Measurement of neutral mesons in pp and Pb-Pb collisions at mid-rapidity with ALICE

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• 作者：Astrid Morreale ; on behalf of the ALICE collaboration
• 关键词：jet quenching ; energy loss ; NLO pQCD ; CGC ; QGP ; particle ratios
• 刊名：Nuclear Physics A
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：956
• 期：Complete
• 页码：645-648
• 全文大小：244 K

文摘

One of the key signatures of the Quark-Gluon Plasma (QGP), is the modification of hadron transverse momentum differential cross-sections in heavy-ion collisions (HIC) as compared to proton-proton (pp) collisions. Suppression of hadron production at high transverse momenta (p_T$p_{\mathrm{T}}$) in HIC has been explained by the energy loss of the partons produced in the hard scattering processes which traverse the deconfined quantum chromodynamic (QCD) matter. The dependence of the observed suppression on the p_T$p_{\mathrm{T}}$ of the measured hadron towards higher p_T$p_{\mathrm{T}}$ is an important input for the theoretical understanding of jet quenching effects in the QGP and the nature of the energy loss. The ALICE experiment at the Large Hadron Collider (LHC) performs measurements of neutral meson inclusive spectra at mid-rapidity in a wide p_T$p_{\mathrm{T}}$ range in pp, p  -Pb and Pb-Pb collisions. Neutral mesons (π⁰,η,ω${\pi }^0,\eta ,\omega$) are reconstructed via complementary methods, using the ALICE electromagnetic calorimeters, PHOS and EMCal, and by the central tracking system, identifying photons converted into e⁺e⁻$e^{+}{e}^{-}$ pairs in the material of the inner barrel detectors (TPC and ITS).