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Search for new long-lived particles at √ s =13 TeV
(2018)Physics Letters BThe observation of physics beyond the standard model (BSM) is one of the main objectives of the ATLAS and CMS experiments at the CERN LHC. With no signal yet observed, these experiments have placed stringent bounds on BSM models. The majority of these searches focus on particles with lab frame decay lengths of mm and incorporate selection requirements that reject longer-lived particle decays. This leaves open the possibility that long-lived ...Journal Article -
Study of dijet events with a large rapidity gap between the two leading jets in pp collisions at √s=7TeV
(2018)The European Physical Journal CEvents with no charged particles produced between the two leading jets are studied in proton-proton collisions at s√=7 TeV. The jets were required to have transverse momentum pjetT>40 GeV and pseudorapidity 1.5<|ηjet|<4.7, and to have values of ηjet with opposite signs. The data used for this study were collected with the CMS detector during low-luminosity running at the LHC, and correspond to an integrated luminosity of 8pb−1. Events ...Journal Article -
Search for single production of a vector-like T quark decaying to a Z boson and a top quark in proton-proton collisions at s = 13 TeV
(2018)Physics letters BA search is presented for single production of a vector-like quark (T) decaying to a Z boson and a top quark, with the Z boson decaying leptonically and the top quark decaying hadronically. The search uses data collected by the CMS experiment in proton–proton collisions at a center-of-mass energy of 13 TeV in 2016, corresponding to an integrated luminosity of 35.9 fb-1. The presence of forward jets is a particular characteristic of single ...Journal Article -
Measurement of the Splitting Function in pp and Pb-Pb Collisions at √sNN=5.02 TeV
(2018)Physical Review LettersData from heavy ion collisions suggest that the evolution of a parton shower is modified by interactions with the color charges in the dense partonic medium created in these collisions, but it is not known where in the shower evolution the modifications occur. The momentum ratio of the two leading partons, resolved as subjets, provides information about the parton shower evolution. This substructure observable, known as the splitting ...Journal Article -
Measurement of the associated production of a single top quark and a Z boson in pp collisions at, root s=13 TeV
(2018)Physics Letters BA measurement is presented of the associated production of a single top quark and a Z boson. The study uses data from proton-proton collisions at, root s = 13 TeV recorded by the CMS experiment, corresponding to an integrated luminosity of 35.9 fb(-1). Using final states with three leptons (electrons or muons), the tZq production cross section is measured to be sigma (pp -> tZq -> Wbl(+)l(-)q) = 123(-31)(+33)(stat)(-23)(+29)(syst) fb, ...Journal Article -
Search for new physics in events with a leptonically decaying Z boson and a large transverse momentum imbalance in proton–proton collisions at √s = 13 TeV
(2018)The European Physical Journal CA search for new physics in events with a Z boson produced in association with large missing transverse momentum at the LHC is presented. The search is based on the 2016 data sample of proton-proton collisions recorded with the CMS experiment at s√=13TeV, corresponding to an integrated luminosity of 35.9fb−1. The results of this search are interpreted in terms of a simplified model of dark matter production via spin-0 or spin-1 mediators, ...Journal Article -
Search for pair production of vector-like quarks in the bW(b)over-barW channel from proton-proton collisions at root s=13TeV
(2018)Physics Letters BA search is presented for the production of vector-like quark pairs, T (T) over bar or Y (Y) over bar, with electric charge of 2/3(T) or -4/3(Y), in proton-proton collisions at root s= 13 TeV. The data were collected by the CMS experiment at the LHC in 2016 and correspond to an integrated luminosity of 35.8 fb(-1). The T and Y quarks are assumed to decay exclusively to a W boson and a b quark. The search is based on events with a single ...Journal Article -
Search for a massive resonance decaying to a pair of Higgs bosons in the four b quark final state in proton–proton collisions at √ s = 13 TeV
(2018)Physics Letters BA search for a massive resonance decaying into a pair of standard model Higgs bosons, in a final state consisting of two b quark–antiquark pairs, is performed. A data sample of proton–proton collisions at a centre-of-mass energy of 13 TeV is used, collected by the CMS experiment at the CERN LHC in 2016, and corresponding to an integrated luminosity of 35.9fb −1. The Higgs bosons are highly Lorentz-boosted and are each reconstructed as a ...Journal Article -
Constraints on the chiral magnetic effect using charge-dependent azimuthal correlations in pPb and PbPb collisions at the CERN Large Hadron Collider
(2018)Physical Review CCharge-dependent azimuthal correlations of same- and opposite-sign pairs with respect to the second- and third-order event planes have been measured in pPb collisions at √sNN=8.16TeV and PbPb collisions at 5.02 TeV with the CMS experiment at the LHC. The measurement is motivated by the search for the charge separation phenomenon predicted by the chiral magnetic effect (CME) in heavy ion collisions. Three- and two-particle azimuthal ...Journal Article -
Search for vectorlike light-flavor quark partners in proton-proton collisions at √s =8 TeV
(2018)Physical Review DA search is presented for heavy vectorlike quarks (VLQs) that couple only to light quarks in proton-proton collisions at √s=8 TeV at the LHC. The data were collected by the CMS experiment during 2012 and correspond to an integrated luminosity of 19.7 fb−1. Both single and pair production of VLQs are considered. The single-production search is performed for down-type VLQs (electric charge of magnitude 1/3), while the pair-production ...Journal Article