Charged-particle multiplicities of quark and gluon jets in e+ e− annihilation at TRISTAN

Nakabayashi, K.; Yamauchi, M.; Abe, Kenji; Abe, Tomohiro; Adachi, I.; Adachi, K.; Akiyama, Masashi; Emi, K.; Enomoto, R.; Fujii, Hirofumi; Fujii, Keisuke; Fujii, T.; Fujimoto, J.; Fujiwara, N.; Hayashii, H.; Howell, B.; Ikeda, Hirokazu; Inoue, Y.; Itoh, R.; Itami, S.; Iwasaki, H.; Iwasaki, M.; Kaneyuki, K.; Kajikawa, R.; Kato, Seiya; Kawabata, S.; Kichimi, H.; Kobayashi, M.; Koltick, D.; Levine, I.; Miyabayashi, K.; Miyamoto, A.; Nagai, K.; Nakano, E.; Nitoh, O.; Noguchi, S.; Ochi, A.; Ochiai, F.; Ohishi, N.; Ohnishi, Y.; Ohshima, Yasuhiro; Okuno, Hiroshi; Okusawa, T.; Sugiyama, A.; Suzuki, Shingo; Takahashi, K.; Takahashi, T.; Tanimori, T.; Tauchi, T.; Teramoto, Y.; Tomoto, M.; Tsukamoto, T.; Uno, S.; Watanabe, Y.; Yamamoto, A.

doi:10.1016/s0370-2693(97)01191-x

Cited by 12 publications

(11 citation statements)

References 47 publications

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“…25, we consider the scaling of the average charged-particle multiplicity and that of charged Kaons and Lambda baryons from CM energies of 14 GeV to 200 GeV, obtained from measurements available at HEPDATA. Below the Z pole, the measurements we include mostly come from TASSO [100], though a few points on n Ch come from HRS (at 29 GeV [101]) and TOPAZ (at 57.8 GeV [102]). At the Z pole, the data come from the four LEP experiments [38,[51][52][53], with the latter extending also to energies above M Z [103][104][105][106][107][108].…”

Section: Energy Scalingmentioning

confidence: 99%

Tuning PYTHIA 8.1: the Monash 2013 tune

2014

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We present an updated set of parameters for the PYTHIA 8 event generator. We reevaluate the constraints imposed by LEP and SLD on hadronization, in particular with regard to heavy-quark fragmentation and strangeness production. For hadron collisions, we combine the updated fragmentation parameters with the new NNPDF2.3 LO PDF set. We use minimum-bias, Drell-Yan, and underlying-event data from the LHC to constrain the initial-state-radiation and multi-parton-interaction parameters, combined with data from SPS and the Tevatron to constrain the energy scaling. Several distributions show significant improvements with respect to the current defaults, for both ee and pp collisions, though we emphasize that interesting discrepancies remain in particular for strange particles and baryons. The updated parameters are available as an option starting from PYTHIA 8.185, by setting Tune:ee = 7 and Tune:pp = 14.

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Section: Energy Scalingmentioning

confidence: 99%

Tuning PYTHIA 8.1: the Monash 2013 tune

2014

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“…[21], the measurements are taken from Refs. [21][22][23][24] for the gluon multiplicity and from Refs. [25,26] and references therein for the quark multiplicity.…”

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confidence: 99%

Gluon- and Quark-Jet Multiplicities with NNNLO and NNLL Accuracy

2012

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We present a new approach to consider and include both the perturbative and the nonperturbative contributions to the multiplicities of gluon and quark jets. Thanks to this new method, we have included for the first time new contributions to these quantities obtaining next-to-next-to-leading-logarithmic resummed formulas. Our analytic expressions depend on two nonperturbative parameters with a clear and simple physical interpretation. A global fit of these two quantities shows how our results solve a long-standing discrepancy in the theoretical description of the data.

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“…[35]- [39] and those of average quark jet multiplicities in Refs. [36,40], which include 27 and 51 experimental data points, respectively. The results for n h (Q 2 0 ) g and n h (Q 2 0 ) q at Q 0 = 50 GeV together with the χ 2 dof values obtained in our LO + NNLL, N 3 LO approx + NNLL, and N 3 LO approx + NLO + NNLL fits are listed in Table 1.…”

Section: Discussionmentioning

confidence: 99%

Average gluon and quark jet multiplicities

Kotikov¹

2016

AIP Conference Proceedings

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Abstract. We show the results in [1,2] for computing the QCD contributions to the scale evolution of average gluon and quark jet multiplicities. The new results came due a recent progress in timelike small-x resummation obtained in the MS factorization scheme. They depend on two nonperturbative parameters with clear and simple physical interpretations. A global fit of these two quantities to all available experimental data sets demonstrates by its goodness how our results solve a longstandig problem of QCD. Including all the available theoretical input within our approach, α (5) s (M z ) = 0.1199 ± 0.0026 has been obtained in the MS scheme in an approximation equivalent to next-to-next-to-leading order enhanced by the resummations of ln x terms through the NNLL level and of ln Q 2 terms by the renormalization group. This result is in excellent agreement with the present world average.

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Charged-particle multiplicities of quark and gluon jets in e+ e− annihilation at TRISTAN

Cited by 12 publications

References 47 publications

Tuning PYTHIA 8.1: the Monash 2013 tune

Tuning PYTHIA 8.1: the Monash 2013 tune

Gluon- and Quark-Jet Multiplicities with NNNLO and NNLL Accuracy

Average gluon and quark jet multiplicities

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