Jet production and fragmentation in e+e- annihilation at 12-43 GeV

M. Althoff, W. Braunschweig, F. J. Kirschfink, K. Lübelsmeyer, H. U. Martyn, G. Peise, J. Rimkus, P. Rosskamp, H. G. Sander, D. Schmitz, H. Siebke, W. Wallraff, H. M. Fischer, H. Hartmann, W. Hillen, A. Joksch, G. Knop, L. Köpke, H. Kolanoski, H. Kück & 90 others V. Mertens, R. Wedemeyer, N. Wermes, M. Wollstadt, Y. Eisenberg, K. Gather, H. Hultschig, P. Joos, W. Koch, U. Kötz, H. Kowalski, A. Ladage, B. Löhr, D. Lüke, P. Mattig, D. Notz, R. J. Nowak, J. Pyrlik, D. R. Quarrie, M. Rushton, W. Schütte, D. Trines, G. Wolf, Ch Xiao, R. Fohrmann, E. Hilger, T. Kracht, H. L. Krasemann, P. Leu, E. Lohrmann, D. Pandoulas, G. Poelz, K. U. Pösnecker, B. H. Wiik, R. Beuselinck, D. M. Binnie, A. J. Campbell, P. J. Dornan, B. Foster, D. A. Garbutt, C. Jenkins, T. D. Jones, W. G. Jones, J. McCardle, J. K. Sedgbeer, J. Thomas, W. A T Wan Abdullah, K. W. Bell, M. G. Bowler, P. Bull, R. J. Cashmore, P. E L Clarke, R. Devenish, P. Grossmann, C. M. Hawkes, S. L. Lloyd, G. L. Salmon, T. R. Wyatt, C. Youngman, G. E. Forden, J. C. Hart, J. Harvey, D. K. Hasell, J. Proudfoot, D. H. Saxon, P. L. Woodworth, F. Barreiro, M. Dittmar, M. Holder, B. Neumann, E. Duchovni, U. Karshon, G. Mikenberg, R. Mir, D. Revel, E. Ronat, A. Shapira, G. Yekutieli, G. Baranko, T. Barklow, A. Caldwell, Michael G. Cherney, J. M. Izen, M. Mermikides, G. Rudolph, D. Strom, H. Venkataramania, E. Wicklund, Sau Lan Wu, G. Zobernig

Research output: Contribution to journalArticle

219 Citations (Scopus)

Abstract

We present the general properties of jets produced by e+e- annihilation. Their production and fragmentation characteristics have been studied with charged particles for c.m. energies between 12 and 43 GeV. In this energy range e+e- annihilation into hadrons is dominated by pair production of the five quarks u, d, s, c and b. In addition, hard gluon bremsstrahlung effects which are invisible at low energies become prominent at the high energies. The observed multiplicity distributions deviate from a Poisson distribution. The multiplicity distributions for the overall event as well as for each event hemisphere satisfy KNO scaling to within ∼20%. The distributions of xp=2 p/W are presented; scale breaking is observed at the level of 25%. The quantity xpdδ/dxp is compared with multigluon emission calculations which predict a Gaussian distribution in terms of ln(1/x). The observed energy dependence of the maximum of the distributions is in qualitative agreement with the calculations. Particle production is analysed with respect to the jet axis and longitudinal and transverse momentum spectra are presented. The angular distribution of the jet axis strongly supports the idea of predominant spin 1/2 quark pair production. The particle distributions with respect to the event plane show clearly the growing importance of planar events with increasing c.m. energies. They also exclude the presence of heavy quark production, e+e-→Q {Mathematical expression} for quark masses up to 5QQ|=2/3) and 7QQ|=1/3). The comparison of 1/σtotdδ/dpT measured at 14, 22 and 34 GeV suggests that hard gluon bremsstrahlung contributes mainly to transverse momenta larger than 0.5 GeV/c. The rapidity distribution for W≧22 GeV shows an enhancement away from y=0 which corresponds to an increase in yield of 10-15% compared to the centre region (y=0). The enhancement probably results from heavy quark production and gluon bremsstrahlung. The particle flux around the jet axis shows with increasing c.m. energy a rapidly growing number of particles collimated around the jet axis, while at large angles to the jet axis almost no W dependence is observed. For fixed longitudinal momentum p{norm of matrix} approximate "fan invariance" is seen: The shape of the angular distribution around the jet axis is almost independent of W. The collimation depends strongly on p{norm of matrix}. For small p{norm of matrix}, p{norm of matrix}{norm of matrix} the particles tend to be emitted closer and closer to the jet axis.

