiral Lagrangians as a tool to probe the symmetry breaking sector of the SM at LEP, Phys. Lett. B 255 (1991) 405 [INSPIRE].
D. Espriu and M.J. Herrero, Chiral Lagrangians and precision tests of the symmetry breaking sector of the Standard Model, Nucl. Phys. B 373 (1992) 117 [INSPIRE].
F. Feruglio, The chiral approach to the electroweak interactions, Int. J. Mod. Phys. A 8 (1993) 4937 [hep-ph/9301281] [INSPIRE].
A. Dobado et al., Learning about the strongly interacting symmetry breaking sector at LHC, Phys. Lett. B 352 (1995) 400 [hep-ph/9502309] [INSPIRE].
A. Dobado, M.J. Herrero, J.R. Pelaez and E. Ruiz Morales, CERN LHC sensitivity to the resonance spectrum of a minimal strongly interacting electroweak symmetry breaking sector, Phys. Rev. D 62 (2000) 055011 [hep-ph/9912224] [INSPIRE].
R. Alonso et al., The effective chiral lagrangian for a light dynamical “Higgs particle”, Phys. Lett. B 722 (2013) 330 [Erratum ibid. B 726 (2013) 926] [arXiv:1212.3305] [INSPIRE].
G. Buchalla, O. Catà and C. Krause, Complete electroweak chiral lagrangian with a light Higgs at NLO, Nucl. Phys. B 880 (2014) 552 [Erratum ibid. B 913 (2016) 475] [arXiv:1307.5017] [INSPIRE].
D. Espriu and B. Yencho, Longitudinal WW scattering in light of the “Higgs boson” discovery, Phys. Rev. D 87 (2013) 055017 [arXiv:1212.4158] [INSPIRE].
R.L. Delgado, A. Dobado and F.J. Llanes-Estrada, Light ‘Higgs’, yet strong interactions, J. Phys. G 41 (2014) 025002 [arXiv:1308.1629] [INSPIRE].
R.L. Delgado, A. Dobado and F.J. Llanes-Estrada, One-loop WL WL and ZL ZL scattering from the electroweak chiral Lagrangian with a light Higgs-like scalar, JHEP 02 (2014) 121 [arXiv:1311.5993] [INSPIRE].
I. Brivio et al., Disentangling a dynamical Higgs, JHEP 03 (2014) 024 [arXiv:1311.1823] [INSPIRE].
D. Espriu, F. Mescia and B. Yencho, Radiative corrections to WL WL scattering in composite Higgs models, Phys. Rev. D 88 (2013) 055002 [arXiv:1307.2400] [INSPIRE].
D. Espriu and F. Mescia, Unitarity and causality constraints in composite Higgs models, Phys. Rev. D 90 (2014) 015035 [arXiv:1403.7386] [INSPIRE].
R.L. Delgado, A. Dobado, M.J. Herrero and J.J. Sanz-Cillero, One-loop γγ → \( {W}_L^{+}{W}_L^{-} \) and γγ → ZL ZL from the electroweak chiral lagrangian with a light Higgs-like scalar, JHEP 07 (2014) 149 [arXiv:1404.2866] [INSPIRE].
G. Buchalla, O. Catà, A. Celis and C. Krause, Fitting Higgs data with nonlinear effective theory, Eur. Phys. J. C 76 (2016) 233 [arXiv:1511.00988] [INSPIRE].
P. Arnan, D. Espriu and F. Mescia, Interpreting a 2 TeV resonance in WW scattering, Phys. Rev. D 93 (2016) 015020 [arXiv:1508.00174] [INSPIRE].
G. Buchalla et al., Complete one-loop renormalization of the Higgs-electroweak chiral lagrangian, Nucl. Phys. B 928 (2018) 93 [arXiv:1710.06412] [INSPIRE].
J.A. Oller, E. Oset and J.R. Pelaez, Nonperturbative approach to effective chiral Lagrangians and meson interactions, Phys. Rev. Lett. 80 (1998) 3452 [hep-ph/9803242] [INSPIRE].
A. Gomez Nicola and J.R. Pelaez, Meson meson scattering within one loop chiral perturbation theory and its unitarization, Phys. Rev. D 65 (2002) 054009 [hep-ph/0109056] [INSPIRE].
R.L. Delgado et al., Production of vector resonances at the LHC via WZ-scattering: a unitarized EChL analysis, JHEP 11 (2017) 098 [arXiv:1707.04580] [INSPIRE].
