Perturbative description of particle spectra at LEP-1.5

Хозе, В. А.; Lupia, S.; Ochs, Wolfgang

doi:10.1016/0370-2693(96)00922-7

Cited by 25 publications

(57 citation statements)

References 30 publications

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“…Errors on the average multiplicity data points include both statistical and systematic errors. Results at LEP and LEP-1.5 cms energies from [15].…”

Section: A1 Moments In the General Casementioning

confidence: 99%

“…An explicit analytical expression for the particle energy distribution is found in this approximation for the special case Q 0 = Λ, the so-called limiting spectrum [3]. Remarkably, the experimental momentum spectra in the PETRA [10] and LEP [11] energy range gave support to the perturbative predictions [3], and this success has been continued recently to the higher energies at LEP-1.5 ( [12,13,14] and [15]) and the TEVATRON [16].…”

Section: Introductionmentioning

confidence: 97%

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Low and high energy limits of particle spectra in QCD jets

Lupia¹,

Ochs²

1998

Eur. Phys. J. C

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Charged particle energy spectra in e + e − annihilation are compared with the analytical predictions from the QCD evolution equation in the Modified Leading Log Approximation. With the nonperturbative initial condition shifted down to threshold as suggested by the Local Parton Hadron Duality picture a good description of the data from the lowest up to highest available energies results. The two essential parameters in this approach are determined from a moment analysis. The sensitivity of the fit to the running of α s and to the number of active flavours (including a light gluino) is demonstrated. For very high energies the theory predicts a scaling behaviour in certain rescaled variables ("ζ-scaling"). The data show an approximate behaviour of this type in the present energy range and come close to the predicted asymptotic scaling function for the small particle energies.

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“…Errors on the average multiplicity data points include both statistical and systematic errors. Results at LEP and LEP-1.5 cms energies from [15].…”

Section: A1 Moments In the General Casementioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Low and high energy limits of particle spectra in QCD jets

Lupia¹,

Ochs²

1998

Eur. Phys. J. C

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“…Such a scenario is deeply rooted in the space-time picture of the parton-cascade development and hadronization, see [1,4]. This approach has been developed and tested in details for the hadronic final states in e + e − annihilation verifying, in particular, the energy independence of the soft limit and the expected dependence on the primary colour charges (quark or gluon jets), but it should also be applicable to other hard processes including ep and pp (pp) collisions with high p T particle production, where the soft particles belong to the "underlying event" [5] - [7]. A distinct dependence on the primary colour charges makes this approach quite different from the simple process-independent universality, for example, of a thermodynamical origin.…”

Section: Introductionmentioning

confidence: 99%

Limiting soft particle emission in e + e −, hadronic and nuclear collisions

2010

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In e + e − collisions the particle spectra at low momenta reflect the properties of the underlying "soft" QCD gluon bremsstrahlung: the particle density, in the limit p → 0, becomes independent of the incoming energy √ s and directly proportional to the colour factors C A , C F for primary gluons or quarks respectively. We find that experimental data from the pp and nuclear reactions reveal the same behaviour: in the limit p T → 0 the invariant particle spectra become independent of the collision energy, and their intensities in e + e − , pp and nuclear reactions are compatible with the expected colour factors C F : C A : (N part /2)C A for N part nucleons, participating in the interaction. Coherent soft gluon bremsstrahlung is, therefore, suggested to be the dominant QCD mechanism for the soft particle production in all these reactions. These "soft" particles probe the very early stage of hadron formation in the collision. Future measurements at the LHC will provide crucial tests on the contributions from possible incoherent multi-component processes.

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“…To connect predictions at the parton level to experimental hadron-level data, LPHD [6] was assumed, which leaves only one free parameter -the hadronisation constant, K h describing connection between parton and hadron spectra. The conversion from energy to momentum spectra for the final-state hadrons is performed assuming an effective hadron mass, m eff = Q 0 [7].…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Scaled Momentum Spectra in Deep Inelastic Scattering at Hera

Brzozowska¹

2010

Particle Physics at the Year of Astronomy

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Charged particle production has been studied in deep inelastic scattering (DIS) using an integrated luminosity of about 0.44 fb −1 taken with the ZEUS detector at HERA. The fragmentation properties of the struck quark in deep inelastic scattering have been investigated in the current fragmentation region of the Breit frame as a function of the exchanged boson virtuality Q 2 . The measured evolution of scaled momentum distributions are compared to next-to-leading order calculations convoluted with the fragmentation functions obtained from e + e − experiments. Scaling violations are observed. The scaled momentum spectra are also compared to predictions based on a modified leading-logarithmic QCD approximation and Monte Carlo event generators.

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Perturbative description of particle spectra at LEP-1.5

Abstract: The recent data from LEP-1.5 on charged particle spectra are analyzed within the analytical QCD approach.Comment: LaTeX, 14 pages with 2 Postscript figures, uses epsfig.st

Cited by 25 publications

References 30 publications

Low and high energy limits of particle spectra in QCD jets

Low and high energy limits of particle spectra in QCD jets

Limiting soft particle emission in e + e −, hadronic and nuclear collisions

Scaled Momentum Spectra in Deep Inelastic Scattering at Hera

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