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@ARTICLE{Adlarson:837451,
      author       = {Adlarson, P. and Augustyniak, W. and Bardan, W. and
                      Bashkanov, M. and Bergmann, F. S. and Berłowski, M. and
                      Bondar, A. and Büscher, M. and Calén, H. and Ciepał, I.
                      and Clement, H. and Czerwiński, E. and Demmich, K. and
                      Engels, Ralf W. and Erven, A. and Erven, W. and Eyrich, W.
                      and Fedorets, P. and Föhl, K. and Fransson, K. and
                      Goldenbaum, F. and Goswami, A. and Grigoryev, K. and
                      Gullström, C. -O. and Hanhart, C. and Heijkenskjöld, L.
                      and Hejny, V. and Hüsken, N. and Jarczyk, L. and Johansson,
                      T. and Kamys, B. and Kemmerling, G. and Khatri, G. and
                      Khoukaz, A. and Khreptak, O. and Kirillov, D. A. and
                      Kistryn, S. and Kleines, H. and Kłos, B. and Krzemień, W.
                      and Kulessa, P. and Kupść, A. and Kuzmin, A. and Lalwani,
                      K. and Lersch, D. and Lorentz, B. and Magiera, A. and Maier,
                      R. and Marciniewski, P. and Mariański, B. and Morsch, H.
                      -P. and Moskal, P. and Ohm, H. and Parol, W. and del Rio, E.
                      Perez and Piskunov, N. M. and Prasuhn, D. and Pszczel, D.
                      and Pysz, K. and Pyszniak, A. and Ritman, J. and Roy, A. and
                      Rudy, Z. and Rundel, O. and Sawant, S. and Schadmand, S. and
                      Schätti-Ozerianska, I. and Sefzick, T. and Serdyuk, V. and
                      Shwartz, B. and Sitterberg, K. and Skorodko, T. and Skurzok,
                      M. and Smyrski, J. and Sopov, V. and Stassen, R. and
                      Stepaniak, J. and Stephan, E. and Sterzenbach, G. and
                      Stockhorst, H. and Stroeher, Hans and Szczurek, A. and
                      Trzciński, A. and Wolke, M. and Wrońska, A. and Wüstner,
                      P. and Yamamoto, A. and Zabierowski, J. and Zieliński, M.
                      J. and Złomańczuk, J. and Żuprański, P. and Zurek,
                      Maria},
      title        = {{I}mportance of d-wave contributions in the charge symmetry
                      breaking reaction $dd \to {}^4\text{{H}e}\pi^0$},
      reportid     = {FZJ-2017-06364},
      year         = {2017},
      note         = {3 figures},
      abstract     = {This letter reports the first measurement of the
                      contribution of higher partial waves in the charge symmetry
                      breaking reaction $dd \to {}^4\text{He}\pi^0$ using the
                      WASA-at-COSY detector setup at an excess energy of $Q = 60$
                      MeV. The determined differential cross section can be
                      parametrized as $\text{d}\sigma/\text{d}\Omega = a +
                      b\cos^{2}\theta^*$, where $\theta^*$ is the production angle
                      of the pion in the center-of-mass coordinate system, and the
                      results for the parameters are $a = \left(1.55 \pm 0.46
                      (\text{stat}) ^{+0.32}_{-0.8} (\text{syst}) \right)
                      \text{pb/sr}$ and $b = \left(13.1 \pm 2.1 (\text{stat})
                      ^{+1.0}_{-2.7} (\text{syst})\right) \text{pb/sr}$. The data
                      are compatible with vanishing $p$-waves and a sizable
                      $d$-wave contribution. This finding should strongly
                      constrain the contribution of the $\Delta$ isobar to the $dd
                      \to {}^4\text{He}\pi^0$ reaction and is therefore crucial
                      for a quantitative understanding of quark mass effects in
                      nuclear production reactions.},
      cin          = {IKP-2 / ZEA-2 / IKP-1 / IAS-4 / IKP-3 / IKP-4 / IKP-TA},
      cid          = {I:(DE-Juel1)IKP-2-20111104 / I:(DE-Juel1)ZEA-2-20090406 /
                      I:(DE-Juel1)IKP-1-20111104 / I:(DE-Juel1)IAS-4-20090406 /
                      I:(DE-Juel1)IKP-3-20111104 / I:(DE-Juel1)IKP-4-20111104 /
                      I:(DE-Juel1)IKP-TA-20111104},
      pnm          = {612 - Cosmic Matter in the Laboratory (POF3-612) / 631 -
                      Accelerator R $\&$ D (POF3-631)},
      pid          = {G:(DE-HGF)POF3-612 / G:(DE-HGF)POF3-631},
      experiment   = {EXP:(DE-Juel1)WASA-at-COSY-20170712},
      typ          = {PUB:(DE-HGF)25},
      eprint       = {1709.01060},
      howpublished = {arXiv:1709.01060},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:1709.01060;\%\%$},
      url          = {https://juser.fz-juelich.de/record/837451},
}