Diffractive photon dissociation in a high pressure hydrogen time projection chamber
We have performed an experiment at the Tagged Photon Facility of Fermilab to study the diffraction dissociation of high energy photons on hydrogen ..gamma.. + p ..-->.. X + p in the region 0.02 < (absolute value t) < 0.1 (GeV/c)/sup 2/, M/sub x//sup 2//s < 0.1. In this process, incident photons whose energies range from 70 to 140 GeV transform coherently to massive hadronic states in the mass range M/sub x/ < 5 GeV/c/sup 2/. We measure the inclusive differential cross section d/sup 2/sigma/dtdM/sub x//sup 2/. We use the Recoil Technique to determine the missing mass, M/sub x/, and the square of the 4-momentum transfer, t. The recoil detector, TREAD, is a cylindrical time projection chamber filled with high pressure hydrogen gas which serves both as the target and as the drift medium for the ionization track created by recoil protons. Concentric sense wires mounted on endplates sample different parts of the track, yielding the polar angle of the recoil. The energy of the recoil is determined by stopping the proton in scintillation counters located inside the high pressure vessel. We have found that the photon dissociation cross section exhibits exponential t dependence, falls as 1/M/sub x//sup 2/ with M/sub x//sup 2/ for high masses, M/sub x//sup 2/ > 4 (GeV/c/sup 2/)/sup 2/, and obeys a Factorization Rule. This behavior is consistent with that predicted by triple-Pomeron dominance. Furthermore, the application of a Finite Mass Sum Rule to the data indicates that the photon may have a ''direct'' hadronic interaction in addition to that described by the Vector Dominance Model of photon hadronic interactions.
- Research Organization:
- Rockefeller Univ., New York (USA)
- DOE Contract Number:
- AC02-81ER40033
- OSTI ID:
- 5470483
- Report Number(s):
- DOE/ER/40033-74; ON: TI85012089
- Resource Relation:
- Other Information: Thesis
- Country of Publication:
- United States
- Language:
- English
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Diffractive photon dissociation in a high pressure hydrogen time projection chamber
Diffraction dissociation of hadrons and photons on hydrogen. Report RU 81/A-28
Related Subjects
HADRONS
PHOTOPRODUCTION
PHOTON-PROTON INTERACTIONS
CALIBRATION
DATA ACQUISITION
DIFFERENTIAL CROSS SECTIONS
DIFFRACTION
EXPERIMENTAL DATA
FACTORIZATION
FOUR MOMENTUM TRANSFER
MISSING-MASS SPECTRA
MULTIPLICITY
PIONS
PROJECTION SPARK CHAMBERS
PROTON RECOIL DETECTORS
SUM RULES
TAGGED PHOTON METHOD
BASIC INTERACTIONS
BOSONS
COHERENT SCATTERING
COINCIDENCE METHODS
COUNTING TECHNIQUES
CROSS SECTIONS
DATA
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
EQUATIONS
GAS TRACK DETECTORS
INFORMATION
INTERACTIONS
MEASURING INSTRUMENTS
MESONS
MOMENTUM TRANSFER
NEUTRON DETECTORS
NUMERICAL DATA
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PHOTON-BARYON INTERACTIONS
PHOTON-HADRON INTERACTIONS
PHOTON-NUCLEON INTERACTIONS
PSEUDOSCALAR MESONS
RADIATION DETECTORS
SCATTERING
SPARK CHAMBERS
SPECTRA
645101* - High Energy Physics- Particle Interactions & Properties-Experimental- Electromagnetic Interactions & Properties