Abstract
The study of the Higgs boson’s properties is a cornerstone of the LHC and future collider programs. In this paper, we examine the potential to directly probe the Higgs-top interaction strength and CP-structure in the \( t\overline{t}h \) channel with the Higgs boson decaying to bottom-quark pairs and top-quarks in the di-leptonic mode. We adopt the BDRS algorithm to tag the boosted Higgs and exploit the M2-assisted reconstruction to compute observables sensitive to the CP-phase at the \( t\overline{t} \) rest frame, where the new physics sensitivity can be enhanced. Performing a side-band analysis at the LHC to control the continuum \( t\overline{t}b\overline{b} \) background, we find that the Higgs-top strength and CP-phase can be probed up to \( {\delta}_{\kappa_t} \) ≲ 20% and |α| ≲ 36° at 95% CL, respectively. We also derive that a similar analysis at a 100 TeV future collider could further improve the precision to \( {\delta}_{\kappa_t} \) ≲ 1% and |α| ≲ 1.5°, where the CP-odd observables play a crucial role, boosting the sensitivity on the CP-phase.
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References
A.D. Sakharov, Violation of CP Invariance, C asymmetry, and baryon asymmetry of the universe, Pisma Zh. Eksp. Teor. Fiz. 5 (1967) 32.
W. Buchmüller and D. Wyler, Effective Lagrangian Analysis of New Interactions and Flavor Conservation, Nucl. Phys. B 268 (1986) 621 [INSPIRE].
B. Grzadkowski, M. Iskrzynski, M. Misiak and J. Rosiek, Dimension-Six Terms in the Standard Model Lagrangian, JHEP 10 (2010) 085 [arXiv:1008.4884] [INSPIRE].
M.R. Buckley and D. Goncalves, Boosting the Direct CP Measurement of the Higgs-Top Coupling, Phys. Rev. Lett. 116 (2016) 091801 [arXiv:1507.07926] [INSPIRE].
J. Brod, U. Haisch and J. Zupan, Constraints on CP-violating Higgs couplings to the third generation, JHEP 11 (2013) 180 [arXiv:1310.1385] [INSPIRE].
M.J. Dolan, P. Harris, M. Jankowiak and M. Spannowsky, Constraining CP-violating Higgs Sectors at the LHC using gluon fusion, Phys. Rev. D 90 (2014) 073008 [arXiv:1406.3322] [INSPIRE].
C. Englert, D. Goncalves-Netto, K. Mawatari and T. Plehn, Higgs Quantum Numbers in Weak Boson Fusion, JHEP 01 (2013) 148 [arXiv:1212.0843] [INSPIRE].
F.U. Bernlochner et al., Angles on CP-violation in Higgs boson interactions, Phys. Lett. B 790 (2019) 372 [arXiv:1808.06577] [INSPIRE].
C. Englert, P. Galler, A. Pilkington and M. Spannowsky, Approaching robust EFT limits for CP-violation in the Higgs sector, Phys. Rev. D 99 (2019) 095007 [arXiv:1901.05982] [INSPIRE].
A.V. Gritsan, J. Roskes, U. Sarica, M. Schulze, M. Xiao and Y. Zhou, New features in the JHU generator framework: constraining Higgs boson properties from on-shell and off-shell production, Phys. Rev. D 102 (2020) 056022 [arXiv:2002.09888] [INSPIRE].
H. Bahl et al., Indirect \( \mathcal{CP} \) probes of the Higgs-top-quark interaction: current LHC constraints and future opportunities, JHEP 11 (2020) 127 [arXiv:2007.08542] [INSPIRE].
J. Ellis, D.S. Hwang, K. Sakurai and M. Takeuchi, Disentangling Higgs-Top Couplings in Associated Production, JHEP 04 (2014) 004 [arXiv:1312.5736] [INSPIRE].
F. Boudjema, R.M. Godbole, D. Guadagnoli and K.A. Mohan, Lab-frame observables for probing the top-Higgs interaction, Phys. Rev. D 92 (2015) 015019 [arXiv:1501.03157] [INSPIRE].
M.R. Buckley and D. Goncalves, Constraining the Strength and CP Structure of Dark Production at the LHC: the Associated Top-Pair Channel, Phys. Rev. D 93 (2016) 034003 [arXiv:1511.06451] [INSPIRE].
A.V. Gritsan, R. Röntsch, M. Schulze and M. Xiao, Constraining anomalous Higgs boson couplings to the heavy flavor fermions using matrix element techniques, Phys. Rev. D 94 (2016) 055023 [arXiv:1606.03107] [INSPIRE].
D. Goncalves and D. Lopez-Val, Pseudoscalar searches with dileptonic tops and jet substructure, Phys. Rev. D 94 (2016) 095005 [arXiv:1607.08614] [INSPIRE].
