17 Ekim 2024 Dergi makalesi Açık Erişim

CERN İşbirliği

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    "description": "<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>", 
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      "issue": "10", 
      "title": "European Physical Journal C", 
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    "publication_date": "2024-10-17", 
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    "science_branches": [
      "Temel Bilimler > Fizik"
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    "title": "Multiplicity dependence of charged-particle intra-jet properties in pp collisions at     $\\sqrt{s}$   = 13 TeV"
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