Future dibaryon research at BNL Page: 1 of 8
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DE86
FUTURE DIBARYON RESEARCH AT BNL
Philip H. Pile
Brookhavcn National Laboratory, Upton, New York, 1197A
ABSTRACT
An experiment designed to search for a strangeness -1
dibaryon is discussed. The experiment will use the
3He(K“, n+)nDs reaction and is expected to begin near the end of
the year at the BNL AGS using the existing LESB-I beamline and
hypernuclear spectrometer system. Planned searches for a strange-
ness -2 dibaryon are also discussed. The strangeness —2 dibaryon
searches will however require the construction of a new 1.8 GeV/c
kaon beam line at the AGS.
INTRODUCTION
The success of the quark model in describing the baryon and
meson mass spectra has led to calculations which predict that
certain systems, with the quarks of two baryons, may be stable
with respect to strong decay or at least have narrow decay
widths. In particular, most bag models predict that although
non-strange dibaryon states will have large decay widths, strange-
ness -1 (S “ -1) dibaryons may have narrow decay widths and one S
= -2 dibaryon may be stable with respect to strong decay. There
has not been an experiment to date with the required sensitivity
or the necessary freedom from background processes which can prove
or disprove the existence of dibaryon states. Planned experiments
at the Brookhaven AGS which will attempt to identify S » -1 and S
= -2 dibaryon states will be discussed.
S - -1 DIBARYONS
Theoretical predictions of the absolute masses of dibaryons
have rather large uncertainties. However, the uncertainty in the
difference in mass between dibaryons with a given strangeness is
not so large. Figure 1 shows the result of a calculation by
Mulders, Aerts and deSwart.
Two S » -1 dibaryons are predicted to have rather narrow
decay widths. Both are isospin 1/2, (Q)1* x (Q)2 clusters. In a
relative P state. The state designated as Bt at 2150 MeV/c2 Is
formed with the initial baryons In a spin triplet state and the
Ds state at 2110 MeV/c with the Initial baryons in a spin
singlet state. The (Q)6 configuration at 2170 MeV/e2 Is expected
to be unstable with respect to quark tunneling and therefore will
not have a narrow decay width. All other dibaryon states are
predicted to lie above the ANx threshold and will have very broad
decay widths.
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Pile, P.H. Future dibaryon research at BNL, article, January 1, 1986; Upton, New York. (https://digital.library.unt.edu/ark:/67531/metadc1092766/m1/1/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.