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On the instanton-induced portion of the nucleon strangeness


Klabučar, Dubravko; Kumerički, Krešimir; Melić, Blaženka; Picek, Ivica
On the instanton-induced portion of the nucleon strangeness // European physical journal C, 9 (1999), 4; 589-599 doi:10.1007/s100529900056 (međunarodna recenzija, članak, znanstveni)


Naslov
On the instanton-induced portion of the nucleon strangeness

Autori
Klabučar, Dubravko ; Kumerički, Krešimir ; Melić, Blaženka ; Picek, Ivica

Izvornik
European physical journal C (1434-6044) 9 (1999), 4; 589-599

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Nucleon; instantons; strangeness; MIT-bag model

Sažetak
We calculate the instanton contribution to the proton strangeness in the MIT bag enriched by the presence of a dilute instanton liquid. The evaluation is based on expressing the nucleon matrix elements of bilinear strange quark operators in terms of a model valence nucleon state and interactions producing quark-antiquark fluctuations on top of that valence state. Our method combines the usage of the evolution operator containing a strangeness source, and the Feynman-Hellmann theorem. It enables one to evaluate the strangeness in different Lorentz channels in, essentially, the same way. Only the scalar channel is found to be affected by the interaction induced by the random instanton liquid.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Projekt / tema
00980102
119222

Ustanove
Institut "Ruđer Bošković", Zagreb,
Prirodoslovno-matematički fakultet, Zagreb

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


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