All strange and terrible events: A search for the H dibaryon

Technical Report · Fri Dec 01 04:00:00 EST 1995

DOI:https://doi.org/10.2172/249254· OSTI ID:249254

Ware, B.

No six-quark bound hadron, (other than the loosely bound deuteron) has been observed, despite several experimental searches. Some models of quark dynamics predict the existence of such a state, the doubly-strange six-quark H dibaryon (uuddss) being the most likely. The mass of the H would be between that of the deuteron and the 2m{sub {Lambda}} strong interaction decay threshold. In 1992, Experiment E888 at Brookhaven National Lab`s Alternating Gradient Synchrotron collected data to search for this particle. The detector consisted of a two-arm spectrometer with drift chamber tracking and two magnets for momentum analysis, scintillator hodoscope triggering, Cerenkov particle identification, an electromagnetic calorimeter, and a muon hodoscope and rangefinder. The experiment searched for the decay {Lambda} {yields} p{pi}{sup -} from the weak decays of H {yields} {Lambda}n and H {yields} {Sigma}{sup 0}n (followed by {Sigma}{sup 0} {yields} {Lambda}{gamma}). This search was sensitive to weakly decaying H dibaryons with lifetimes from 6-230 us with production cross-sections greater than {approximately}2 {mu}b/steradian.

• Research Organization: Texas Univ., Austin, TX (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG03-93ER40757
• OSTI ID: 249254
• Report Number(s): DOE/ER/40757--076; UTEXAS-HEP--95-20; KL--46OH; ON: DE96011649
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
DATA ACQUISITION SYSTEMS
DIBARYONS
EXPERIMENTAL DATA
HADRONIC PARTICLE DECAY
LAMBDA PARTICLES
PARTICLE PRODUCTION
QUANTUM CHROMODYNAMICS
QUARK MODEL
SHOWER COUNTERS
WEAK HADRONIC DECAY