APS » PROLA » Phys. Rev. C » Volume 63 » Issue 3

Phys. Rev. C 63, 035206 (2001) [7 pages]

H-dibaryon search via Ξ- capture on the deuteron
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F. Merrill et al.
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Published 21 February 2001

A search for the H dibaryon has been conducted at the Brookhaven National Laboratory AGS, using a 1.8 GeV/c K- beam. Ξ- hyperons were produced in a liquid-hydrogen target via the reaction K-+p→K++Ξ-. The hyperons were slowed in degraders and those most likely to stop in an adjacent liquid-deuterium target were tagged by silicon detectors. Monoenergetic neutrons were sought as the signature for H formation in (Ξ-,d)atom→H+n. The experiment was designed for optimal sensitivity to a loosely-bound H, complementing recent (K-,K+) measurements on nuclear targets. In addition, the experiment’s sensitivity was independent of lifetime and of decay modes of the H. No statistically significant evidence for H formation was seen. Upper limits on the branching ratio for H formation in the above reaction have been set in a mass range extending from slightly above ΛΛ threshold to ∼100 MeV of binding and are compared with a corresponding theoretical prediction.


©2001 The American Physical Society

URL: http://link.aps.org/abstract/PRC/v63/e035206
DOI: 10.1103/PhysRevC.63.035206
PACS: 14.20.Pt, 14.20.Jn

* Present address: Los Alamos National Laboratory, Los Alamos, NM 87545.
† Present address: High Energy Accelerator Research Organization, Tsukuba 305-0801, Japan.
‡ Present address: Bloomsburg University of Pennsylvania, Bloomsburg, PA 17815.
§ Present address: SFA Inc., Largo, MD 20774.
** Present address: F. Hoffmann-La Roche Ltd., CH-4070 Basel, Switzerland.
†† Present address: Nicholls State University, Thibodaux, LA 70301.
‡‡ Present address: Hampton University, Hampton, VA 23668.
Present address: LIGO Hanford Observatory, Richland, WA 99352.
a Present address: Syncsort Inc., Woodcliff Lake, NJ 07675.
b Present address: Brookhaven National Laboratory, Upton, NY 11973.
c Present address: TransTech Pharma, Inc., High Point, NC 27265.
d Present address: ASAP, Albuquerque, NM 87110.
e Present address: 251 E. 46th, San Bernardino, CA 92404.
f Present address: Osaka City University, Osaka 558-8585, Japan.
g Present address: University of Kentucky, Lexington, KY 40507.
h Present address: Zybert Computing Limited, Birmingham B32 3PW, UK.

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