Importance of d-wave contributions in the charge symmetry breaking reaction dd -> He-4 pi(0)
- ADLARSON, P
- AUGUSTYNIAK, W
- BARDAN, W
- BASHKANOV, M
- BERGMANN, FS
- BERLOWSKI, M
- BONDAR, A
- BUSCHER, M
- CALEN, H
- CIEPAL, I
- CLEMENT, H
- CZERWINSKI, E
- DEMMICH, K
- ENGELS, R
- ERVEN, A
- ERVEN, W
- EYRICH, W
- FEDORETS, P
- FOHL, K
- FRANSSON, K
- GOLDENBAUM, F
- GOSWAMI, A
- GRIGORYEV, K
- GULLSTROM, CO
- HANHART, C
- HEIJKENSKJOLD, L
- HEJNY, V
- HUSKEN, N
- JARCZYK, L
- JOHANSSON, T
- KAMYS, B
- KEMMERLING, G
- KHATRI, G
- KHOUKAZ, A
- KHREPTAK, O
- KIRILLOV, DA
- KISTRYN, S
- KLEINES, H
- KLOS, B
- KRZEMIEN, W
- KULESSA, P
- KUPSC, A
- KUZMIN, A
- LALWANI, K
- LERSCH, D
- LORENTZ, B
- MAGIERA, A
- MAIER, R
- MARCINIEWSKI, P
- MARIANSKI, B
- MORSCH, HP
- MOSKAL, P
- OHM, H
- PAROL, W
- DEL RIO, EP
- PISKUNOV, NM
- PRASUHN, D
- PSZCZEL, D
- PYSZ, K
- PYSZNIAK, A
- RITMAN, J
- ROY, A
- RUDY, Z
- RUNDEL, O
- SAWANT, S
- SCHADMAND, S
- SCHATTI-OZERIANSKA, I
- SEFZICK, T
- SERDYUK, V
- SHWARTZ, B
- SITTERBERG, K
- SKORODKO, T
- SKURZOK, M
- SMYRSKI, J
- SOPOV, V
- STASSEN, R
- STEPANIAK, J
- STEPHAN, E
- STERZENBACH, G
- STOCKHORST, H
- STROHER, H
- SZCZUREK, A
- TRZCINSKI, A
- WOLKE, M
- WRONSKA, A
- WUNSTNER, P
- YAMAMOTO, A
- ZABIEROWSKI, J
- ZIELINSKI, MJ
- ZLOMANCZUK, J
- ZUPRANSKI, P
- ZUREK, M
DOIAbstract
This letter reports a first quantitative analysis of the contribution of higher partial waves in the charge symmetry breaking reaction dd -> He-4 pi(0) using the WASA-at-COSY detector setup at an excess energy of Q = 60 MeV. The determined differential cross section can be parametrized as d sigma/d Omega = a + b cos(2) theta*, where theta* 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)(-0.8)(+0.32)(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 A isobar to the dd -> He-4 pi(0) reaction ...
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