Original languageEnglish
Pages (from-to)307-340
Number of pages34
JournalZeitschrift für Physik C Particles and Fields
Volume22
Issue number4
DOIs
StatePublished - Dec 1984
Externally publishedYes

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norms
fragmentation
quarks
bremsstrahlung
Momentum
Angular distribution
matrices
pair production
energy
transverse momentum
Hadrons
angular distribution
Poisson distribution
momentum
Gaussian distribution
Charged particles
augmentation
Invariance
particle production
collimation

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

Althoff, M., Braunschweig, W., Kirschfink, F. J., Lübelsmeyer, K., Martyn, H. U., Peise, G., ... Zobernig, G. (1984). Jet production and fragmentation in e+e- annihilation at 12-43 GeV. Zeitschrift für Physik C Particles and Fields, 22(4), 307-340. https://doi.org/10.1007/BF01547419

Jet production and fragmentation in e+e- annihilation at 12-43 GeV. / Althoff, M.; Braunschweig, W.; Kirschfink, F. J.; Lübelsmeyer, K.; Martyn, H. U.; Peise, G.; Rimkus, J.; Rosskamp, P.; Sander, H. G.; Schmitz, D.; Siebke, H.; Wallraff, W.; Fischer, H. M.; Hartmann, H.; Hillen, W.; Joksch, A.; Knop, G.; Köpke, L.; Kolanoski, H.; Kück, H.; Mertens, V.; Wedemeyer, R.; Wermes, N.; Wollstadt, M.; Eisenberg, Y.; Gather, K.; Hultschig, H.; Joos, P.; Koch, W.; Kötz, U.; Kowalski, H.; Ladage, A.; Löhr, B.; Lüke, D.; Mattig, P.; Notz, D.; Nowak, R. J.; Pyrlik, J.; Quarrie, D. R.; Rushton, M.; Schütte, W.; Trines, D.; Wolf, G.; Xiao, Ch; Fohrmann, R.; Hilger, E.; Kracht, T.; Krasemann, H. L.; Leu, P.; Lohrmann, E.; Pandoulas, D.; Poelz, G.; Pösnecker, K. U.; Wiik, B. H.; Beuselinck, R.; Binnie, D. M.; Campbell, A. J.; Dornan, P. J.; Foster, B.; Garbutt, D. A.; Jenkins, C.; Jones, T. D.; Jones, W. G.; McCardle, J.; Sedgbeer, J. K.; Thomas, J.; Abdullah, W. A T Wan; Bell, K. W.; Bowler, M. G.; Bull, P.; Cashmore, R. J.; Clarke, P. E L; Devenish, R.; Grossmann, P.; Hawkes, C. M.; Lloyd, S. L.; Salmon, G. L.; Wyatt, T. R.; Youngman, C.; Forden, G. E.; Hart, J. C.; Harvey, J.; Hasell, D. K.; Proudfoot, J.; Saxon, D. H.; Woodworth, P. L.; Barreiro, F.; Dittmar, M.; Holder, M.; Neumann, B.; Duchovni, E.; Karshon, U.; Mikenberg, G.; Mir, R.; Revel, D.; Ronat, E.; Shapira, A.; Yekutieli, G.; Baranko, G.; Barklow, T.; Caldwell, A.; Cherney, Michael G.; Izen, J. M.; Mermikides, M.; Rudolph, G.; Strom, D.; Venkataramania, H.; Wicklund, E.; Wu, Sau Lan; Zobernig, G.

