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| Dokumentenart: | Artikel |
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| Titel eines Journals oder einer Zeitschrift: | The European Physical Journal C |
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| Verlag: | SPRINGER |
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| Ort der Veröffentlichung: | NEW YORK |
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| Band: | 71 |
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| Nummer des Zeitschriftenheftes oder des Kapitels: | 4 |
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| Datum: | 2011 |
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| Institutionen: | Physik > Institut für Theoretische Physik |
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| Identifikationsnummer: | | Wert | Typ |
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| 10.1140/epjc/s10052-011-1623-4 | DOI |
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| Stichwörter / Keywords: | PION DISTRIBUTION AMPLITUDE; GAMMA-GAMMA-ASTERISK; RARE DECAYS P; EXCLUSIVE PROCESSES; PERTURBATIVE APPROACH; SUDAKOV SUPPRESSION; TRANSVERSE-MOMENTUM; HEAVY MESONS; QCD; ANNIHILATION; |
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| Dewey-Dezimal-Klassifikation: | 500 Naturwissenschaften und Mathematik > 530 Physik |
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| Status: | Veröffentlicht |
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| Begutachtet: | Ja, diese Version wurde begutachtet |
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| An der Universität Regensburg entstanden: | Ja |
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| Dokumenten-ID: | 65037 |
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Zusammenfassung
The form factors for the transitions pi gamma, eta gamma, eta'gamma and eta(c)gamma are analyzed within the modified perturbative approach in which quark transverse degrees of freedom are retained. The results for the form factors are compared to experiment in detail. As compared to previous calculations within the same approach only little modifications of the meson distribution amplitudes are ...
Zusammenfassung
The form factors for the transitions pi gamma, eta gamma, eta'gamma and eta(c)gamma are analyzed within the modified perturbative approach in which quark transverse degrees of freedom are retained. The results for the form factors are compared to experiment in detail. As compared to previous calculations within the same approach only little modifications of the meson distribution amplitudes are required in general in order to achieve reasonable agreement with experiment. Only for the pi gamma form factor a strong contribution from the second Gegenbauer term is found. It also commented on the case of two virtual photons and on the transition form factors in the time-like region.
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