Combined effective field theory interpretation of Higgs boson, electroweak vector boson, top quark, and multi-jet measurements

Abstract

Constraints on Wilson coefficients (WCs) corresponding to dimension-six operators of the standard model effective field theory (SMEFT) are determined from a simultaneous fit to seven sets of CMS measurements probing Higgs boson, electroweak vector boson, top quark, and multijet production. Masurements of electroweak precision observables are also included and provide complementary constraints to those from CMS experiment. The CMS measurements, using LHC proton-proton collision data at $\sqrt{s}$ = 13 TeV, corresponding to integrated luminosities of 36.3 or 138 fb$^{-1}$, are chosen to provide sensitivity to a broad set of operators, for which consistent SMEFT predictions can be derived. These are primarily measurements of differential cross sections which are parameterized as functions of the WCs. In measurements targeting $\text{t}(\bar{\text{t}})\text{X}$ production, SMEFT effects are modelled at the detector level. Individual constraints on 64 WCs, and constraints on 43 linear combinations of WCs, are obtained.

Figures (27)

• Figure 1: Example Feynman diagrams of modifications of SM processes by the SMEFT operator $\mathcal{Q}_{\mathrm{W}}$: ${ \mathup{{{W}}{} _{ {}} ^{ {}}} }\xspace{ \mathup{{{\upgamma}}{} _{ {}} ^{ {}}} }\xspace\xspace$ production (left), ${ \mathup{{{W}}{} _{ {}} ^{ {}}} }\xspace{ \mathup{{{W}}{} _{ {}} ^{ {}}} }\xspace\xspace$ production (centre), ${ \mathup{{{H}}{} _{ {}} ^{ {}}} }\xspace\to{ \mathup{{{\upgamma}}{} _{ {}} ^{ {}}} }\xspace{ \mathup{{{\upgamma}}{} _{ {}} ^{ {}}} }\xspace\xspace$ decay (right). The WC $c_{{ \mathup{{{W}}{} _{ {}} ^{ {}}} }\xspace}$ controls the strength of the interaction.
• Figure 2: Relative effect of the linear SMEFT terms for the WCs that affect the Higgs STXS cross sections and the ${ \mathup{{{H}}{} _{ {}} ^{ {}}} }\xspace\to{ \mathup{{{\upgamma}}{} _{ {}} ^{ {}}} }\xspace{ \mathup{{{\upgamma}}{} _{ {}} ^{ {}}} }\xspace$ branching fraction. The parameters $c_j/\Lambda^2$ are set to different values to ensure the effect of all WCs can be visualized on the same $y$ axis scale. The upper panel shows the measured values and their uncertainties relative to the predictions in the SM. As these are measurements of the cross sections times branching fraction, no measurement is displayed in the rightmost bin (labelled "${ \mathup{{{H}}{} _{ {}} ^{ {}}} }\xspace\to{ \mathup{{{\upgamma}}{} _{ {}} ^{ {}}} }\xspace{ \mathup{{{\upgamma}}{} _{ {}} ^{ {}}} }\xspace$").
• Figure 3: Relative effect of the linear SMEFT terms for the WCs that affect the ${ \mathup{{{W}}{} _{ {}} ^{ {}}} }\xspace{ \mathup{{{\upgamma}}{} _{ {}} ^{ {}}} }\xspace\xspace$, ${ \mathup{{{Z}}{} _{ {}} ^{ {}}} }\xspace\to{ \mathup{{{\upnu}}{} _{ {}} ^{ {}}} }\xspace{ \mathup{{{\upnu}}{} _{ {}} ^{ {}}} }\xspace\xspace$, and ${ \mathup{{{W}}{} _{ {}} ^{ {}}} }\xspace{ \mathup{{{W}}{} _{ {}} ^{ {}}} }\xspace\xspace$ differential cross sections. The parameters $c_j/\Lambda^2$ are set to different values to ensure the effect of all WCs can be visualized on the same $y$ axis scale. The upper panel shows the measured values and their uncertainties relative to the predictions in the SM.
• Figure 4: Relative effect of the linear SMEFT terms for the WCs that affect the $\mathup{{{t}}{} _{ {}} ^{ {}}}$$\mathup{{ \overline{ {{ \mathup{{{t}}{} _{ {}} ^{ {}}} }\xspace}}}{} _{ {}} ^{ {}}}$ differential cross sections. The parameters $c_j/\Lambda^2$ are set to different values to ensure the effect of all WCs can be visualized on the same $y$ axis scale. The upper panel shows the measured values and their uncertainties relative to the predictions in the SM.
• Figure 5: Relative effect of the linear SMEFT terms for the WCs that affect the inclusive jet differential cross sections in the rapidity bins $(0, 0.5)$ and $(0.5, 1)$. The parameters $c_j/\Lambda^2$ are set to different values to ensure the effect of all WCs can be visualized on the same $y$ axis scale. The upper panel shows the measured values and their uncertainties relative to the predictions in the SM.