Supernarrow Dibaryons
- PDF / 936,501 Bytes
- 8 Pages / 612 x 792 pts (letter) Page_size
- 11 Downloads / 166 Views
upernarrow Dibaryons L. V. Fil’kov* Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991 Russia *e-mail: [email protected] Received March 4, 2019; revised March 20, 2019; accepted March 29, 2019
Abstract—An analysis of the experimental search for supernarrow dibaryons (SNDs) have been performed. The sum rules for SND masses have been constructed. The calculated values of the SND masses are in good agreement with the existing experimental values. It has been shown that the SND decay leads to the formation of N* with small masses. Experimental observations of N* is an additional confirmation of the possibility of the SND existence. DOI: 10.1134/S1063779619050071
INTRODUCTION Supernarrow dibaryons (SNDs) are 6-quark states, a decay of which into two nucleons is forbidden by the Pauli exclusion principle [1–3]. Such states satisfy the following condition:
(−1)T + S P = +1,
(1)
where T is the isospin, S is the internal spin, and P is the dibaryon parity. In the NN channel, these sixquark states would correspond to the following forbidden states: even singlets and odd triplets with the isotopic spin T = 0 as well as odd singlets and even triplets with T = 1. These six-quark states with the masses M < 2mN + mπ ( mN (mπ ) is the nucleon (pion) mass) can mainly decay by emitting a photon. This is a new class of metastable six-quark states with the decay widths
