η and η′ mesons in the Dyson-Schwinger approach at finite temperature

Znanstveni rad - Izvorni znanstveni rad

• Autor: Davor Horvatić
• Autor: Dubravko Klabučar
• Autor: A. E. Radzhabov
• Autorova ustanova: Sveučilište u Zagrebu; Prirodoslovno-matematički fakultet; (Fizički odsjek)
• Znanstveno / umjetničko područje, polje i grana: PRIRODNE ZNANOSTI; Fizika

Sažetak (engleski)

We study the temperature dependence of the pseudoscalar meson properties in a relativistic bound-state approach exhibiting the chiral behavior mandated by QCD. Concretely, we adopt the Dyson-Schwinger approach with a rank-2 separable model interaction. After extending the model to the strange sector and fixing its parameters at zero temperature, T=0, we study the T-dependence of the masses and decay constants of all ground-state mesons in the pseudoscalar nonet. Of chief interest are η and η'. The influence of the QCD axial anomaly on them is successfully obtained through the Witten-Veneziano relation at T=0. The same approach is then extended to T>0, using lattice QCD results for the topological susceptibility. The most conspicuous finding is an increase of the η' mass around the chiral restoration temperature T_Ch, which would suggest a suppression of η' production in relativistic heavy-ion collisions. The increase of the η' mass may also indicate that the extension of the Witten-Veneziano relation to finite temperatures becomes unreliable around and above T_Ch. Possibilities of an improved treatment are discussed.

• Ključne riječi (engleski): QCD; Dyson-Schwinger; Bethe-Salpeter; finite temperature; pseudoscalar mesons
• 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, Fields, Gravitation and Cosmology
• Brojčani podaci: vol. 76, br. 9, 096009
• p-ISSN: 1550-7998
• e-ISSN: 1550-2368
• DOI: https://doi.org/10.1103/PhysRevD.76.096009
• URN:NBN: urn:nbn:hr:217:480454
• Datum objave publikacije: 2007
• Projekt: Šifra: 119-0982930-1016; Naziv (hrvatski): Elementarne čestice, teorija polja i kozmologija; Voditelj: Ivica Picek; Pravna nadležnost: Hrvatska; Financijer: MZOS; Linija financiranja: ZP
• URL dokumenta: http://link.aps.org/doi/10.1103/PhysRevD.76.096009
• Vrsta resursa: Tekst
• Prava pristupa: Otvoreni pristup
• Javna napomena: Copyright (2007) by the American Physical Society. Received 10 August 2007; published 29 November 2007.
• Datum i vrijeme pohrane: 2019-10-18 15:41:57