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Coupled channel analysis of the ▫$\rho$▫ meson decay in lattice QCDLang, Christian B. ...Z večimi ▫$\overline{q}q$▫ in ▫$\pi \pi$▫ interpolacijskimi polji na mreži, katerih kvantna števila ustrezajo ▫$\rho$▫ resonanci, je na variacijski osnovi določen diskreten energijski spekter v ... končnem volumnu. V elastičnem režimu je ta spekter preko Lüscherjeve formule povezan s faznimi zamiki kontinuumske sipalne amplitude; ta relacija omogoča določitev resonančnih parametrov iz izračunov spektra. Simulacije so izvedene pri treh različnih vrednostih skupne gibalne količine sklopljenega ▫$\overline{q}q - \pi\pi$▫ sistema, s čimer lahko določimo ▫$p$▫-sipalno fazo pri petih različnih vrednostih relativne gibalne količine piona v bližini resonance. Enačba za efektivni doseg lepo opisuje fazne zamike. Sledijo izračuni resonančne mase ▫$m_\rho = 792(7)(8)$▫ MeV in sklopitve ▫$g_{\rho\pi\pi} =5.13(20)$▫ pri naši ▫$m_\pi \simeq 266$▫ MeV. Sklopitev ▫$g_\rho\pi\pi$▫ je neposredno povezana s širino ▫$\rho$▫ mezona. Naša vrednost je blizu tisti, ki sledi iz eksperimentalno določene širine. Simulacije so izvedene z uporabo dinamičnih profilnih konfiguracij z dvema okusoma izboljšanih clover-Wilsonovih fermionov drevesne stopnje z degenerirano maso. Korelacijske funkcije so izračunane z uporabo nedavno predlagane distilacijske metode z Laplace-Heaviside-ovo razmazanostjo kvarkov, kar omogoča fleksibilne izračune, pogosto s prej nevideno natančnostjo.Source: Physical review. D, Particles, fields, gravitation, and cosmology. - ISSN 1550-7998 (Vol. 84, no. 5, 2011, str. 054503-1-054503-13)Type of material - article, component partPublish date - 2011Language - englishCOBISS.SI-ID - 25172775
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source: Physical review. D, Particles, fields, gravitation, and cosmology. - ISSN 1550-7998 (Vol. 84, no. 5, 2011, str. 054503-1-054503-13)
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Database name | Field | Year |
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Lang, Christian B. | ![]() |
Mohler, Daniel | ![]() |
Prelovšek, Saša | 15643 |
Vidmar, Matija, 1988- | 37670 |
Source: Personal bibliographies
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