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Koleksiyon : Mühendislik ve Doğa ... ✕
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Erişime Açık

Longitudinal asymmetry and its effect on pseudorapidity distributions in Pb–Pb collisions at √sNN = 2.76 TeV

KARASU UYSAL, Ayben | ALICE Collaboration

First results on the longitudinal asymmetry and its effect on the pseudorapidity distributions in Pb–Pb collisions at √sNN = 2.76 TeV at the Large Hadron Collider are obtained with the ALICE detector. The longitudinal asymmetry arises because of an unequal number of participating nucleons from the two colliding nuclei, and is estimated for each event by measuring the energy in the forward neutron-Zero- Degree-Calorimeters (ZNs). The effect of the longitudinal asymmetry is measured on the pseudorapidity distributions of charged particles in the regions |η| < 0.9, 2.8 < η < 5.1 and −3.7 < η < −1 ...Daha fazlası

Makale 2018 7 Görüntülenme
Erişime Açık

Linear and non-linear flow mode in Pb–Pb collisions at √sNN = 2.76 TeV

KARASU UYSAL, Ayben | ALICE Collaboration

he second and the third order anisotropic flow, V2 and V3, are mostly determined by the corresponding initial spatial anisotropy coefficients, ε2 and ε3, in the initial density distribution. In addition to their dependence on the same order initial anisotropy coefficient, higher order anisotropic flow, Vn (n > 3), can also have a significant contribution from lower order initial anisotropy coefficients, which leads to mode-coupling effects. In this Letter we investigate the linear and non-linear modes in higher order anisotropic flow Vn for n = 4, 5, 6 with the ALICE detector at the Large Hadr ...Daha fazlası

Makale 2017 5 Görüntülenme
Erişime Açık

Forward-backward multiplicity correlations in pp collisions at √s = 0.9, 2.76 and 7 TeV

KARASU UYSAL, Ayben | ALICE Collaboration

The strength of forward-backward (FB) multiplicity correlations is measured √ s = 0.9, 2.76 and 7TeV. The measurement is performed in the central pseudorapidity region (|η| < 0.8) for the transverse momentum pT > 0.3GeV/c. Two separate pseudorapidity windows of width (δη) ranging from 0.2 to 0.8 are chosen symmetrically around η = 0. The multiplicity correlation strength (bcorr) is studied as a function of the pseudorapidity gap (ηgap) between the two windows as well as the width of these windows. The correlation strength is found to decrease with increasing ηgap and shows a non-linear increas ...Daha fazlası

Makale 2015 2 Görüntülenme
Erişime Açık

Neutral pion and η meson production in p–Pb collisions at √sNN = 5.02 TeV

KARASU UYSAL, Ayben | ALICE Collaboration

Neutral pion and η meson invariant differential yields were measured in non-single diffractive p–Pb colli- sions at √sNN = 5.02 TeV with the ALICE experiment at the CERN LHC. The analysis combines results from three complementary photon measurements, utilizing the PHOS and EMCal calorimeters and the Photon Conversion Method. The invariant differential yields of π0 and η meson inclu- sive production are measured near mid-rapidity in a broad transverse momentum range of 0.3 < pT < 20 GeV/c and 0.7 < pT < 20 GeV/c, respectively. The measured η/π0 ratio increases with pT and saturates for pT > 4 G ...Daha fazlası

Makale 2018 2 Görüntülenme
Erişime Açık

Neutral pion and η meson production at midrapidity in Pb-Pb collisions at √sNN = 2.76 TeV

KARASU UYSAL, Ayben | ALICE Collaboration

Neutral pion and η meson production in the transverse momentum range 1 < pT < 20 GeV/c have been measured at midrapidity by the ALICE experiment at the Large Hadron Collider (LHC) in central and semicentral Pb-Pb collisions at √sNN = 2.76 TeV. These results were obtained using the photon conversion method as well as the Photon Spectrometer (PHOS) and Electromagnetic Calorimeter detectors. The results extend the upper pT reach of the previous ALICE π0 measurements from 12 to 20 GeV/c and present the first measurement of η meson production in heavy-ion collisions at the LHC. The η/π0 ratio is si ...Daha fazlası

Makale 2018 4 Görüntülenme
Erişime Açık

Production of muons from heavy-flavour hadron decays in p–Pb collisions at √sNN = 5.02 TeV

