Summary
It has been shown recently that, in order to have consistency between some current algebra sum rules, the light-cone expansion leading to Bjorken scaling has to be modified. The required modifications are shown to be consistent with current algebra, but lead to a new scaling regime and to Schwinger terms in σ-commutators. These Schwinger terms appear only in commutators involving nonconserved currents, and may, therefore, provide a natural explanation for the large value of ξ in Kt3-decay, without destroying any of the successful predictions based on current algebra.
Riassunto
Si è mostrato di recente che, per ottenere che certe regole di somma dell’algebra delle correnti siano consistenti, si deve modificare lo sviluppo del cono di luce che conduce alla relazione di scala di Bjorken. Si mostra che le modifiche richieste sono consistenti con l’algebra delle correnti, ma portano a un nuovo regime di scala e a termini di Schwinger nei commutatori σ. Questi termini di Schwinger appaiono solo in commutatori che coinvolgono correnti non conservate e possono, quindi, fornire una spiegazione naturale per il grande valore di Ξ nel decadimento Kt3, senza distruggere alcuna delle riuscite previsioni basate sull’algebra delle correnti.
Реэюме
Недавно было покаэано, что для получения соответствия между некоторыми правилами симм алгебры токов необходимо модифицировать раэложение на севтовом конусе, приводяшее к подобию Бьёркена. Покаэывается, что требуемые модификации согласуются с алгеброй токов, но приводят к новому режиму подобия и к щвингеровским членам в σ-коммутаторах. Эти щвингеровские члены появляются только в коммутаторах, включаюших несохраняюшиеся токи и, следовательно, они мигут дать естественное общяснение для больщих эначений ξ в Кt3 распаде, не иэменяя никаких удачных предскаэаний, основанных на алгебре токов.
Similar content being viewed by others
References
J. D. Bjorken:Phys. Rev.,179, 1547 (1969).
Y. Frishman:Phys. Rev. Lett.,25, 966 (1970);G. Altarelli, R. Brandt andG. Preparata:Phys. Rev. Lett.,26, 42 (1971).
K. Wilson:Phys. Rev.,179, 1499 (1969).
H. Fritzsch andM. Gell-Mann:Proceedings of the International Conference on Duality and Symmetry in Hadron Physics, Tel Aviv Universiy, April 5–7, edited byE. Gotsman (Tel Aviv, 1971).
F. Buccella, R. Gatto, S. Okubo andG. Veneziano:Phys. Rev.,149, 1268 (1966).
B. Lee:Phys. Rev. Lett.,14, 613 (1965);R. F. Dashen andM. Gell-Mann:Phys. Lett.,17, 142 (1965).
N. Cabibbo andA. L. Radicati:Phys. Lett.,19, 697 (1966).
L. Gomberoff andL. Horwitz:Phys. Rev. D,8, 2578 (1973). See alsoL. Gomberoff andL. Horwitz:Phys. Lett.,43 B, 908 (1973).
H. Genz:Tracts in Modern Physics,61, 130 (1972).
J. Katz andL. R. Ram-Mohan:Phys. Rev. D,4, 415 (1971).
R. A. Brandt andJ. Preparata:Ann. of Phys.,61, 119 (1970).
See, for example,Y. Frishman:Lectures at the X International Schladming School, Acta Phys. Austriaca,34, 351 (1971).
See, for example,Y. Frishman: rapporteur talk of theXVI International Conference on High-Energy Physics, Chicago, September 6–13, 1972.
S. Okubo:Phys. Rev. D,3, 409 (1971).
L. Gomberoff:Phys. Rev. D,4, 3202 (1971).
In considering the restrictions imposed on the LCE by covariance and CA we have to take into account the fact that the tensor properties of a LC commutator (and in general of a commutator not evaluated at equal times) are not preserved in the ETL. The tensor properties of an ETC depend on the existence of ST, and covariance of ETC implies restrictions on the nature of the ST, which can, in general, be satisfied by many different tensors (15,17).
A. Casher andL. Gomberoff:Nucl. Phys.,45 B, 71 (1972).
C. Callan andS. Treiman:Phys. Rev. Lett.,16, 153 (1966);V. Mathur, S. Okubo andL. Pandit:Phys. Rev. Lett.,16, 371 (1966).
Particle Data Group:Phys. Lett.,39 B, 1 (1972).
See, for example,D. J. Gross andR. Jackiw:Phys. Rev.,163, 1688 (1967).
S. Adler andR. Dashen:Current Algebras (New York, Amsterdam, 1968).
J. Schwinger:Phys. Rev.,82, 664 (1951);S. Adler:Phys. Rev.,177, 2426 (1969);J. S. Bell andR. Jackiw:Nucl. Phys.,60 A, 47 (1969).
D. G. Sutherland:Nucl. Phys.,2 B, 433 (1967);M. Veltman:Proc. Roy. Soc., A301, 107 (1967).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Andrei, N., Gomberoff, L. Light-cone expansion, current algebra and σ-commutators. Nuov Cim A 21, 277–288 (1974). https://doi.org/10.1007/BF02724807
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF02724807