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169 papers found.
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Search for a heavy pseudoscalar boson decaying to a Z and a Higgs boson at \(\sqrt{s}=13\,\text {Te}\text {V} \)

A search is presented for a heavy pseudoscalar boson \(\text {A}\) decaying to a Z  boson and a Higgs boson with mass of 125\(\,\text {GeV}\). In the final state considered, the Higgs boson decays to a bottom quark and antiquark, and the Z  boson decays either into a pair of electrons, muons, or neutrinos. The analysis is performed using a data sample corresponding to an...

Measurement of the energy density as a function of pseudorapidity in proton–proton collisions at \(\sqrt{s} =13\,\text {TeV} \)

A measurement of the energy density in proton–proton collisions at a centre-of-mass energy of \(\sqrt{s} =13\) \(\,\text {TeV}\) is presented. The data have been recorded with the CMS experiment at the LHC during low luminosity operations in 2015. The energy density is studied as a function of pseudorapidity in the ranges \(-\,6.6<\eta <-\,5.2\) and \(3.15<|\eta |<5.20\). The...

Measurement of the \({\mathrm {t}\overline{\mathrm {t}}}\) production cross section, the top quark mass, and the strong coupling constant using dilepton events in pp collisions at \(\sqrt{s}=13\,\text {Te}\text {V} \)

A measurement of the top quark–antiquark pair production cross section \(\sigma _{\mathrm {t}\overline{\mathrm {t}}} \) in proton–proton collisions at a centre-of-mass energy of 13\(\,\text {Te}\text {V}\) is presented. The data correspond to an integrated luminosity of \(35.9{\,\text {fb}^{-1}} \), recorded by the CMS experiment at the CERN LHC in 2016. Dilepton events...

Search for contact interactions and large extra dimensions in the dilepton mass spectra from proton-proton collisions at \( \sqrt{s}=13 \) TeV

Abstract A search for nonresonant excesses in the invariant mass spectra of electron and muon pairs is presented. The analysis is based on data from proton-proton collisions at a center-of-mass energy of 13 TeV recorded by the CMS experiment in 2016, corresponding to a total integrated luminosity of 36 fb−1. No significant deviation from the standard model is observed. Limits are...

Measurement of the top quark mass in the all-jets final state at \(\sqrt{s}=13\,\text {TeV} \) and combination with the lepton+jets channel

A top quark mass measurement is performed using \(35.9{\,\text {fb}^{-1}} \) of LHC proton–proton collision data collected with the CMS detector at \(\sqrt{s}=13\,\text {TeV} \). The measurement uses the \({\mathrm {t}\overline{\mathrm {t}}}\) all-jets final state. A kinematic fit is performed to reconstruct the decay of the \({\mathrm {t}\overline{\mathrm {t}}}\)  system and...

Search for resonant production of second-generation sleptons with same-sign dimuon events in proton–proton collisions at \(\sqrt{s} = 13\,\text {TeV} \)

A search is presented for resonant production of second-generation sleptons (\(\widetilde{\mu } _{\mathrm {L}}\), \(\widetilde{\nu }_{\mu }\)) via the R-parity-violating coupling \({\lambda ^{\prime }_{211}}\) to quarks, in events with two same-sign muons and at least two jets in the final state. The smuon (muon sneutrino) is expected to decay into a muon and a neutralino...

Search for resonant \( \mathrm{t}\overline{\mathrm{t}} \) production in proton-proton collisions at \( \sqrt{s}=13 \) TeV

Abstract A search for a heavy resonance decaying into a top quark and antiquark \( \left(\mathrm{t}\overline{\mathrm{t}}\right) \) pair is performed using proton-proton collisions at \( \sqrt{s}=13 \) TeV. The search uses the data set collected with the CMS detector in 2016, which corresponds to an integrated luminosity of 35.9 fb−1. The analysis considers three exclusive final...

Measurement of exclusive \(\mathrm {\Upsilon }\) photoproduction from protons in \(\mathrm {p}\) Pb collisions at \(\sqrt{\smash [b]{s_{_{\mathrm {NN}}}}} = 5.02\,\text {TeV} \)

The exclusive photoproduction of \(\mathrm {\Upsilon }\mathrm {(nS)} \) meson states from protons, \(\gamma \mathrm {p} \rightarrow \mathrm {\Upsilon }\mathrm {(nS)} \,\mathrm {p}\) (with \(\mathrm {n}=1,2,3\)), is studied in ultraperipheral \(\mathrm {p}\)Pb collisions at a centre-of-mass energy per nucleon pair of \(\sqrt{\smash [b]{s_{_{\mathrm {NN}}}}} = 5.02\,\text {TeV...

Search for dark matter produced in association with a single top quark or a top quark pair in proton-proton collisions at \( \sqrt{s}=13 \) TeV

Abstract A search for dark matter produced in association with top quarks in proton-proton collisions at a center-of-mass energy of 13 TeV is presented. The data set used corresponds to an integrated luminosity of 35.9 fb−1 recorded with the CMS detector at the LHC. Whereas previous searches for neutral scalar or pseudoscalar mediators considered dark matter production in...