In: Zeitschrift für Physik C Particles and Fields, Vol. 22, No. 4, 12.1984, p. 307-340.

Research output: Contribution to journalArticle

Althoff, M, Braunschweig, W, Kirschfink, FJ, Lübelsmeyer, K, Martyn, HU, Peise, G, Rimkus, J, Rosskamp, P, Sander, HG, Schmitz, D, Siebke, H, Wallraff, W, Fischer, HM, Hartmann, H, Hillen, W, Joksch, A, Knop, G, Köpke, L, Kolanoski, H, Kück, H, Mertens, V, Wedemeyer, R, Wermes, N, Wollstadt, M, Eisenberg, Y, Gather, K, Hultschig, H, Joos, P, Koch, W, Kötz, U, Kowalski, H, Ladage, A, Löhr, B, Lüke, D, Mattig, P, Notz, D, Nowak, RJ, Pyrlik, J, Quarrie, DR, Rushton, M, Schütte, W, Trines, D, Wolf, G, Xiao, C, Fohrmann, R, Hilger, E, Kracht, T, Krasemann, HL, Leu, P, Lohrmann, E, Pandoulas, D, Poelz, G, Pösnecker, KU, Wiik, BH, Beuselinck, R, Binnie, DM, Campbell, AJ, Dornan, PJ, Foster, B, Garbutt, DA, Jenkins, C, Jones, TD, Jones, WG, McCardle, J, Sedgbeer, JK, Thomas, J, Abdullah, WATW, Bell, KW, Bowler, MG, Bull, P, Cashmore, RJ, Clarke, PEL, Devenish, R, Grossmann, P, Hawkes, CM, Lloyd, SL, Salmon, GL, Wyatt, TR, Youngman, C, Forden, GE, Hart, JC, Harvey, J, Hasell, DK, Proudfoot, J, Saxon, DH, Woodworth, PL, Barreiro, F, Dittmar, M, Holder, M, Neumann, B, Duchovni, E, Karshon, U, Mikenberg, G, Mir, R, Revel, D, Ronat, E, Shapira, A, Yekutieli, G, Baranko, G, Barklow, T, Caldwell, A, Cherney, MG, Izen, JM, Mermikides, M, Rudolph, G, Strom, D, Venkataramania, H, Wicklund, E, Wu, SL & Zobernig, G 1984, 'Jet production and fragmentation in e+e- annihilation at 12-43 GeV', Zeitschrift für Physik C Particles and Fields, vol. 22, no. 4, pp. 307-340. https://doi.org/10.1007/BF01547419
Althoff M, Braunschweig W, Kirschfink FJ, Lübelsmeyer K, Martyn HU, Peise G et al. Jet production and fragmentation in e+e- annihilation at 12-43 GeV. Zeitschrift für Physik C Particles and Fields. 1984 Dec;22(4):307-340. https://doi.org/10.1007/BF01547419
Althoff, M. ; Braunschweig, W. ; Kirschfink, F. J. ; Lübelsmeyer, K. ; Martyn, H. U. ; Peise, G. ; Rimkus, J. ; Rosskamp, P. ; Sander, H. G. ; Schmitz, D. ; Siebke, H. ; Wallraff, W. ; Fischer, H. M. ; Hartmann, H. ; Hillen, W. ; Joksch, A. ; Knop, G. ; Köpke, L. ; Kolanoski, H. ; Kück, H. ; Mertens, V. ; Wedemeyer, R. ; Wermes, N. ; Wollstadt, M. ; Eisenberg, Y. ; Gather, K. ; Hultschig, H. ; Joos, P. ; Koch, W. ; Kötz, U. ; Kowalski, H. ; Ladage, A. ; Löhr, B. ; Lüke, D. ; Mattig, P. ; Notz, D. ; Nowak, R. J. ; Pyrlik, J. ; Quarrie, D. R. ; Rushton, M. ; Schütte, W. ; Trines, D. ; Wolf, G. ; Xiao, Ch ; Fohrmann, R. ; Hilger, E. ; Kracht, T. ; Krasemann, H. L. ; Leu, P. ; Lohrmann, E. ; Pandoulas, D. ; Poelz, G. ; Pösnecker, K. U. ; Wiik, B. H. ; Beuselinck, R. ; Binnie, D. M. ; Campbell, A. J. ; Dornan, P. J. ; Foster, B. ; Garbutt, D. A. ; Jenkins, C. ; Jones, T. D. ; Jones, W. G. ; McCardle, J. ; Sedgbeer, J. K. ; Thomas, J. ; Abdullah, W. A