Small angle elastic scattering at the CERN proton-antiproton collider

Thesis/Dissertation · Sat Jan 01 04:00:00 EST 1983

OSTI ID:7001189

Gutierrez, P

The measurement of the proton antiproton elastic scattering angular distribution at a center of mass energy of 540 GeV is reported here. This measurement was performed at a center of mass energy ten times higher than any previous measurement. The measurement was performed at the CERN proton antiproton collider. The proton antiproton interactions were detected by a large general purpose detector, with 4..pi.. coverage. For the measurement of the elastic scattering distribution a set of eight small high resolution drift chambers in the forward arm of the detector were used. These drift chambers covered angles of less than 2 mrad. The drift chambers used in this measurement were read out in two orthogonal coordinates; drift time perpendicular to the sense wire and current division along the wire. With these chambers the authors were able to obtain a drift resolution of 110 ..mu..m and a current division resolution of 1.1 mm under test beam conditions. During the actual data taking the authors achieved resolutions of 134 ..mu..m and 3.6 mm in the drift plane and current division planes respectively. Elastic events were identified using the collinearity of the proton and antiproton tracks. Elastic events were found to be clean with at most one track accompanying the proton and antiproton. The elastic scattering distribution was measured for a four momentum transfer (t) range of 0.14 GeV/sup 2/ to 0.26 GeV/sup 2/. The distribution was found to be well fitted by exp(bt) with b = 13.3 +/- 1.5 GeV/sub 2/. This value is consistent with a In(s) increase over the ISR Collider energy range.

• Research Organization: California Univ., Riverside (USA)
• OSTI ID: 7001189
• Country of Publication: United States
• Language: English

Related Subjects

645101* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Electromagnetic Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
ANGULAR DISTRIBUTION
BARYON-BARYON INTERACTIONS
CERN SPS SYNCHROTRON
CYCLIC ACCELERATORS
DATA
DISTRIBUTION
DRIFT CHAMBERS
ELASTIC SCATTERING
ENERGY RANGE
EXPERIMENTAL DATA
FOUR MOMENTUM TRANSFER
GEV RANGE
GEV RANGE 100-1000
HADRON-HADRON INTERACTIONS
INFORMATION
INTERACTIONS
MEASURING INSTRUMENTS
MOMENTUM TRANSFER
MULTIWIRE PROPORTIONAL CHAMBERS
NUCLEON-ANTINUCLEON INTERACTIONS
NUMERICAL DATA
PARTICLE INTERACTIONS
PROPORTIONAL COUNTERS
PROTON-ANTIPROTON INTERACTIONS
RADIATION DETECTORS
SCATTERING
SYNCHROTRONS