17 Ekim 2024 Dergi makalesi Açık Erişim

CERN İşbirliği

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    <subfield code="a">&lt;p&gt;The first measurement of the multiplicity dependence of intra-jet properties of leading charged-particle jets in proton–proton (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 (    $|\eta |&amp;lt;0.9$  ) 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 5–110 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.&lt;/p&gt;</subfield>
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    <subfield code="a">CERN İşbirliği</subfield>
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    <subfield code="a">10.1140/epjc/s10052-024-13228-0</subfield>
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    <subfield code="a">Multiplicity dependence of charged-particle intra-jet properties in pp collisions at     $\sqrt{s}$   = 13 TeV</subfield>
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