A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Multiplicity dependence of charged-particle intra-jet properties in pp collisions at √s= 13 TeV (2024)

ALICE Collaboration. (2024). Multiplicity dependence of charged-particle intra-jet properties in pp collisions at √s= 13 TeV. European Physical Journal C, 84, Article 1079. https://doi.org/10.1140/epjc/s10052-024-13228-0

JYU-tekijät tai -toimittajat

Hassan, Hadi
Huhta, Laura
Kim, Dong
Molander, Andreas
Mordasini, Cindy
Rytkönen, Heidi
Räsänen, Sami
Saarimäki, Oskari
Trzaska, Wladyslaw
Virta, Maxim
Önnerstad, Anna

Julkaisun tiedot

Julkaisun kaikki tekijät tai toimittajat: ALICE Collaboration

Lehti tai sarja: European Physical Journal C

ISSN: 1434-6044

eISSN: 1434-6052

Julkaisuvuosi: 2024

Ilmestymispäivä: 17.10.2024

Volyymi: 84

Artikkelinumero: 1079

Kustantaja: Springer Nature

Julkaisumaa: Saksa

Julkaisun kieli: englanti

DOI: https://doi.org/10.1140/epjc/s10052-024-13228-0

Julkaisun avoin saatavuus: Avoimesti saatavilla

Julkaisukanavan avoin saatavuus: Kokonaan avoin julkaisukanava

Julkaisu on rinnakkaistallennettu (JYX): https://jyx.jyu.fi/handle/123456789/98279

Rinnakkaistallenteen verkko-osoite (pre-print):  https://doi.org/10.48550/arXiv.2311.13322

Tiivistelmä

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 √s = 13 TeV using the ALICE detector. Jets are reconstructed from charged particles produced in the midrapidity region (|η|<0.9) using the sequential recombination anti-kT algorithm with jet resolution parameters R = 0.2, 0.3, and 0.4 for the transverse momentum (pT) interval 5−110 GeV/c. 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 pT in qualitative agreement with previous measurements at lower energies. The distributions of jet fragmentation functions zch and ξch are measured for different jet-pT intervals. Jet-pT independent fragmentation of leading jets is observed for wider jets except at high- and low-zch. The observed "hump-backed plateau" structure in the ξch distribution indicates suppression of low-pT particles. In high-multiplicity events, an enhancement of the fragmentation probability of low-zch particles accompanied by a suppression of high-zch particles is observed compared to minimum-bias events. This behavior becomes more prominent for low-pT 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 pT. These measurements provide important constraints to models of jet fragmentation.

YSO-asiasanat: hiukkasfysiikka; ydinfysiikka

Liittyvät organisaatiot

Hankkeet, joissa julkaisu on tehty

OKM-raportointi: Kyllä

VIRTA-lähetysvuosi: 2024

Alustava JUFO-taso: 2