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Dielectron production at midrapidity at low transverse momentum in peripheral and semi-peripheral Pb-Pb collisions at root s(NN)=5.02 TeV

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F23%3A00367693" target="_blank" >RIV/68407700:21340/23:00367693 - isvavai.cz</a>

  • Result on the web

    <a href="https://doi.org/10.1007/JHEP06(2023)024" target="_blank" >https://doi.org/10.1007/JHEP06(2023)024</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1007/JHEP06(2023)024" target="_blank" >10.1007/JHEP06(2023)024</a>

Alternative languages

  • Result language

    angličtina

  • Original language name

    Dielectron production at midrapidity at low transverse momentum in peripheral and semi-peripheral Pb-Pb collisions at root s(NN)=5.02 TeV

  • Original language description

    The first measurement of the e(+)e(-) pair production at low lepton pair transverse momentum (p(T,ee)) and low invariant mass (m(ee)) in non-central Pb-Pb collisions at root s(NN) = 5.02TeV at the LHC is presented. The dielectron production is studied with the ALICE detector at midrapidity (vertical bar eta(e)vertical bar < 0.8) as a function of invariant mass (0.4 <= m(ee) < 2.7 GeV/c(2)) in the 50-70% and 70-90% centrality classes for p(T,ee) < 0.1 GeV/c, and as a function of p(T,ee) in three m(ee) intervals in the most peripheral Pb-Pb collisions. Below a p(T,ee) of 0.1 GeV/c, a clear excess of e(+)e(-) pairs is found compared to the expectations from known hadronic sources and predictions of thermal radiation from the medium. The m(ee) excess spectra are reproduced, within uncertainties, by different predictions of the photon-photon production of dielectrons, where the photons originate from the extremely strong electromagnetic fields generated by the highly Lorentz-contracted Pb nuclei. Lowest-order quantum electrodynamic (QED) calculations, as well as a model that takes into account the impact-parameter dependence of the average transverse momentum of the photons, also provide a good description of the p(T,ee) spectra. The measured root < p(T,ee)(2)> of the excess p(T,ee) spectrum in peripheral Pb-Pb collisions is found to be comparable to the values observed previously at RHIC in a similar phase-space region.

  • Czech name

  • Czech description

Classification

  • Type

    J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database

  • CEP classification

  • OECD FORD branch

    10301 - Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)

Result continuities

  • Project

    <a href="/en/project/LM2018104" target="_blank" >LM2018104: Research Infrastructure for experiments at CERN</a><br>

  • Continuities

    P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Others

  • Publication year

    2023

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Journal of High Energy Physics

  • ISSN

    1029-8479

  • e-ISSN

    1029-8479

  • Volume of the periodical

    2023

  • Issue of the periodical within the volume

    6

  • Country of publishing house

    DE - GERMANY

  • Number of pages

    32

  • Pages from-to

  • UT code for WoS article

    001023417500001

  • EID of the result in the Scopus database

    2-s2.0-85163101135