학술논문
Isoscalar single-pion production in the region of Roper and d⁎(2380) resonances
Document Type
article
Author
P. Adlarson; W. Augustyniak; W. Bardan; M. Bashkanov; F.S. 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.-O. Gullström; L. Heijkenskjöld; V. Hejny; N. Hüsken; L. Jarczyk; T. Johansson; B. Kamys; G. Kemmerling; G. Khatri; A. Khoukaz; O. Khreptak; D.A. 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.-P. Morsch; P. Moskal; H. Ohm; W. Parol; E. Perez del Rio; N.M. Piskunov; D. Prasuhn; D. Pszczel; K. Pysz; A. Pyszniak; J. Ritman; A. Roy; Z. Rudy; O. Rundel; S. Sawant; S. Schadmand; I. Schätti-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.J. Zieliński; J. Złomańczuk; P. Żuprański; M. Żurek
Source
Physics Letters B, Vol 774, Iss C, Pp 599-607 (2017)
Subject
Language
English
ISSN
0370-2693
1873-2445
1873-2445
Abstract
Exclusive measurements of the quasi-free pn→ppπ− and pp→ppπ0 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 Δ(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 Δ 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.