T Wan ; Bell, K. W. ; Bowler, M. G. ; Bull, P. ; Cashmore, R. J. ; Clarke, P. E L ; Devenish, R. ; Grossmann, P. ; Hawkes, C. M. ; Lloyd, S. L. ; Salmon, G. L. ; Wyatt, T. R. ; Youngman, C. ; Forden, G. E. ; Hart, J. C. ; Harvey, J. ; Hasell, D. K. ; Proudfoot, J. ; Saxon, D. H. ; Woodworth, P. L. ; Barreiro, F. ; Dittmar, M. ; Holder, M. ; Neumann, B. ; Duchovni, E. ; Karshon, U. ; Mikenberg, G. ; Mir, R. ; Revel, D. ; Ronat, E. ; Shapira, A. ; Yekutieli, G. ; Baranko, G. ; Barklow, T. ; Caldwell, A. ; Cherney, Michael G. ; Izen, J. M. ; Mermikides, M. ; Rudolph, G. ; Strom, D. ; Venkataramania, H. ; Wicklund, E. ; Wu, Sau Lan ; Zobernig, G. / Jet production and fragmentation in e+e- annihilation at 12-43 GeV. In: Zeitschrift für Physik C Particles and Fields. 1984 ; Vol. 22, No. 4. pp. 307-340.
@article{a993242529d74463b77bdaee688690da,
title = "Jet production and fragmentation in e+e- annihilation at 12-43 GeV",
abstract = "We present the general properties of jets produced by e+e- annihilation. Their production and fragmentation characteristics have been studied with charged particles for c.m. energies between 12 and 43 GeV. In this energy range e+e- annihilation into hadrons is dominated by pair production of the five quarks u, d, s, c and b. In addition, hard gluon bremsstrahlung effects which are invisible at low energies become prominent at the high energies. The observed multiplicity distributions deviate from a Poisson distribution. The multiplicity distributions for the overall event as well as for each event hemisphere satisfy KNO scaling to within ∼20{\%}. The distributions of xp=2 p/W are presented; scale breaking is observed at the level of 25{\%}. The quantity xpdδ/dxp is compared with multigluon emission calculations which predict a Gaussian distribution in terms of ln(1/x). The observed energy dependence of the maximum of the distributions is in qualitative agreement with the calculations. Particle production is analysed with respect to the jet axis and longitudinal and transverse momentum spectra are presented. The angular distribution of the jet axis strongly supports the idea of predominant spin 1/2 quark pair production. The particle distributions with respect to the event plane show clearly the growing importance of planar events with increasing c.m. energies. They also exclude the presence of heavy quark production, e+e-→Q {Mathematical expression} for quark masses up to 5QQ|=2/3) and 7QQ|=1/3). The comparison of 1/σtotdδ/dpT measured at 14, 22 and 34 GeV suggests that hard gluon bremsstrahlung contributes mainly to transverse momenta larger than 0.5 GeV/c. The rapidity distribution for W≧22 GeV shows an enhancement away from y=0 which corresponds to an increase in yield of 10-15{\%} compared