1 4 O ct 2 01 7 Isoscalar Single-Pion Production in the Region of Roper and d ∗ ( 2380 ) Resonances The WASA-at-COSY Collaboration

P. Adlarson,W. Augustyniak,W. Bardan,M. Bashkanov,F. Bergmann,M. Berłowski,H. Bhatt,A. Bondar,M. Büscher,H. Calén,I. Ciepał,H. Clement,E. Czerwiński,K. Demmich,R. Engels,A. Erven,W. Erven,W. Eyrich,P. Fedorets,K. Föhl,K. Fransson,F. Goldenbaum,A. Goswami,K. Grigoryev,C. Gullström,L. Heijkenskjöld,V. Hejny,N. Hüsken,L. Jarczyk,T. Johansson,B. Kamys,G. Kemmerling,G. Khatri,A. Khoukaz,O. Khreptak,D. Kirillov,S. Kistryn,H. Kleines,B. Kłos, W. Krzemień,P. Kulessa,A. Kupść,A. Kuzmin,K. Lalwani,D. Lersch,B. Lorentz,A. Magiera,R. Maier,P. Marciniewski,B. Mariański,H. Morsch,P. Moskal,H. Ohm,W. Parol,E. Pérez,Del Rio,N. Piskunov,D. Prasuhn,D. Pszczel,K. Pysz,A. Pyszniak,J. Ritman,A. Roy,Z. Rudy,O. Rundel,S. Sawant,S. Schadmand,I. Ozerianska,T. Sefzick,V. Serdyuk,B. Shwartz,K. Sitterberg,T. Skorodko,M. Skurzok,J. Smyrski,V. Sopov,R. Stassen,J. Stepaniak,E. Stephan,G. Sterzenbach,H. Stockhorst,H. Ströher,A. Szczurek,A. Trzciński,R. Varma,M. Wolke,A. Wrońska,P. Wüstner,A. Yamamoto,J. Zabierowski,M. Zielinski,J. Zlomanczuk,P. Żupránski,M. Zurek

semanticscholar（2017）

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摘要

Exclusive measurements of the quasi-free pn→ ppπ and pp→ ppπ reactions have been performed by means of pd collisions at Tp = 1.2 GeV using the WASA detector setup at COSY. Total and differential cross sections have been obtained covering the energy region Tp = 0.95 − 1.3 GeV ( √ s = 2.3 2.46 GeV), which includes the regions of ∆(1232), N(1440) and d(2380) resonance excitations. From these measurements the isoscalar single-pion production has been extracted, for which data existed so far only below Tp = 1 GeV. We observe a substantial increase of this cross section around 1 GeV, which can be related to the Roper resonance N(1440), the strength of which shows up isolated from the ∆ resonance in the isoscalar (Nπ)I=0 invariant-mass spectrum. No evidence for a decay of the dibaryon resonance d(2380) into the isoscalar (NNπ)I=0 channel is found. An upper limit of 180 μb (90 % C.L.) corresponding to a branching ratio of 9 % has been deduced.

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