Demir, Durmuş Ali
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Demir, Durmuş Ali.
Demir, D. A.
Demir, D. A.
Job Title
Email Address
durmusdemir@iyte.edu.tr
Main Affiliation
04.05. Department of Pyhsics
Status
Former Staff
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WoS Researcher ID
Sustainable Development Goals
1NO POVERTY
0
Research Products
2ZERO HUNGER
1
Research Products
3GOOD HEALTH AND WELL-BEING
1
Research Products
4QUALITY EDUCATION
1
Research Products
5GENDER EQUALITY
0
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6CLEAN WATER AND SANITATION
0
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7AFFORDABLE AND CLEAN ENERGY
2
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8DECENT WORK AND ECONOMIC GROWTH
1
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9INDUSTRY, INNOVATION AND INFRASTRUCTURE
11
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10REDUCED INEQUALITIES
0
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11SUSTAINABLE CITIES AND COMMUNITIES
0
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12RESPONSIBLE CONSUMPTION AND PRODUCTION
1
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13CLIMATE ACTION
2
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14LIFE BELOW WATER
1
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15LIFE ON LAND
1
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16PEACE, JUSTICE AND STRONG INSTITUTIONS
0
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17PARTNERSHIPS FOR THE GOALS
0
Research Products
Documents
120
Citations
2968
h-index
26
This researcher does not have a WoS ID.
Scholarly Output
178
Articles
152
Views / Downloads
138614/56551
Supervised MSc Theses
17
Supervised PhD Theses
3
WoS Citation Count
11935
Scopus Citation Count
11833
Patents
0
Projects
6
WoS Citations per Publication
67.05
Scopus Citations per Publication
66.48
Open Access Source
175
Supervised Theses
20
| Journal | Count |
|---|---|
| Journal of High Energy Physics | 44 |
| Journal of Instrumentation | 31 |
| Physical Review Letters | 21 |
| Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | 17 |
| Physical Review D - Particles, Fields, Gravitation and Cosmology | 14 |
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178 results
Scholarly Output Search Results
Now showing 1 - 10 of 178
Master Thesis F (metric-Affine) Gravity: Disformal and Cross-Curvature Effects(Izmir Institute of Technology, 2019) Samaner, Çağlar; Demir, Durmuş Ali; Demir, Durmuş AliThe present thesis consists of two main studies, in the first part, after giving a brief formulation of gravity theories on the metric, affine and metric-affine frameworks, we study the effects of the disformal coupling term \epsilon R_{\mu\nu} V^mu V^nu. We track the effects of disformal term up to field equations, then construct the Einstein tensor G_{\mu\nu} and subsequently identify an effective energy-momentum tensor T_{\mu\nu} to extract effective energy density and pressure. We conclude the first part by comparing the results of metric-affine disformal theory with metrical disformal theory. In the second part, we study the cosmological effects of cross-curvature theory with the functional F (R,R). We derive the both Friedmann equations with the general functional F (R, R) and compare our findings with the known F (R) theory results.Article Citation - WoS: 33Citation - Scopus: 44CMS Data Processing Workflows During an Extended Cosmic Ray Run(IOP Publishing Ltd., 2010) Demir, Durmuş Ali; Karapınar, GülerThe CMS Collaboration conducted a month-long data taking exercise, the Cosmic Run At Four Tesla, during October-November 2008, with the goal of commissioning the experiment for extended operation. With all installed detector systems participating, CMS recorded 270 million cosmic ray events with the solenoid at a magnetic field strength of 3.8 T. This paper describes the data flow from the detector through the various online and offline computing systems, as well as the workflows used for recording the data, for aligning and calibrating the detector, and for analysis of the data. © 2010 IOP Publishing Ltd and SISSA.Article Citation - WoS: 82Citation - Scopus: 77Charged Particle Transverse Momentum Spectra in Pp Collisions at ?s = 0:9 and 7 Tev(Springer Verlag, 2011) Karapınar, Güler; Demir, Durmuş AliThe charged particle transverse momentum (pT) spectra are presented