Search for the H Dibaryon (S = -2) Using Diffraction Dissociation [electronic resource].

Published:: Washington, D.C. : United States. Dept. of Energy. Office of Science, 2005.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Additional Creators:: Stanford Linear Accelerator Center, United States. Department of Energy. Office of Science, and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

The observed hadrons are understood as bound states of three quarks (baryons) or of quarks and antiquarks (mesons). To date no six quark bound state other than the loosely bound deuteron has been observed. Quantum Chromodynamics permits other color-singlet bound states of quarks, and a number of phenomenological models extended from the baryon (q³) and meson (q{bar q}) sectors predict bound six quark states (q⁶). The most probable candidate is the H dibaryon, composed of two each of the lightest three quarks (udsuds), with quantum numbers J{sup P} = 0⁺, I = 0 and S = -2. Its mass would likely be between the deuteron mass and twice the Λ (uds) mass. This dissertation describes a search for the H dibaryon conducted in a neutral beam at the Brookhaven National Laboratory's Alternating Gradient Synchrotron. In the experiment a 24.1 GeV/c proton beam struck a 1.35 interaction length platinum target producing a collimated neutral beam (62 μsr at 65 mrad from the incident proton direction) which propagated through a 18 m vacuum decay tank before entering a double arm spectrometer. Approximately 20 m from the production target a 10 cm (0.15 interaction length) long active scintillator dissociator was placed in the beam.

Report Numbers:

E 1.99:slac-r-749
slac-r-749

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Note:

Published through SciTech Connect.
04/05/2005.
"slac-r-749"
Ecklund, K.

Type of Report and Period Covered Note:

Topical;

Funding Information:

AC02-76SF00515

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