Measurement of associated production of a \(\mathrm {W}\) boson and a charm quark in proton–proton collisions at \(\sqrt{s} = 13\,\text {Te}\text {V} \)

Measurements are presented of associated production of a \(\mathrm {W}\) boson and a charm quark (\(\mathrm {W}+\mathrm {c}\)) in proton–proton collisions at a center-of-mass energy of 13\(\,\text {Te}\text {V}\). The data correspond to an integrated luminosity of 35.7\(\,\text {fb}^{-1}\) collected by the CMS experiment at the CERN LHC. The \(\mathrm {W}\) bosons are identified...

Search for a W′ boson decaying to a vector-like quark and a top or bottom quark in the all-jets final state

Abstract A search for a heavy W′ resonance decaying to one B or T vector-like quark and a top or bottom quark, respectively, is presented. The search uses proton-proton collision data collected in 2016 with the CMS detector at the LHC, corresponding to an integrated luminosity of 35.9 fb−1 at \( \sqrt{s}=13 \) TeV. Both decay channels result in a final state with a top quark, a...

Search for the pair production of light top squarks in the e±μ∓ final state in proton-proton collisions at \( \sqrt{s}=13 \) TeV

Abstract A search for the production of a pair of top squarks at the LHC is presented. This search targets a region of parameter space where the kinematics of top squark pair production and top quark pair production are very similar, because of the mass difference between the top squark and the neutralino being close to the top quark mass. The search is performed with 35.9 fb−1...

Search for top quark partners with charge 5/3 in the same-sign dilepton and single-lepton final states in proton-proton collisions at \( \sqrt{s}=13 \) TeV

Abstract A search for the pair production of heavy fermionic partners of the top quark with charge 5/3 (X5/3) is performed in proton-proton collisions at a center-of-mass energy of 13 TeV with the CMS detector at the CERN LHC. The data sample analyzed corresponds to an integrated luminosity of 35.9 fb−1. The X5/3 quark is assumed always to decay into a top quark and a W boson...

Search for a heavy resonance decaying to a top quark and a vector-like top quark in the lepton + jets final state in pp collisions at \(\sqrt{s} = 13\,\text {TeV} \)

A search is presented for a heavy spin-1 resonance \(\mathrm {Z}'\) decaying to a top quark and a vector-like top quark partner \(\text {T} \) in the lepton + jets final state. The search is performed using a data set of \(\mathrm {p}\) \(\mathrm {p}\) collisions at a centre-of-mass energy of 13\(\,\text {TeV}\) corresponding to an integrated luminosity of \(35.9{\,\text {fb}^{-1...

Inclusive search for supersymmetry in pp collisions at \( \sqrt{s}=13 \) TeV using razor variables and boosted object identification in zero and one lepton final states

Abstract An inclusive search for supersymmetry (SUSY) using the razor variables is performed using a data sample of proton-proton collisions corresponding to an integrated luminosity of 35.9 fb−1, collected with the CMS experiment in 2016 at a center-of-mass energy of \( \sqrt{s}=13 \) TeV. The search looks for an excess of events with large transverse energy, large jet...

Search for \( \mathrm{t}\overline{\mathrm{t}}\mathrm{H} \) production in the \( \mathrm{H}\to \mathrm{b}\overline{\mathrm{b}} \) decay channel with leptonic \( \mathrm{t}\overline{\mathrm{t}} \) decays in proton-proton collisions at \( \sqrt{s}=13 \) TeV

Abstract A search is presented for the associated production of a standard model Higgs boson with a top quark-antiquark pair (\( \mathrm{t}\overline{\mathrm{t}}\mathrm{H} \)), in which the Higgs boson decays into a b quark-antiquark pair, in proton-proton collisions at a centre-of-mass energy \( \sqrt{s}=13 \) TeV. The data correspond to an integrated luminosity of 35.9 fb−1...

Measurements of \( \mathrm{t}\overline{\mathrm{t}} \) differential cross sections in proton-proton collisions at \( \sqrt{\mathrm{s}}=13 \) TeV using events containing two leptons

Abstract Measurements of differential top quark pair \( \mathrm{t}\overline{\mathrm{t}} \) cross sections using events produced in proton-proton collisions at a centre-of-mass energy of 13 TeV containing two oppositely charged leptons are presented. The data were recorded by the CMS experiment at the CERN LHC in 2016 and correspond to an integrated luminosity of 35.9 fb−1. The...

Search for new physics in final states with a single photon and missing transverse momentum in proton-proton collisions at \( \sqrt{s}=13 \) TeV

Abstract A search is conducted for new physics in final states containing a photon and missing transverse momentum in proton-proton collisions at \( \sqrt{s}=13 \) TeV, using the data collected in 2016 by the CMS experiment at the LHC, corresponding to an integrated luminosity of 35.9 fb−1. No deviations from the predictions of the standard model are observed. The results are...

Study of the underlying event in top quark pair production in \(\mathrm {p}\mathrm {p}\) collisions at 13 \(~\text {Te}\text {V}\)

Measurements of normalized differential cross sections as functions of the multiplicity and kinematic variables of charged-particle tracks from the underlying event in top quark and antiquark pair production are presented. The measurements are performed in proton-proton collisions at a center-of-mass energy of 13\(~\text {Te}\text {V}\), and are based on data collected by the CMS...