Mainz 2022 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 45: Heavy-Ion Collisions and QCD Phases IX
HK 45.2: Vortrag
Mittwoch, 30. März 2022, 16:30–16:45, HK-H1
Dielectron physics opportunities with ALICE 3 — •Florian Eisenhut for the ALICE collaboration — Goethe University Frankfurt am Main
ALICE 3 is a compact, next-generation multipurpose detector at the LHC planed as a follow-up to the present ALICE experiment. It will provide unprecedented tracking, particle identification and vertexing capabilities down to a few tens of MeV/c with a large rapidity coverage |η|<4. At very low pT and invariant mass (mee) the thermal dielectron production rate in heavy-ion (AA) collisions is expected to be particularly sensitive to the electric conductivity of the medium. At higher dielectron invariant masses, the spectral shape of thermal radiation from the hot hadron gas carries information about the chiral-symmetry restoration mechanisms, among those is the chiral mixing between ρ and a1 mesons. In the mass region 1.1 < mee < 2.7 GeV/c2 the spectrum of thermal dielectrons is dominated by dieletrons from the QGP which directly provides a mean to estimate the early temperature of the medium. Finally, an elliptic flow measurement as a function of mee and pair transverse momentum allows a study of the dynamic of the medium as a function of time.
This talk will present performance studies for dielectron analyses with ALICE 3. The procedure to determine expected uncertainties of the thermal e+e− spectra will be presented and a so-called prefilter technique to reduce the combinatoric background will be explained. Furthermore, feasibility studies of the early temperature of the medium via exponential fits of the invariant mass spectra will be shown.