Search for η mesic 3He with the WASA-at-COSY facility in the pd→3He2γ and pd→3He6γ reactions

Adlarson P, Augustyniak W, Bardan W, Bashkanov M, Bass SD, Berłowski M, Bondar A, Büscher M, Calén H, Ciepał I, Clement H, Czerwiński E, Engels R, Erven A, Erven W, Eyrich W, Fedorets P, Föhl K, Fransson K, Goldenbaum F, Goswami A, Grigoryev K, Heijkenskjöld L, Hejny V, Hirenzaki S, Jarczyk L, Johansson T, Kamys B, Kelkar NG, Kemmerling G, Khreptak A, Kirillov DA, Kistryn S, Kleines H, Kłos B, Krzemień W, Kulessa P, Kupść A, Lalwani K, Lersch D, Lorentz B, Magiera A, Maier R, Marciniewski P, Mariański B, Morsch HP, Moskal P, Ohm H, Parol W, Perez del Rio E, Piskunov NM, Prasuhn D, Pszczel D, Pysz K, Ritman J, Roy A, Rundel O, Sawant S, Schadmand S, Schätti-Ozerianska I, Sefzick T, Serdyuk V, Shwartz B, Skorodko T, Skurzok M, Smyrski J, Sopov V, Stassen R, Stepaniak J, Stephan E, Sterzenbach G, Stockhorst H, Ströher H, Szczurek A, Trzciński A, Wolke M, Wrońska A, Wüstner P, Yamamoto A, Zabierowski J, Zieliński MJ, Złomańczuk J, Żuprański P, Żurek M (2020)

Publication Type: Journal article

Publication year: 2020

Journal

Book Volume: 802

Article Number: 135205

DOI: 10.1016/j.physletb.2020.135205

Abstract

We report on the experimental search for the bound state of an η meson and He3 nucleus performed using the WASA-at-COSY detector setup. In order to search for the η-mesic nucleus decay, the pd→³He2γ and pd→³He6γ channels have been analysed. These reactions manifest the direct decay of the η meson bound in a He3 nucleus. This non-mesonic decay channel has been considered for the first time. When taking into account only statistical errors, the obtained excitation functions reveal a slight indication for a possible bound state signal corresponding to a ³He-η nucleus width Γ above 20 MeV and binding energy Bs between 0 and 15 MeV. However, the determined cross sections are consistent with zero in the range of the systematic uncertainty. Therefore, as final result we estimate only the upper limit for the cross section of the η-mesic He3 nucleus formation followed by the η meson decay which varies between 2 nb and 15 nb depending on possible bound state parameters.

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Involved external institutions

University of Silesia in Katowice / Uniwersytet Śląski w Katowicach Poland (PL) Forschungszentrum Jülich / Research Centre Jülich (FZJ) Germany (DE) Institute of Nuclear Physics PAN / Instytut Fizyki Jądrowej im. Henryka Niewodniczańskiego PAN Poland (PL) Joint Institute for Nuclear Research (JINR) / Объединённый институт ядерных исследований (ОИЯИ) Russian Federation (RU) Jagiellonian University / Uniwersytet Jagielloński (UJ) Poland (PL) Indian Institute of Technology Bombay India (IN) Uppsala University Sweden (SE) National Centre for Nuclear Research (früher:Institute of Atomic Energy POLATOM & Andrzej Sołtan Institute for Nuclear Studies) / Narodowe Centrum Badań Jądrowych (NCBJ) Poland (PL) Malaviya National Institute of Technology Jaipur (MNIT) / मालवीय राष्ट्रीय प्रौद्योगिकी संस्थान जयपुर India (IN) Nara Women's University / 奈良女子大学 Japan (JP) Indian Institute of Technology Indore (IITI) / भारतीय प्रौद्योगिकी संस्थान इंदौर India (IN) Narodowe Centrum Badań Jądrowych Poland (PL) Budker Institute of Nuclear Physics (BINP) / Институт ядерной физики имени Г. И. Будкера СО РАН Russian Federation (RU) Institute for Theoretical and Experimental Physics (ITEP) /Институт теоретической и экспериментальной физики Russian Federation (RU) Eberhard Karls Universität Tübingen Germany (DE) The High Energy Accelerator Research Organization (KEK) Japan (JP) Universidad de los Andes - Colombia Colombia (CO) University of Edinburgh United Kingdom (GB) Justus-Liebig-Universität Gießen Germany (DE)

How to cite

APA:

Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bass, S.D., Berłowski, M.,... Żurek, M. (2020). Search for η mesic 3He with the WASA-at-COSY facility in the pd→3He2γ and pd→3He6γ reactions. Physics Letters B, 802. https://doi.org/10.1016/j.physletb.2020.135205

MLA:

Adlarson, P., et al. "Search for η mesic 3He with the WASA-at-COSY facility in the pd→3He2γ and pd→3He6γ reactions." Physics Letters B 802 (2020).

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