17 Ekim 2024 Dergi makalesi Açık Erişim

CERN İşbirliği

Citation Style Language JSON

{
  "DOI": "10.1140/epjc/s10052-024-13228-0", 
  "abstract": "<p>The first measurement of the multiplicity dependence of intra-jet properties of leading charged-particle jets in proton\u2013proton (pp) collisions is reported. The mean charged-particle multiplicity and jet fragmentation distributions are measured in minimum-bias and high-multiplicity pp collisions at center-of-mass energy     $\\sqrt{s}$   = 13 TeV using the ALICE detector. Jets are reconstructed from charged particles produced in the midrapidity region (    $|\\eta |&lt;0.9$  ) using the sequential recombination anti-    ${k}_{\\text{T}}$   algorithm with jet resolution parameters R = 0.2, 0.3, and 0.4 for the transverse momentum (    ${p}_{\\text{T}}$  ) interval 5\u2013110 GeV/c. The high-multiplicity events are selected by the forward V0 scintillator detectors. The mean charged-particle multiplicity inside the leading jet cone rises monotonically with increasing jet     ${p}_{\\text{T}}$   in qualitative agreement with previous measurements at lower energies. The distributions of jet fragmentation function variables     ${z}^{\\text{ch}}$   and     ${\\xi }^{\\text{ch}}$   are measured for different jet-    ${p}_{\\text{T}}$   intervals. Jet-    ${p}_{\\text{T}}$   independent fragmentation of leading jets is observed for wider jets except at high- and low-    ${z}^{\\text{ch}}$   values. The observed \"hump-backed plateau\" structure in the     ${\\xi }^{\\text{ch}}$   distribution indicates suppression of low-    ${p}_{\\text{T}}$   particles. In high-multiplicity events, an enhancement of the fragmentation probability of low-    ${z}^{\\text{ch}}$   particles accompanied by a suppression of high-    ${z}^{\\text{ch}}$   particles is observed compared to minimum-bias events. This behavior becomes more prominent for low-    ${p}_{\\text{T}}$   jets with larger jet radius. The results are compared with predictions of QCD-inspired event generators, PYTHIA 8 with Monash 2013 tune and EPOS LHC. It is found that PYTHIA 8 qualitatively reproduces the jet modification in high-multiplicity events except at high jet     ${p}_{\\text{T}}$  . These measurements provide important constraints to models of jet fragmentation.</p>", 
  "author": [
    {
      "family": "CERN \u0130\u015fbirli\u011fi"
    }
  ], 
  "container_title": "European Physical Journal C", 
  "id": "274647", 
  "issue": "10", 
  "issued": {
    "date-parts": [
      [
        2024, 
        10, 
        17
      ]
    ]
  }, 
  "title": "Multiplicity dependence of charged-particle intra-jet properties in pp collisions at     $\\sqrt{s}$   = 13 TeV", 
  "type": "article-journal", 
  "volume": "84"
}