to the centre region (y=0). The enhancement probably results from heavy quark production and gluon bremsstrahlung. The particle flux around the jet axis shows with increasing c.m. energy a rapidly growing number of particles collimated around the jet axis, while at large angles to the jet axis almost no W dependence is observed. For fixed longitudinal momentum p{norm of matrix} approximate {"}fan invariance{"} is seen: The shape of the angular distribution around the jet axis is almost independent of W. The collimation depends strongly on p{norm of matrix}. For small p{norm of matrix}, p{norm of matrix}{norm of matrix} the particles tend to be emitted closer and closer to the jet axis.",
author = "M. Althoff and W. Braunschweig and Kirschfink, {F. J.} and K. L{\"u}belsmeyer and Martyn, {H. U.} and G. Peise and J. Rimkus and P. Rosskamp and Sander, {H. G.} and D. Schmitz and H. Siebke and W. Wallraff and Fischer, {H. M.} and H. Hartmann and W. Hillen and A. Joksch and G. Knop and L. K{\"o}pke and H. Kolanoski and H. K{\"u}ck and V. Mertens and R. Wedemeyer and N. Wermes and M. Wollstadt and Y. Eisenberg and K. Gather and H. Hultschig and P. Joos and W. Koch and U. K{\"o}tz and H. Kowalski and A. Ladage and B. L{\"o}hr and D. L{\"u}ke and P. Mattig and D. Notz and Nowak, {R. J.} and J. Pyrlik and Quarrie, {D. R.} and M. Rushton and W. Sch{\"u}tte and D. Trines and G. Wolf and Ch Xiao and R. Fohrmann and E. Hilger and T. Kracht and Krasemann, {H. L.} and P. Leu and E. Lohrmann and D. Pandoulas and G. Poelz and P{\"o}snecker, {K. U.} and Wiik, {B. H.} and R. Beuselinck and Binnie, {D. M.} and Campbell, {A. J.} and Dornan, {P. J.} and B. Foster and Garbutt, {D. A.} and C. Jenkins and Jones, {T. D.} and Jones, {W. G.} and J. McCardle and Sedgbeer, {J. K.} and J. Thomas and Abdullah, {W. A T Wan} and Bell, {K. W.} and Bowler, {M. G.} and P. Bull and Cashmore, {R. J.} and Clarke, {P. E L} and R. Devenish and P. Grossmann and Hawkes, {C. M.} and Lloyd, {S. L.} and Salmon, {G. L.} and Wyatt, {T. R.} and C. Youngman and Forden, {G. E.} and Hart, {J. C.} and J. Harvey and Hasell, {D. K.} and J. Proudfoot and Saxon, {D. H.} and Woodworth, {P. L.} and F. Barreiro and M. Dittmar and M. Holder and B. Neumann and E. Duchovni and U. Karshon and G. Mikenberg and R. Mir and D. Revel and E. Ronat and A. Shapira and G. Yekutieli and G. Baranko and T. Barklow and A. Caldwell and Cherney, {Michael G.} and Izen, {J. M.} and M. Mermikides and G. Rudolph and D. Strom and H. Venkataramania and E. Wicklund and Wu, {Sau Lan} and G. Zobernig",
year = "1984",
month = "12",
doi = "10.1007/BF01547419",
language = "English",
volume = "22",
pages = "307--340",
journal = "Zeitschrift fur Physik C-Particles and Fields",
issn = "1434-6044",
publisher = "Springer New York",
number = "4",

