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Bulunan: 40 Adet 0.002 sn
Yayın Tarihi : 2017 ✕Koleksiyon : Metalurji ve Malzeme ... ✕
Koleksiyon [3]
İlgili Araştırmacılar [3]
Ambargo Durumu [1]
Tam Metin [1]
Yayın Türü [4]
Yazar/lar [20]
Atıf Dizini [3]
Konu Başlıkları [20]
Yayıncı [10]
Yayın Tarihi [1]
Yayın Dili [2]
Erişime Açık

Measuring K0K± interactions using Pb–Pb collisions at √sNN = 2.76STeV

KARASU UYSAL, Ayben | ALICE Collaboration

We present the first ever measurements of femtoscopic correlations between the K0 and K± particles. The analysis was performed on the data from Pb–Pb collisions at sNN = 2.76 TeV measured by the ALICE experiment. The observed femtoscopic correlations are consistent with final-state interactions proceeding via the a0(980) resonance. The extracted kaon source radius and correlation strength parameters for K0 K− are found to be equal within the experimental uncertainties to those for K0 K+ . Comparing the S S results of the present study with those from published identical-kaon femtoscopic studie ...Daha fazlası

Makale 2017 6 Görüntülenme
Erişime Açık

Flow Dominance and Factorization of Transverse Momentum Correlations in Pb-Pb Collisions at the LHC

KARASU UYSAL, Ayben | ALICE Collaboration

We present the first measurement of the two-particle transverse momentum differential correlation function, P2 ≡ h∆pT∆pTi/hpTi 2 , in Pb–Pb collisions at √sNN = 2.76 TeV. Results for P2 are reported as a function of relative pseudorapidity (∆η) and azimuthal angle (∆ϕ) between two particles for different collision centralities. The ∆φ dependence is found to be largely independent of ∆η for |∆η| ≥ 0.9. In 5% most central Pb–Pb collisions, the two-particle transverse momentum correlation function exhibits a clear double-hump structure around ∆ϕ = π (i.e., on the away side), which is not observed ...Daha fazlası

Makale 2017 6 Görüntülenme
Erişime Açık

Measurement of the production of high-pT electrons from heavy-flavour hadron decays in Pb–Pb collisions at √sNN = 2.76 TeV

KARASU UYSAL, Ayben | ALICE Collaboration

Electrons from heavy-flavour hadron decays (charm and beauty) were measured with the ALICE detector in Pb–Pb collisions at a centre-of-mass of energy √sNN = 2.76 TeV. The transverse momentum (pT) differential production yields at mid-rapidity were used to calculate the nuclear modification factor RAA in the interval 3 < pT < 18 GeV/c. The RAA shows a strong suppression compared to binary scaling of pp collisions at the same energy (up to a factor of 4) in the 10% most central Pb–Pb collisions. There is a centrality trend of suppression, and a weaker suppression (down to a factor of 2) in semi- ...Daha fazlası

Makale 2017 3 Görüntülenme
Erişime Açık

Energy dependence of forward-rapidity J/ψ and ψ(2S) production in pp collisions at the LHC

KARASU UYSAL, Ayben | ALICE Collaboration

Abstract We present results on transverse momentum (pt) and rapidity (y) differential production cross sections, mean transverse momentum and mean transverse momen- tum square of inclusive J/ψ and ψ(2S) at forward rapid- ity (2.5 < y < 4) as well as ψ(2S)-to-J/ψ cross section ratios. These quantities are measured in pp collisions at cen- ter of mass energies √s = 5.02 and 13 TeV with the ALICE detector. Both charmonium states are reconstructed in the dimuon decay channel, using the muon spectrometer. A com- prehensive comparison to inclusive charmonium cross sec- tions measured at √s = 2.76, 7 ...Daha fazlası

Diğer 2017 8 Görüntülenme
Erişime Açık

J/ψ Elliptic Flow in Pb-Pb Collisions at sNN = 5.02 TeV

KARASU UYSAL, Ayben | ALICE Collaboration

We report a precise measurement of the J=ψ elliptic flow in Pb-Pb collisions at sNN 1⁄4 5.02 TeV with the ALICE detector at the LHC. The J=ψ mesons are reconstructed at midrapidity (jyj < 0.9) in the dielectron decay channel and at forward rapidity (2.5 < y < 4.0) in the dimuon channel, both down to zero transverse momentum. At forward rapidity, the elliptic flow v2 of the J=ψ is studied as a function of the transverse momentum and centrality. A positive v2 is observed in the transverse momentum range 2 < pT < 8 GeV=c in the three centrality classes studied and confirms with higher statistics ...Daha fazlası

