Measurement of the [e.sup.+][e.sup.-] → η[π.sup.+][π.sup.-] cross section in the center-of-mass energy range 1.22-2.00 GeV with the SND detector at the VEPP-2000 collider

• Published in: Physics of atomic nuclei 2015-12, p.1478
• Main Author: Shtol, D.A
• Format: Article
• Language: English
• Subjects: Comparative analysis; Detectors; Measurement
• ISSN: 1063-7788; 1562-692X
• DOI: 10.1134/S1063778815130323

In the experiment with the SND detector at the VEPP-2000 [e.sup.+][e.sup.-] collider the cross section for the process [e.sup.+][e.sup.-] → η[π.sup.+][π.sup.-] has been measured in the center-of-mass energy range from 1.22 to 2.00 GeV. Obtained results are in agreement with previous measurements and have better accuracy. The energy dependence of the [e.sup.+][e.sup.-] → η[π.sup.+][π.sup.-] cross section has been fitted with the vector-meson dominance model. From this fit the product of the branching fractions B(ρ(1450) → η[π.sup.+][π.sup.-])B(ρ(1450) → [e.sup.+][e.sup.-]) has been extracted and compared with the same products for ρ(1450) [right arrow] ω[π.sup.0] and ρ(1450) → [φ.sup.+] [φ.sup.-] decays. The obtained cross section data have been also used to test the conservation of vector current hypothesis.