On the Possibility of Observing a{sup 0}{sub 0}(980) - f{sub 0}(980) Mixing in the Reaction {pi}{sup -}p {yields} {eta}{pi}{sup 0}n on a Polarized Target

It is shown that the spin asymmetry in the reaction {pi}{sup -}p {yields} a{sup 0}{sub 0}(980)n {yields} ({eta}{pi}{sup 0}){sub S} n is highly sensitive to the mixing of the a{sup 0}{sub 0}(980) and f{sub 0}(980) resonances. At low momentum transfers (namely, in any of the intervals 0 {<=} -t {&l...

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Bibliographic Details
Published inPhysics of atomic nuclei Vol. 68; no. 12
Main Authors Achasov, N.N., Shestakov, G.N.
Format Journal Article
LanguageEnglish
Published United States 01.12.2005
Subjects
A0-980 MESONS
ASYMMETRY
D S MESONS
ENERGY DEPENDENCE
ETA MESONS
F0-980 MESONS
GEV RANGE
MOMENTUM TRANSFER
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
PION MINUS REACTIONS
PION MINUS-PROTON INTERACTIONS
PIONS MINUS
PIONS NEUTRAL
POLARIZATION
POLARIZED TARGETS
QUANTUM CHROMODYNAMICS
SPIN
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Summary:It is shown that the spin asymmetry in the reaction {pi}{sup -}p {yields} a{sup 0}{sub 0}(980)n {yields} ({eta}{pi}{sup 0}){sub S} n is highly sensitive to the mixing of the a{sup 0}{sub 0}(980) and f{sub 0}(980) resonances. At low momentum transfers (namely, in any of the intervals 0 {<=} -t {<=} 0.025, ..., 0.1 GeV{sup 2}), the asymmetry normalized in such a way that it takes values between -1 and 1 must undergo a jump close in magnitude to unity in the region of the {eta}{pi}{sup 0} invariant masses between 0.965 and 1.01 GeV. A large jump of the asymmetry is due exclusively to a{sup 0}{sub 0}(980) - f{sub 0}(980) mixing. A very high resolution in the {eta}{pi}{sup 0} invariant mass is not required for observing the jump of the asymmetry. The energy dependence of the polarization effect is expected to be rather weak; therefore, the polarization effect in question can be studied at any high energy--for example, in the range between 8 and 100 GeV.
ISSN:1063-7788
1562-692X
DOI:10.1134/1.2149086