A Strange Matter: Searching for the H Dibaryon

Details A Strange Matter: Searching for the H Dibaryon A Strange Matter: Searching for the H Dibaryon

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994phdt........31k&link_type=abstract

Thesis (PH.D.)--PRINCETON UNIVERSITY, 1994.Source: Dissertation Abstracts International, Volume: 55-06, Section: B, page: 2253.

Other

Quarks, Hexaquark

Scientific paper

The apparent cacophony of fundamental particles in the 1950's and 1960's gave way in the 1970's to the harmony of the quark model and the elegance of QCD: baryons like the proton are made of three quarks, mesons like the pi from a quark-antiquark pair. No states with more quarks have ever been found. However, in 1977 R. L. Jaffe predicted that one particular symmetric six quark state, containing two up quarks, two down quarks, and two strange quarks might in fact have enough binding energy to lie below the strong decay threshold. He called his particle the H, for 'hexaquark'. Since Jaffe's prediction, most other calculations of the H mass have agreed with his result, and many have speculated that larger multiquark objects containing strange quarks ('strange matter') may lie at the heart of the densest pulsars, be responsible for anomalous cosmic ray events, or are perhaps a component of dark matter. I describe here a search for a very deeply bound H through the dissociation reaction H + A to LambdaLambda + A at the Brookhaven Alternating Gradient Synchrotron, as well as simple theoretical estimates of the H dissociation cross section and the H production rate for our experiment. We have observed a total of 37 LambdaLambda events above background, none of which are consistent with the kinematics of H dissociation. We therefore set an upper limit on the differential production cross section of H's in p + Pt collisions of ~1.0 mb/sr. In addition, we have detected 187 +/- 39 events from the analogous dissociation reaction n + C to Lambda K_ {S} + C, the first observation of this coherent process.

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