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A study of the anomalous couplings of the Higgs boson to vector bosons, including [Formula omitted]-violation effects, has been conducted using its production and decay in the WW channel. This analysis is performed on proton-proton collision data collected with the CMS detector at the CERN LHC during 2016-2018 at a center-of-mass energy of 13 TeV, and corresponds to an integrated luminosity of 138 [Formula omitted]. The different-flavor dilepton [Formula omitted] final state is analyzed, with dedicated categories targeting gluon fusion, electroweak vector boson fusion, and associated production with a W or Z boson. Kinematic information from associated jets is combined using matrix element techniques to increase the sensitivity to anomalous effects at the production vertex. A simultaneous measurement of four Higgs boson couplings to electroweak vector bosons is performed in the framework of a standard model effective field theory. All measurements are consistent with the expectations for the standard model Higgs boson and constraints are set on the fractional contribution of the anomalous couplings to the Higgs boson production cross section.

A measurement is presented of a ratio observable that provides a measure of the azimuthal correlations among jets with large transverse momentum [Formula omitted]. This observable is measured in multijet events over the range of [Formula omitted]- [Formula omitted] based on data collected by the CMS experiment in proton-proton collisions at a centre-of-mass energy of 13 [Formula omitted], corresponding to an integrated luminosity of 134 [Formula omitted]. The results are compared with predictions from Monte Carlo parton-shower event generator simulations, as well as with fixed-order perturbative quantum chromodynamics (pQCD) predictions at next-to-leading-order (NLO) accuracy obtained with different parton distribution functions (PDFs) and corrected for nonperturbative and electroweak effects. Data and theory agree within uncertainties. From the comparison of the measured observable with the pQCD prediction obtained with the NNPDF3.1 NLO PDFs, the strong coupling at the Z boson mass scale is [Formula omitted], where the total uncertainty is dominated by the scale dependence of the fixed-order predictions. A test of the running of [Formula omitted] in the [Formula omitted] region shows no deviation from the expected NLO pQCD behaviour.

A search for [Formula omitted] and [Formula omitted] production in the [Formula omitted] final state is presented, where H is the standard model (SM) Higgs boson. The search uses an event sample of proton-proton collisions corresponding to an integrated luminosity of 133 [Formula omitted] collected at a center-of-mass energy of 13 [Formula omitted] with the CMS detector at the CERN LHC. The analysis introduces several novel techniques for deriving and validating a multi-dimensional background model based on control samples in data. A multiclass multivariate classifier customized for the [Formula omitted] final state is developed to derive the background model and extract the signal. The data are found to be consistent, within uncertainties, with the SM predictions. The observed (expected) upper limits at 95% confidence level are found to be 3.8 (3.8) and 5.0 (2.9) times the SM prediction for the [Formula omitted] and [Formula omitted] production cross sections, respectively.

A search for exotic decays of the Higgs boson ( [Formula omitted]) with a mass of 125 [Formula omitted] to a pair of light pseudoscalars [Formula omitted] is performed in final states where one pseudoscalar decays to two [Formula omitted] quarks and the other to a pair of muons or [Formula omitted] leptons. A data sample of proton-proton collisions at [Formula omitted] corresponding to an integrated luminosity of 138 [Formula omitted] recorded with the CMS detector is analyzed. No statistically significant excess is observed over the standard model backgrounds. Upper limits are set at 95% confidence level ( [Formula omitted]) on the Higgs boson branching fraction to [Formula omitted] and to [Formula omitted] via a pair of [Formula omitted]s. The limits depend on the pseudoscalar mass [Formula omitted] and are observed to be in the range (0.17-3.3) [Formula omitted] and (1.7-7.7) [Formula omitted] in the [Formula omitted] and [Formula omitted] final states, respectively. In the framework of models with two Higgs doublets and a complex scalar singlet (2HDM+S), the results of the two final states are combined to determine upper limits on the branching fraction [Formula omitted] at 95% [Formula omitted], with [Formula omitted] being a muon or a [Formula omitted] lepton. For different types of 2HDM+S, upper bounds on the branching fraction [Formula omitted] are extracted from the combination of the two channels. In most of the Type II 2HDM+S parameter space, [Formula omitted] values above 0.23 are excluded at 95% [Formula omitted] for [Formula omitted] values between 15 and 60 [Formula omitted].

