@article{54788eeb21d0423bacdc80aec0806f35,

title = "Search for the $η$ mesic $^3$He in the $pd\rightarrow d p π^{0}$ reaction with the WASA-at-COSY facility",

abstract = " The excitation function for the $pd\rightarrow$ $d p \pi^{0}$ reaction has been measured by WASA-at-COSY experiment with the aim of searching for $^{3}\hspace{-0.03cm}\mbox{He}$-$\eta$ mesic nuclei. The measurement in the vicinity of $\eta$ meson production was performed using a ramped proton beam. The data analysis and interpretation was carried out with the assumption that the $\eta$-mesic Helium decays via the formation of an intermediate N$^{*}$(1535) resonance. No direct signal of the $\eta$-mesic nucleus is observed in the excitation function. We determine a new improved upper limit for the total cross section for the bound state production and decay in the $pd\rightarrow$ $(^{3}\hspace{-0.03cm}\mbox{He}$-$\eta)_{bound} \rightarrow$ $d p \pi^{0}$ process. It varies between 13 nb to 24 nb for the bound state with width in the range $\Gamma \in (5,50)$ MeV. ",

keywords = "nucl-ex",

author = "{WASA-At-COSY Collaboration} and P. Adlarson and W. Augustyniak and M. Bashkanov and Bass, {S. D.} and Bergmann, {F. S.} and M. Berlowski and A. Bondar and M. Buscher and H. Calen and I. Ciepal and H. Clement and E. Czerwinski and K. Demmich and R. Engels and A. Erven and W. Erven and W. Eyrich and P. Fedorets and K. Fohl and K. Fransson and F. Goldenbaum and A. Goswami and K. Grigoryev and L. Heijkenskjold and V. Hejny and N. Husken and S. Hirenzaki and T. Johansson and B. Kamys and Kelkar, {N. G.} and G. Kemmerling and A. Khoukaz and A. Khreptak and Kirillov, {D. A.} and S. Kistryn and H. Kleines and B. Klos and W. Krzemien and P. Kulessa and A. Kupsc and K. Lalwani and D. Lersch and B. Lorentz and A. Magiera and R. Maier and P. Marciniewski and B. Marianski and Morsch, {H. -P.} and P. Moskal and H. Ohm",

year = "2020",

month = jul,

day = "30",

doi = "10.1103/PhysRevC.102.044322",

language = "Undefined/Unknown",

journal = "Phys. Rev. C",

issn = "2469-9985",

publisher = "American Physical Society",

}