/ Experiment-Nucl arXiv:1203.4198


Resonance structure in the {\gamma}{\gamma} and $\pi^0\pi^0$ systems in dC interactions


Abraamyan, Kh.U. (Yerevan State U.) ; Anisimov, A.B. (Dubna, JINR) ; Baznat, M.I. (IAP, Chisinau) ; Gudima, K.K. (IAP, Chisinau) ; Kozhin, M.A. (Dubna, JINR) ; Kukulin, V.I. (Tubingen U.) ; Nazarenko, M.A. (Moscow RAS, IRE) ; Reznikov, S.G. (Dubna, JINR) ; Sorin, A.S. (Dubna, JINR)

Pages: 10

Abstract: Along with $\pi^0$ and {\eta} mesons, a resonance structure in the invariant mass spectrum of two photons at M{\gamma}{\gamma} = 360 \pm 7 \pm 9 MeV is observed in the reaction d + C \rightarrow {\gamma} + {\gamma} + X at momentum 2.75 GeV/c per nucleon. Estimates of its width and production cross section are {\Gamma} = 64 \pm 18 MeV and $\sigma_{\gamma\gamma}$ = 98 \pm 24 {\mu}b, respectively. The collected statistics amount to 2339 \pm 340 events of 1.5 \cdot 10^6 triggered interactions of a total number ~ 10^12 of dC-interactions. The results on observation of the resonance in the invariant mass spectra of two $\pi^0$ mesons are presented: the data obtained in the d + C \rightarrow {\gamma} + {\gamma} reaction is confirmed by the d + C \rightarrow $\pi^0$ + $\pi^0$ reaction: $M_{\pi^0\pi^0}$ = 359.2 \pm 1.9 MeV, {\Gamma} = 48.9 \pm 4.9 MeV/ the ratio of Br(R\rightarrow{\gamma}{\gamma}) / Br(R\rightarrow$\pi^0\pi^0$) = (1.8 {\div} 3.7)\cdot10^-3.

Web-Page: http://inspirehep.net/record/1094216/files/arXiv:1203.4198.pdf


Note: 10 pages, 11 figures

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 Запись создана 2012-05-22, последняя модификация 2014-01-30


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