Summary
Structure functions in ep → e + X are directly obtained by using Wilson’s short-distance expansion and the conformal covariant light-cone expansion. It is shown that Bjorken scaling is broken in general due to the existence of anomalous dimensions in the expansions. It is also shown that the Drell-Yan-West relation does not hold because of the anomalous dimension. The method is applied to e+e− → h + X and the one-particle distribution is calculated to give \(s(d\sigma /d\omega )\xrightarrow[{\omega \to 1}]{}(1 - \omega )^{2l_{\pi - 3} } \), wherel π is the dimension of the pion field.l π is determined to bel π=2.5 from the experimental data of e+e− → π + X.
Riassunto
Si ottengono direttamente funzioni di struttura in ep → e + X usando lo sviluppo di breve distanza di Wilson e lo sviluppo del cono di luce covariante conforme. Si mostra che la variazione di scala di Bjorken si infrange generalmente a causa dell’esistenza di dimensioni anomale negli sviluppi. Si mostra anche che la relazione di Drell-Yan-West non vale a causa della dimensione anomala. Si applica il metodo a e+e− → h + X e si calcola la distribuzione di una particella per avere \(s(d\sigma /d\omega )\xrightarrow[{\omega \to 1}]{}(1 - \omega )^{2l_{\pi - 3} } \) dovel π è la dimensione del campo pionico.l π è determinato esserel π=2.5 dai dati sperimentali di e+e− → π + X.
Реэюме
Испольэуя раэложение Вильсона на малых расстояниях и конформное ковариантное раэложение на световом конусе, непосредственно получаются струк-турные функции в ep → e+X. Покаэывается, что подобие Бьёркена нарущается вследствие сушествования аномального числа иэмерений в раэложениях. Также отмечается, что соотнощение Дрелла-Яна-Веста несправедливо иэ-эа аномального числа иэмерений. Предложенный метод применяется к процессу e+e−→h+Х. Вычисление одночастичного распределения дает \(s(d\sigma /d\omega )\xrightarrow[{\omega \to 1}]{}(1 - \omega )^{2l_{\pi - 3} } \), гдеl π есть число иэмерений пионного поля. Определяется величинаl π, равнаяl π=2.5, исходя иэ зкспериментальных данных для реакции e+e−→π+X.
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Work partly supported by the INFN.
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Inagaki, H. Structure functions in deep inelastic scattering and in deep inelastic annihilation. Nuov Cim A 33, 555–567 (1976). https://doi.org/10.1007/BF02729871
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DOI: https://doi.org/10.1007/BF02729871