Rectorate / Rektörlük

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  • Book Part
    Eu as a Good (enough) Governance Exporter in Kosovo? Local Views on the Aborted Kosovo E Re Power Plant Project
    (Springer, 2022) Buhari Gülmez, Didem; Aydın Dikmen, Bengü
    This study focuses on the EU's perceived role in Kosovo as a good governance exporter through political conditionality. Local debates on the EU's stance towards the recently aborted coal power plant project (Kosovo e Re) reflect a disappointment with the EU's failure to prioritise good governance reforms that have not been implemented sufficiently in Kosovo. The study mainly benefits from interviews conducted in Pristina in 2019 in order to explore various EU, domestic and international factors hindering the EU's capability as a good governance exporter. Following the EU's limited transformative agency in contested states, it concludes that the EU is perceived by local actors in Kosovo as a "good enough governance" exporter that favours stability in the region and transatlantic partnership at the expense of good governance reforms. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2022.
  • Book Part
    Citation - Scopus: 1
    Field Experiments in Bargaining
    (Springer, 2022) Dindaroğlu, Burak; Ertaç, Seda
    Understanding price formation and surplus division in bargaining contexts has long been of interest to economists. Laboratory experiments contribute to our understanding of bargaining by inducing valuations and costs, which are usually unobserved in natural negotiation settings, and allow control over the negotiation process. Field experiments, on the other hand, allow economists to study bargaining in more natural contexts with higher external validity, and can be particularly useful when bargaining behavior draws on context-specific characteristics and experiences that may be stripped in lab settings or involves biases that would not surface under observability. In this chapter, we provide an overview of field experiments studying bargaining behavior and outcomes in a variety of settings, from bargaining for auto rickshaw to markets for livestock. We offer a methodological discussion, position field experiments in bargaining in the tradition of field experiments in economics at large, and highlight difficulties in the design and implementation of fieldwork for such environments. We also discuss potential areas and issues where future field experiments are of special importance for understanding price formation in bargaining. © The Editor(s) (if applicable) and The Author(s), under exclusive licence to Springer Nature Switzerland AG 2022.
  • Book Part
    Citation - Scopus: 1
    Destined for Coal?: a "hierarchy of Harms" and the Prospects of Renewable Energy in Kosovo
    (Springer, 2022) Aydın Dikmen, Bengü; Buhari Gülmez, Didem
    Relying on interviews conducted in the summer of 2019 with parliamentary advisors, civil society activists, public officials and the EU, OSCE, and UNDP missions in Kosovo, this study provides an overview of the debates about the building of the new coal power plant by a US-led (UK-based) Company ContourGlobal. It discusses how different actors in Kosovo state and society approach the renewable energy question. An important obstacle against Kosovo's transition to renewable energy derives from the absence of consensus about the main threats and goals facing Kosovo. In this context, rationalist and constructivist stances imply different "hierarchies of harms". © The Author(s), under exclusive license to Springer Nature Switzerland AG 2022. All rights reserved.
  • Correction
    Citation - WoS: 1
    Citation - Scopus: 2
  • Article
    Citation - WoS: 3
    Citation - Scopus: 5
    Search for Strongly Interacting Massive Particles Generating Trackless Jets in Proton-Proton Collisions at Root S=13 Tev
    (Springer, 2022) Karapınar, Güler; CMS Collaboration
    A search for dark matter in the form of strongly interacting massive particles (SIMPs) using the CMS detector at the LHC is presented. The SIMPs would be produced in pairs that manifest themselves as pairs of jets without tracks. The energy fraction of jets carried by charged particles is used as a key discriminator to suppress efficiently the large multijet background, and the remaining background is estimated directly from data. The search is performed using proton-proton collision data corresponding to an integrated luminosity of 16.1 fb(-1), collected with the CMS detector in 2016. No significant excess of events is observed above the expected background. For the simplified dark matter model under consideration, SIMPs with masses up to 100 GeV are excluded and further sensitivity is explored towards higher masses.
  • Article
    Citation - WoS: 5
    Citation - Scopus: 9
    Search for Resonances Decaying To Three W Bosons in Proton-Proton Collisions at Root S=13 Tev
    (American Physical Society, 2022) Karapınar, Güler; CMS Collaboration
    A search for resonances decaying into a W boson and a radion, where the radion decays into two W bosons, is presented. The data analyzed correspond to an integrated luminosity of 138 fb???1 recorded in ffiffiproton-proton collisions with the CMS detector at p s 1/4 13 TeV. One isolated charged lepton is required, together with missing transverse momentum and one or two massive large-radius jets, containing the decay products of either two or one W bosons, respectively. No excess over the background estimation is observed. The results are combined with those from a complementary channel with an all-hadronic final state, described in an accompanying paper. Limits are set on parameters of an extended warped extradimensional model. These searches are the first of their kind at the LHC.
