Summary
Within the exclusive approach discussed in a previous paper, explicit formulae for multiplicities, dispersions and branching ratios for the production of an arbitrary number of quarks and gluons both in quark and gluon jets are calculated in the limitN c → ∞ and in the general case. Multiplicity moments at all orders can in principle be determined. For a convenient choice of the infra-red cut-off, quantitative predictions for relevant physical quantities are shown. It seems that quark and gluon jets still remember after the evolution through a given thickness their origin from one or two colour charges, respectively.
Riassunto
Si calcolano esplicitamente le molteplicità, le dispersioni e i rapporti di deoadimento per la produzione di un numéro arbitrario di quark e di gluoni sia in un getto di quark che in un getto di gluoni, seguendo il metodo esclusivo discusso in un precedente lavoro. Il caloolo è fatto sia nel limite Nc → þ che nel caso generate. I momenti a tutti gli ordini possono similmente essere calcolati. Per una conveniente scelta del taglio infrarosso si ottengono predizioni esplicite per alcune quantità di notevole interesse fisico. Le cose vanno come so il getto di quark e il getto di gluoni si ricordassero dopo la loro evoluzione attraverso un dato spessore delia loro origine rispettivamente da una o da due cariche di colore.
Резюме
В рамках инклюзивног о подхода, рассмотренного в пре дыдущей работе, выводятся явн ые формулы для множес твенностей, дисперсий и отношени й ветвей для рождения п роизвольного числа к варков и глюонов в кварковых и в глюонных струях в пределе Nc → ∞ и в общем случае. В принц ипе, могут быть получены моменты множественн ости во всех порядках. При соответствующем выб оре инфракрасного обрезания получаютс я количественные пре дсказания для соответствующих физических величин. О тмечается, что кварко вые и глюонные струи после прохождения заданно й толщины помнят о их происхождении из одн ого или двух цветных зарядов соот ветственно.
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Reference
K. Konishi, A. Ukawa andG. Veneziano:Phys. Lett. B,78, 243 (1978);80, 259 (1979);Nucl. Phys. B,157, 45 (1979);
K. Konishi: talk presented at theSymposiumon Jets, NBI-Nordita Copenhagen, Kutherford preprint EL-78077 (1978);
G. Veneziano: talk presented at theXIX International Conference on High-Energy Physics (Tokyo, 1978), and references quoted therein;d) G. Veneziano : talk presented17 — 11 Nuovo Cimento A. at theIII Workshop on Current Problems in High-Energy Particle Theory, Florence,May 1979.
A. Giovannini:Nucl. Phys. B,161, 429 (1979);
A. Giovannini: inProceedings of the II International Symposium on ≪ Hadron Structure and Multiparticle Production ≫,Kazimiere (Poland), May 1979;
A. Giovannini: inProceedings of the X International Symposium on 2 Multiparticle Dynamics ≫, Goa (India), September 1979;
A. Giovannini:Nuovo Cimento A,10, 713 (1972);15, 543 (1973).
Yu. L. Dokshitser andD.I. Dyakonov: translated fromFisika Elementarnykh Chastits, XIV Winter School of Leningrad (Leningrad, 1979);
D. Sivees: ANL-HEP-CP-79-42 (October 1979), preprint, talk presented at theTopical Workshop on the Production of New Particles in Super-High-Energy Collisions 254-01 GeV,Madison,October 1979;
P. Hoyer: Nordita-79/33, lectures given at theXIX Cracow School of Theoretical Physics, Zakopane, June 1979.
G. Altarelli andG. Parisi:Nucl. Phys. B,126, 298 (1977);
L. N. Lipatov:Yad. Fiz.,20, 181 (1974).
W. H. Furrt:Phys. Rev.,53, 569 (1937);
W. T. Scott andG. E. Uhlenbeck:Phys. Rev.,62, 497 (1942).
I. V. Andreev:P. H. Lebedev Physical Institute preprint;
P. Cuitanovic, P. Hoyer andK. Konishi: Nordita preprint 79–21;
M. Bishari: Weizmann Institute 43/79 Ph preprint;
K. Kirschner: KMU-HEP 79-04 Karl Marx Universität preprint;
S. Wolfram: CALT-68-740.
J. C. Taylor:Phys. Lett. B,73, 85 (1978).
A. M. Polyakov:Sov. Phys. JETP,33, 850 (1971); S. J. Orfandis and U. Rittenbebg:Phys. Rev. D,10, 2892 (1974).
A. Bassetto, M. Ciafaloni andG. Marchesini: UTF 45, July 1979, preprint and bibliography quoted therein.
G. C. Fox andS. Wolfram: CALT-68-755 preprint.
D. Amati andG. Veneziano:Phys. Lett. B,83, 87 (1979);L. Caneschi: Phys.Lett. B,84, 237 (1979);L. Caneschi andA. Schwimmer:Phys. Lett. B,86, 179 (1979);G. P. Lepage andS. L. Brodsky:Phys. Lett. B,87, 359 (1979);C. B. Chiu andJ. Szwed: MPI-PAE 15/79 Max Planck Institute preprint.
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Anselmino, M., Giovannini, A. & Vercellino, G. QCD jets as markov branching processes. Explicit solutions for the transition probabilities. Nuov Cim A 62, 253–272 (1981). https://doi.org/10.1007/BF02770969
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DOI: https://doi.org/10.1007/BF02770969