Particle Distribution in Three Jet Events Produced by e+ e- Annihilation

We have studied the distribution of particles within and between jets of 3-jet final states produced in the reactione+e−→hadrons at c.m. energies of 22 GeV and 29–36.4 GeV. The lowest energy jet shows distributions of transverse momenta, particle flow, and energy flow which differ significantly from those of the other two jets and from jets of 2-jet events atEcm=14 GeV. First order QCD calculations with subsequent fragmentation of quarks and gluons into hadrons indicate that the lowest energy jet has the largest probability of originating from a gluon. To reproduce the observed differences in an independent parton fragmentation model, the secondary quarks of a gluon jet have to have higher transverse momenta and lower parallel momenta than those of a quark jet. The particle densities between the jets as well as the correlation of transverse and longitudinal momenta of the particles within the jets favour models with fragmentation along the colour axes.

ELECTRON POSITRON: COLLIDING BEAMS
COLLIDING BEAMS: ELECTRON POSITRON
ELECTRON POSITRON: ANNIHILATION
ANNIHILATION: ELECTRON POSITRON
JET: ELECTROPRODUCTION
ELECTROPRODUCTION: JET
HADRON: MULTIPLE PRODUCTION
MULTIPLE PRODUCTION: HADRON
FINAL STATE: (3JET)
(3JET): FINAL STATE

References(24)

Figures(0)

Observation of Planar Three Jet Events in e+ e- Annihilation and Evidence for Gluon Bremsstrahlung

JADE

Collaboration

•

W. Bartel
(
- DESY
)

et al.

- Phys.Lett.B 91 (1980) 142-147
•
DOI:
- 10.1016/0370-2693(80)90680-2

Discovery of Three Jet Events and a Test of Quantum Chromodynamics at PETRA Energies

et al.

- Phys.Rev.Lett. 43 (1979) 830
•
DOI:
- 10.1103/PhysRevLett.43.830

Evidence for Gluon Bremsstrahlung in e+ e- Annihilations at High-Energies

PLUTO

Collaboration

•

Christoph Berger
(
- Aachen, Tech. Hochsch.
)

et al.

- Phys.Lett.B 86 (1979) 418-425
•
DOI:
- 10.1016/0370-2693(79)90869-4

Evidence for Planar Events in e+ e- Annihilation at High-Energies

TASSO

Collaboration

•

R. Brandelik
(
- Aachen, Tech. Hochsch.
)

et al.

- Phys.Lett.B 86 (1979) 243-249
•
DOI:
- 10.1016/0370-2693(79)90830-X

Observation of Four - Jet Structure in $e^+ e^-$ Annihilation at $\sqrt{s}=33$ -{GeV}

JADE

Collaboration

•

W. Bartel
(
- DESY
)

et al.

- Phys.Lett.B 115 (1982) 338-344
•
DOI:
- 10.1016/0370-2693(82)90383-5

Jet Production by a Gluon Source in {QCD}

Martin B. Einhorn
(
- Michigan U. and
- SLAC
)
,
Bruce G. Weeks
(
- Michigan U.
)

- Nucl.Phys.B 146 (1978) 445-456
•
DOI:
- 10.1016/0550-3213(78)90077-9

Gluon Jets from Quantum Chromodynamics

K. Shizuya
(
- Fermilab
)
,
S.-H.H. Tye
(
- Fermilab
)

- Phys.Rev.Lett. 41 (1978) 787,
- Phys.Rev.Lett. 41 (1978) 1195 (erratum)
•
DOI:
- 10.1103/PhysRevLett.41.787

Experimental Study of Jets in electron - Positron Annihilation

JADE

Collaboration

•

W. Bartel
(
- DESY
)

et al.

- Phys.Lett.B 101 (1981) 129-134
•
DOI:
- 10.1016/0370-2693(81)90505-0

Experimental Evidence for Differences in $p_T$ Between Quark Jets and Gluon Jets

JADE

Collaboration

•

W. Bartel
(
- DESY
)

et al.

- Phys.Lett.B 123 (1983) 460-466
•
DOI:
- 10.1016/0370-2693(83)90994-2

Total Cross-Section for Hadron Production by e+ e- Annihilation at PETRA Energies

JADE

Collaboration

•

W. Bartel
(
- DESY
)

et al.

- Phys.Lett.B 88 (1979) 171-176
•
DOI:
- 10.1016/0370-2693(79)90139-4

Axes and Scalar Measures of Two-Jet and Three-Jet Events

S. Brandt
(
- Siegen U.
)
,
H.D. Dahmen
(
- Siegen U.
)

- Z.Phys.C 1 (1979) 61
•
DOI:
- 10.1007/BF01450381

A Method of Three Jet Analysis in e+ e- Annihilation

- Z.Phys.C 2 (1979) 107
•
DOI:
- 10.1007/BF01474124

- Phys.Rept. 119 239

Quantum Chromodynamics and Jets in e+ e-

P. Hoyer
(
- Nordita
)
,
P. Osland
(
- Nordita
)
,
H.G. Sander
(
- Aachen, Tech. Hochsch.
)
,
T.F. Walsh
(
- DESY
)
,
P.M. Zerwas
(
- Aachen, Tech. Hochsch. and
- DESY
)

- Nucl.Phys.B 161 (1979) 349-372
•
DOI:
- 10.1016/0550-3213(79)90217-7

A Parametrization of the Properties of Quark Jets

R.D. Field
(
- Caltech
)
,
R.P. Feynman
(
- Caltech
)

- Nucl.Phys.B 136 (1978) 1,
•
DOI:
- 10.1016/0550-3213(78)90015-9

A Semiclassical Model for Quark Jet Fragmentation

- Z.Phys.C 1 (1979) 105
•
DOI:
- 10.1007/BF01450386

Semiclassical Models for Gluon Jets and Leptoproduction Based on the Massless Relativistic String

- Z.Phys.C 3 (1980) 223
•
DOI:
- 10.1007/BF01577421

A Three-Dimensional Model for Quark and Gluon Jets

- Z.Phys.C 6 (1980) 235
•
DOI:
- 10.1007/BF01557774

How to Find the Gluon Jets in e+ e- Annihilation

- Phys.Lett.B 94 (1980) 211-215
•
DOI:
- 10.1016/0370-2693(80)90861-8

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

A QCD Analysis of the High-Energy e+ e- Data from PETRA

- Phys.Lett.B 93 (1980) 155-160
•
DOI:
- 10.1016/0370-2693(80)90116-1

The {QCD} Effective Coupling Constant in $e^+ e^-$ Annihilation

Ahmed Ali
(
- DESY
)

- Phys.Lett.B 110 (1982) 67
•
DOI:
- 10.1016/0370-2693(82)90954-6

Initial State Radiation for e+ e- Annihilation Into Jets

Frits A. Berends
(
- DESY and
- Leiden U.
)
,
R. Kleiss
(
- DESY and
- Leiden U.
)

- Nucl.Phys.B 178 (1981) 141-150
•
DOI:
- 10.1016/0550-3213(81)90500-9

- Z.Phys.C 6 296