  • Article
    Citation - WoS: 25
    Citation - Scopus: 32
    Using Z Boson Events To Study Parton-Medium Interactions in Pb-Pb Collisions
    (American Physical Society, 2022) Karapınar, Güler
    The spectra measurements of charged hadrons produced in the shower of a parton originating in the same hard scattering with a leptonically decaying Z boson arc reported in lead-lead nuclei (Pb-Pb) and proton-proton (pp) collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV. Both Pb-Pb and pp data sets are recorded by the CMS experiment at the LHC and correspond to an integrated luminosity of 1.7 nb(-1) and 320 pb(-1), respectively. Hadronic collision data with one reconstructed Z boson candidate with the transverse momentum p(T) > 30 GeV/c are analyzed. The Z boson constrains the initial energy and direction of the associated parton. In heavy ion events, azimuthal angular distributions of charged hadrons with respect to the direction of a Z boson are sensitive to modifications of the in-medium parton shower and medium response. compared to reference data from pp interactions, the results for central Pb-Pb collisions indicate a modification of the angular correlations. The measurements of the fragmentation functions and p(T) spectra of charged particles in Z boson events, which are sensitive to medium modifications of the parton shower longitudinal structure, are also reported. Significant modifications in central Pb-Pb events compared to the pp reference data are also found for these observables.
  • Article
    Citation - WoS: 35
    Citation - Scopus: 41
    Search for Heavy Resonances Decaying To Ww, Wz, or Wh Boson Pairs in a Final State Consisting of a Lepton and a Large-Radius Jet in Proton-Proton Collisions at Root S=13 Tev
    (American Physical Society, 2022) Karapınar, Güler
    A search for new heavy resonances decaying to pairs of bosons (WW, WZ, or WH) is presented. The analysis uses data from proton-proton collisions collected with the CMS detector at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 137 fb(-1). One of the bosons is required to be a W boson decaying to an electron or muon and a neutrino, while the other boson is required to be reconstructed as a single jet with mass and substructure compatible with a quark pair from a W, Z, or Higgs boson decay. The search is performed in the resonance mass range between 1.0 and 4.5 TeVand includes a specific search for resonances produced via vector boson fusion. The signal is extracted using a twodimensional maximum likelihood fit to the jet mass and the diboson invariant mass distributions. No significant excess is observed above the estimated background. Model-independent upper limits on the production cross sections of spin-0, spin-1, and spin-2 heavy resonances are derived as functions of the resonance mass and are interpreted in the context of bulk radion, heavy vector triplet, and bulk graviton models. The reported bounds are the most stringent to date.
  • Article
    Citation - WoS: 8
    Citation - Scopus: 6
    Search for High-Mass Resonances Decaying To a Jet and a Lorentz-Boosted Resonance in Proton-Proton Collisions at Root S=13 Tev
    (Elsevier, 2022) Karapınar, Güler
    A search is reported for high-mass hadronic resonances that decay to a parton and a Lorentz-boosted resonance, which in turn decays into a pair of partons. The search is based on data collected with the CMS detector at the LHC in proton-proton collisions at root s = 13 TeV, corresponding to an integrated luminosity of 138 fb(-1). The boosted resonance is reconstructed as a single wide jet with substructure consistent with a two-body decay. The high-mass resonance is thus considered as a dijet system. The jet substructure information and the kinematic properties of cascade resonance decays are exploited to disentangle the signal from the large quantum chromodynamics multijet background. The dijet mass spectrum is analyzed for the presence of new high-mass resonances, and is found to be consistent with the standard model background predictions. Results are interpreted in a warped extra dimension model where the high-mass resonance is a Kaluza-Klein gluon, the boosted resonance is a radion, and the final state partons are all gluons. Limits on the production cross section are set as a function of the Kaluza-Klein gluon and radion masses. These limits exclude at 95% confidence level models with Kaluza-Klein gluon masses in the range 2.0 to 4.3 TeV and radion masses in the range 0.20 to 0.74TeV. By exploring a novel experimental signature, the observed limits on the Kaluza-Klein gluon mass are extended by up to about 1 TeV compared to previous searches. (C) 2022 The Author(s). Published by Elsevier B.V.
  • Article
    Citation - WoS: 22
    Citation - Scopus: 34
    Search for New Physics in the Lepton Plus Missing Transverse Momentum Final State in Proton-Proton Collisions at Root S=13 Tev
    (Springer, 2022) Karapınar, Güler; CMS Collaboration
    A search for physics beyond the standard model (SM) in final states with an electron or muon and missing transverse momentum is presented. The analysis uses data from proton-proton collisions at a centre-of-mass energy of 13 TeV, collected with the CMS detector at the LHC in 2016-2018 and corresponding to an integrated luminosity of 138 fb(-1). No significant deviation from the SM prediction is observed. Model-independent limits are set on the production cross section of W' bosons decaying into lepton-plus-neutrino final states. Within the framework of the sequential standard model, with the combined results from the electron and muon decay channels a W' boson with mass less than 5.7 TeV is excluded at 95% confidence level. Results on a SM precision test, the determination of the oblique electroweak W parameter, are presented using LHC data for the first time. These results together with those from the direct W' resonance search are used to extend existing constraints on composite Higgs scenarios. This is the first experimental exclusion on compositeness parameters using results from LHC data other than Higgs boson measurements.