N. Mileo, K. Kiers, A. Szynkman, D. Crane and E. Gegner, Pseudoscalar top-Higgs coupling: exploration of CP-odd observables to resolve the sign ambiguity, JHEP 07 (2016) 056 [arXiv:1603.03632] [INSPIRE].
S. Amor Dos Santos et al., Probing the CP nature of the Higgs coupling in \( t\overline{t}h \) events at the LHC, Phys. Rev. D 96 (2017) 013004 [arXiv:1704.03565] [INSPIRE].
D. Azevedo, A. Onofre, F. Filthaut and R. Gonçalo, CP tests of Higgs couplings in \( t\overline{t}h \) semileptonic events at the LHC, Phys. Rev. D 98 (2018) 033004 [arXiv:1711.05292] [INSPIRE].
J. Li, Z.-g. Si, L. Wu and J. Yue, Central-edge asymmetry as a probe of Higgs-top coupling in \( t\overline{t}h \) production at the LHC, Phys. Lett. B 779 (2018) 72 [arXiv:1701.00224] [INSPIRE].
D. Gonçalves, K. Kong and J.H. Kim, Probing the top-Higgs Yukawa CP structure in dileptonic \( t\overline{t}h \) with M2-assisted reconstruction, JHEP 06 (2018) 079 [arXiv:1804.05874] [INSPIRE].
ATLAS collaboration, Observation of Higgs boson production in association with a top quark pair at the LHC with the ATLAS detector, Phys. Lett. B 784 (2018) 173 [arXiv:1806.00425] [INSPIRE].
CMS collaboration, Observation of \( \mathrm{t}\overline{\mathrm{t}}H \) production, Phys. Rev. Lett. 120 (2018) 231801 [arXiv:1804.02610] [INSPIRE].
B. Bortolato, J. F. Kamenik, N. Košnik and A. Smolkovič, Optimized probes of CP-odd effects in the \( t\overline{t}h \) process at hadron colliders, Nucl. Phys. B 964 (2021) 115328 [arXiv:2006.13110] [INSPIRE].
Q.-H. Cao, K.-P. Xie, H. Zhang and R. Zhang, A New Observable for Measuring CP Property of Top-Higgs Interaction, Chin. Phys. C 45 (2021) 023117 [arXiv:2008.13442] [INSPIRE].
R. Mammen Abraham, D. Gonçalves, T. Han, S.C.I. Leung and H. Qin, Directly probing the Higgs-top coupling at high scales, Phys. Lett. B 825 (2022) 136839 [arXiv:2106.00018] [INSPIRE].
ATLAS collaboration, CP Properties of Higgs Boson Interactions with Top Quarks in the \( t\overline{t}H \) and tH Processes Using H → γγ with the ATLAS Detector, Phys. Rev. Lett. 125 (2020) 061802 [arXiv:2004.04545] [INSPIRE].
CMS collaboration, Measurements of \( \mathrm{t}\overline{\mathrm{t}}H \) Production and the CP Structure of the Yukawa Interaction between the Higgs Boson and Top Quark in the Diphoton Decay Channel, Phys. Rev. Lett. 125 (2020) 061801 [arXiv:2003.10866] [INSPIRE].
M. Cepeda et al., Report from Working Group 2: Higgs Physics at the HL-LHC and HE-LHC, CERN Yellow Rep. Monogr. 7 (2019) 221 [arXiv:1902.00134] [INSPIRE].
ATLAS collaboration, Search for the standard model Higgs boson produced in association with top quarks and decaying into a \( b\overline{b} \) pair in pp collisions at \( \sqrt{s} \) = 13 TeV with the ATLAS detector, Phys. Rev. D 97 (2018) 072016 [arXiv:1712.08895] [INSPIRE].
CMS collaboration, Search for \( \mathrm{t}\overline{\mathrm{t}}\mathrm{H} \) production in the H → \( \mathrm{b}\overline{\mathrm{b}} \) decay channel with leptonic \( \mathrm{t}\overline{\mathrm{t}} \) decays in proton-proton collisions at \( \sqrt{s} \) = 13 TeV, JHEP 03 (2019) 026 [arXiv:1804.03682] [INSPIRE].
M.L. Mangano, T. Plehn, P. Reimitz, T. Schell and H.-S. Shao, Measuring the Top Yukawa Coupling at 100 TeV, J. Phys. G 43 (2016) 035001 [arXiv:1507.08169] [INSPIRE].
W. Bernreuther and Z.-G. Si, Distributions and correlations for top quark pair production and decay at the Tevatron and LHC, Nucl. Phys. B 837 (2010) 90 [arXiv:1003.3926] [INSPIRE].
M. Burns, K. Kong, K.T. Matchev and M. Park, Using Subsystem MT2 for Complete Mass Determinations in Decay Chains with Missing Energy at Hadron Colliders, JHEP 03 (2009) 143 [arXiv:0810.5576] [INSPIRE].
