Measurement of the photon beam asymmetry in (gamma)over-right-arrowp -> K+Sigma(0) at E-gamma=8 . 5 GeV

S. Adhikari,A. Ali,M. Amaryan,A. Austregesilo,F. Barbosa,J. Barlow,E. Barriga,R. Barsotti,T. D. Beattie,V. V. Berdnikov,T. Black,W. Boeglin,W. J. Briscoe,T. Britton, W. K. Brooks,B. E. Cannon,N. Cao,E. Chudakov,S. Cole,O. Cortes,V Crede,M. M. Dalton,T. Daniels,A. Deur,S. Dobbs,A. Dolgolenko,R. Dotel,M. Dugger,R. Dzhygadlo,H. Egiyan,T. Erbora,A. Ernst,P. Eugenio,C. Fanelli,S. Fegan,A. M. Foda,J. Foote,J. Frye,S. Furletov,L. Gan,A. Gasparian,C. Gleason,K. Goetzen,A. Goncalves,V. S. Goryachev,L. Guo,H. Hakobyan,A. Hamdi,G. M. Huber,A. Hurley,D. G. Ireland,M. M. Ito,N. S. Jarvis,R. T. Jones,V Kakoyan,G. Kalicy,M. Kamel,C. Kourkoumelis,S. Kuleshov,I Larin,D. Lawrence,I Lersch D.,H. Li,W. Li,B. Liu,K. Livingston,G. J. Lolos,V Lyubovitskij,D. Mack,H. Marukyan,V Matveev,M. McCaughan,M. McCracken,W. McGinley,C. A. Meyer,R. Miskimen,R. E. Mitchell,F. Nerling,L. Ng,H. Ni,I Ostrovidov A.,Z. Papandreou,M. Patsyuk,C. Paudel,P. Pauli,R. Pedroni,L. Pentchev,K. J. Peters,W. Phelps,E. Pooser,N. Qin,J. Reinhold,B. G. Ritchie,L. Robison,D. Romanov,C. Romero,C. Salgado,A. M. Schertz,R. A. Schumacher,J. Schwiening,K. K. Seth,X. Shen,M. R. Shepherd,E. S. Smith,I Sober D.,A. Somov,S. Somov,O. Soto,J. R. Stevens,I. I. Strakovsky,K. Suresh,V. V. Tarasov,S. Taylor,A. Teymurazyan,A. Thiel,G. Vasileiadis,T. Whitlatch,N. Wickramaarachchi,M. Williams,T. Xiao,Y. Yang,J. Zarling,Z. Zhang,Q. Zhou,X. Zhou,B. Zihlmann

PHYSICAL REVIEW C（2020）

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摘要

We report measurements of the photon beam asymmetry Sigma for the reaction (gamma) over right arrowp -> K+Sigma(0) (1193) using the GlueX spectrometer in Hall D at Jefferson Lab. Data were collected by using a linearly polarized photon beam in the energy range of 8.2-8.8 GeV incident on a liquid hydrogen target. The beam asymmetry Sigma was measured as a function of the Mandelstam variable t, and a single value of Sigma was extracted for events produced in the u channel. These are the first exclusive measurements of the photon beam asymmetry Sigma for the reaction in this energy range. For the t channel, the measured beam asymmetry is close to unity over the t range studied, -t = (0 .1-1 .4) (GeV/c)(2) , with an average value of Sigma = 1 .00 +/- 0 .05. This agrees with theoretical models that describe the reaction via the natural-parity exchange of the K*(892) Regge trajectory. A value of Sigma = 0 .41 +/- 0 .09 is obtained for the u channel integrated up to -u = 2 .0 (GeV/c)(2).

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