Abstract
The mean charged multiplicity as well as its distribution has been measured as a function of c.m. energy in the reactione + e −→hadrons. Fragmentation models are compared with the data. After applying radiative corrections the mean charged multiplicity is measured to be 8.4±0.3±0.6 at 12 GeV, 13.1±0.3±0.6 at 30 GeV and 13.6±0.3±0.6 at 35 GeV. The ratio of mean charged multiplicity to the dispersion (<N ch>/D ch) is almost constant in the energy range studied, indicating KNO scaling of the charged multiplicity. The inclusive differential cross sections(dσ/dx p ) shows scaling violation in the highx p region (x p >0.15). The absolute value of the scaling violation is consistent with the result of 2nd order QCD calculations. The production of neutral kaons has been investigated by identifying the decayK 0 S →π+π−. The production probability for a strange quark relative to that of au ord quark in the fragmentation, γ s , has been determined to be 0.27±0.03±0.05 averaged over c.m. energies from 12 to 35 GeV. Momentum spectra for neutral kaons are presented and are compared with model predictions.
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References
TASSO Collab. R. Brandelik et al.: Phys. Lett.86B, 243 (1979); MARK J Collab. D.P. Barber et al.: Phys. Rev. Lett.43, 830 (1979); PLUTO Collab. Ch. Berger et al.: Phys. Lett.86B, 418 (1979); JADE Collab. W. Bartel et al.: Phys. Lett.91B, 142 (1980); W. Braunschweig: Int. Symp. on Lepton and Photon Interactions at High Energy p. 68, Bonn, Germany (1981)
JADE Collab. W. Bartel et al.: Phys. Lett.115B, 338 (1982)
This paper is based on the Ph.D. thesis by S. Komamiya (UTLICEPP-82-01, LICEPP Faculty of Science, University of Tokyo)
JADE Collab. W. Bartel et al.: Phys. Lett.88B, 171 (1979)
F.A. Berends, R. Kleiss: DESY 80/66 (1980); F.A. Berends, R. Kleiss: DESY 80/73 (1980)
T. Sjöstrand, B. Söderberg: LU-TP78-18 (1978); B. Anderson et al.: Z. Phys. C — Particles and Fields1, 105 (1978); B. Anderson, G. Gustafson: Z. Phys. C — Particles and Fields3, 223 (1980); T. Sjöstrand: LU-TP80-03 (1980); B. Anderson et al.: LU-TP81-03 (1981); T. Sjöstrand Comput. Phys. Commun.27, 243 (1982)
Precise measurement of total cross section for the processe + e −→hadrons in the cm energy range between 12.0 and 36.4 GeV, JADE-Collaboration, DESY 83-050
JADE Collab. W. Bartel et al.: Z. Phys. C — Particles and Fields6, 295 (1980)
H. Hoyer et al.: Nucl. Phys.B161, 349 (1979); H. Hoyer et al.: DESY 79/21 (1979)
12 and 30 GeV: MARK J and PLUTO Collaborations; 35 GeV: JADE and MARK J Collaborations; XXth Int. Conf. on High Energy Physics, p. 593. Madison, U.S.A. (1980)
JADE Collab. W. Bartel et al.: Phys. Lett.104B, 325 (1981); TASSO Collab. R. Brandelik et al.: Phys. Lett.105B, 75 (1981)
TASSO Collab.: R. Brandelik et al.: DESY 82-070
TASSO Collab.: Diplomarbeit by M. Dittmar, DESY F1-82-03
TASSO Collab. R. Brandelik et al.: Phys. Lett.89B, 418 (1979)
C. Bacci et al.: Phys. Lett.86B, 234 (1979); J.L. Siegrist: Ph.D. thesis, SLAC-225 (1979); PLUTO Collab. Ch. Berger et al.: Phys. Lett.81B, 410 (1979)
R.P. Feynman: Phys. Rev. Lett.23, 1415 (1969)
For a comparison of the predictions for the multiplicity of various phenomenological models see H. Satz: Current induced reactions, p. 49, vol 56 Berlin, Heidelberg, New York: Springer 1976
W.T. Thome et al.: Nucl. Phys.B129, 365 (1977); K. Alpgard et al.: Phys. Lett.107B, 315 (1981)
K. Konishi: Rutherfold Lab. RL 79-035 (1979); W. Furmanski et al.: Nucl. Phys.B155, 253 (1979); A. Bassaeto et al.: Nucl. Phys.B163, 477 (1980)
A.H. Mueller et al.: Columbia Univ. CUTP 197 (1981)
S. Wada: Phys. Lett.95B, 426 (1980)
S. Yamada: XXth Int. Conf. on High Energy Physics, p. 616. Madison, U.S.A. (1980); G. Wolf; rapporteur's talk, XXIIth Int. Conf. on High Energy Physics, Paris, France (1982)
W. Bartel et al.: DESY 82-060 (1982), to be published
JADE results as discussed by W. Braunschweig in [1] W. Braunschweig: Int. Symp. on Lepton and Photon Interactions at High Energy p. 68, Bonn, Germany (1981)
R.D. Field, R.P. Feynman: Nucl. Phys.B128, 1 (1977)
H. Georgi, H.D. Politzer: Nucl. Phys.B136, 136 (1978); H.J. Buras: Review of Mod. Phys.52, 199 (1980); G. Altarelli: Phys. Rep.81, 1 (1982).