C. Garcia-Garcia, M. Herrero and R.A. Morales, Unitarization effects in EFT predictions of WZ scattering at the LHC, arXiv:1907.06668 [INSPIRE].
W.D. Goldberger, B. Grinstein and W. Skiba, Distinguishing the Higgs boson from the dilaton at the Large Hadron Collider, Phys. Rev. Lett. 100 (2008) 111802 [arXiv:0708.1463] [INSPIRE].
J. Fan, W.D. Goldberger, A. Ross and W. Skiba, Standard model couplings and collider signatures of a light scalar, Phys. Rev. D 79 (2009) 035017 [arXiv:0803.2040] [INSPIRE].
L. Vecchi, Phenomenology of a light scalar: the dilaton, Phys. Rev. D 82 (2010) 076009 [arXiv:1002.1721] [INSPIRE].
J. Alwall et al., The automated computation of tree-level and next-to-leading order differential cross sections and their matching to parton shower simulations, JHEP 07 (2014) 079 [arXiv:1405.0301] [INSPIRE].
R. Frederix et al., The automation of next-to-leading order electroweak calculations, JHEP 07 (2018) 185 [arXiv:1804.10017] [INSPIRE].
R. Aoude and W. Shepherd, Jet substructure measurements of interference in non-interfering SMEFT effects, JHEP 08 (2019) 009 [arXiv:1902.11262] [INSPIRE].
T. Sjöstrand, S. Mrenna and P.Z. Skands, PYTHIA 6.4 physics and manual, JHEP 05 (2006) 026 [hep-ph/0603175] [INSPIRE].
DELPHES 3 collaboration, DELPHES 3, a modular framework for fast simulation of a generic collider experiment, JHEP 02 (2014) 057 [arXiv:1307.6346] [INSPIRE].
M. Cacciari, G.P. Salam and G. Soyez, FastJet user manual, Eur. Phys. J. C 72 (2012) 1896 [arXiv:1111.6097] [INSPIRE].
M. Cacciari and G.P. Salam, Dispelling the N 3 myth for the kt jet-finder, Phys. Lett. B 641 (2006) 57 [hep-ph/0512210] [INSPIRE].
M. Cacciari, G.P. Salam and G. Soyez, The anti-kt jet clustering algorithm, JHEP 04 (2008) 063 [arXiv:0802.1189] [INSPIRE].
A. Abdesselam et al., Boosted objects: a probe of beyond the standard model physics, Eur. Phys. J. C 71 (2011) 1661 [arXiv:1012.5412] [INSPIRE].
J. Thaler and K. Van Tilburg, Identifying boosted objects with N-subjettiness, JHEP 03 (2011) 015 [arXiv:1011.2268] [INSPIRE].
J. Thaler and K. Van Tilburg, Maximizing boosted top identification by minimizing N-subjettiness, JHEP 02 (2012) 093 [arXiv:1108.2701] [INSPIRE].
CMS collaboration, Search for massive resonances in dijet systems containing jets tagged as W or Z boson decays in pp collisions at \( \sqrt{s} \) = 8 TeV, JHEP 08 (2014) 173 [arXiv:1405.1994] [INSPIRE].
ATLAS collaboration, Identification of boosted, hadronically decaying Wbosons and comparisons with ATLAS data taken at \( \sqrt{s} \) = 8 TeV, Eur. Phys. J. C 76 (2016) 154 [arXiv:1510.05821] [INSPIRE].
ATLAS collaboration, Search for high-mass diboson resonances with boson-tagged jets in proton-proton collisions at \( \sqrt{s} \) = 8 TeV with the ATLAS detector, JHEP 12 (2015) 055 [arXiv:1506.00962] [INSPIRE].
J.J. Heinrich, Reconstruction of boosted W ± and Z 0 bosons from fat jets, Master’s thesis, Niels Bohr Institute, Copenhagen, Denmark (2014).
ATLAS collaboration, Search for diboson resonances in hadronic final states in 139 fb−1 of pp collisions at \( \sqrt{s} \) = 13 TeV with the ATLAS detector, JHEP 09 (2019) 091 [arXiv:1906.08589] [INSPIRE].
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ArXiv ePrint: 1907.11957
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Delgado, R., Garcia-Garcia, C. & Herrero, M. Dynamical vector resonances from the EChL in VBS at the LHC: the WW case. J. High Energ. Phys. 2019, 65 (2019). https://doi.org/10.1007/JHEP11(2019)065
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DOI: https://doi.org/10.1007/JHEP11(2019)065