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Light isovector resonances in pi(-) p -> pi(-) pi(-) pi(+)p at 190 GeV/c
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SYSNO ASEP 0497566 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Light isovector resonances in pi(-) p -> pi(-) pi(-) pi(+)p at 190 GeV/c Tvůrce(i) Aghasyan, M. (IT)
Alexeev, M. G. (DE)
Alexeev, G. D. (RU)
Srnka, Aleš (UPT-D) RID, ORCID, SAICelkový počet autorů 224 Číslo článku 092003 Zdroj.dok. Physical Review D. - : American Physical Society - ISSN 2470-0010
Roč. 98, č. 9 (2018)Poč.str. 72 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova partial-wave analysis ; difractive production ; compass experiment Vědní obor RIV BN - Astronomie a nebeská mechanika, astrofyzika Obor OECD Nuclear physics CEP LO1212 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Institucionální podpora UPT-D - RVO:68081731 UT WOS 000449295300003 EID SCOPUS 85058095967 DOI 10.1103/PhysRevD.98.092003 Anotace We have performed the most comprehensive resonance-model fit of pi(-)pi(-)pi(+) states using the results of our previously published partial-wave analysis (PWA) of a large data set of diffractive-dissociation events from the reaction pi(-) + p -> pi(-)pi(-)pi(+) +p(recoil) with a 190 GeV/c pion beam. The PWA results, which were obtained in 100 bins of three-pion mass, 0.5 < m(3 pi) < 2.5 GeV/c(2), and simultaneously in 11 bins of the reduced four-momentum transfer squared, 0.1 < t'< 1.0 (GeV/c)(2), are subjected to a resonance-model fit using Breit-Wigner amplitudes to simultaneously describe a subset of 14 selected waves using 11 isovector light-meson states with J(PC) = 0(-+), 1(++), 2(++), 2(-+), 4(++), and spin-exotic 1(-+) quantum numbers. The model contains the well-known resonances pi(1800), a(1)(1260), a(2)(1320), pi(2)(1670), pi(2)(1880), and a(4) (2040). In addition, it includes the disputed pi(1)(1600), the excited states a(1)(1640), a2(1700), and pi(2) (2005), as well as the resonancelike a(1)(1420). We measure the resonance parameters mass and width of these objects by combining the information from the PWA results obtained in the 11 t' bins. We extract the relative branching fractions of the rho(770)pi and f(2)(1270)pi decays of a(2)(1320) and a(4)(2040), where the former one is measured for the first time. In a novel approach, we extract the t' dependence of the intensity of the resonances and of their phases. The t' dependence of the intensities of most resonances differs distinctly from the t' dependence of the nonresonant components. For the first time, we determine the t' dependence of the phases of the production amplitudes and confirm that the production mechanism of the Pomeron exchange is common to all resonances. We have performed extensive systematic studies on the model dependence and correlations of the measured physical parameters. Pracoviště Ústav přístrojové techniky Kontakt Martina Šillerová, sillerova@ISIBrno.Cz, Tel.: 541 514 178 Rok sběru 2019
Počet záznamů: 1