scholarly journals Optimized Probes of the CP Nature of the Top Quark Yukawa Coupling at Hadron Colliders

Symmetry ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1129
Author(s):  
Darius A. Faroughy ◽  
Blaž Bortolato ◽  
Jernej F. Kamenik ◽  
Nejc Košnik ◽  
Aleks Smolkovič

We summarize our recent proposals for probing the CP-odd iκ˜t¯γ5th interaction at the LHC and its projected upgrades directly using associated on-shell Higgs boson and top quark or top quark pair production. We first recount how to construct a CP-odd observable based on top quark polarization in Wb→th scattering with optimal linear sensitivity to κ˜. For the corresponding hadronic process pp→thj we then present a method of extracting the phase-space dependent weight function that allows to retain close to optimal sensitivity to κ˜. For the case of top quark pair production in association with the Higgs boson, pp→tt¯h, with semileptonically decaying tops, we instead show how one can construct manifestly CP-odd observables that rely solely on measuring the momenta of the Higgs boson and the leptons and b-jets from the decaying tops without having to distinguish the charge of the b-jets. Finally, we introduce machine learning (ML) and non-ML techniques to study the phase-space optimization of such CP-odd observables. We emphasize a simple optimized linear combination α·ω that gives similar sensitivity as the studied fully fledged ML models. Using α·ω we review sensitivity projections to κ˜ at HL-LHC, HE-LHC, and FCC-hh.

2016 ◽  
Vol 2016 (10) ◽  
Author(s):  
S. Borowka ◽  
N. Greiner ◽  
G. Heinrich ◽  
S.P. Jones ◽  
M. Kerner ◽  
...  

2014 ◽  
Vol 59 (29-30) ◽  
pp. 3709-3728 ◽  
Author(s):  
Chong-Sheng Li ◽  
Hai-Tao Li ◽  
Ding-Yu Shao

2018 ◽  
Vol 2018 (5) ◽  
Author(s):  
M. Grazzini ◽  
G. Heinrich ◽  
S. Jones ◽  
S. Kallweit ◽  
M. Kerner ◽  
...  

2004 ◽  
Vol 70 (1) ◽  
Author(s):  
Liu Jing-Jing ◽  
Ma Wen-Gan ◽  
Li Gang ◽  
Zhang Ren-You ◽  
Hou Hong-Sheng

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