1 Ocak 2020 Dergi makalesi Açık Erişim

CERN İşbirliği

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    "description": "<p>Measurements of K${}^{\u204e}\\left(892\\right)^{0}$ and $\\varphi \\left(1020\\right)$ resonance production in Pb\u2013Pb and pp collisions at $\\sqrt{{s}_{\\mathrm{NN}}}$ = 5.02 TeV with the ALICE detector at the Large Hadron Collider are reported. The resonances are measured at midrapidity ($|y|$ &lt; 0.5) via their hadronic decay channels and the transverse momentum (${p}_{T}$) distributions are obtained for various collision centrality classes up to ${p}_{T}$ = 20 GeV/c. The ${p}_{T}$-integrated yield ratio K${}^{\u204e}\\left(892\\right)^{0}$/K in Pb\u2013Pb collisions shows significant suppression relative to pp collisions and decreases towards more central collisions. In contrast, the $\\varphi \\left(1020\\right)$/K ratio does not show any suppression. Furthermore, the measured K${}^{\u204e}\\left(892\\right)^{0}$/K ratio in central Pb\u2013Pb collisions is significantly suppressed with respect to the expectations based on a thermal model calculation, while the $\\varphi \\left(1020\\right)$/K ratio agrees with the model prediction. These measurements are an experimental demonstration of rescattering of K${}^{\u204e}\\left(892\\right)^{0}$ decay products in the hadronic phase of the collisions. The K${}^{\u204e}\\left(892\\right)^{0}$/K yield ratios in Pb\u2013Pb and pp collisions are used to estimate the time duration between chemical and kinetic freeze-out, which is found to be \u223c 4\u20137 fm/c for central collisions. The ${p}_{T}$-differential ratios of K${}^{\u204e}\\left(892\\right)^{0}$/K, $\\varphi \\left(1020\\right)$/K, K${}^{\u204e}\\left(892\\right)^{0}$/\u03c0, $\\varphi \\left(1020\\right)$/\u03c0, p/K${}^{\u204e}\\left(892\\right)^{0}$ and p/$\\varphi \\left(1020\\right)$ are also presented for Pb\u2013Pb and pp collisions at $\\sqrt{{s}_{\\mathrm{NN}}}$ = 5.02 TeV. These ratios show that the rescattering effect is predominantly a low-${p}_{T}$ phenomenon.</p>", 
    "doi": "10.1016/j.physletb.2020.135225", 
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    "journal": {
      "title": "Physics Letters B", 
      "volume": "802 C"
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    "publication_date": "2020-01-01", 
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    "title": "Evidence of rescattering effect in Pb\u2013Pb collisions at the LHC through production of K And (1020) Mesons"
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