Global jet properties at 14?44 GeV center of mass energy ine + e ? annihilation

Braunschweig, W.; Gerhards, R.; Kirschfink, F. J.; Martyn, H. U.; Fischer, H. M.; Hartmann, H.; Hartmann, J.; Hilger, E.; Jocksch, A.; Wedemeyer, R.; Foster, B.; Martín, A.; Bernardi, Elisabetta De; Chwastowski, J. J.; Eskreys, A.; Genser, K.; Hultschig, H.; Joos, P.; Kowalski, H.; Ladage, A.; Löhr, B.; Lüke, D.; Mättig, P.; Notz, D.; Pawlak, J. M.; Pösnecker, K. U.; Ros, E.; Trines, D.; Walczak, R.; Wolf, G.; Kolanoski, H.; Krüger, J.; Lohrmann, E.; Poelz, G.; Zeuner, Wolfram Dietrich; Hassard, J. F.; Shulman, J.; Su, D.; Tomalin, I. R.; Barreiro, F.; Cases, G.; Hervás, L.; Peso, J. Del; Bowler, M. G.; Burrows, P.N.; Cashmore, R. J.; Veitch, M. E.; Hart, J. C.; Saxon, D. H.; Brandt, Siegmund; Holder, M.; Eisenberg, Y.; Karshon, U.; Montag, A.; Revel, D.; Ronat, E.; Wainer, N.; Caldwell, A.; Müller, D. R.; Ritz, S.; Strom, D.; Takashima, M.; Wu, S. L.; Zobernig, G.

doi:10.1007/bf01552339

Cited by 152 publications

(49 citation statements)

References 38 publications

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“…By fitting all the measured e + e − jet distributions in the range of collision energies √ s ≈ 2-200 GeV [7,[24][25][26][27][28][29][30][31][32][33][34][35][35][36][37][38] a value of Λ QCD can be extracted which agrees very well with that obtained from the NLO coupling constant evaluated at the Z resonance, α s (m 2 Z ), in the minimal subtraction (MS) factorisation scheme [39][40][41]. Similar studies -at (N)MLLA+LO accuracy under different approximations, and with a more reduced experimental data-set-were done previously for various parametrizations of the input fragmentation function [42][43][44][45] but only with a relatively modest data-theory agreement, and an extracted LO value of Λ QCD with large uncertainties.…”

Section: Jhep08(2014)068mentioning

confidence: 99%

“…More concretely, we fit the experimental distributions to the expression: Each fit has five free parameters for the DG: maximum peak position, total multiplicity, width, skewness and kurtosis. In total, we analyse 32 data-sets from the following experiments: BES at √ s = 2-5 GeV [24]; TASSO at √ s = 14-44 GeV [25,26]; TPC at √ s = 29 GeV [27]; TOPAZ at √ s = 58 GeV [28]; ALEPH [29], L3 [30] and OPAL [7,31] at √ s = 91.2 GeV; ALEPH [32,35], DELPHI [33], OPAL [34] at √ s = 133 GeV; and ALEPH [35] and OPAL [36][37][38] in the range √ s = 161-202 GeV. The total number of points is 1019 and the systematic and statistical uncertainties of the spectra are added in quadrature.…”

Section: Jhep08(2014)068mentioning

confidence: 99%

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Energy evolution of the moments of the hadron distribution in QCD jets including NNLL resummation and NLO running-coupling corrections

Pérez-Ramos

d’Enterria

2014

J. High Energ. Phys.

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The moments of the single inclusive momentum distribution of hadrons in QCD jets, are studied in the next-to-modified-leading-log approximation (NMLLA) including next-to-leading-order (NLO) corrections to the α s strong coupling. The evolution equations are solved using a distorted Gaussian parametrisation, which successfully reproduces the spectrum of charged hadrons of jets measured in e + e − collisions. The energy dependencies of the maximum peak, multiplicity, width, kurtosis and skewness of the jet hadron distribution are computed analytically. Comparisons of all the existing jet data measured in e + e − collisions in the range √ s ≈ 2-200 GeV to the NMLLA+NLO * predictions allow one to extract a value of the QCD parameter Λ QCD , and associated two-loop coupling constant at the Z resonance α s (m 2 Z ) = 0.1195 ± 0.0022, in excellent numerical agreement with the current world average obtained using other methods.

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Section: Jhep08(2014)068mentioning

confidence: 99%

Section: Jhep08(2014)068mentioning

confidence: 99%

Energy evolution of the moments of the hadron distribution in QCD jets including NNLL resummation and NLO running-coupling corrections

Pérez-Ramos

d’Enterria

2014

J. High Energ. Phys.

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“…A simple and intuitive probabilistic approach of the partonic cascade produced in hadronic collisions emerges from this simple exercise [4]. Perhaps the most relevant experimental observation which confirms this phenomena is the suppression of the soft sector in the jet fragmentation function (the hump-backed plateau) [1][2][3]. The study of medium modifications to the branching process has been addressed recently in a series of papers [5][6][7][8] by considering the radiation pattern of a qq antenna immersed in a QCD medium.…”

Section: Introductionmentioning

confidence: 85%

“…Different observables such as jet shapes, intrajet activity and multiplicity have confirmed their relevance in high energy hadronic collisions [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Coherence effects between the initial and final state radiation in a dense QCD medium

Martínez

2014

Nuclear Physics A

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In these proceedings contribution we review our recent results of medium modifications to the coherence pattern between the initial and final state radiation. We study single gluon production off a highly energetic parton that undergoes a hard scattering and subsequently crosses a dense QCD medium of finite size. Multiple scatterings lead to a partial suppression of the interferences between different emitters that opens the phase space for large angle emissions. We briefly discuss the generalization of this setup to describe gluon production in the case of pA collisions by including finite length and energy corrections. The configuration studied here may have phenomenological consequences in high-energy nuclear collisions.

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“…First attempts for the latter using among others the rather limited data from TASSO [37,38] were recently presented in Ref. [39].…”

Section: Single-hadron Productionmentioning

confidence: 99%

Measurements of fragmentation functions and implications for semi-inclusive deep-inelastic scattering

Schnell¹

2018

Proceedings of QCD Evolution 2017 — PoS(QCDEV2017)

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In this talk we will briefly review the present status of fragmentation function measurements with a focus on the more recent measurements of Collins-function related as well as of polarizationaveraged single-and di-hadron fragmentation. We will further discuss limitations in the analysis of dihadron-fragmentation data arising through an incomplete integration of the differential cross section imposed by experimental constraints. In particular, we show that the usual application of momentum requirements together with integration over the polar angle of the hadrons in the di-hadron center-of-mass frame leads to a presently uncontrollable mix of various partialwave components of the di-hadron fragmentation function, prohibiting precision extractions of di-hadron fragmentation functions from e + e − annihilation, semi-inclusive deep-inelastic scattering, or proton-proton collision data.

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Global jet properties at 14?44 GeV center of mass energy ine + e ? annihilation

Cited by 152 publications

References 38 publications

Energy evolution of the moments of the hadron distribution in QCD jets including NNLL resummation and NLO running-coupling corrections

Energy evolution of the moments of the hadron distribution in QCD jets including NNLL resummation and NLO running-coupling corrections

Coherence effects between the initial and final state radiation in a dense QCD medium

Measurements of fragmentation functions and implications for semi-inclusive deep-inelastic scattering

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