A search for flavor-changing neutral current interactions of the top quark (t) and the Higgs boson (H) is presented. The search is based on proton-proton collision data collected in 2016–2018 at a center-of-mass energy of 13 TeV with the CMS detector at the LHC, and corresponding to an integrated luminosity of 138 fb−1. Events containing a pair of leptons with the same-sign electric charge and at least one jet are considered. The results are used to constrain the branching fraction (B) of the top...
The first search for a heavy neutral spin-1 gauge boson (Z′) with nonuniversal fermion couplings produced via vector boson fusion processes and decaying to tau leptons or W bosons is presented. The analysis is performed using LHC data at s=13 TeV, collected from 2016 to 2018 with the CMS experiment and corresponding to an integrated luminosity of 138 fb−1. The data are consistent with the standard model predictions. Upper limits are set on the product of the cross section for production of the...
Charged hadron elliptic anisotropies (v2) are presented over a wide transverse momentum (pT) range for proton-lead (pPb) and lead-lead (PbPb) collisions at nucleon-nucleon center-of-mass energies of 8.16 and 5.02 TeV, respectively. The data were recorded by the CMS experiment and correspond to integrated luminosities of 186 and 0.607 nb−1 for the pPb and PbPb systems, respectively. A four-particle cumulant analysis is performed using subevents separated in pseudorapidity to effectively suppress...
Abstract
Measurements of light-by-light scattering (LbL, γγ → γγ) and the Breit-Wheeler process (BW, γγ →
e
+
e
−
) are reported in ultraperipheral PbPb collisions at a centre-of-mass energy per nucleon pair of 5.02 TeV. The data sample, corresponding to an integrated luminosity of 1.7 nb
−1, was collected by the CMS experiment at the CERN LHC in 2018. Events with an exclusively produced...
Abstract
The first measurement of the dijet transverse momentum balance x
j
in proton-lead (pPb) collisions at a nucleon-nucleon center-of-mass energy of
$$\sqrt{{s}_{\text{NN}}}$$
= 8.16 TeV is presented. The x
j
observable, defined as the ratio of the subleading over leading jet transverse momentum in a dijet pair, is used to search for jet quenching effects. The data,...