The f(1)(1285) meson withmass 1281.0 +/- 0.8MeV/c(2) and width 18.4 +/- 1.4MeV (full width at half maximum) was measured for the first time in photoproduction from a proton target using CLAS at Jefferson Lab. Differential cross sections were obtained via the eta pi(+)pi(-), K+(K) over bar (0) pi(-), and (K-K0)pi(+) decay channels from threshold up to a center-of-mass energy of 2.8 GeV. The mass, width, and an amplitude analysis of the eta pi(+)pi(-) final-state Dalitz distribution are consistent with the axial-vector J(P) = 1(+) f(1)(1285) identity, rather than the pseudoscalar 0(-) eta(1295). The production mechanism is more consistent with s-channel decay of a high-mass N* state and not with t-channel meson exchange. Decays to eta pi pi go dominantly via the intermediate a(0)(+/-) (980)pi(-/+) states, with the branching ratio Gamma [a(0)pi (no (K) over barK)]/Gamma[eta pi pi (all)] = 0.74 +/- 0.09. The branching ratios Gamma (K (K) over bar pi)/Gamma(eta pi pi) = 0.216 +/- 0.033 and Gamma (gamma rho(0))/Gamma(eta pi pi) = 0.047 +/- 0.018 were also obtained. The first is in agreement with previous data for the f(1)(1285), while the latter is lower than the world average.

Dickson, R., Schumacher, R., Adhikari, K., Akbar, Z., Amaryan, M., Anefalos Pereira, S., et al. (2016). Photoproduction of the f1(1285) meson. PHYSICAL REVIEW C, 93(6) [10.1103/PhysRevC.93.065202].

Photoproduction of the f1(1285) meson

COLANERI, LUCA;D'ANGELO, ANNALISA;Lanza, L;PISANO, SILVIA;RIZZO, ALESSANDRO;ZONTA, IRENE
2016-06-06

Abstract

The f(1)(1285) meson withmass 1281.0 +/- 0.8MeV/c(2) and width 18.4 +/- 1.4MeV (full width at half maximum) was measured for the first time in photoproduction from a proton target using CLAS at Jefferson Lab. Differential cross sections were obtained via the eta pi(+)pi(-), K+(K) over bar (0) pi(-), and (K-K0)pi(+) decay channels from threshold up to a center-of-mass energy of 2.8 GeV. The mass, width, and an amplitude analysis of the eta pi(+)pi(-) final-state Dalitz distribution are consistent with the axial-vector J(P) = 1(+) f(1)(1285) identity, rather than the pseudoscalar 0(-) eta(1295). The production mechanism is more consistent with s-channel decay of a high-mass N* state and not with t-channel meson exchange. Decays to eta pi pi go dominantly via the intermediate a(0)(+/-) (980)pi(-/+) states, with the branching ratio Gamma [a(0)pi (no (K) over barK)]/Gamma[eta pi pi (all)] = 0.74 +/- 0.09. The branching ratios Gamma (K (K) over bar pi)/Gamma(eta pi pi) = 0.216 +/- 0.033 and Gamma (gamma rho(0))/Gamma(eta pi pi) = 0.047 +/- 0.018 were also obtained. The first is in agreement with previous data for the f(1)(1285), while the latter is lower than the world average.
6-giu-2016
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/04 - FISICA NUCLEARE E SUBNUCLEARE
English
Con Impact Factor ISI
ETA-PI+PI-SYSTEM; CENTRAL PP INTERACTIONS; 450 GEV/C; PSEUDOSCALAR RESONANCES; AXIAL-VECTOR; F(1) 1285; CLAS; CHANNEL; SPIN; COLLISIONS
CLAS Collaboration
https://link.aps.org/accepted/10.1103/PhysRevC.93.065202
Dickson, R., Schumacher, R., Adhikari, K., Akbar, Z., Amaryan, M., Anefalos Pereira, S., et al. (2016). Photoproduction of the f1(1285) meson. PHYSICAL REVIEW C, 93(6) [10.1103/PhysRevC.93.065202].
Dickson, R; Schumacher, R; Adhikari, K; Akbar, Z; Amaryan, M; Anefalos Pereira, S; Badui, R; Ball, J; Battaglieri, M; Batourine, V; Bedlinskiy, I; Bis...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/173665
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