Measurement of single- and double-polarization observables in the photoproduction of $\pi^+\pi^-$~meson pairs off the proton using CLAS at Jefferson Laboratory
Measurement of single- and double-polarization observables in the photoproduction of $\pi^+\pi^-$~meson pairs off the proton using CLAS at Jefferson Laboratory
The photoproduction of $\pi^+\pi^-$ meson pairs off the proton has been studied in the reaction $\gamma p\to p\,\pi^+\pi^-$ using the CEBAF Large Acceptance Spectrometer (CLAS) and the frozen-spin target (FROST) in Hall B at the Thomas Jefferson National Accelerator Facility. For the first time, the beam and target asymmetries, $I^{s,c}$ and $P_{x,y}$, have been measured along with the beam-target double-polarization observables, $P^{s,c}_{x,y}$, using a transversely polarized target with center-of-mass energies ranging from 1.51 GeV up to 2.04 GeV. These data and additional $\pi\pi$ photoproduction observables from CLAS and experiments elsewhere were included in a partial-wave analysis within the Bonn-Gatchina framework. Significant contributions from $s$-channel resonance production are observed in addition to $t$-channel exchange processes. The data indicate significant contributions from $N^\ast$ and $\Delta^\ast$ resonances in the third and fourth resonance regions.
A. Deur、K. Hafidi、I. I. Strakovsky、D. Sokhan、N. Sparveris、M. Spreafico、S. Strauch、R. Tyson、J. A. Tan、N. Trotta、M. Ungaro、M. Tenorio、P. Roy、T. Vittorini、U. Weerasinghe、L. Venturelli、S. Vallarino、H. Voskanyan、D. P. Watts、E. Voutier、X. Wei、L. Xu、N. Zachariou、M. H. Wood、M. Zurek、Z. W. Zhao、C. Salgado、S. Schadmand、A. Schmidt、R. A. Schumacher、Y. G. Sharabian、E. V. Shirokov、S. Shrestha、S. Cao、V. Crede、E. Klempt、V. A. Nikonov、A. V. Sarantsev、V. D. Burkert、V. Mokeev、P. Achenbach、J. S. Alvarado、W. R. Armstrong、H. Atac、H. Avakian、N. A. Baltzell、L. Barion、M. Bashkanov、M. Battaglieri、F. Benmokhtar、A. Bianconi、A. S. Biselli、M. Bondi、F. Bossu、S. Boiarinov、K. -T. Brinkmann、W. J. Briscoe、W. K. Brooks、T. Cao、R. Capobianco、D. S. Carman、P. Chatagnon、G. Ciullo、P. L. Cole、M. Contalbrigo、A. D'Angelo、N. Dashyan、R. DeVita、M. Defurne、S. Diehl、C. Djalali、M. Dugger、R. Dupre、H. Egiyan、A. El Alaoui、L. El Fassi、P. Eugenio、P. Pandey、M. Paolone、L. L. Pappalardo、R. Paremuzyan、E. Pasyuk、S. J. Paul、W. Phelps、N. Pilleux、S. Polcher Rafael、J. Price、Y. Prok、D. Protopopescu、J. Richards、M. Ripani、B. Ritchie、J. Ritman、G. Rosner、P. Rossi、A. A. Rusova、S. Fegan、I. P. Fernando、A. Filippi、G. Gavalian、R. W. Gothe、L. Guo、H. Hakobyan、M. Hattawy、T. B. Hayward、D. Heddle、A. Hobart、M. Holtrop、Y. Ilieva、D. G. Ireland、E. L. Isupov、D. Jenkins、H. Jiang、H. S. Jo、K. Joo、S. Joosten、D. Keller、M. Khandaker、A. Kim、W. Kim、F. J. Klein、V. Klimenko、A. Kripko、V. Kubarovsky、L. Lanza、P. Lenisa、X. Li、K. Livingston、I. J. D. MacGregor、D. Marchand、D. Martiryan、V. Mascagna、D. Matamoros、M. E. McCracken、B. McKinnon、T. Mineeva、C. Munoz Camacho、P. Nadel-Turonski、K. Neupane、D. Nguyen、G. Niculescu、M. Osipenko、A. I. Ostrovidov、M. Ouillon
物理学
A. Deur,K. Hafidi,I. I. Strakovsky,D. Sokhan,N. Sparveris,M. Spreafico,S. Strauch,R. Tyson,J. A. Tan,N. Trotta,M. Ungaro,M. Tenorio,P. Roy,T. Vittorini,U. Weerasinghe,L. Venturelli,S. Vallarino,H. Voskanyan,D. P. Watts,E. Voutier,X. Wei,L. Xu,N. Zachariou,M. H. Wood,M. Zurek,Z. W. Zhao,C. Salgado,S. Schadmand,A. Schmidt,R. A. Schumacher,Y. G. Sharabian,E. V. Shirokov,S. Shrestha,S. Cao,V. Crede,E. Klempt,V. A. Nikonov,A. V. Sarantsev,V. D. Burkert,V. Mokeev,P. Achenbach,J. S. Alvarado,W. R. Armstrong,H. Atac,H. Avakian,N. A. Baltzell,L. Barion,M. Bashkanov,M. Battaglieri,F. Benmokhtar,A. Bianconi,A. S. Biselli,M. Bondi,F. Bossu,S. Boiarinov,K. -T. Brinkmann,W. J. Briscoe,W. K. Brooks,T. Cao,R. Capobianco,D. S. Carman,P. Chatagnon,G. Ciullo,P. L. Cole,M. Contalbrigo,A. D'Angelo,N. Dashyan,R. DeVita,M. Defurne,S. Diehl,C. Djalali,M. Dugger,R. Dupre,H. Egiyan,A. El Alaoui,L. El Fassi,P. Eugenio,P. Pandey,M. Paolone,L. L. Pappalardo,R. Paremuzyan,E. Pasyuk,S. J. Paul,W. Phelps,N. Pilleux,S. Polcher Rafael,J. Price,Y. Prok,D. Protopopescu,J. Richards,M. Ripani,B. Ritchie,J. Ritman,G. Rosner,P. Rossi,A. A. Rusova,S. Fegan,I. P. Fernando,A. Filippi,G. Gavalian,R. W. Gothe,L. Guo,H. Hakobyan,M. Hattawy,T. B. Hayward,D. Heddle,A. Hobart,M. Holtrop,Y. Ilieva,D. G. Ireland,E. L. Isupov,D. Jenkins,H. Jiang,H. S. Jo,K. Joo,S. Joosten,D. Keller,M. Khandaker,A. Kim,W. Kim,F. J. Klein,V. Klimenko,A. Kripko,V. Kubarovsky,L. Lanza,P. Lenisa,X. Li,K. Livingston,I. J. D. MacGregor,D. Marchand,D. Martiryan,V. Mascagna,D. Matamoros,M. E. McCracken,B. McKinnon,T. Mineeva,C. Munoz Camacho,P. Nadel-Turonski,K. Neupane,D. Nguyen,G. Niculescu,M. Osipenko,A. I. Ostrovidov,M. Ouillon.Measurement of single- and double-polarization observables in the photoproduction of $\pi^+\pi^-$~meson pairs off the proton using CLAS at Jefferson Laboratory[EB/OL].(2025-04-29)[2025-05-21].https://arxiv.org/abs/2504.21119.点此复制
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