Isospin decomposition of the basic double-pionic fusion in the region of the ABC effect

P. Adlarson; W. Augustyniak; W. Bardan; M. Bashkanov; T. Bednarski; F. S. Bergmann; M. Berłowski; H. Bhatt; M. Buscher; H. Calen; H. Clement; D. Coderre; E. Czerwiński; K. Demmich; E. Doroshkevich; R. Engels; W. Erven; W. Eyrich; P. Fedorets; K. Fohl; K. Fransson; F. Goldenbaum; P. Goslawski; A. Goswami; K. Grigoryev; C. O. Gullstrom; F. Hauenstein; L. Heijkenskjold; V. Hejny; F. Hinterberger; M. Hodana; B. Hoistad; A. Jany; B. R. Jany; L. Jarczyk; T. Johansson; B. Kamys; G. Kemmerling; F. A. Khan; A. Khoukaz; S. Kistryn; J. Klaja; H. Kleines; B. Kłos; M. Krapp; W. Krzemień; P. Kulessa; A. Kupść; K. Lalwani; D. Lersch; WASA-At-COSY Collaboration

doi:10.1016/j.physletb.2013.03.019

Isospin decomposition of the basic double-pionic fusion in the region of the ABC effect

P. Adlarson, W. Augustyniak, W. Bardan, M. Bashkanov, T. Bednarski, F. S. Bergmann, M. Berłowski, H. Bhatt, M. Buscher, H. Calen, H. Clement^*, D. Coderre, E. Czerwiński, K. Demmich, E. Doroshkevich, R. Engels, W. Erven, W. Eyrich, P. Fedorets, K. FohlK. Fransson, F. Goldenbaum, P. Goslawski, A. Goswami, K. Grigoryev, C. O. Gullstrom, F. Hauenstein, L. Heijkenskjold, V. Hejny, F. Hinterberger, M. Hodana, B. Hoistad, A. Jany, B. R. Jany, L. Jarczyk, T. Johansson, B. Kamys, G. Kemmerling, F. A. Khan, A. Khoukaz, S. Kistryn, J. Klaja, H. Kleines, B. Kłos, M. Krapp, W. Krzemień, P. Kulessa, A. Kupść, K. Lalwani, D. Lersch, WASA-At-COSY Collaboration

^*Corresponding author for this work

Physics

Research output: Contribution to journal › Article › peer-review

Abstract

Exclusive and kinematically complete high-statistics measurements of the basic double-pionic fusion reactions pn→dπ0π0, pn→dπ+π- and pp→dπ+π0 have been carried out simultaneously over the energy region of the ABC effect using the WASA detector setup at COSY. Whereas the isoscalar reaction part given by the dπ0π0 channel exhibits the ABC effect, i.e. a low-mass enhancement in the ππ- invariant mass distribution, as well as the associated resonance structure in the total cross section, the isovector part given by the dπ+π0 channel shows a smooth behavior consistent with the conventional tchannel Δ Δ process. The dπ+π- data are very well reproduced by combining the data for isovector and isoscalar contributions, if the kinematical consequences of the isospin violation due to different masses for charged and neutral pions are taken into account.

Original language	English
Pages (from-to)	229-236
Number of pages	8
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	721
Issue number	4-5
DOIs	https://doi.org/10.1016/j.physletb.2013.03.019
Publication status	Published - 25 Apr 2013

Keywords

ABC effect and resonance structure
Double pion production
Isospin decomposition

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Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bednarski, T., Bergmann, F. S., Berłowski, M., Bhatt, H., Buscher, M., Calen, H., Clement, H., Coderre, D., Czerwiński, E., Demmich, K., Doroshkevich, E., Engels, R., Erven, W., Eyrich, W., Fedorets, P., ... WASA-At-COSY Collaboration (2013). Isospin decomposition of the basic double-pionic fusion in the region of the ABC effect. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 721(4-5), 229-236. https://doi.org/10.1016/j.physletb.2013.03.019

@article{254f1ab9a6a644a0b00b43978e49468e,

title = "Isospin decomposition of the basic double-pionic fusion in the region of the ABC effect",

abstract = "Exclusive and kinematically complete high-statistics measurements of the basic double-pionic fusion reactions pn→dπ0π0, pn→dπ+π- and pp→dπ+π0 have been carried out simultaneously over the energy region of the ABC effect using the WASA detector setup at COSY. Whereas the isoscalar reaction part given by the dπ0π0 channel exhibits the ABC effect, i.e. a low-mass enhancement in the ππ- invariant mass distribution, as well as the associated resonance structure in the total cross section, the isovector part given by the dπ+π0 channel shows a smooth behavior consistent with the conventional tchannel Δ Δ process. The dπ+π- data are very well reproduced by combining the data for isovector and isoscalar contributions, if the kinematical consequences of the isospin violation due to different masses for charged and neutral pions are taken into account.",

keywords = "ABC effect and resonance structure, Double pion production, Isospin decomposition",

author = "P. Adlarson and W. Augustyniak and W. Bardan and M. Bashkanov and T. Bednarski and Bergmann, {F. S.} and M. Ber{\l}owski and H. Bhatt and M. Buscher and H. Calen and H. Clement and D. Coderre and E. Czerwi{\'n}ski and K. Demmich and E. Doroshkevich and R. Engels and W. Erven and W. Eyrich and P. Fedorets and K. Fohl and K. Fransson and F. Goldenbaum and P. Goslawski and A. Goswami and K. Grigoryev and Gullstrom, {C. O.} and F. Hauenstein and L. Heijkenskjold and V. Hejny and F. Hinterberger and M. Hodana and B. Hoistad and A. Jany and Jany, {B. R.} and L. Jarczyk and T. Johansson and B. Kamys and G. Kemmerling and Khan, {F. A.} and A. Khoukaz and S. Kistryn and J. Klaja and H. Kleines and B. K{\l}os and M. Krapp and W. Krzemie{\'n} and P. Kulessa and A. Kup{\'s}{\'c} and K. Lalwani and D. Lersch and {WASA-At-COSY Collaboration}",

