Abstract
Particle collider experiments generate huge volumes of complex data, and event displays provide a useful visual representation to accelerate the learning process towards physics results. ...Event displays are also used to verify expected behaviour, identify anomalous data, or explain important results. They often have a steep learning curve, a high barrier to entry, or are tightly bound to a specific environment. The upgrade of ALICE in preparation for Run 3 of the LHC requires modifications to existing event displays. We present here a cross-platform, browser-based event display, focused on interactive 2-dimensional projections of collision data from ALICE, specifically focused on the operation of the Transition Radiation Detector (TRD). It is driven by a flexible intermediate JSON data format suitable for web-based displays, and a generic task to convert existing data acquired in previous runs to this format. The relationship between raw and reconstructed data in the TRD is illustrated through a novel pairing of raw and reconstructed data in a unified interactive view. A formal design study methodology was used to guide these choices, and the display was evaluated by both scientists and the public, through a series of case studies.
The measurement of
γ
+
jet
events with a direct photon in coincidence with an energetic parton can provide unique insights into the propagation and fragmentation of the parton in the presence of the ...hot and dense medium created in heavy-ion collisions. One way to explore these effects is the study of azimuthal correlations between the direct photon and hadrons produced in the fragmentation.
We present azimuthal correlations between photons with a transverse momentum of more than 10 GeV and charged hadrons with a transverse momentum of more than 2 GeV in Au+Au collisions at
s
N
N
=
200
GeV
that have been measured with the STAR detector at RHIC. The separation of correlations with direct photons and photons from hadronic decays will be discussed.
Event-by-event fluctuations at SPS Appelshäuser, Harald; Sako, Hiro; Adamová, D. ...
Nuclear physics. A,
04/2005, Volume:
752
Journal Article
Peer reviewed
Open access
Results on event-by-event fluctuations of the mean transverse momentum and net charge in Pb-Au collisions, measured by the CERES Collaboration at CERN-SPS, are presented. We discuss the centrality ...and beam energy dependence and compare our data to cascade calculations.
The STAR Level-3 trigger system Adler, C.; Berger, J.; Demello, M. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
03/2003, Volume:
499, Issue:
2
Journal Article
Peer reviewed
Open access
The STAR Level-3 trigger issues a trigger decision upon a complete online reconstruction of Au+Au collisions at relativistic heavy ion collider energies. Central interactions are processed up to a ...rate of
50
s
−1
including a simple analysis of physics observables. The setup of the processor farm and the event reconstruction as well as experiences and the proposed trigger algorithms are described.
Das Ivy Sign – Muss man das kennen? Dietel, T.; Bacher, M.; Bast, T. ...
Zeitschrift für Epileptologie,
08/2016, Volume:
29, Issue:
3
Journal Article
Peer reviewed
Zusammenfassung
Eine leptomeningeale Kontrastmittelanreicherung in T1-gewichteten MRT-Sequenzen bei Kindern mit einer Moya-Moya-Erkrankung wurde erstmals 1995 beschrieben. Als strukturelles Korrelat ...wurde ein ausgedehntes arterielles Netzwerk kollateraler Gefäße im Bereich der Pia mater angenommen. Nach dem Bild eines auf dem Stein wachsenden Efeus benannte die Gruppe dieses Phänomen Ivy Sign. Vier Jahre später wurde der Begriff für Signalanhebungen im Bereich der Leptomeninx in FLAIR-Sequenzen im Zusammenhang mit der Moya-Moya-Erkrankung eingeführt. In den folgenden Jahren wurde umfangreich über Signalanhebungen in FLAIR-Sequenzen peripherer und zentraler Liquorräume berichtet. Unabhängig von Gefäßerkrankungen gibt es dafür weitere pathologische Ursachen, die von physiologischen Phänomenen und artifiziellen Störungen abgegrenzt werden müssen.
Differential triangular flow, v3(pT), of negative pions is measured at sNN=17.3 GeV around midrapidity by the CERES/NA45 experiment at CERN in central PbAu collisions in the range 0–30% with a mean ...centrality of 5.5%. This is the first measurement as a function of transverse momentum of the triangular flow at SPS energies. The pT range extends from about 0.05 GeV/c to more than 2 GeV/c. The triangular flow magnitude, corrected for the HBT effects, is smaller by a factor of about 2 than the one measured by the PHENIX experiment at RHIC and the ALICE experiment at the LHC. Within the analyzed range of central collisions no significant centrality dependence is observed. The data are found to be well described by a viscous hydrodynamic calculation combined with an UrQMD cascade model for the late stages.
We report on first measurements of low-mass electron-positron pairs in Pb-Au collisions at the CERN SPS beam energy of 40 AGeV. The observed pair yield integrated over the range of invariant masses ...0.2<m</=1 GeV/c(2) is enhanced over the expectation from neutral meson decays by a factor of 5.9+/-1.5(stat)+/-1.2(syst data)+/-1.8(syst meson decays), somewhat larger than previously observed at the higher energy of 158 AGeV. The results are discussed with reference to model calculations based on pi(+)pi(-)-->e(+)e(-) annihilation with a modified rho propagator. They may be linked to chiral symmetry restoration and support the notion that the in-medium modifications of the rho are more driven by baryon density than by temperature.
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