Quark loop calculation of the γ → 3π form factor

Znanstveni rad - Izvorni znanstveni rad

• Autor: Bojan Bistrović
• Autor: Dubravko Klabučar
• Autorova ustanova: Sveučilište u Zagrebu; Prirodoslovno-matematički fakultet; (Fizički odsjek)
• Znanstveno / umjetničko područje, polje i grana: PRIRODNE ZNANOSTI; Fizika

Sažetak (engleski)

The presently experimentally interesting form factor for the anomalous process γ → π+π0π- is calculated as the quark “box” amplitude where the intermediate fermion loop is the one of constituent quarks with the pseudoscalar coupling to pions. This also corresponds to the form factor, in the lowest order in pion interactions, of the σ model and of the chiral quark model. We give the analytic expression for the form factor in terms of an expansion in the pion momenta up to the order O(p8) relative to the soft point result, and also perform its exact numerical evaluation. We compare our predictions with those of vector meson dominance and chiral perturbation theory, as well as with the scarce data available so far.

• Ključne riječi (engleski): axial anomaly; quark loops; box graph; constituent quarks
• Jezik: engleski
• Vrsta publikacije: Znanstveni rad - Izvorni znanstveni rad
• Status objave: Objavljen
• Vrsta recenzije: Recenziran - međunarodna recenzija
• Verzija publikacije: Objavljena verzija rada (izdavačev PDF)
• Naslov časopisa: Physical Review D, Particles and fields
• Brojčani podaci: vol. 61, br. 3, str. 33006-1
• p-ISSN: 0556-2821
• DOI: https://doi.org/10.1103/PhysRevD.61.033006
• URN:NBN: urn:nbn:hr:217:352165
• Datum objave publikacije: 2000
• URL dokumenta: http://dx.doi.org/10.1103/PhysRevD.61.033006
• Vrsta resursa: Tekst
• Prava pristupa: Otvoreni pristup
• Javna napomena: Copyright (2000) by the American Physical Society.
• Datum i vrijeme pohrane: 2019-10-10 17:42:25