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Search for gluonic bound states in high energy proton-proton collisions

Technical Report ·
OSTI ID:6965686
The Double Pomeron Exchange process is studied as a potential source for the production of gluonic bound states utilizing the Intersecting Storage Rings at the European Organization for Nuclear Research in Geneva, Switzerland. Three different triggers are studied, which differ in the requirements placed on the slow central system produced by the Pomeron-Pomeron interaction. Exclusive four and six prong events are studied. A spin-parity analysis is performed on the ..pi../sup +/..pi../sup -/ system in the exclusive channel pp ..-->.. pp..pi../sup +/..pi../sup -/ for two of the triggers. The large enhancement previously seen in DPE reactions in the region of the f/sup 0/ meson is confirmed to be a spin-two object. No other resonant states are observed in the ..pi../sup +/..pi../sup -/ system. The exclusive channels pp ..-->.. ppK/sup +/K/sup -/ and pp ..-->.. ppp anti p are examined, but due to limited statistics no strong conclusions can be drawn from these samples. The exclusive channel pp ..-->.. pp..pi../sup +/..pi../sup +/..pi../sup -/..pi../sup -/ is analyzed for the subprocesses pp ..-->.. pprho/sup 0/ ..pi../sup +/..pi../sup -/ and pp ..-->.. pp rho/sup 0/rho/sup 0/. No enhancement is seen for the rho/sup 0/rho/sup 0/ channel. This result is quite different from that obtained for the topologically similar ..gamma gamma.. interaction in e/sup +/e/sup -/ collisions. A simple spin-parity analysis of the ..pi../sup +/..pi../sup +/..pi../sup -/..pi../sup -/ system reveals no structure as a function of the four pion mass. The exclusive process pp ..-->.. ppK/sub s//sup 0/K/sup + -/..pi../sup - +/ is studied and the K/sup 0/K..pi.. mass spectrum is examined. An enhancement is seen in the region of 1500 MeV, but it appears to originate from events which have missing tracks, rather than from the exclusive final state. While this does not preclude its interpretation as a genuine resonant state, it does mean that a definite statement cannot be made on the basis of this analysis.
Research Organization:
Ames Lab., IA (USA)
DOE Contract Number:
W-7405-ENG-82
OSTI ID:
6965686
Report Number(s):
IS-T-1249; ON: DE87003052
Country of Publication:
United States
Language:
English

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Related Subjects

645103* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Strong Interactions & Baryon & Meson Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR MOMENTUM
BARYON-BARYON INTERACTIONS
BARYONS
BOSONS
CHARM PARTICLES
DATA
DIAGRAMS
ELEMENTARY PARTICLES
EXCLUSIVE INTERACTIONS
EXPERIMENTAL DATA
F MESONS
FERMIONS
GLUEBALLS
HADRON-HADRON INTERACTIONS
HADRONS
INFORMATION
INTERACTIONS
KAONS
MASS SPECTRA
MESONS
NUCLEON-NUCLEON INTERACTIONS
NUCLEONS
NUMERICAL DATA
PAIR PRODUCTION
PARITY
PARTIAL WAVES
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
PHASE SHIFT
PIONS
POMERANCHUK PARTICLES
POSTULATED PARTICLES
PROTON-NUCLEON INTERACTIONS
PROTON-PROTON INTERACTIONS
PROTONS
PSEUDOSCALAR MESONS
RHO-765 RESONANCES
SCATTERPLOTS
SPECTRA
SPIN
STRANGE MESONS
STRANGE PARTICLES
STRANGENESS