Gavin Niendorf

Measurement of B meson production fraction ratios in proton-proton collisions at $\sqrt{s}$ = 13 TeV using open-charm and charmonium decays

Aram Hayrapetyan, Vladimir Makarenko, Armen Tumasyan, Wolfgang Adam et autres

Production fraction ratios of B$^+$, B$^0$, and B$^0_\mathrm{s}$ mesons are measured in proton-proton collisions at $\sqrt{s}$ = 13 TeV using a special data set recorded in 2018 with high-rate triggers designed to collect an unbiased sample of $10^{10}$ b hadrons with the …

High-level hadronic tau lepton triggers of the CMS experiment in proton-proton collisions at $\sqrt{s}$ = 13.6 TeV

Aram Hayrapetyan, Vladimir Makarenko, Armen Tumasyan, Wolfgang Adam et autres

The trigger system of the CMS detector is pivotal in the acquisition of data for physics measurements and searches. Studies of final states characterized by hadronic decays of tau leptons require the reconstruction and the identification of genuine tau leptons against quark- …

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Influence of strangeness on the anisotropic flow of prompt D$^\pm_\mathrm{s}$ mesons in PbPb collisions at $\sqrt{s_\mathrm{NN}}$ = 5.02 TeV

Andrey Belyaev, Aram Hayrapetyan, Armen Tumasyan, Wolfgang Adam et autres

The azimuthal anisotropy of prompt D$^\pm_\mathrm{s}$ mesons produced in lead-lead (PbPb) collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV is measured using data obtained with the CMS detector. The dataset corresponds to an integrated luminosity of 0.58 nb$^{-1}$. The azimuthal anisotropy …

Measurement of event shape variables using charged particles inside jets in proton-proton collisions at $\sqrt{s}$ = 13 TeV

Aram Hayrapetyan, Vladimir Makarenko, Armen Tumasyan, Wolfgang Adam et autres

Event shape variables, constructed from the four-momenta of the final-state objects in an event, are sensitive to the predictions of quantum chromodynamics in multijet production. A measurement of five event shape variables is presented, using proton-proton collision data collected at a centre-of-mass …

Probing early parton emissions in heavy ion collisions using the Lund jet plane

Andrey Belyaev, Aram Hayrapetyan, Armen Tumasyan, Wolfgang Adam et autres

In scattering experiments, high-virtuality partons, i.e., quarks and gluons, initiate a series of additional parton emissions to create collimated sprays of particles known as jets. This paper presents a measurement of the Lund jet plane (LJP) of high-energy jets produced in lead-lead …

Observation of $Υ$(1S) + Z associated production and measurement of the effective double-parton scattering cross section in proton-proton collisions at $\sqrt{s}$ = 13 TeV

Aram Hayrapetyan, Vladimir Makarenko, Armen Tumasyan, Wolfgang Adam et autres

The observation of associated production of an $Υ$(1S) meson with a Z boson and a measurement of the ratio of its fiducial cross section to the fiducial cross section of the Z boson are presented. Both the $Υ$(1S) meson and the Z …

Observation of a family of all-charm tetraquarks

Aram Hayrapetyan, Vladimir Makarenko, Armen Tumasyan, Wolfgang Adam et autres

Three structures, X(6600), X(6900), and X(7100), have emerged from the J$/ψ\,$J$/ψ$ (J$/ψ$\to$μ^+μ^-$) mass spectrum. These are candidates of all-charm tetraquarks, an exotic form of hadronic matter. A clearer picture of these states is obtained using proton-proton collision data collected by the CMS …

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