Constraining the SMEFT with a differential cross section measurement of $tWZ$ production at the HL-LHC

Abstract

A prospective measurement of the differential cross section of \tWZ production with respect to the transverse momentum of the \PZ boson using a general-purpose detector at the High-Luminosity Large Hadron Collider (HL-LHC) is described. The response of a general-purpose detector at the HL-LHC is simulated and used to estimate the uncertainties and covariances of the differential cross section measurement. Constraints on the Standard Model Effective Field Theory (SMEFT) enabled by the measurement are estimated. A parametric model of the differential cross section in the SMEFT is constructed and is used to determine the expected posterior probability function of six SMEFT Wilson coefficients and the expected 95\% Bayesian credible intervals for each coefficient and pair of coefficients. The intervals suggest that for all coefficients, the measurement will provide competitive but weaker constraints than those derived from other \mbox{HL-LHC} measurements involving top quarks and \PZ bosons. However, as the measurement is simultaneously sensitive to to a unique set of SMEFT coefficients, it will provide a useful input to a global SMEFT analysis that considers many operators.

9 pages, 3 figures

References in corpus (9)

• A Monte Carlo global analysis of the Standard Model Effective Field Theory: the top quark sector
• Why should we care about the top quark Yukawa coupling?
• Interpolation between multi-dimensional histograms using a new non-linear moment morphing method
• The top quark electro-weak couplings after LHC Run 2
• Single top production in association with a $WZ$ pair at the LHC in the SMEFT
• Inclusive and differential cross section measurements of single top quark production in association with a Z boson in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Modelling Wt and tWZ production at NLO for ATLAS analyses
• Signs of new physics in top quark pair production associated with a neutrino pair at the LHC
• Top quark electroweak interactions

Cited by in corpus (3)

• Dispelling the $\sqrt{L}$ myth for the High-Luminosity LHC
• Evidence for tWZ production in proton-proton collisions at $\sqrt{s}$ = 13 TeV in multilepton final states
• Observation of tWZ production at the CMS experiment