Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-10-10
AIP Conf.Proc. 619 (2002) 761-764
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, LaTex, 1 eps-figure; Talk given at the HADRON 2001, Protvino, Russia, August 27 - September 1,2001, to be published i
Scientific paper
10.1063/1.1482534
The energy spectrum for high energy $\gamma$-rays ($E_\gamma \geq 10$ MeV) from the process $pp \to \gamma \gamma X$ emitted at $90^0$ in the laboratory frame has been measured at 216 MeV. The resulting photon energy spectrum extracted from $\gamma-\gamma$ coincidence events consists of a narrow peak (5.3$\sigma$) at a photon energy of about 24 MeV and a relatively broad peak (3.5$\sigma$) in the energy range of (50 - 70) MeV. This behavior of the photon energy spectrum is interpreted as a signature of the exotic dibaryon resonance $d^\star_1$ with a mass of about 1956 MeV which is assumed to be formed in the radiative process $pp \to \gamma d^\star_1$ followed by its electromagnetic decay via the $d^\star_1 \to pp \gamma$ mode. The experimental spectrum is compared with those obtained by means of Monte Carlo simulations.
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