1 Ocak 2019 Dergi makalesi Açık Erişim

CERN İşbirliği

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    "description": "<p>In this letter, the production of deuterons and anti-deuterons in pp collisions at $\\sqrt{s}=7$ TeV is studied as a function of the charged-particle multiplicity density at mid-rapidity with the ALICE detector at the LHC. Production yields are measured at mid-rapidity in five multiplicity classes and as a function of the deuteron transverse momentum (${p}_{T}$). The measurements are discussed in the context of hadron\u2013coalescence models. The coalescence parameter ${B}_{2}$, extracted from the measured spectra of (anti-)deuterons and primary (anti-)protons, exhibits no significant ${p}_{T}$-dependence for ${p}_{T}&lt;3$ $\\text{GeV}\\phantom{\\rule{-0.05em}{0ex}}/\\phantom{\\rule{-0.02em}{0ex}}c$, in agreement with the expectations of a simple coalescence picture. At fixed transverse momentum per nucleon, the ${B}_{2}$ parameter is found to decrease smoothly from low multiplicity pp to Pb\u2013Pb collisions, in qualitative agreement with more elaborate coalescence models. The measured mean transverse momentum of (anti-)deuterons in pp is not reproduced by the Blast-Wave model calculations that simultaneously describe pion, kaon and proton spectra, in contrast to central Pb\u2013Pb collisions. The ratio between the ${p}_{T}$-integrated yield of deuterons to protons, d/p, is found to increase with the charged-particle multiplicity, as observed in inelastic pp collisions at different centre-of-mass energies. The d/p ratios are reported in a wide range, from the lowest to the highest multiplicity values measured in pp collisions at the LHC.</p>", 
    "doi": "10.1016/j.physletb.2019.05.028", 
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      "title": "Physics Letters B", 
      "volume": "794 C"
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    "title": "Multiplicity dependence of (anti-)deuteron production in pp collisions at"
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