for pp collisions at √s = 0:9 and 7TeV. The data samples were collected with the CMS detector at the LHC and correspond to integrated luminosities of 231 μb-1and 2.96 pb-1, respectively. Calorimeter-based high-transverse-energy triggers are employed to enhance the statistical reach of the high-pT measurements. The results are compared with leading and next-toleading order QCD and with an empirical scaling of measurements at different collision energies using the scaling variable xT - 2pT=ps over the pT range up to 136 GeV/c. Using a combination of xT scaling and direct interpolation at fixed pT, a reference transverse momentum spectrum at √s = 2:76TeV is constructed, which can be used for studying high-pT particle suppression in the dense QCD medium produced in heavy-ion collisions at that centre-of-mass energy. Copyright CERN.Article Citation - WoS: 34Citation - Scopus: 37Search for Three-Jet Resonances in Pp Collisions at ?s=7tev(American Physical Society, 2011) Karapınar, Güler; Demir, Durmuş AliA search for three-jet hadronic resonance production in pp collisions at a center-of-mass energy of 7 TeV has been conducted by the CMS Collaboration at the LHC, using a data sample corresponding to an integrated luminosity of 35pb-1. Events with high jet multiplicity and a large scalar sum of jet transverse momenta are analyzed using a signature-based approach. The number of expected standard model background events is found to be in good agreement with the observed events. Limits on the cross section times branching ratio are set in a model of gluino pair production with an R-parity-violating decay to three quarks, and the data rule out such particles within the mass range of 200 to 280GeV/c2. © 2011 American Physical Society.Article Citation - WoS: 113Citation - Scopus: 92Performance of ?-Lepton Reconstruction and Identification in Cms(IOP Publishing Ltd., 2012) Demir, Durmuş Ali; Karapınar, GülerThe performance of τ-lepton reconstruction and identification algorithms is studied using a data sample of proton-proton collisions at s = 7 TeV, corresponding to an integrated luminosity of 36 pb-1 collected with the CMS detector at the LHC. The τ leptons that decay into one or three charged hadrons, zero or more short-lived neutral hadrons, and a neutrino are identified using final-state particles reconstructed in the CMS tracker and electromagnetic calorimeter. The reconstruction efficiency of the algorithms is measured using τ leptons produced in Z-boson decays. The τ-lepton misidentification rates for jets and electrons are determined. © 2012 CERN for the benefit of the CMS collaboration, published under license by IOP Publishing Ltd and SISSA.Article Citation - WoS: 111Citation - Scopus: 97Missing Transverse Energy Performance of the Cms Detector(IOP Publishing Ltd., 2011) Karapınar, Güler; Demir, Durmuş AliDuring 2010 the LHC delivered pp collisions with a centre-of-mass energy of 7 TeV. In this paper, the results of comprehensive studies of missing transverse energy as measured by the CMS detector are presented. The results cover the measurements of the scale and resolution for missing transverse energy, and the effects of multiple pp interactions within the same bunch crossings on the scale and resolution. Anomalous measurements of missing transverse energy are studied, and algorithms for their identification are described. The performance of several reconstruction algorithms for calculating missing transverse energy are compared. An algorithm, called missing-transverse-energy significance, which estimates the compatibility of the reconstructed missing transverse energy with zero, is described, and its performance is demonstrated. © 2011 CERN for the benefit of the CMS collaboration, published under license by IOP Publishing Ltd. SISSA.Article Citation - WoS: 100Citation - Scopus: 81Search for Physics Beyond the Standard Model in Final States With a Lepton and Missing Transverse Energy in Proton-Proton Collisions at Root S = 8 Tev(American Physical Society, 2015) Demir, Durmuş Ali; Karapınar, GülerA search for new physics in proton-proton collisions having final states with an electron or muon and missing transverse energy is presented. The analysis uses data collected in 2012 with the CMS detector, at an LHC center-of-mass energy of 8 TeV, and corresponding to an integrated luminosity of 19.7 fb(-1). No significant