H. Ali et al.: Phys. Lett.93B, 155 (1980)
J.D. Gross: Phys. Rev. Lett.32, 1071 (1974)
CLEO Collab, M.S. Alam et al.: Phys. Rev. Lett.49, 357 (1982)
JADE Collab. W. Bartel et al.: Phys. Lett.101 B, 129 (1981); Evidence for fragmentation along the colour flux lines in 3-jet events. JADE-Collaboration, DESY 83-079/080
PLUTO Collab. Ch. Berger et al.: Phys. Lett.81 B, 410 (1979); LENA Collaboration: DESY 81-008 (1981)
S. Wolfram: CALT-68-778 (1980); K. Konishi et al.: Nucl. Phys.B 157, 45 (1979)
Z. Koba, H.B. Nielsen, P. Olesen: Nucl. Phys.B40, 317 (1972)
S. Barshay, Y. Yamaguchi; Phys. Lett.51B, 376 (1974); S. Barshay: Phys. Lett.116B, 193 (1982)
B.W. Allardyce et al.: Nucl. Phys.A209, 1 (1973); A.S. Clough et al.: Nucl. Phys.B76, 15 (1974)
TASSO Collab. R. Brandelik et al.: Phys. Lett.114B, 65 (1982); MARK-II Collab. J.F. Patrick et al.: Phys. Rev. Lett.49, 1232 (1982)
C. Peterson et al.: Phys. Rev.D27, 105 (1983)
CDHS Collab. H. Abramowicz et al.: Z. Phys. C — Particles and Fields15, 19 (1982); MARK-II Collab. J.N. Yelton et al.: Phys. Rev. Lett.49, 430 (1982); TASSO Collab. M. Althoff et al.: DESY 83-010; CLEO Collab. C. Bebek et al.: CLEO 82-01
TASSO Collab. R. Brandelik et al.: Phys. Lett.117 B, 135 (1982)
The differential cross section for momentum bini is given by\({{({{d\sigma } \mathord{\left/ {\vphantom {{d\sigma } {dp}}} \right. \kern-\nulldelimiterspace} {dp}})_i = \{ N( + - ) - N(bkg)\} } \mathord{\left/ {\vphantom {{({{d\sigma } \mathord{\left/ {\vphantom {{d\sigma } {dp}}} \right. \kern-\nulldelimiterspace} {dp}})_i = \{ N( + - ) - N(bkg)\} } {\{ \varepsilon _\iota \cdot \Delta _i \cdot L \cdot \varepsilon (1 + \delta )\} }}} \right. \kern-\nulldelimiterspace} {\{ \varepsilon _\iota \cdot \Delta _i \cdot L \cdot \varepsilon (1 + \delta )\} }} \cdot f_i ,\) whereN(+ −) is the number of observed oppositely charged pairs in bini,N(bkg) is the number of background combinations estimated from like charged pairs in bini, ɛ i is the detection efficiency of the neutral kaons in bini (corrected by branching ratio ofK 0 S →π+π− and a factor 2 forK 0 L ) is the width of the momentum bini,L is the integrated luminosity obtained from the number of Bhabba events in the barrel leadglass counters, andf i is the radiative correction factor
TASSO Collab. R. Brandelik et al.: Phys. Lett.94B, 91 (1980); TASSO Collab. R. Brandelik et al.: Phys. Lett.105B, 75 (1981)
DASP Collab. R. Brandelik et al.: Nucl. Phys.B148, 189 (1979)
MARK-I Collab. V. Lüth et al.: Phys. Lett.70 B, 120 (1977)
PLUTO Collab. Ch. Berger et al.: Phys. Lett.104 B, 79 (1981)
MARK-II Collab. J. Dorfan: SLAC-PUB2813 (1982)
CLEO Collab. A. Brody et al.: Phys. Rev. Lett.48, 1070 (1982)
P.K. Malhatra, R. Orava: Fermilab-Pub 82/79 (1982); V. Ammosov et al.: Phys. Lett.93 B, 210 (1980); N. Schmitz: Proc. Int. Conf. on Lepton and Photon 359 (1979)
V.V. Anisovich, V.M. Shekhter: Nucl. Phys.55B, 455 (1973); A. Suzuki et al.: Lett. Nuovo Cimento24, 449 (1979); D. Drijard et al.: CERN/EP81-12 (1981)
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JADE Collaboration., Bartel, W., Becker, L. et al. Charged particle and neutral kaon production ine + e − annihilation at PETRA. Z. Phys. C - Particles and Fields 20, 187–206 (1983). https://doi.org/10.1007/BF01574851
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DOI: https://doi.org/10.1007/BF01574851