Multiplicities of π0, η, K0 and of charged particles in quark and gluon jets

Physics

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https://doi.org/10.1007/s100520000505
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Multiplicities of π0, η, K0 and of charged particles in quark and gluon jets. / OPAL Collaboration.
In: European Physical Journal C: Particles and Fields, Vol. 17, No. 3, 11.2000, p. 373-387.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

OPAL Collaboration 2000, 'Multiplicities of π0, η, K0 and of charged particles in quark and gluon jets', European Physical Journal C: Particles and Fields, vol. 17, no. 3, pp. 373-387. https://doi.org/10.1007/s100520000505

APA

OPAL Collaboration (2000). Multiplicities of π0, η, K0 and of charged particles in quark and gluon jets. European Physical Journal C: Particles and Fields, 17(3), 373-387. https://doi.org/10.1007/s100520000505

Vancouver

OPAL Collaboration. Multiplicities of π0, η, K0 and of charged particles in quark and gluon jets. European Physical Journal C: Particles and Fields. 2000 Nov;17(3):373-387. doi: 10.1007/s100520000505

Author

OPAL Collaboration. / Multiplicities of π0, η, K0 and of charged particles in quark and gluon jets. In: European Physical Journal C: Particles and Fields. 2000 ; Vol. 17, No. 3. pp. 373-387.

Bibtex

@article{1fbf444d194844c08b360660e04e702d,

title = "Multiplicities of π0, η, K0 and of charged particles in quark and gluon jets",

abstract = "We compared the multiplicities of π0, η, K0 and of charged particles in quark and gluon jets in 3-jet events, as measured by the OPAL experiment at LEP. The comparisons were performed for distributions unfolded to 100% pure quark and gluon jets, at an effective scale Qjet which took into account topological dependences of the 3-jet environment. The ratio of particle multiplicity in gluon jets to that in quark jets as a function of Qjet for π0, η or K0 was found to be independent of the particle species. This is consistent with the QCD prediction that the observed enhancement in the mean particle rate in gluon jets with respect to quark jets should be independent of particle species. In contrast to some theoretical predictions and previous observations, we observed no evidence for an enhancement of η meson production in gluon jets with respect to quark jets, beyond that observed for charged particles. We measured the ratio of the slope of the average charged particle multiplicity in gluon jets to that in quark jets, C, and we compared it to a next-to-next-to-next-to leading order calculation. Our result, C=2.27±0.20(stat.+syst.), is about one standard deviation higher than the perturbative prediction.",

author = "Vakhtang Kartvelishvili and {OPAL Collaboration}",

year = "2000",

month = nov,

doi = "10.1007/s100520000505",

language = "English",

volume = "17",

pages = "373--387",

journal = "European Physical Journal C: Particles and Fields",

issn = "1434-6044",

publisher = "SPRINGER",

number = "3",

}

RIS

TY - JOUR

T1 - Multiplicities of π0, η, K0 and of charged particles in quark and gluon jets

AU - Kartvelishvili, Vakhtang

AU - OPAL Collaboration

PY - 2000/11

Y1 - 2000/11

N2 - We compared the multiplicities of π0, η, K0 and of charged particles in quark and gluon jets in 3-jet events, as measured by the OPAL experiment at LEP. The comparisons were performed for distributions unfolded to 100% pure quark and gluon jets, at an effective scale Qjet which took into account topological dependences of the 3-jet environment. The ratio of particle multiplicity in gluon jets to that in quark jets as a function of Qjet for π0, η or K0 was found to be independent of the particle species. This is consistent with the QCD prediction that the observed enhancement in the mean particle rate in gluon jets with respect to quark jets should be independent of particle species. In contrast to some theoretical predictions and previous observations, we observed no evidence for an enhancement of η meson production in gluon jets with respect to quark jets, beyond that observed for charged particles. We measured the ratio of the slope of the average charged particle multiplicity in gluon jets to that in quark jets, C, and we compared it to a next-to-next-to-next-to leading order calculation. Our result, C=2.27±0.20(stat.+syst.), is about one standard deviation higher than the perturbative prediction.

AB - We compared the multiplicities of π0, η, K0 and of charged particles in quark and gluon jets in 3-jet events, as measured by the OPAL experiment at LEP. The comparisons were performed for distributions unfolded to 100% pure quark and gluon jets, at an effective scale Qjet which took into account topological dependences of the 3-jet environment. The ratio of particle multiplicity in gluon jets to that in quark jets as a function of Qjet for π0, η or K0 was found to be independent of the particle species. This is consistent with the QCD prediction that the observed enhancement in the mean particle rate in gluon jets with respect to quark jets should be independent of particle species. In contrast to some theoretical predictions and previous observations, we observed no evidence for an enhancement of η meson production in gluon jets with respect to quark jets, beyond that observed for charged particles. We measured the ratio of the slope of the average charged particle multiplicity in gluon jets to that in quark jets, C, and we compared it to a next-to-next-to-next-to leading order calculation. Our result, C=2.27±0.20(stat.+syst.), is about one standard deviation higher than the perturbative prediction.

U2 - 10.1007/s100520000505

DO - 10.1007/s100520000505

M3 - Journal article

VL - 17

SP - 373

EP - 387

JO - European Physical Journal C: Particles and Fields

JF - European Physical Journal C: Particles and Fields

SN - 1434-6044

IS - 3

ER -

Research

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