KARASU UYSAL, Ayben | ALICE Collaboration

The production of muons from heavy-flavour hadron decays in p–Pb collisions at √sNN = 5.02 TeV was studied for 2 < pT < 16 GeV/c with the ALICE detector at the CERN LHC. The measurement was performed at forward (p-going direction) and backward (Pb-going direction) rapidity, in the ranges of rapidity in the centre-of-mass system (cms) 2.03 < ycms < 3.53 and −4.46 < ycms < −2.96, respectively. The production cross sections and nuclear modification factors are presented as a function of transverse momentum (pT). At forward rapidity, the nuclear modification factor is compatible with unity while a ...Daha fazlası

Makale 2017 7 Görüntülenme
Erişime Açık

Centrality dependence of the nuclear modification factor of charged pions, kaons, and protons in Pb-Pb collisions at √sNN = 2.76 TeV

KARASU UYSAL, Ayben | ALICE Collaboration

Transverse momentum (pT) spectra of pions, kaons, and protons up to pT = 20 GeV/c have been measured in Pb-Pb collisions at √sNN = 2.76 TeV using the ALICE detector for six different centrality classes covering 0%–80%. The proton-to-pion and the kaon-to-pion ratios both show a distinct peak at pT ≈ 3 GeV/c in central Pb-Pbcollisionsthatdecreasesformoreperipheralcollisions.ForpT >10GeV/c,then uclear modification factor is found to be the same for all three particle species in each centrality interval within systematic uncertainties of 10%–20%. This suggests there is no direct interplay between ...Daha fazlası

Makale 2016 5 Görüntülenme
Erişime Açık

Evolution of the longitudinal and azimuthal structure of the near-side jet peak inPb-Pb collisions at √sNN =2.76TeV

KARASU UYSAL, Ayben | ALICE Collaboration

https://hdl.handle.net/20.500.12498/625

Makale 2017 5 Görüntülenme
Erişime Açık

Neutral pion production at midrapidity in pp and Pb–Pb collisions at √sNN = 2.76 TeV

KARASU UYSAL, Ayben | ALICE Collaboration

Invariant yields of neutral pions at midrapidity in the transverse momentum range 0.6 < pT < 12 GeV/c measured in Pb–Pb collisions at √sNN = 2.76 TeV are presented for six centrality classes. The pp reference spectrum was measured in the range 0.4 < pT < 10 GeV/c at the same centerof-mass energy. The nuclear modification factor, RAA, shows a suppression of neutral pions in central Pb–Pb collisions by a factor of up to about 8−10 for 5 pT 7 GeV/c. The presented measurements are compared with results at lower center-of-mass energies and with theoretical calculations

Makale 2014 4 Görüntülenme
Erişime Açık

Event-shape and multiplicity dependence of freeze-out radii in pp collisions at √s = 7 TeV

KARASU UYSAL, Ayben | ALICE Collaboration

Two-particle correlations in high-energy collision experiments enable the extraction of particle source radii by using the Bose-Einstein enhancement of pion production at low relative momentum q ∝ 1/R. It was previously observed that in pp collisions at √s = 7 TeV the average pair transverse momentum kT range of such analyses is limited due to large background correlations which were attributed to mini-jet phenomena. To investigate this further, an event-shape dependent analysis of Bose-Einstein correlations for pion pairs is performed in this work. By categorizing the events by their transver ...Daha fazlası

Makale 2019 10 Görüntülenme
Erişime Açık

Particle identification in ALICE: a Bayesian approach

KARASU UYSAL, Ayben | ALICE Collaboration

We present a Bayesian approach to particle identification (PID) within the ALICE experiment. The aim is to more effectively combine the particle identification capabilities of its various detectors. After a brief explanation of the adopted methodology and formalism, the performance of the Bayesian PID ap- proach for charged pions, kaons and protons in the central barrel of ALICE is studied. PID is performed via measurements of specific energy loss (dE/dx) and time of flight. PID efficiencies and misidentifica- tion probabilities are extracted and compared with Monte Carlo simulations using hig ...Daha fazlası

Makale 2016 5 Görüntülenme
Erişime Açık

Recommendations for calculation of strengthened brick walls with perforated plates

ÖZBEK, Eray | AYKAÇ, Bengi | CAN, Hüsnü | KALKAN, İlker | AYKAÇ, SabahattiN

There are many studies relating to the strengthening of infill brick walls, which contribute partially to the resistance against the seismic forces, by using different methods and materials to make them behave similarly to a ductile RC walled system. Unlike other research, studies using perforated steel plates have improved behavior on ductility as well as strength. Experimental results show that there is no significant loss of strength even at relative floor drift ratios up to 7.5%. The aim of the present study is to generate calculation and modelling approaches for designers who choose this ...Daha fazlası

Makale 2019 Gazi Universitesi Muhendislik-Mimarlik 2 Görüntülenme
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