The strange quark content of the proton is probed through the measurement of the production cross section for a W boson and a charm (c) quark in proton-proton collisions at a center-of-mass energy of 13 [Formula omitted]. The analysis uses a data sample corresponding to a total integrated luminosity of 138 [Formula omitted] collected with the CMS detector at the LHC. The W bosons are identified through their leptonic decays to an electron or a muon, and a neutrino. Charm jets are tagged using the presence of a muon or a secondary vertex inside the jet. The [Formula omitted] production cross section and the cross section ratio [Formula omitted] are measured inclusively and differentially as functions of the transverse momentum and the pseudorapidity of the lepton originating from the W boson decay. The precision of the measurements is improved with respect to previous studies, reaching 1% in [Formula omitted]. The measurements are compared with theoretical predictions up to next-to-next-to-leading order in perturbative quantum chromodynamics.

A search for decays to invisible particles of Higgs bosons produced in association with a top-antitop quark pair or a vector boson, which both decay to a fully hadronic final state, has been performed using proton-proton collision data collected at [Formula omitted] by the CMS experiment at the LHC, corresponding to an integrated luminosity of 138 [Formula omitted]. The 95% confidence level upper limit set on the branching fraction of the 125 [Formula omitted] Higgs boson to invisible particles, [Formula omitted], is 0.54 (0.39 expected), assuming standard model production cross sections. The results of this analysis are combined with previous [Formula omitted] searches carried out at [Formula omitted], 8, and 13 [Formula omitted] in complementary production modes. The combined upper limit at 95% confidence level on [Formula omitted] is 0.15 (0.08 expected).

The mass of the top quark is measured in 36.3 [Formula omitted] of LHC proton-proton collision data collected with the CMS detector at [Formula omitted]. The measurement uses a sample of top quark pair candidate events containing one isolated electron or muon and at least four jets in the final state. For each event, the mass is reconstructed from a kinematic fit of the decay products to a top quark pair hypothesis. A profile likelihood method is applied using up to four observables per event to extract the top quark mass. The top quark mass is measured to be [Formula omitted]. This approach significantly improves the precision over previous measurements.

The production of Z bosons associated with jets is measured in [Formula omitted] collisions at [Formula omitted] with data recorded with the CMS experiment at the LHC corresponding to an integrated luminosity of 36.3 [Formula omitted]. The multiplicity of jets with transverse momentum [Formula omitted] is measured for different regions of the Z boson's [Formula omitted], from lower than 10 [Formula omitted] to higher than 100 [Formula omitted]. The azimuthal correlation [Formula omitted] between the Z boson and the leading jet, as well as the correlations between the two leading jets are measured in three regions of [Formula omitted]. The measurements are compared with several predictions at leading and next-to-leading orders, interfaced with parton showers. Predictions based on transverse-momentum dependent parton distributions and corresponding parton showers give a good description of the measurement in the regions where multiple parton interactions and higher jet multiplicities are not important. The effects of multiple parton interactions are shown to be important to correctly describe the measured spectra in the low [Formula omitted] regions.

Multijet events at large transverse momentum ( [Formula omitted]) are measured at [Formula omitted] using data recorded with the CMS detector at the LHC, corresponding to an integrated luminosity of [Formula omitted]. The multiplicity of jets with [Formula omitted] that are produced in association with a high- [Formula omitted] dijet system is measured in various ranges of the [Formula omitted] of the jet with the highest transverse momentum and as a function of the azimuthal angle difference [Formula omitted] between the two highest [Formula omitted] jets in the dijet system. The differential production cross sections are measured as a function of the transverse momenta of the four highest [Formula omitted] jets. The measurements are compared with leading and next-to-leading order matrix element calculations supplemented with simulations of parton shower, hadronization, and multiparton interactions. In addition, the measurements are compared with next-to-leading order matrix element calculations combined with transverse-momentum dependent parton densities and transverse-momentum dependent parton shower.

The double differential cross sections of the Drell-Yan lepton pair ( [Formula omitted], dielectron or dimuon) production are measured as functions of the invariant mass [Formula omitted], transverse momentum [Formula omitted], and [Formula omitted]. The [Formula omitted] observable, derived from angular measurements of the leptons and highly correlated with [Formula omitted], is used to probe the low- [Formula omitted] region in a complementary way. Dilepton masses up to 1 [Formula omitted] are investigated. Additionally, a measurement is performed requiring at least one jet in the final state. To benefit from partial cancellation of the systematic uncertainty, the ratios of the differential cross sections for various [Formula omitted] ranges to those in the Z mass peak interval are presented. The collected data correspond to an integrated luminosity of 36.3 [Formula omitted] of proton-proton collisions recorded with the CMS detector at the LHC at a centre-of-mass energy of 13 [Formula omitted]. Measurements are compared with predictions based on perturbative quantum chromodynamics, including soft-gluon resummation.