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Pregled bibliografske jedinice broj: 83377

Zbornik radova

Autori: Passek-Kumerički, Kornelija
Naslov: The leading-twist two gluon distribution amplitude in exclusive processes involving eta and eta' mesons
Izvornik: Mini-proceedings of the Workshop on Spontaneously Broken Chiral Symmetry and Hard QCD-Phenomena / Frankfurt, L. ; Goeke, K. ; Pobylitsa, P. V. ; Polyakov, M. V. ; Strikman, M. ; Weise, W. (ur.). -
Skup: Workshop on Spontaneously Broken Chiral Symmetry and Hard QCD-Phenomena
Mjesto i datum: Bad Honnef, Njemačka, 15.-19.07.2002.
Ključne riječi: eta; eta'; gluon distribution amplitude; quark distribution amplitude; transition form factor
Sažetak:
The brief review of work in progress has been presented. The formalism for treating the leading- twist two-gluon Fock components appearing in hard processes that involve eta and eta' mesons has been reexamined permitting a critical appraisal of the relevant literature. A consistent set of conventions for the definition of the gluon distribution amplitude, the anomalous dimensions as well as the projector of a two-gluon state onto an eta or eta' state has been established. The eta, eta'-photon transition form factor has been calculated to order alpha_s and as a crucial test of the consistency of this set of conventions the cancellation of the collinear and UV singularities has been explicitly shown. An estimate of the lowest Gegenbauer coefficients of the gluon and quark distribution amplitudes has been obtained from a fit to the eta, eta'-photon transition form factor data. The results were applied to chi ->eta eta (eta' eta') decays, deeply virtual electroproduction of eta and \eta' mesons (DVEM) and g^* g^* eta' vertex. While for DVEM the two- gluon contributions are suppressed for small momentum transfer t, for the g^* g^* eta' vertex a significant dependence on gg contributions has been observed.
Vrsta sudjelovanja: Predavanje
Vrsta prezentacije u zborniku: Sažetak
Vrsta recenzije: Međunarodna recenzija
Projekt / tema: 0098002
Izvorni jezik: ENG
Kategorija: Znanstveni
Znanstvena područja:
Fizika
URL Internet adrese: http://arxiv.org/abs/hep-ph/0211291
Napomene:
[arXiv:hep-ph/0211291]



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