Summary
η′η pair production in the charge exchange reaction π−p→η′ηn has been observed and studied in a search for glueballs with the 38 GeV/c pion beam of the 70 GeV IHEP accelerator. The γ-rays from the decay η′η→4γ were detected with the hodoscope spectrometer GAMS-2000. The η′η events in the mass range from threshold up to 1.8 GeV are decays of the scalar G(1590)-meson which has been already observed in its ηη decay mode. The measured ratio of the partial widths of the G→η′η and the G → ηη decay channels is 2.7±0.8 in agreement with the value expected for glueballs.
Riassunto
È stata osservata e studiata la produzione di coppie η′η nella reazione di scambio di carica π−p→η′ηn nella ricerca di sfere di gluoni con il fascio di pioni a 38 GeV/c dell’acceleratore IHEP a 70 GeV. I raggi gamma derivanti dal decadimento η′η→4γ sono stati rivelati con lo spettrometro odoscopico GAMS-2000. Gli eventi η′η nell’intervallo di massa dalla soglia fino a 1.8 GeV sono decadimenti del mesone scalare G(1590) che è stato già osservato nel suo modo di decadimento ηη. Il rapporto misurato delle ampiezze parziali dei canadi di decadimento G→η′η e G→ηη è 2.7 ± 0.8 in accordo con il valore atteso per le sfere di gluoni.
Резуме
Наблюдается и исследуется рождение η′η пар в реакции перезарядки π−p→η′ηn с целью поиска «глюболов», используя пионный пучок с импульсом 38 ГэB/c ускорителя 70 ГэB IHEP. γ-лучи из распада η′η→→4γ детектируются с помощью спектрометра GAMS-2000. η′η события в области масс от порога вплоть до 1.8 ГэB представляют распады скалярного G(1590)-мезона, который уже наблюдался в моде распада ηη. Измеренное отношение парциальных ширин каналов распадов G→η′η и G → ηη, составляет 2.8±0.8, что согласуется с ожидаемой величиной для «глюбола».
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Binon, F., Bricman, C., Donskov, S.V. et al. Study of π−p→η′ηn in a search for glueballs. Nuov Cim A 80, 363–370 (1984). https://doi.org/10.1007/BF02785807
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DOI: https://doi.org/10.1007/BF02785807