334 research outputs found
Recent results from PHENIX on the evolution of hot QCD
No full textThe Relativistic Heavy Ion Collider’s (RHIC) energy scan program explores the phase transition between the hadron gas and the quark gluon plasma phases by varying center-of-mass energies from √sNN = 7.7 to 200 GeV and using various system sizes. The nuclear modification factor of π0 and the azimuthal anisotropy of charged hadrons were measured in Au+Au collisions at c.m. energies √sNN = 39, 62.4 and 200 GeV. In addition, we present recent results of direct photon yield and anisotropy measurements in Au+Au collisions at c.m. energy √sNN = 200 GeV
Small Collision Systems at RHIC
No full textThe observation of long range correlations in highly asymmetric systems, as in p+Pb and d+Au collisions, suggests a creation of a medium with collective behavior. It is still an open question if the quark-gluon plasma is formed in these collision. Hence, the RHIC collider invested time to study the small systems in different collision systems and energies. Here we discuss the recent results from the PHENIX and STAR collaborations in four different collision systems p+Al, p+Au, d+Au and 3He+Au at sNN = 200 GeV, and also for the energy scan in d+Au collisions between sNN = 19.6 – 200 GeV
Direct photon analyses with the PHENIX detector
No full textTalk presented at the Zimanyi School 2016 conferenc
Photon measurements in proton and nucleus collisions at PHENIX
No full textDirect photons provide an excellent probe in studying both the proton and nucleus collisions. The PHENIX measurements of the direct photon-hadron and neutral pion-hadron correlations in p+p collisions searches for the breakdown of the QCD factorization. The measurements of the fragmentation functions in Au+Au collisions provide an excellent tool to understand the dynamics of the energy loss mechanism in the heavy ion collisions. Furthermore, we summarize the results on the direct photon measurements at low-pT in order to study the thermal radiation in Au+Au and Cu+Cu collisions at different collision energies
Study of the neutral pion and direct photon production in Au+Au collisions at √sNN=39-200 GeV
No full textunknown accessibilityei tietoa saavutettavuudest
Initial Stages 2021
No full textWe will present the design and physics performance of a high-granularity Forward Calorimeter (FoCal) upgrade for ALICE. The main goal of the FoCal detector is to measure isolated direct photon production to constrain the low-x gluon density in the proton and nuclei and to look for deviations from linear QCD evolution in the high gluon-density regime. In addition, correlation measurements using forward hadrons and photons will be used to explore possible CGC effects as well as long-range flow-like phenomena.
The detector will cover the pseudorapidity range from 3.4 to 5.8 with a Si-W electromagnetic calorimeter (ECal) with pad and pixel readout and a hadronic calorimeter with conventional metal-scintillator technology with optical readout.
The high granularity of the ECal will allow us to separate decay photons from neutral pions with unprecedented spatial resolution, providing a reconstruction efficiency for neutral pions above 80% over a large range in transverse momentum.
The impact of the direct photon measurements with the FoCal on the gluon density is evaluated by reweighting the nNNPDF 2.0 nuclear PDFs with pseudo data. It is shown that the FoCal accesses a unique small-x range down to
Identified light hadron measurements from large to small systems from PEHENIX
No full textTalk presented at the Winter Workshop on Nuclear Dynamics 2022 conferenc
Sample code to access EMCal timing information, producing Ntuple for timing (re)calibration
No full text<p>Sample code to access the two basic EMCal data objects, emcClusterContainer and emcTowerContainer, writing out data necessary to do timing calibration, including walk correction into an Ntuple.</p>
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