1 Ocak 2019 Dergi makalesi Açık Erişim

CERN İşbirliği

Citation Style Language JSON

{
  "DOI": "10.1016/j.physletb.2019.05.028", 
  "abstract": "<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>", 
  "author": [
    {
      "family": "CERN \u0130\u015fbirli\u011fi"
    }
  ], 
  "container_title": "Physics Letters B", 
  "id": "105899", 
  "issued": {
    "date-parts": [
      [
        2019, 
        1, 
        1
      ]
    ]
  }, 
  "title": "Multiplicity dependence of (anti-)deuteron production in pp collisions at", 
  "type": "article-journal", 
  "volume": "794 C"
}