Burckhart, H.J.
LN1/X
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rivet Analysis
Evolution of e p fragmentation and multiplicity distributions in the Breit frame.

The H1 collaboration Adloff, C. ; Aid, S. ; Anderson, M. ; et al.
Nucl.Phys.B 504 (1997) 3-23, 1997.
Inspire Record 445116 DOI 10.17182/hepdata.44587

Low x deep-inelastic ep scattering data, taken in 1994 at the H1 detector at HERA, are analysed in the Breit frame of reference. The evolution of the peak and width of the current hemisphere fragmentation function is presented as a function of Q and compared with e+e- results at equivalent centre of mass energies. Differences between the average charged multiplicity and the multiplicity of e+e- annihilations at low energies are analysed. Invariant energy spectra are compared with MLLA predictions. Distributions of multiplicity are presented as functions of Bjorken-x and Q^2, and KNO scaling is discussed.

25 data tables
Table 1

The current hemisphere fragmentation as a function of XP in the Breit frame.

Table 2

The current hemisphere fragmentation as a function of LN(1/XP) in the Breitframe.

Table 3

Current hemisphere fragmentation as a function of Q for the XP range 0.02 to 0.05, to show scaling violations.

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rivet Analysis
Measurement of multiplicity and momentum spectra in the current fragmentation region of the Breit frame at HERA

The ZEUS collaboration Derrick, M. ; Krakauer, D. ; Magill, S. ; et al.
Z.Phys.C 67 (1995) 93-108, 1995.
Inspire Record 392386 DOI 10.17182/hepdata.45051

Charged particle production has been measured in Deep Inelastic Scattering (DIS) events using the ZEUS detector over a large range of $Q~2$ from 10 to $1280 {\rm\ GeV}~2$. The evolution with $Q$ of the charged multiplicity and scaled momentum has been investigated in the current fragmentation region of the Breit frame. The data are used to study QCD \linebreak coherence effects in DIS and are compared with corresponding \eedata in order to test the universality of quark fragmentation.

16 data tables
Table 1

Mean charged multiplicity in the current fragmentation region.

Table 2

Mean charged multiplicity in the current fragmentation region.

Table 3

Mean charged multiplicity in the current fragmentation region.

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Production of charged particles, K0(s), K+-, p and Lambda in Z --> b anti-b events and in the decay of b hadrons

The DELPHI collaboration Abreu, P. ; Adam, W. ; Adye, T. ; et al.
Phys.Lett.B 347 (1995) 447-466, 1995.
Inspire Record 392257 DOI 10.17182/hepdata.48180

A sample of events enriched in bb̄ quark pairs was selected in the data recorded by the DELPHI experiment at LEP during 1992 and 1993, by the presence of secondary decay vertices from short-lived particles. Using this sample, the average multiplicities of K s 0 , K ± , p(p̄), Λ( Λ ) and of charged particles in bb̄ events have been measured, distinguishing the component from fragmentation and the component coming from the decay of b-hadrons. The measurement of the average charge multiplicity in bb̄ events was used to compute the mean fractional beam energy carried by the primary b-hadron, and the difference in charged particle multiplicity between bb̄ events and light quark (uū, dd̄, ss̄) events.

9 data tables
Table 1

Event multiplicity in bottom events.

Table 2

Differential cross section for charged particles in BOTTOM tagged hemispheres.

Table 3

Differential cross section for charged particles in untagged hemispheres.

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