Summary
The interplay between the constraints of chiralSU 2×SU 2 symmetry and Regge asymptotic behaviour is investigated. We review the derivation of various current algebra sum rules in a study of the reaction π+α→π+β. These sum rules imply that all particles may be classified in multiplets ofSU 2×SU 2 and that each of these multiplets may contain linear combinations of an infinite number of physical states. Extending our study to the reaction π+α→π+π+β, we derive new sum rules involving commutators of the axial charge with the reggeon coupling matrices of the ρ and f Regge trajectories. Some applications of these new sum rules are noted, and the general utility of these and related sum rules is discussed.
Riassunto
Si studia l’influsso reciproco fra i vincoli della simmetriaSU 2×SU 2 chirale ed il comportamento asintotico di Regge. Si passa in rassegna la deduzione di varie regole di somma dell’algebra delle correnti in uno studio della reazione π+α→π+β. Queste regole di somma implicano che ciascuno di questi multipletti può contenere combinazioni lineari di un numero infinito di stati fisici. Estendendo lo studio alla reazione π+α→π+π+β si deducono nuove regole di somma che coinvolgono i commutatori della carica assiale con la matrice di accoppiamento dei reggeoni delle traiettorie di Regge ρ ed f. Si notano alcune applicazioni di queste regole di somma e si discute l’utilità generale di queste regole di somma e di quelle ad esse correlate.
Реэюме
Исследуется вэаимосвяэь между ограничениями киральнойSU 2 ×SU 2 симметрии и асимптотическим поведением Редже. Мы рассматриваем вывод раэличных правил сумм алгебры токов при иэучении реакции π + α → π + β. Эти правила сумм подраэумевают, что частицы могут быть классифицированы в мульти-плетыSU 2 ×SU 2 и что каждый иэ зтих мультиплетов может содержать линейные комбинации бесконечного числа фиэических состояний. Распространяя наще исследование на реакцию π + α → π + π + β, мы выводим новые правила сумм, включаюшие коммутаторы аксиального эаряда с реджеонными матрицами свяэи для ρ и f траекторий Редже. Укаэываются некоторые применения зтих новых правил сумм и обсуждается обшая ценность зтих и родственных правил сумм.
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References
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This is a statement of the hypothesis that Regge poles (exclusive of the pomeron) are dual to resonances. SeeP. G. O. Freund:Phys. Rev. Lett.,20, 1235 (1968);H. Harari:Phys. Rev. Lett.,20, 1395 (1968). The addition of a pomeron term of eq. (2.13) would not significantly alter any of our subsequent conclusions. The crucial feature of this equation is the fact thatM (+)(s, λ) is infinite in the limits→∞; the rate at whichM (+)(s, λ) tends to ∞ is not really important.
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Research supported by a National Science Foundation Postdoctoral Fellowship.
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Carlitz, R. Current algebra sum rules for reggeons. Nuov Cim A 12, 1049–1064 (1972). https://doi.org/10.1007/BF02747866
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DOI: https://doi.org/10.1007/BF02747866