Probing the top-Higgs Yukawa CP structure in dileptonic $$ t\overline{t}h $$ with M2-assisted reconstruction

Gonçalves, Dorival; Kim, Jeong Han; Kong, Kyoungchul

doi:10.1007/jhep06(2018)079

Cited by 48 publications

(45 citation statements)

References 81 publications

(114 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Additional complex phases in the SM Yukawa sector would be another source of CP-violation, e.g. in the tth interaction [28][29][30][31]. Any kinematic effect from this interaction would be degenerate with O HG in gluon-fusion production as long as the m t threshold is not resolved kinematically, which does not happen for our choice of measurements.…”

Section: Theoretical Frameworkmentioning

confidence: 99%

“…This is not the case for terms proportional to 1/Λ 4 , which contain the squared dimension-6 amplitude and produce a CP-even effect regardless of the nature of the operator. This has historically served as a motivation to constrain CP-odd operators with momentumdependent observables in a range of production modes [25,29,31,[38][39][40][41][42][43][44][45]. However, such an approach is more model-dependent since it neglects dimension-8 operators that interfere with the SM and in general produce similar O(1/Λ 4 ) effects.…”

Section: Theoretical Frameworkmentioning

confidence: 99%

“…Furthermore, model-independent ∆φ jj measurements in the h → W W * → ν ν and h → τ τ decay channels, as well as differential cross sections as a function of the decay angles in h → W W * → ν ν decay would add further constraints. Finally, model-independent differential mea- surements of other processes will be possible by the end of Run-3 and/or HL-LHC, with CP-sensitive differential information expected for Higgs boson production in association with a weak boson [88] or a top-antitop quark pair [30,31]. The measurements of Higgs boson production in association with a weak boson would add additional information that could constrain the O HW , O HB and O HW B operators.…”

Section: Enhancing the Sensitivity To Cp-violation In The Higgs Sementioning

confidence: 99%

See 2 more Smart Citations

Angles on CP-violation in Higgs boson interactions

et al. 2019

View full text Add to dashboard Cite

CP-violation in the Higgs sector remains a possible source of the baryon asymmetry of the universe. Recent differential measurements of signed angular distributions in Higgs boson production provide a general experimental probe of the CP structure of Higgs boson interactions. We interpret these measurements using the Standard Model Effective Field Theory and show that they do not distinguish the various CP-violating operators that couple the Higgs and gauge fields. However, the constraints can be sharpened by measuring additional CP-sensitive observables and exploiting phase-space-dependent effects. Using these observables, we demonstrate that perturbatively meaningful constraints on CP-violating operators can be obtained at the LHC with luminosities of O(100/fb). Our results provide a roadmap to a global Higgs boson coupling analysis that includes CP-violating effects.

show abstract

Section: Theoretical Frameworkmentioning

confidence: 99%

Section: Theoretical Frameworkmentioning

confidence: 99%

Section: Enhancing the Sensitivity To Cp-violation In The Higgs Sementioning

confidence: 99%

See 1 more Smart Citation

Angles on CP-violation in Higgs boson interactions

et al. 2019

View full text Add to dashboard Cite

show abstract

“…where φ ,1 (φ ,2 ) is the azimuthal angle of the first (second) charged lepton [28]. The leptons are ordered according to their rapidity, i.e.…”

Section: B Observablesmentioning

confidence: 99%

“…An analogous observable can be constructed for top quarkassociated Higgs production as well, as discussed in detail recently in Ref. [27,28]. Working in the dimension six linearised approximation, such observables are the only phenomenologically viable ones because the interference terms cancel identically for any CP-even observable, such as total cross sections, decay widths as well as momentum transfer-dependent observables such as transverse momenta and invariant masses.…”

Section: Introductionmentioning

confidence: 99%

Approaching robust EFT limits for CP violation in the Higgs sector

et al. 2019

View full text Add to dashboard Cite

Constraining CP-violating interactions in effective field theory (EFT) of dimension six faces two challenges. Firstly, degeneracies in the multi-dimensional space of Wilson coefficients have to be lifted. Secondly, quadratic contributions of CP-odd dimension six operators are difficult to disentangle from squared contributions of CP-even dimension six operators and from linear contributions of dimension eight operators. Both of these problems are present when new sources of CP-violation are present in the interactions between the Higgs boson and heavy strongly-interacting fermions. We show that degeneracies in the Wilson coefficients can be removed by combining measurements of Higgs-plus-two-jet production via gluon fusion with measurements of top-pair associated Higgs production. In addition, we demonstrate that the sensitivity of the analysis can be improved by exploiting the top-quark threshold in the gluon fusion process. Finally, we substantiate a perturbative argument about the validity of EFT by comparing the quadratic and linear contributions from CP-odd dimension six operators and use this to show explicitly that high statistics measurements at future colliders enable the extraction of perturbatively robust constraints on the associated Wilson coefficients.

show abstract

Direct Higgs-top CP-phase measurement with $$ t\overline{t}h $$ at the 14 TeV LHC and 100 TeV FCC

Gonçalves

Kim

Kong

et al. 2022

J. High Energ. Phys.

Self Cite

View full text Add to dashboard Cite

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 $$ t\overline{t}h $$ t 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 $$ t\overline{t} $$ t t ¯ rest frame, where the new physics sensitivity can be enhanced. Performing a side-band analysis at the LHC to control the continuum $$ t\overline{t}b\overline{b} $$ t t ¯ b b ¯ background, we find that the Higgs-top strength and CP-phase can be probed up to $$ {\delta}_{\kappa_t} $$ δ κ 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 $$ {\delta}_{\kappa_t} $$ δ κ t ≲ 1% and |α| ≲ 1.5°, where the CP-odd observables play a crucial role, boosting the sensitivity on the CP-phase.

show abstract

Probing the top-Higgs Yukawa CP structure in dileptonic $$ t\overline{t}h $$ with M2-assisted reconstruction

Cited by 48 publications

References 81 publications

Angles on CP-violation in Higgs boson interactions

Angles on CP-violation in Higgs boson interactions

Approaching robust EFT limits for CP violation in the Higgs sector

Direct Higgs-top CP-phase measurement with $$ t\overline{t}h $$ at the 14 TeV LHC and 100 TeV FCC

Contact Info

Product

Resources

About