Measurement of Form Factors for the Decay {eta}{sup '} {yields} {eta}{pi}{sup -}{pi}{sup +}

• Published in: Physics of atomic nuclei Vol. 68; no. 3
• Main Authors: Amelin, D.V., Gavrilov, Yu.G., Gouz, Yu.P., Dorofeev, V.A., Dzhelyadin, R.I., Zaitsev, A.M., Zenin, A.V., Ivashin, A.V., Kachaev, I.A., Kabachenko, V.V., Karyukhin, A.N., Konoplyannikov, A.N., Konstantinov, V.F., Kostyukhin, V.V., Matveev, V.D., Nikolaenko, V.I., Ostankov, A.P., Polyakov, B.F., Ryabchikov, D.I., Solodkov, A.A.
• Format: Journal Article
• Language: English
• Published: United States 01.03.2005
• Subjects: C INVARIANCE; DALITZ PLOT; ETA MESONS; FORM FACTORS; GEV RANGE; HADRONIC PARTICLE DECAY; MATRIX ELEMENTS; NONLINEAR PROBLEMS; PARTICLE PRODUCTION; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; PION-NUCLEON INTERACTIONS; PIONS MINUS; PIONS PLUS; RESONANCE PARTICLES
• ISSN: 1063-7788; 1562-692X
• DOI: 10.1134/1.1891186

Form factors measured for the decay {eta}{sup '} {yields} {eta}{pi}{sup -}{pi}{sup +} in {pi}{sup -}A {yields} {eta}{sup '}{pi}{sup -}A{sup *} reactions at a beam momentum of p{sub {pi}} = 28 GeV are presented. The distribution in Dalitz variables for 7000 decay events is described well within a linear and a nonlinear parametrization of the relevant matrix element. The slope parameter in the variable y differs from zero significantly. It is Re{alpha} = -0.072 {+-} 0.012(stat.) {+-} 0.006(syst.) in the linear and a = -0.120 {+-} 0.027(stat.) {+-} 0.015(syst.) in the nonlinear parametrization. In this decay, the C-violation parameter is compatible with zero, c = 0.021 {+-} 0.024.