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Measurements are presented of the single-diffractive dijet cross section and the diffractive cross section as a function of the proton fractional momentum loss [Formula omitted] and the four-momentum transfer squared t. Both processes [Formula omitted] and [Formula omitted], i.e. with the proton scattering to either side of the interaction point, are measured, where [Formula omitted] includes at least two jets; the results of the two processes are averaged. The analyses are based on data collected simultaneously with the CMS and TOTEM detectors at the LHC in proton-proton collisions at [Formula omitted] during a dedicated run with [Formula omitted] at low instantaneous luminosity and correspond to an integrated luminosity of [Formula omitted]. The single-diffractive dijet cross section [Formula omitted], in the kinematic region [Formula omitted], [Formula omitted], with at least two jets with transverse momentum [Formula omitted], and pseudorapidity [Formula omitted], is [Formula omitted]. The ratio of the single-diffractive to inclusive dijet yields, normalised per unit of [Formula omitted], is presented as a function of x, the longitudinal momentum fraction of the proton carried by the struck parton. The ratio in the kinematic region defined above, for x values in the range [Formula omitted], is [Formula omitted], where [Formula omitted] and [Formula omitted] are the single-diffractive and inclusive dijet cross sections, respectively. The results are compared with predictions from models of diffractive and nondiffractive interactions. Monte Carlo predictions based on the HERA diffractive parton distribution functions agree well with the data when corrected for the effect of soft rescattering between the spectator partons.

Normalised multi-differential cross sections for top quark pair ( [Formula omitted]) production are measured in proton-proton collisions at a centre-of-mass energy of 13 [Formula omitted] using events containing two oppositely charged leptons. The analysed data were recorded with the CMS detector in 2016 and correspond to an integrated luminosity of [Formula omitted]. The double-differential [Formula omitted] cross section is measured as a function of the kinematic properties of the top quark and of the [Formula omitted] system at parton level in the full phase space. A triple-differential measurement is performed as a function of the invariant mass and rapidity of the [Formula omitted] system and the multiplicity of additional jets at particle level. The data are compared to predictions of Monte Carlo event generators that complement next-to-leading-order (NLO) quantum chromodynamics (QCD) calculations with parton showers. Together with a fixed-order NLO QCD calculation, the triple-differential measurement is used to extract values of the strong coupling strength [Formula omitted] and the top quark pole mass ( [Formula omitted]) using several sets of parton distribution functions (PDFs). The measurement of [Formula omitted] exploits the sensitivity of the [Formula omitted] invariant mass distribution to [Formula omitted] near the production threshold. Furthermore, a simultaneous fit of the PDFs, [Formula omitted], and [Formula omitted] is performed at NLO, demonstrating that the new data have significant impact on the gluon PDF, and at the same time allow an accurate determination of [Formula omitted] and [Formula omitted]. The values [Formula omitted] and [Formula omitted] are extracted, which account for experimental and theoretical uncertainties, the latter being estimated from NLO scale variations. Possible effects from Coulomb and soft-gluon resummation near the [Formula omitted] production threshold are neglected in these parameter extractions. A rough estimate of these effects indicates an expected correction of [Formula omitted] of the order of [Formula omitted], which can be regarded as additional theoretical uncertainty in the current [Formula omitted] extraction.

Events with no charged particles produced between the two leading jets are studied in proton-proton collisions at

A measurement is presented of electroweak (EW) production of a [Formula omitted] boson in association with two jets in proton-proton collisions at [Formula omitted]. The data sample was recorded by the CMS Collaboration at the LHC and corresponds to an integrated luminosity of 35.9 [Formula omitted]. The measurement is performed for the [Formula omitted]jj final state (with [Formula omitted] indicating a lepton-neutrino pair, and j representing the quarks produced in the hard interaction) in a kinematic region defined by invariant mass [Formula omitted] and transverse momenta [Formula omitted]. The cross section of the process is measured in the electron and muon channels yielding [Formula omitted] per channel, in agreement with leading-order standard model predictions. The additional hadronic activity of events in a signal-enriched region is studied, and the measurements are compared with predictions. The final state is also used to perform a search for anomalous trilinear gauge couplings. Limits on anomalous trilinear gauge couplings associated with dimension-six operators are given in the framework of an effective field theory. The corresponding 95% confidence level intervals are [Formula omitted], [Formula omitted], and [Formula omitted]. These results are combined with the CMS EW [Formula omitted] analysis, yielding the constraint on the [Formula omitted] coupling: [Formula omitted].

