| Title: | Importance of d-wave contributions in the charge symmetry breaking reaction dd→4Heπ0 |
| Authors: | Adlarson, P.
Augustyniak, W.
Bardan, W.
Bashkanov, M.
Bergmann, F. S.
Berłowski, M.
Bondar, A.
Büscher, M.
Calén, H.
Ciepał, I.
Clement, H.
Czerwiński, E.
Demmich, K.
Engels, R.
Erven, A.
Erven, W.
Eyrich, W.
Fedorets, P.
Föhl, K.
Fransson, K.
Goldenbaum, F.
Goswami, A.
Grigoryev, K.
Gullström, C.-O.
Hanhart, C.
Heijkenskjöld, L.
Hejny, V.
Hüsken, N.
Jarczyk, L.
Johansson, T.
Kamys, B.
Kemmerling, G.
Khatri, G.
Khoukaz, A.
Khreptak, O.
Kirillov, D. A.
Kistryn, S.
Kleines, H.
Kłos, Barbara
Krzemień, W.
Kulessa, P.
Kupść, A.
Kuzmin, A.
Lalwani, K.
Lersch, D.
Lorentz, B.
Magiera, A.
Maier, R.
Marciniewski, P.
Mariański, B.
Morsch, H.-P.
Moskal, P.
Ohm, H.
Parol, W.
Perez del Rio, E.
Piskunov, N. M.
Prasuhn, D.
Pszczel, D.
Pysz, K.
Pyszniak, A.
Ritman, J.
Roy, A.
Rudy, Z.
Rundel, O.
Sawant, S.
Schadmand, S.
Schätti-Ozerianska, I.
Sefzick, T.
Serdyuk, V.
Shwartz, B.
Sitterberg, K.
Skorodko, T.
Skurzok, M.
Smyrski, J.
Sopov, V.
Stassen, R.
Stepaniak, J.
Stephan, Elżbieta
Sterzenbach, G.
Stockhorst, H.
Ströher, H.
Szczurek, A.
Trzciński, A.
Wolke, M.
Wrońska, A.
Wüstner, P.
Yamamoto, A.
Zabierowski, J.
Zieliński, M. J.
Złomańczuk, J.
Żuprański, P.
Żurek, M. |
| Keywords: | charge symmetry breaking; deuteron–deuteron interactions; pion production |
| Issue Date: | 2018 |
| Citation: | Physics Letters B, Vol. 781 (2018), s. 645-650 |
| Abstract: | This letter reports a first quantitative analysis of the contribution of higher partial waves in the charge symmetry breaking reaction dd→4Heπ0 using the WASA-at-COSY detector setup at an excess energy of Q=60MeV. The determined differential cross section can be parametrized as dσ/dΩ=a+bcos2θ⁎, where θ⁎ is the production angle of the pion in the center-of-mass coordinate system, and the results for the parameters are a=(1.55±0.46(stat)+0.32−0.8(syst))pb/sr
and b=(13.1±2.1(stat)−2.7+1.0(syst))pb/sr
. The data are compatible with vanishing p-waves and a sizable d-wave contribution. This finding should strongly constrain the contribution of the Δ isobar to the dd→4Heπ0
reaction and is, therefore, crucial for a quantitative understanding of quark mass effects in nuclear production reactions. |
| URI: | http://hdl.handle.net/20.500.12128/5740 |
| DOI: | 10.1016/j.physletb.2018.04.037 |
| ISSN: | 0370-2693 |
| Appears in Collections: | Artykuły (WNŚiT)
|
