Coherent photoproduction of η-mesons off 3He – search for η-mesic nuclei

F Pheron,A Starostin,K Bantawa,I Supek,M Dieterle,A Braghieri,L Witthauer,M Thiel,D Werthmüller,S Cherepnya,A Polonski,M Kotulla,O Jahn,P Pedroni,V Lisin,G Rosner,J Ahrens,H Berghäuser,A Nikolaev,D Hornidge,V Metag,J Mancell,D Branford,M Unverzagt,R Kondratiev,A Thomas,M Korolija,Z Marinides,B Oussena,K Livingston,T Rostomyan,L.V FilʼKov,R Beck,R Novotny,B Boillat,V Bekrenev,A Mushkarenkov,Y Maghrbi,B Krusche,S Schumann,E Heid,M Oberle,J Robinson,J Brudvik,M Ostrick,P Drexler,D Howdle,B Demissie,F Zehr,I Keshelashvili,W J Briscoe ,D M Manley ,D I Sober ,S Prakhov ,E F Mcnicoll ,D Watts ,T C Jude ,V L Kashevarov ,P Aguar Bartolomé ,J C Mcgeorge ,I J D Macgregor ,J R M Annand ,H J Arends ,I Jaeglé ,B M K Nefkens ,M H Sikora ,S P Kruglov ,M Martínez ,E J Downie ,Saša Mićanović ,D G Middleton ,D Mekterović ,A A Kulbardis ,D I Glazier

doi:10.1016/j.physletb.2012.01.075

Coherent photoproduction of η-mesons off 3He – search for η-mesic nuclei

F Pheron, A Starostin + Show 72 more

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https://doi.org/10.1016/j.physletb.2012.01.075

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Journal: Physics Letters B	Publication Date: Feb 1, 2012
Citations: 54

Affiliation: University of Basel, University of California, Los Angeles, Kent State University, University of Edinburgh, INFN Sezione di Pavia, P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Johannes Gutenberg University Mainz, University of Glasgow, George Washington University, University of Giessen, University of Bonn, Petersburg Nuclear Physics Institute

#TAPS Detector #Near-threshold Region + Show 8 more

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Abstract

Coherent photoproduction of η-mesons off 3He, i.e. the reaction γ3He→η3He, has been investigated in the near-threshold region. The experiment was performed at the Glasgow tagged photon facility of the Mainz MAMI accelerator with the combined Crystal Ball – TAPS detector. Angular distributions and the total cross section were measured using the η→γγ and η→3π0→6γ decay channels. The observed extremely sharp rise of the cross section at threshold and the behavior of the angular distributions are evidence for a strong ηHe3 final state interaction, pointing to the existence of a resonant state. The search for further evidence of this state in the excitation function of π0-proton back-to-back emission in the γ3He→π0pX reaction revealed a very complicated structure of the background and could not support previous conclusions.

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