The FEE Server Control Engine of the ALICE-TRD - Westfälische ...

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Temperature (MeV) 225 200 175 150 125 100 75 50 25 0 2 Theoretical background Early Universe RHIC Quark−gluon plasma (deconfined) CERN SPS Hadron gas (confined) AGS atomic nuclei 0 200 400 600 800 1,000 Chemical potential (MeV) Figure 2.1: Phase diagram of strongly interacting matter. The data points are obtained from experimental data measured at the three accelerators AGS, SPS (CERN) and RHIC, using a thermal fit model to calculate the temperature T and the chemical potential µ b at chemical freeze out. Filled circles are from analysis of mid-rapidity data, open circles from analysis of 4π data. Furthermore theoretical expectations for the phase boundary between confined and deconfined matter are shown. The dotted line is calculated with the bag model and the dashed/solid line is from lattice quantum chromodynamics calculations. The filled triangle indicates a possible position of a critical endpoint. The magenta line shows the evolution of the Universe in its first moments of existence. (Plot based on [ABMS06] and [BMS07]). 12 Figure 2.2: Simulation of two colliding lead nuclei at √ sNN = 160 GeV [Web07].
2 Theoretical background lifetime. Instead, the type of the created particles, their energies and their moving directions are recorded. These data are used to deduce properties of the QGP. 2.3 Signatures of the Quark-Gluon Plasma There is no single non-ambiguous observable for the formation of a QGP. However, different signatures of a QGP are predicted. Although they can be explained by other mechanisms as well, the QGP is the best explanation for the simultaneous observation of different signatures. This section gives a short overview about the most prominent signatures of a QGP. 2.3.1 J/ψ Suppression The J/ψ is a bound state of a charm and an anti-charm (cc) quark. Data for the production rate of J/ψ and other quarkonia states without the presence of a QGP can be obtained from proton-proton collisions or from collisions of light nuclei. In case of a QGP, the quarks are deconfined and move freely inside the plasma. At the time of re-hadronization it is very unlikely that the created c and c quarks are close together and hadronize to a J/ψ. Instead, they will be bound with the much more abundant (anti-)up, (anti-)down or (anti-)strange quarks to other hadrons. Therefore a suppression of the J/ψ production is expected (e.g. [MS86], [Sat90], [YHM05]). Figure 2.3: Measured J/ψ production yields, normalised to the yields expected assuming that the only source of suppression is the ordinary absorption by the nuclear medium [NA500]. 13
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7 Summary The ALICE detector. The A
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A Using the libTRD The C++ library
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B The SCSN Commands and Extended SC
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Block Class task Configuration hand
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Bibliography [A + 05] V. Angelov et
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Bibliography [Mah04] T. Mahmoud. De
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