A.J. Barr et al., Guide to transverse projections and mass-constraining variables, Phys. Rev. D 84 (2011) 095031 [arXiv:1105.2977] [INSPIRE].
D. Debnath, D. Kim, J.H. Kim, K. Kong and K.T. Matchev, Resolving Combinatorial Ambiguities in Dilepton \( t\overline{t} \) Event Topologies with Constrained M2 Variables, Phys. Rev. D 96 (2017) 076005 [arXiv:1706.04995] [INSPIRE].
D. Kim, K.T. Matchev, F. Moortgat and L. Pape, Testing Invisible Momentum Ansatze in Missing Energy Events at the LHC, JHEP 08 (2017) 102 [arXiv:1703.06887] [INSPIRE].
C.G. Lester and D.J. Summers, Measuring masses of semiinvisibly decaying particles pair produced at hadron colliders, Phys. Lett. B 463 (1999) 99 [hep-ph/9906349] [INSPIRE].
G.G. Ross and M. Serna, Mass determination of new states at hadron colliders, Phys. Lett. B 665 (2008) 212 [arXiv:0712.0943] [INSPIRE].
W.S. Cho et al., On-shell constrained M2 variables with applications to mass measurements and topology disambiguation, JHEP 08 (2014) 070 [arXiv:1401.1449] [INSPIRE].
P. Baringer, K. Kong, M. McCaskey and D. Noonan, Revisiting Combinatorial Ambiguities at Hadron Colliders with MT2, JHEP 10 (2011) 101 [arXiv:1109.1563] [INSPIRE].
W.S. Cho et al., OPTIMASS: A Package for the Minimization of Kinematic Mass Functions with Constraints, JHEP 01 (2016) 026 [arXiv:1508.00589] [INSPIRE].
FCC collaboration, FCC Physics Opportunities: Future Circular Collider Conceptual Design Report Volume 1, Eur. Phys. J. C 79 (2019) 474 [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].
T. Sjöstrand, S. Mrenna and P.Z. Skands, PYTHIA 6.4 Physics and Manual, JHEP 05 (2006) 026 [hep-ph/0603175] [INSPIRE].
P. Artoisenet, R. Frederix, O. Mattelaer and R. Rietkerk, Automatic spin-entangled decays of heavy resonances in Monte Carlo simulations, JHEP 03 (2013) 015 [arXiv:1212.3460] [INSPIRE].
J.M. Butterworth, A.R. Davison, M. Rubin and G.P. Salam, Jet substructure as a new Higgs search channel at the LHC, Phys. Rev. Lett. 100 (2008) 242001 [arXiv:0802.2470] [INSPIRE].
T. Plehn, G.P. Salam and M. Spannowsky, Fat Jets for a Light Higgs, Phys. Rev. Lett. 104 (2010) 111801 [arXiv:0910.5472] [INSPIRE].
M. Cacciari, G.P. Salam and G. Soyez, FastJet User Manual, Eur. Phys. J. C 72 (2012) 1896 [arXiv:1111.6097] [INSPIRE].
ATLAS collaboration, Technical Design Report for the ATLAS Inner Tracker Pixel Detector, CERN-LHCC-2017-021, ATLAS-TDR-030 (2017).
ATLAS collaboration, Jet mass and substructure of inclusive jets in \( \sqrt{s} \) = 7 TeV pp collisions with the ATLAS experiment, JHEP 05 (2012) 128 [arXiv:1203.4606] [INSPIRE].
F. Demartin, F. Maltoni, K. Mawatari, B. Page and M. Zaro, Higgs characterisation at NLO in QCD: CP properties of the top-quark Yukawa interaction, Eur. Phys. J. C 74 (2014) 3065 [arXiv:1407.5089] [INSPIRE].
F. Demartin, F. Maltoni, K. Mawatari and M. Zaro, Higgs production in association with a single top quark at the LHC, Eur. Phys. J. C 75 (2015) 267 [arXiv:1504.00611] [INSPIRE].
CMS collaboration, Observation of a New Boson at a Mass of 125 GeV with the CMS Experiment at the LHC, Phys. Lett. B 716 (2012) 30 [arXiv:1207.7235] [INSPIRE].
ATLAS collaboration, Measurements of WH and ZH production in the H → \( b\overline{b} \) decay channel in pp collisions at 13 TeV with the ATLAS detector, Eur. Phys. J. C 81 (2021) 178 [arXiv:2007.02873] [INSPIRE].
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Gonçalves, D., Kim, J.H., Kong, K. et al. Direct Higgs-top CP-phase measurement with \( t\overline{t}h \) at the 14 TeV LHC and 100 TeV FCC. J. High Energ. Phys. 2022, 158 (2022). https://doi.org/10.1007/JHEP01(2022)158
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DOI: https://doi.org/10.1007/JHEP01(2022)158