Experimental results on the Σ+(1189) hyperon transverse polarization in photoproduction on a hydrogen target using the CLAS detector at Jefferson laboratory are p resented. The Σ+(1189) was reconstructed in the exclusive reaction γ+p→K0S+Σ+(1189) via the Σ+→pπ0 decay mode. The K0S was reconstructed in the invariant mass of two oppositely charged pions with the π0 identified in the missing mass of the detected pπ+π− final state. Experimental data were collected in the photon energy range Eγ= 1.0-3.5 GeV (√s range 1.66-2.73 GeV). We observe a large negative polarization of up to 95%. As the mechanism of transverse polarization of hyperons produced in unpolarized photoproduction experim ents is still not well understood, these results will help to distinguish between different theoretical models o n hyperon production and provide valuable information for the searches of missing baryon resonances.
Transverse polarization of Sigma(+)(1189) in photoproduction on a hydrogen target in CLAS
CONTALBRIGO, Marco;PAPPALARDO, Luciano Libero;
2013
Abstract
Experimental results on the Σ+(1189) hyperon transverse polarization in photoproduction on a hydrogen target using the CLAS detector at Jefferson laboratory are p resented. The Σ+(1189) was reconstructed in the exclusive reaction γ+p→K0S+Σ+(1189) via the Σ+→pπ0 decay mode. The K0S was reconstructed in the invariant mass of two oppositely charged pions with the π0 identified in the missing mass of the detected pπ+π− final state. Experimental data were collected in the photon energy range Eγ= 1.0-3.5 GeV (√s range 1.66-2.73 GeV). We observe a large negative polarization of up to 95%. As the mechanism of transverse polarization of hyperons produced in unpolarized photoproduction experim ents is still not well understood, these results will help to distinguish between different theoretical models o n hyperon production and provide valuable information for the searches of missing baryon resonances.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.