year = "2013",

month = apr,

day = "25",

doi = "10.1016/j.physletb.2013.03.019",

language = "English",

volume = "721",

pages = "229--236",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier",

number = "4-5",

}

Adlarson, P, Augustyniak, W, Bardan, W, Bashkanov, M, Bednarski, T, Bergmann, FS, Berłowski, M, Bhatt, H, Buscher, M, Calen, H, Clement, H, Coderre, D, Czerwiński, E, Demmich, K, Doroshkevich, E, Engels, R, Erven, W, Eyrich, W, Fedorets, P, Fohl, K, Fransson, K, Goldenbaum, F, Goslawski, P, Goswami, A, Grigoryev, K, Gullstrom, CO, Hauenstein, F, Heijkenskjold, L, Hejny, V, Hinterberger, F, Hodana, M, Hoistad, B, Jany, A, Jany, BR, Jarczyk, L, Johansson, T, Kamys, B, Kemmerling, G, Khan, FA, Khoukaz, A, Kistryn, S, Klaja, J, Kleines, H, Kłos, B, Krapp, M, Krzemień, W, Kulessa, P, Kupść, A, Lalwani, K, Lersch, D & WASA-At-COSY Collaboration 2013, 'Isospin decomposition of the basic double-pionic fusion in the region of the ABC effect', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 721, no. 4-5, pp. 229-236. https://doi.org/10.1016/j.physletb.2013.03.019

TY - JOUR

T1 - Isospin decomposition of the basic double-pionic fusion in the region of the ABC effect

AU - Adlarson, P.

AU - Augustyniak, W.

AU - Bardan, W.

AU - Bashkanov, M.

AU - Bednarski, T.

AU - Bergmann, F. S.

AU - Berłowski, M.

AU - Bhatt, H.

AU - Buscher, M.

AU - Calen, H.

AU - Clement, H.

AU - Coderre, D.

AU - Czerwiński, E.

AU - Demmich, K.

AU - Doroshkevich, E.

AU - Engels, R.

AU - Erven, W.

AU - Eyrich, W.

AU - Fedorets, P.

AU - Fohl, K.

AU - Fransson, K.

AU - Goldenbaum, F.

AU - Goslawski, P.

AU - Goswami, A.

AU - Grigoryev, K.

AU - Gullstrom, C. O.

AU - Hauenstein, F.

AU - Heijkenskjold, L.

AU - Hejny, V.

AU - Hinterberger, F.

AU - Hodana, M.

AU - Hoistad, B.

AU - Jany, A.

AU - Jany, B. R.

AU - Jarczyk, L.

AU - Johansson, T.

AU - Kamys, B.

AU - Kemmerling, G.

AU - Khan, F. A.

AU - Khoukaz, A.

AU - Kistryn, S.

AU - Klaja, J.

AU - Kleines, H.

AU - Kłos, B.

AU - Krapp, M.

AU - Krzemień, W.

AU - Kulessa, P.

AU - Kupść, A.

AU - Lalwani, K.

AU - Lersch, D.

AU - WASA-At-COSY Collaboration

PY - 2013/4/25

Y1 - 2013/4/25

N2 - Exclusive and kinematically complete high-statistics measurements of the basic double-pionic fusion reactions pn→dπ0π0, pn→dπ+π- and pp→dπ+π0 have been carried out simultaneously over the energy region of the ABC effect using the WASA detector setup at COSY. Whereas the isoscalar reaction part given by the dπ0π0 channel exhibits the ABC effect, i.e. a low-mass enhancement in the ππ- invariant mass distribution, as well as the associated resonance structure in the total cross section, the isovector part given by the dπ+π0 channel shows a smooth behavior consistent with the conventional tchannel Δ Δ process. The dπ+π- data are very well reproduced by combining the data for isovector and isoscalar contributions, if the kinematical consequences of the isospin violation due to different masses for charged and neutral pions are taken into account.

AB - Exclusive and kinematically complete high-statistics measurements of the basic double-pionic fusion reactions pn→dπ0π0, pn→dπ+π- and pp→dπ+π0 have been carried out simultaneously over the energy region of the ABC effect using the WASA detector setup at COSY. Whereas the isoscalar reaction part given by the dπ0π0 channel exhibits the ABC effect, i.e. a low-mass enhancement in the ππ- invariant mass distribution, as well as the associated resonance structure in the total cross section, the isovector part given by the dπ+π0 channel shows a smooth behavior consistent with the conventional tchannel Δ Δ process. The dπ+π- data are very well reproduced by combining the data for isovector and isoscalar contributions, if the kinematical consequences of the isospin violation due to different masses for charged and neutral pions are taken into account.

KW - ABC effect and resonance structure

KW - Double pion production

KW - Isospin decomposition

UR - http://www.scopus.com/inward/record.url?scp=84875900143&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2013.03.019

DO - 10.1016/j.physletb.2013.03.019

M3 - Article

SN - 0370-2693

VL - 721

SP - 229

EP - 236

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

IS - 4-5

ER -

Isospin decomposition of the basic double-pionic fusion in the region of the ABC effect

Abstract

Keywords

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