An analysis of dijet events in PbPb and pp collisions is performed to explore the properties of energy loss by partons traveling in a quark-gluon plasma. Data are collected at a nucleon-nucleon center-of-mass energy of 2.76 TeV at the LHC. The distribution of transverse momentum (p sub(T)) surrounding dijet systems is measured by selecting charged particles in different ranges of p sub(T) and at different angular cones of pseudorapidity and azimuth. The measurement is performed as a function of centrality of the PbPb collisions, the p sub(T) asymmetry of the jets in the dijet pair, and the distance parameter R used in the anti-k sub(T) jet clustering algorithm. In events with unbalanced dijets, PbPb collisions show an enhanced multiplicity in the hemisphere of the subleading jet, with the p sub(T) imbalance compensated by an excess of low-p sub(T) particles at large angles from the jet axes. [Figure not available: see fulltext.]

(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image).A search for a light charged Higgs boson, originating from the decay of a top quark and subsequently decaying into a charm quark and a strange antiquark, is presented. The data used in the analysis correspond to an integrated luminosity of 19.7 fb super(-1) recorded in proton-proton collisions at ... TeV by the CMS experiment at the LHC. The search is performed in the process ..., where the W boson decays to a lepton (electron or muon) and a neutrino. The decays lead to a final state comprising an isolated lepton, at least four jets and large missing transverse energy. No significant deviation is observed in the data with respect to the standard model predictions, and model-independent upper limits are set on the branching fraction ..., ranging from 1.2 to 6.5% for a charged Higgs boson with mass between 90 and 160 GeV, under the assumption that ... [Figure not available: see fulltext.]

A search is presented for an excess of events with heavy-flavor quark pairs ( [Formula omitted] and [Formula omitted]) and a large imbalance in transverse momentum in data from proton-proton collisions at a center-of-mass energy of 13 [Formula omitted]. The data correspond to an integrated luminosity of 2.2 [Formula omitted] collected with the CMS detector at the CERN LHC. No deviations are observed with respect to standard model predictions. The results are used in the first interpretation of dark matter production in [Formula omitted] and [Formula omitted] final states in a simplified model. This analysis is also the first to perform a statistical combination of searches for dark matter produced with different heavy-flavor final states. The combination provides exclusions that are stronger than those achieved with individual heavy-flavor final states.

A measurement is presented of the triple-differential dijet cross section at a centre-of-mass energy of 8 [Formula omitted] using 19.7 [Formula omitted] of data collected with the CMS detector in proton-proton collisions at the LHC. The cross section is measured as a function of the average transverse momentum, half the rapidity separation, and the boost of the two leading jets in the event. The cross section is corrected for detector effects and compared to calculations in perturbative quantum chromodynamics at next-to-leading order accuracy, complemented with electroweak and nonperturbative corrections. New constraints on parton distribution functions are obtained and the inferred value of the strong coupling constant is [Formula omitted], where [Formula omitted] is the mass of the Z boson.

Measurements of the associated production of a [Formula omitted] boson with at least one jet originating from a b quark in proton-proton collisions at [Formula omitted] are presented. Differential cross sections are measured with data collected by the CMS experiment corresponding to an integrated luminosity of 19.8 [Formula omitted]. [Formula omitted] bosons are reconstructed through their decays to electrons and muons. Cross sections are measured as a function of observables characterizing the kinematics of the [Formula omitted] jet and the [Formula omitted] boson. Ratios of differential cross sections for the associated production with at least one [Formula omitted] jet to the associated production with any jet are also presented. The production of a [Formula omitted] boson with at least two [Formula omitted] jets is investigated, and differential cross sections are measured for the dijet system. Results are compared to theoretical predictions, testing two different flavour schemes for the choice of initial-state partons.

A search for new phenomena is performed using events with jets and significant transverse momentum imbalance, as inferred through the [Formula omitted] variable. The results are based on a sample of proton-proton collisions collected in 2016 at a center-of-mass energy of 13 [Formula omitted] with the CMS detector and corresponding to an integrated luminosity of 35.9 [Formula omitted]. No excess event yield is observed above the predicted standard model background, and the results are interpreted as exclusion limits at 95% confidence level on the masses of predicted particles in a variety of simplified models of R-parity conserving supersymmetry. Depending on the details of the model, 95% confidence level lower limits on the gluino (light-flavor squark) masses are placed up to 2025 (1550) [Formula omitted]. Mass limits as high as 1070 (1175) [Formula omitted] are set on the masses of top (bottom) squarks. Information is provided to enable re-interpretation of these results, including model-independent limits on the number of non-standard model events for a set of simplified, inclusive search regions.