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EPJ A - Hadrons and Nuclei
Hadrons and Nuclei


Eur. Phys. J. A 12, 369-374 (2001)

New evidence for supernarrow dibaryons production in $\mth{pd}$ interactions

L.V. Fil'kov1, V.L. Kashevarov1, E.S. Konobeevski2, M.V. Mordovskoy2, S.I. Potashev2, V.A. Simonov2, V.M. Skorkin2 and S.V. Zuev2

1  Lebedev Physical Institute, RAS, Leninsky Prospect 53, 117924 Moscow, Russia
2  Institute for Nuclear Research, RAS, 60-th October Anniversary Prospect 7a, 117312 Moscow, Russia

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(Received: 22 October 2001 / Revised version: 13 November 2001 Communicated by Th. Walcher)

Abstract
The analysis of new experimental data, obtained at the Proton Linear Accelerator of INR, with the aim to search for supernarrow dibaryons in the $pd\to ppX_1$ and $pd\to pdX_2$ reactions is presented. Narrow peaks with an experimental width of 5 MeV at masses of $1904 \pm 2$, $1926 \pm 2$, and $1942 \pm 2$ MeV have been observed in missing mass MpX1 spectra. In the missing mass MX1 spectra, the peaks at $M_{X_1}=966\pm 2$, $986 \pm 2$, and $1003 \pm 2$ MeV have been found. The analysis of the data obtained leads to the conclusion that the observed peaks in MpX1 spectra are most likely supernarrow dibaryons, the decay of which into two nucleons is forbidden by the Pauli exclusion principle. An alternative interpretation of the spectra by assuming a decay of the supernarrow dibaryons in "exotic baryon states" with masses MX1 is discussed.

PACS
13.75.Cs - Nucleon-nucleon interactions (including antinucleons, deuterons, etc.).
14.20.Pt - Dibaryons.
12.39.Mk - Glueball and nonstandard multi-quark/gluon states.

© Società Italiana di Fisica, Springer-Verlag 2001

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