}

TY - JOUR

T1 - Jet production and fragmentation in e+e- annihilation at 12-43 GeV

AU - Althoff, M.

AU - Braunschweig, W.

AU - Kirschfink, F. J.

AU - Lübelsmeyer, K.

AU - Martyn, H. U.

AU - Peise, G.

AU - Rimkus, J.

AU - Rosskamp, P.

AU - Sander, H. G.

AU - Schmitz, D.

AU - Siebke, H.

AU - Wallraff, W.

AU - Fischer, H. M.

AU - Hartmann, H.

AU - Hillen, W.

AU - Joksch, A.

AU - Knop, G.

AU - Köpke, L.

AU - Kolanoski, H.

AU - Kück, H.

AU - Mertens, V.

AU - Wedemeyer, R.

AU - Wermes, N.

AU - Wollstadt, M.

AU - Eisenberg, Y.

AU - Gather, K.

AU - Hultschig, H.

AU - Joos, P.

AU - Koch, W.

AU - Kötz, U.

AU - Kowalski, H.

AU - Ladage, A.

AU - Löhr, B.

AU - Lüke, D.

AU - Mattig, P.

AU - Notz, D.

AU - Nowak, R. J.

AU - Pyrlik, J.

AU - Quarrie, D. R.

AU - Rushton, M.

AU - Schütte, W.

AU - Trines, D.

AU - Wolf, G.

AU - Xiao, Ch

AU - Fohrmann, R.

AU - Hilger, E.

AU - Kracht, T.

AU - Krasemann, H. L.

AU - Leu, P.

AU - Lohrmann, E.

AU - Pandoulas, D.

AU - Poelz, G.

AU - Pösnecker, K. U.

AU - Wiik, B. H.

AU - Beuselinck, R.

AU - Binnie, D. M.

AU - Campbell, A. J.

AU - Dornan, P. J.

AU - Foster, B.

AU - Garbutt, D. A.

AU - Jenkins, C.

AU - Jones, T. D.

AU - Jones, W. G.

AU - McCardle, J.

AU - Sedgbeer, J. K.

AU - Thomas, J.

AU - Abdullah, W. A T Wan

AU - Bell, K. W.

AU - Bowler, M. G.

AU - Bull, P.

AU - Cashmore, R. J.

AU - Clarke, P. E L

AU - Devenish, R.

AU - Grossmann, P.

AU - Hawkes, C. M.

AU - Lloyd, S. L.

AU - Salmon, G. L.

AU - Wyatt, T. R.

AU - Youngman, C.

AU - Forden, G. E.

AU - Hart, J. C.

AU - Harvey, J.

AU - Hasell, D. K.

AU - Proudfoot, J.

AU - Saxon, D. H.

AU - Woodworth, P. L.

AU - Barreiro, F.

AU - Dittmar, M.

AU - Holder, M.

AU - Neumann, B.

AU - Duchovni, E.

AU - Karshon, U.

AU - Mikenberg, G.

AU - Mir, R.

AU - Revel, D.

AU - Ronat, E.

AU - Shapira, A.

AU - Yekutieli, G.

AU - Baranko, G.

AU - Barklow, T.

AU - Caldwell, A.

AU - Cherney, Michael G.

AU - Izen, J. M.

AU - Mermikides, M.

AU - Rudolph, G.

AU - Strom, D.

AU - Venkataramania, H.

AU - Wicklund, E.

AU - Wu, Sau Lan

AU - Zobernig, G.

