Optimal determination of New Physics couplings: A comparative study

Abstract

We study the determination of new physics (NP) parameters using the optimal observable technique (OOT) in situations where the standard model (SM) dominates over the NP effects, and when the NP dominates over the SM contribution, using the 2-Higgs doublet model as an illustrative example; for the case of SM domination we extend our results using an effective theory parameterization of NP effects. For the case of SM dominance we concentrate on $t\bar{t}$ production in an $e^{+}{e}^{-}$ collider, while for the case of NP dominance we consider both $t\bar{t}$ production and pair production of charged scalars, also in an $e^{+}{e}^{-}$ collider. We discuss the effects of the efficiency of background reduction, luminosity and beam polarization, and provide a comparison of the optimal uncertainties with those obtained using a standard ${\chi }^2$ analysis of (Monte Carlo generated) collider data.

33 pages, 15 figures, 7 tables; Tilte changed, abstract modified, optimal vs standard ${\chi }^2$ discussed; Accepted for publication in JHEP

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Cited by in corpus (6)

• Probing flavor constrained SMEFT operators through $tc$ production at the Muon collider
• Multi Higgs production via photon fusion at future multi-TeV muon colliders
• Exploring Optimal Sensitivity of Lepton Flavor Violating Effective Couplings at the $e^{+}{e}^{-}$ Colliders
• Optimal sensitivity of anomalous charged triple gauge couplings through $W$ boson helicity at the $e^{+}{e}^{-}$ colliders
• Single-spin measurements and heavy new physics in the $e^{+}{e}^{-}\to t\bar{t}$ process at an FCC-ee
• Optimal New Physics estimation in presence of Standard Model backgrounds