Beam-target helicity asymmetry $E$ in $K^{0}\Lambda$ and $K^{0}\Sigma^0$ photoproduction on the neutron

D.H. Ho , R.A. Schumacher , A. d'Angelo , A. Deur , J. Fleming , C. Hanretty , T. Kageya , F.J. Klein , E. Klempt , M.M. Lowry , H. Lu , V.A. Nikonov , P. Peng , A.M. Sandorfi , A.V. Sarantsev , I.I. Strakovsky , N.K. Walford , X. Wei , R.L. Workman , K.P. Adhikari , S. Adhikari , D. Adikaram , Z. Akbar , J. Ball (1) , L. Barion , M. Bashkanov , C.D. Bass , M. Battaglieri , I. Bedlinskiy , A.S. Biselli , W.J. Briscoe , S. Boiarinov , V.D. Burkert , F. Cao , D.S. Carman , A. Celentano , S. Chandavar , G. Charles (2) , P. Chatagnon (2) , T. Chetry , G. Ciullo , B.A. Clary , P. Cole , P. Collins , M. Contalbrigo , V. Crede , R. de Vita , M. Defurne (1) , S. Diehl , C. Djalali , R. Dupre (2, 1) , H. Egiyan , M. Ehrhart (2) , A. El Alaoui , L. El Fassi , P. Eugenio , G. Fedotov , S. Fegan , R. Fersch , A. Filippi , A. Fradi (2) , Y. Ghandilyan , K.L. Giovanetti , F.X. Girod , W. Gohn , E. Golovatch , R.W. Gothe , K.A. Griffioen , M. Guidal (2) , K. Hafidi , H. Hakobyan , N. Harrison , M. Hattawy , D. Heddle , K. Hicks , M. Holtrop , Y. Ilieva , D.G. Ireland , B.S. Ishkhanov , E.L. Isupov , D. Jenkins , H.S. Jo , S. Johnston , M.L. Kabir , D. Keller , G. Khachatryan , M. Khachatryan , M. Khandaker , A. Kim , W. Kim , A. Klein , V. Kubarovsky , V. Laine (3) , L. Lanza , P. Lenisa , K. Livingston , I.. J . D. Macgregor , D. Marchand (2) , N. Markov , M. Mayer , B. Mckinnon , C.A. Meyer , M. Mirazita , V. Mokeev , R.A. Montgomery , A. Movsisyan , C. Munoz Camacho (2) , P. Nadel-Turonski , S. Niccolai (2) , G. Niculescu , T. O'Connell , M. Osipenko , A.I. Ostrovidov , M. Paolone , R. Paremuzyan , K. Park , E. Pasyuk , O. Pogorelko , J.W. Price , Y. Prok , D. Protopopescu , M. Rehfuss , M. Ripani , D. Riser , A. Rizzo , G. Rosner , F. Sabatié (1) , C. Salgado , Y.G. Sharabian , Iu. Skorodumina , G.D. Smith , D.I. Sober , D. Sokhan , N. Sparveris , S. Strauch , M. Taiuti , J.A. Tan , M. Ungaro , H. Voskanyan , E. Voutier (2) , R. Wang (2) , D.P. Watts , L.B. Weinstein , C.S. Whisnant , M.H. Wood , N. Zachariou , J. Zhang , Z.W. Zhao , I. Zonta

1 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
2 IPNO - Institut de Physique Nucléaire d'Orsay
3 LPC - Laboratoire de Physique de Clermont

We report the first measurements of the E beam-target helicity asymmetry for the γ⃗n⃗→K0Λ and K0Σ0 channels in the energy range 1.70≤W≤2.34 GeV. The CLAS system at Jefferson Lab uses a circularly polarized photon beam and a target consisting of longitudinally polarized solid molecular hydrogen deuteride with low background contamination for the measurements. The multivariate analysis method boosted decision trees is used to isolate the reactions of interest. Comparisons with predictions from the KaonMAID, SAID, and Bonn-Gatchina models are presented. These results will help separate the isospin I=0 and I=1 photocoupling transition amplitudes in pseudoscalar meson photoproduction.

Mots clés: Hadronic Physics and QCD; helicity: asymmetry; beam: asymmetry; pseudoscalar meson: photoproduction; background: low; photon: beam; Jefferson Lab; hydrogen: target; isospin: dependence; CLAS; experimental results; differential cross section; n: target

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

D.H. Ho, R.A. Schumacher, A. d'Angelo, A. Deur, J. Fleming, et al.. Beam-target helicity asymmetry $E$ in $K^{0}\Lambda$ and $K^{0}\Sigma^0$ photoproduction on the neutron. Phys.Rev.C, 2018, 98 (4), pp.045205. ⟨10.1103/PhysRevC.98.045205⟩. ⟨hal-01801901⟩