Rectorate / Rektörlük

Permanent URI for this collectionhttps://hdl.handle.net/11147/6849

Browse

Filters

20212

Settings

Publisher: search.filters.publisher.Amer Physical SocSubject: search.filters.subject.Proton–proton collisions

Search Results

Now showing 1 - 2 of 2
  • Article
    Citation - WoS: 9
    Citation - Scopus: 15
    Constraints on the Initial State of Pb-Pb Collisions Via Measurements of Z-Boson Yields and Azimuthal Anisotropy at Root S(nn)=5.02 Tev
    (Amer Physical Soc, 2021) Karapınar, Güler; CMS Collaboration
    The CMS experiment at the LHC has measured the differential cross sections of Z bosons decaying to pairs of leptons, as functions of transverse momentum and rapidity, in lead-lead collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV. The measured Z boson elliptic azimuthal anisotropy coefficient is compatible with zero, showing that Z bosons do not experience significant final-state interactions in the medium produced in the collision. Yields of Z bosons are compared to Glauber model predictions and are found to deviate from these expectations in peripheral collisions, indicating the presence of initial collision geometry and centrality selection effects. The precision of the measurement allows, for the first time, for a data-driven determination of the nucleon-nucleon integrated luminosity as a function of lead-lead centrality, thereby eliminating the need for its estimation based on a Glauber model.
  • Article
    Citation - WoS: 18
    Citation - Scopus: 22
    Measurement of the W Gamma Production Cross Ssection in Proton-Proton Collisions at Root S=13 Tev and Constraints on Effective Field Theory Coefficients
    (Amer Physical Soc, 2021) Karapınar, Güler; CMS Collaboration
    A fiducial cross section for W gamma production in proton-proton collisions is measured at a center-of-mass energy of 13 TeV in 137 fb(-1) of data collected using the CMS detector at the LHC. The W -> e nu and mu nu decay modes are used in a maximum-likelihood fit to the lepton-photon invariant mass distribution to extract the combined cross section. The measured cross section is compared with theoretical expectations at next-to-leading order in quantum chromodynamics. In addition, 95% confidence level intervals are reported for anomalous triple-gauge couplings within the framework of effective field theory.