PY - 1984/12

Y1 - 1984/12

N2 - We present the general properties of jets produced by e+e- annihilation. Their production and fragmentation characteristics have been studied with charged particles for c.m. energies between 12 and 43 GeV. In this energy range e+e- annihilation into hadrons is dominated by pair production of the five quarks u, d, s, c and b. In addition, hard gluon bremsstrahlung effects which are invisible at low energies become prominent at the high energies. The observed multiplicity distributions deviate from a Poisson distribution. The multiplicity distributions for the overall event as well as for each event hemisphere satisfy KNO scaling to within ∼20%. The distributions of xp=2 p/W are presented; scale breaking is observed at the level of 25%. The quantity xpdδ/dxp is compared with multigluon emission calculations which predict a Gaussian distribution in terms of ln(1/x). The observed energy dependence of the maximum of the distributions is in qualitative agreement with the calculations. Particle production is analysed with respect to the jet axis and longitudinal and transverse momentum spectra are presented. The angular distribution of the jet axis strongly supports the idea of predominant spin 1/2 quark pair production. The particle distributions with respect to the event plane show clearly the growing importance of planar events with increasing c.m. energies. They also exclude the presence of heavy quark production, e+e-→Q {Mathematical expression} for quark masses up to 5QQ|=2/3) and 7QQ|=1/3). The comparison of 1/σtotdδ/dpT measured at 14, 22 and 34 GeV suggests that hard gluon bremsstrahlung contributes mainly to transverse momenta larger than 0.5 GeV/c. The rapidity distribution for W≧22 GeV shows an enhancement away from y=0 which corresponds to an increase in yield of 10-15% compared to the centre region (y=0). The enhancement probably results from heavy quark production and gluon bremsstrahlung. The particle flux around the jet axis shows with increasing c.m. energy a rapidly growing number of particles collimated around the jet axis, while at large angles to the jet axis almost no W dependence is observed. For fixed longitudinal momentum p{norm of matrix} approximate "fan invariance" is seen: The shape of the angular distribution around the jet axis is almost independent of W. The collimation depends strongly on p{norm of matrix}. For small p{norm of matrix}, p{norm of matrix}{norm of matrix} the particles tend to be emitted closer and closer to the jet axis.

AB - We present the general properties of jets produced by e+e- annihilation. Their production and fragmentation characteristics have been studied with charged particles for c.m. energies between 12 and 43 GeV. In this energy range e+e- annihilation into hadrons is dominated by pair production of the five quarks u, d, s, c and b. In addition, hard gluon bremsstrahlung effects which are invisible at low energies become prominent at the high energies. The observed multiplicity distributions deviate from a Poisson distribution. The multiplicity distributions for the overall event as well as for each event hemisphere satisfy KNO scaling to within ∼20%. The distributions of xp=2 p/W are presented; scale breaking is observed at the level of 25%. The quantity xpdδ/dxp is compared with multigluon emission calculations which predict a Gaussian distribution in terms of ln(1/x). The observed energy dependence of the maximum of the distributions is in qualitative agreement with the calculations. Particle production is analysed with respect to the jet axis and longitudinal and transverse momentum spectra are presented. The angular distribution of the jet axis strongly supports the idea of predominant spin 1/2 quark pair production. The particle distributions with respect to the event plane show clearly the growing importance of planar events with increasing c.m. energies. They also exclude the presence of heavy quark production, e+e-→Q {Mathematical expression} for quark masses up to 5QQ|=2/3) and 7QQ|=1/3). The comparison of 1/σtotdδ/dpT measured at 14, 22 and 34 GeV suggests that hard gluon bremsstrahlung contributes mainly to transverse momenta larger than 0.5 GeV/c. The rapidity distribution for W≧22 GeV shows an enhancement away from y=0 which corresponds to an increase in yield of 10-15% compared to the centre region (y=0). The enhancement probably results from heavy quark production and gluon bremsstrahlung. The particle flux around the jet axis shows with increasing c.m. energy a rapidly growing number of particles collimated around the jet axis, while at large angles to the jet axis almost no W dependence is observed. For fixed longitudinal momentum p{norm of matrix} approximate "fan invariance" is seen: The shape of the angular distribution around the jet axis is almost independent of W. The collimation depends strongly on p{norm of matrix}. For small p{norm of matrix}, p{norm of matrix}{norm of matrix} the particles tend to be emitted closer and closer to the jet axis.

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U2 - 10.1007/BF01547419

DO - 10.1007/BF01547419

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EP - 340

JO - Zeitschrift fur Physik C-Particles and Fields

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IS - 4

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