Charged particle multiplicity distributions in restricted rapidity intervals in Z0 hadronic decays.

The multiplicity distributions of charged particles in restricted rapidity intervals inZ0 hadronic decays measured by the DELPHI detector are presented. The data reveal a shoulder structure, best visible for intervals of intermediate size, i.e. for rapidity limits around ±1.5. The whole set of distributions including the shoulder structure is reproduced by the Lund Parton Shower model. The structure is found to be due to important contributions from 3-and 4-jet events with a hard gluon jet. A different model, based on the concept of independently produced groups of particles, “clans”, fluctuating both in number per event and particle content per clan, has also been used to analyse the present data. The results show that for each interval of rapidity the average number of clans per event is approximately the same as at lower energies.

electron positron: colliding beams
colliding beams: electron positron
electron positron: annihilation
annihilation: electron positron
Z0: electroproduction
electroproduction: Z0
Z0: nonleptonic decay
nonleptonic decay: Z0
jet: multiple production
multiple production: jet

References(32)

Figures(0)

Charged particle multiplicity distributions in Z0 hadronic decays

DELPHI

Collaboration

•

P. Abreu

et al.

- Z.Phys.C 50 (1991) 185-194
•
DOI:
- 10.1007/BF01474073

Coherent Parton Showers Versus Matrix Elements: Implications of PETRA - PEP Data

- Phys.Lett.B 185 (1987) 435
•
DOI:
- 10.1016/0370-2693(87)91031-8

The Lund Monte Carlo for Jet Fragmentation

Torbjorn Sjostrand
(
- Lund U., Dept. Theor. Phys.
)

- Comput.Phys.Commun. 27 (1982) 243,
- Comput. Phys. Commun. 27 ( 1982) 243-284 and Lund Univ. - LU TP 82-03 (82,REC.MAY) 74p
•
DOI:
- 10.1016/0010-4655(82)90175-8

The Lund Monte Carlo for e+ e- Jet Physics

Torbjorn Sjostrand
(
- Lund U., Dept. Theor. Phys.
)

- Comput.Phys.Commun. 28 (1983) 229,
- Comput. Phys. Commun. 28 ( 1983) 229-254 and Lund Univ. - LU TP 82-07 (82,REC.JUL.) 42p
•
DOI:
- 10.1016/0010-4655(83)90041-3

The Lund Monte Carlo for Jet Fragmentation and e+ e- Physics. Jetset Version 6.3: An Update

- Comput.Phys.Commun. 43 (1987) 367
•
DOI:
- 10.1016/0010-4655(87)90054-3

Negative Binomial Multiplicity Distributions in High-Energy Hadron Collisions

Alberto Giovannini
(
- Turin U. and
- INFN, Turin
)
,
L. Van Hove
(
- CERN
)

- Z.Phys.C 30 (1986) 391,
•
DOI:
- 10.1007/BF01557602

Negative Binomial Multiplicity Distributions in Continuous Domains

L. Van Hove
(
- CERN
)

- Physica A 147 (1987) 19
•
DOI:
- 10.1016/0378-4371(87)90094-X

The DELPHI detector at LEP

DELPHI

Collaboration

•

P.A. Aarnio

et al.

- Nucl.Instrum.Meth.A 303 (1991) 233-276
•
DOI:
- 10.1016/0168-9002(91)90793-P

Scaling of multiplicity distributions in high-energy hadron collisions

- Nucl.Phys.B 40 (1972) 317-334
•
DOI:
- 10.1016/0550-3213(72)90551-2

Experimental Studies on Multi-Jet Production in e+ e- Annihilation at PETRA Energies

JADE

Collaboration

•

W. Bartel
(
- DESY
)

et al.

- Z.Phys.C 33 (1986) 23,
•
DOI:
- 10.1007/BF01410449

Experimental Investigation of the Energy Dependence of the Strong Coupling Strength

JADE

Collaboration

•

S. Bethke
(
- Heidelberg U.
)

et al.

- Phys.Lett.B 213 (1988) 235-241
•
DOI:
- 10.1016/0370-2693(88)91032-5

Determination of $\alpha^- s$ From a Differential Jet Multiplicity Distribution at {SLC} and {PEP}

et al.

- Phys.Rev.Lett. 64 (1990) 987,
- Phys. Rev. Lett. 64 (1990) 987-990 and SLAC Stanford - SLAC-PUB-5137 (89,rec.Feb.90) 15 p
•
DOI:
- 10.1103/PhysRevLett.64.987