Case for quasinuclear N N bound states

Journal Article · Fri Feb 01 04:00:00 EST 1991 · Physical Review, C (Nuclear Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevC.43.379· OSTI ID:5835900

Dover, C B ^[1]; Gutsche, T; Faessler, A ^[2]

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1. Physics Department, Brookhaven National Laboratory, Upton, New York 11973 (US)
2. Institut fuer Theoretische Physik, Universitaet Tuebingen, Auf der Morgenstelle 14, 7400 Tuebingen (Federal Republic of Germany)

Recent experimental results on nucleon-antinucleon annihilation reactions of the type {ital {bar N}N}{r arrow}{pi}{ital X} have provided evidence for a new mesonic state {ital X}{sub 2} with quantum numbers {ital J}{sup {pi}{ital C}}({ital I}{sup {ital G}})=2{sup ++}(0{sup +}) which lies outside of the usual quark-antiquark ({ital Q{bar Q}}) tensor meson nonet of flavor SU(3). We show that the observed production rates of {ital X}{sub 2} from atomic {ital {bar p}p} states of orbital angular momentum {ital L}=0,1, as well as the decay characteristics of {ital X}{sub 2}, namely, its preference for {rho}{rho} over {pi}{pi} decay and the absence of an observable {ital {bar K}K} mode, are consistent with an interpretation of {ital X}{sub 2} as a quasinuclear bound state of the {ital {bar N}N} potential. The principal binding mechanism for such states is provided by the coherent tensor forces for isospin {ital I}=0 which arise from meson exchanges. We review the evidence for the 0{sup ++}(0{sup +}) and 1{sup {minus}{minus}}(0{sup {minus}}) states predicted in this model and apply the {sup 3}{ital P}{sub 0} strong-coupling quark model to estimate the decay branching ratios for a variety of {ital {bar N}N} bound states. Key experimental tests of our interpretation are discussed.

• OSTI ID: 5835900
• Journal Information: Physical Review, C (Nuclear Physics); (USA), Journal Name: Physical Review, C (Nuclear Physics); (USA) Vol. 43:2; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

645204* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Strong Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
BOUND STATE
ELEMENTARY PARTICLES
HADRONS
MESONS
NUCLEON-NUCLEON POTENTIAL
PARTICLE IDENTIFICATION
POTENTIALS
QUANTUM NUMBERS
TENSOR FORCES