Diğer 2017 4 Görüntülenme
Erişime Açık

J/ψ suppression at forward rapidity in Pb–Pb collisions at √sNN = 5.02 TeV

KARASU UYSAL, Ayben | ALICE Collaboration

The inclusive J/ψ production has been studied in Pb–Pb and pp collisions at the centre-of-mass energy per nucleon pair √sNN = 5.02 TeV, using the ALICE detector at the CERN LHC. The J/ψ meson is reconstructed, in the centre-of-mass rapidity interval 2.5 < y < 4 and in the transverse-momentum range pT < 12 GeV/c, via its decay to a muon pair. In this Letter, we present results on the inclusive J/ψ cross section in pp collisions at √s = 5.02 TeV and on the nuclear modification factor RAA. The latter is presented as a function of the centrality of the collision and, for central collisions, as a f ...Daha fazlası

Makale 2017 6 Görüntülenme
Erişime Açık

K∗(892)0 and φ(1020) meson production at high transverse momentum in pp and Pb-Pb collisions at √sNN = 2.76 TeV

KARASU UYSAL, Ayben | ALICE Collaboration

The production of K∗(892)0 and φ(1020) mesons in proton-proton (pp) and lead-lead (Pb-Pb) collisions at √sNN = 2.76 TeV has been analyzed using a high luminosity data sample accumulated in 2011 with the ALICE detector at the Large Hadron Collider (LHC). Transverse momentum (pT) spectra have been measured for K∗(892)0 and φ(1020) mesons via their hadronic decay channels for pT up to 20 GeV/c. The measurements in pp collisions have been compared to model calculations and used to determine the nuclear modification factor and particle ratios. The K∗(892)0/K ratio exhibits significant reduction fro ...Daha fazlası

Diğer 2017 4 Görüntülenme
Erişime Açık

Kaon femtoscopy in Pb-Pb collisions at √sNN = 2.76 TeV

KARASU UYSAL, Ayben | ALICE Collaboration

We present the results of three-dimensional femtoscopic analyses for charged and neutral kaons recorded by ALICEinPb-Pbcollisionsat√sNN =2.76TeV.Femtoscopyisusedtomeasurethespace-timecharacteristicsof particle production from the effects of quantum statistics and final-state interactions in two-particle correlations. Kaon femtoscopy is an important supplement to that of pions because it allows one to distinguish between different model scenarios working equally well for pions. In particular, we compare the measured three-dimensional kaon radii with a purely hydrodynamical calculation and a mod ...Daha fazlası

Makale 2017 3 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

Wear and Corrosion Resistances of Oxide Coatings formed on Magnesium Alloys by Micro Arc Oxidation

TEKİN, Mustafa | TAŞLIÇAY, Cengizhan | MUHAFFEL, Faiz | ÇİMENOĞLU, Hüseyin

In the present study, wear and corrosion resistances of magnesium alloys are analyzed after coated by micro arc oxidation (MAO) process for protection of gear component, which is the most wearing part of a bicycle. Two of the most common magnesium alloys (AZ31 and AZ91) were used in the study and they were oxidized in three different electrolytes (aluminate-, silicateand phosphate-based). Scanning electron microscope (SEM) is utilized in order to analyze the coating morphology and wear scars obtained during wear tests. Energy dispersive X-ray spectroscopy (EDS) analyses were implemented to det ...Daha fazlası

Konferans Bildirisi 2017 Trans Tech Publications 5 Görüntülenme
Erişime Açık

Enhanced production of multi-strange hadrons in high-multiplicity proton–proton collisions

KARASU UYSAL, Ayben | ALICE Collaboration

At sufficiently high temperature and energy density, nuclear matter undergoes a transition to a phase in which quarks and gluons are not confined: the quark–gluon plasma (QGP)1. Such an exotic state of strongly interacting quantum chro- modynamics matter is produced in the laboratory in heavy nuclei high-energy collisions, where an enhanced production of strange hadrons is observed2–6. Strangeness enhancement, originally proposed as a signature of QGP formation in nuc- lear collisions7 , is more pronounced for multi-strange baryons. Several effects typical of heavy-ion phenomenology have been ...Daha fazlası

Makale 2017 2 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
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