deviation of the transverse mass distribution of the charged lepton-neutrino system from the standard model prediction is found. Mass exclusion limits of up to 3.28 TeVat 95% confidence level for a W0-boson with the same couplings as that of the standard model W-boson are determined. Results are also derived in the framework of split universal extra dimensions, and exclusion limits on Kaluza-Klein Wd(KK)((2)) states are found. The final state with large missing transverse energy also enables a search for dark matter production with a recoiling W-boson, with limits set on the mass and the production cross section of potential candidates. Finally, limits are established for a model including interference between a left-handed W'-boson and the standard model W-boson and for a compositeness model.Article Citation - WoS: 63Citation - Scopus: 69Inclusive Search for Squarks and Gluinos in Pp Collisions at Root S=7 Tev(American Physical Society, 2012) Demir, Durmuş Ali; Karapınar, GülerA search is performed for heavy particle pairs produced in √s=7TeV proton-proton collisions with 35pb -1 of data collected by the CMS experiment at the LHC. The search is sensitive to squarks and gluinos of generic supersymmetry models, provided they are kinematically accessible, with minimal assumptions on properties of the lightest superpartner particle. The kinematic consistency of the selected events is tested against the hypothesis of heavy particle pair production using the dimensionless razor variable R, related to the missing transverse energy ETmiss. The new physics signal is characterized by a broad peak in the distribution of M R, an event-by-event indicator of the heavy particle mass scale. This new approach is complementary to ETmiss-based searches. After background modeling based on data, and background rejection based on R and M R, no significant excess of events is found beyond the standard model expectations. The results are interpreted in the context of the constrained minimal supersymmetric standard model as well as two simplified supersymmetry models. © 2012 CERN.Article Citation - WoS: 136Citation - Scopus: 115Measurement of the Underlying Event Activity at the Lhc With ?s = 7 Tev and Comparison With ?s = 0:9 Tev(Springer Verlag, 2011) Karapınar, Güler; Demir, Durmuş AliA measurement of the underlying activity in events with a jet of transverse momentum in the several GeV region is performed in proton-proton collisions at √ s = 0:9 and 7TeV, using data collected by the CMS experiment at the LHC. The production of charged particles with pseudorapidity |η|<2 and transverse momentum pT >0:5 GeV/c is studied in the azimuthal region transverse to that of the leading set of charged particles forming a track-jet. A significant growth of the average multiplicity and scalar-pT sum of the particles in the transverse region is observed with increasing pT of the leading trackjet, followed by a much slower rise above a few GeV/c. For track-jet pT larger than a few GeV/c, the activity in the transverse region is approximately doubled with a centreof- mass energy increase from 0:9 to 7TeV. Predictions of several QCD-inspired models as implemented in pythia are compared to the data.Article Citation - WoS: 10Citation - Scopus: 12Statistical Approach To Tunneling Time in Attosecond Experiments(Academic Press Inc., 2017) Demir, Durmuş Ali; Güner, TuğrulTunneling, transport of particles through classically forbidden regions, is a pure quantum phenomenon. It governs numerous phenomena ranging from single-molecule electronics to donor–acceptor transition reactions. The main problem is the absence of a universal method to compute tunneling time. This problem has been attacked in various ways in the literature. Here, in the present work, we show that a statistical approach to the problem, motivated by the imaginary nature of time in the forbidden regions, lead to a novel tunneling time formula which is real and subluminal (in contrast to various known time definitions implying superluminal tunneling). In addition to this, we show explicitly that the entropic time formula is in good agreement with the tunneling time measurements in laser-driven He ionization. Moreover, it sets an accurate range for long-range electron transfer reactions. The entropic time formula is general enough to extend to the photon and phonon tunneling phenomena.