Bose-Einstein correlations in e/sup +/e/sup -/ collisions

Technical Report · Tue Dec 01 00:00:00 EST 1987

DOI:https://doi.org/10.2172/5188243· OSTI ID:5188243

Juricic, I

The MARK II detector is used to study the Bose-Einstein correlation between pairs and triplets of charged pions produced in hadronic decays of the J)psi), the ..sqrt..s = 4 to 7 GeV continuum above the J)psi), two photon events at ..sqrt..s = 29 GeV, and e/sup )plus/)e/sup )minus/) annihilation events at ..sqrt..s = 29 GeV as a function of Q/sup 2/, the four-momentum transfer squared. After corrections for Coulomb effects and pion misidentification, we find a nearly full Bose-Einstein enhancement ..cap alpha.. in the J)psi) and the two photon data and about half the maximum value in the other two data sets. The radius parameter )tau)(an average over space and time) given by pion pair analyses lies within a band of +-0.10 fm around 0.73 fm and is the same, within errors, for all four data sets. Pion triplet analyses also give a consistent radius of approx. 0.54 fm. fits to two-dimensional distributions R(q/sub T//sup 2/, q/sub C//sup 2/) of invariant components of Q/sup 2/ = q/sub T//sup 2/ )plus) q/sub C//sup 2/ give )tau)/sub T/ approx. )tau)C approx. )tau), where q/sub T/ is the transverse three-momentum difference calculated with respect to the net pair three-momentum, and q/sub C/ is in effect the longitudinal three-momentum difference in the pion pair rest frame. When q/sub T/ is calculated with respect to the jet axis for two-jet events in the e/sup )plus/)e/sup )minus/) annihilation data at ..sqrt..s = 29 GeV, a fit to R(q/sub T//sup 2/, q/sub C//sup 2/) also gives )tau)/sub T/ approx. )tau)/sub C/ approx. )tau). Noting that q/sub L/ and q/sub 0/ are not invariant, we make fits to R(/sub T//sup T/, q/sub L//sup 2/) and to R(q/sub T//sup 2/, q/sub 0//sup 2/) (Kopylov formulation), and we find )tau)/sub 0/ approx. )tau)/sub L/ approx. )23))tau)/sub T/ to )12))tau)/sub T/. 44 refs., 43 figs., 15 tabs

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5188243
• Report Number(s): LBL-24493; ON: DE88008207; TRN: 88-018159
• Resource Relation: Other Information: Thesis (Ph.D.)
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ELECTRON-POSITRON INTERACTIONS
CORRELATION FUNCTIONS
PIONS
PAIR PRODUCTION
BOSE-EINSTEIN STATISTICS
DATA ANALYSIS
DISTRIBUTION
DRIFT CHAMBERS
J PSI-3097 MESONS
LONGITUDINAL MOMENTUM
MEASURING METHODS
PION DETECTION
TRANSVERSE MOMENTUM
BOSONS
CHARGED PARTICLE DETECTION
CHARMONIUM
DETECTION
ELEMENTARY PARTICLES
FUNCTIONS
HADRONS
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
LINEAR MOMENTUM
MEASURING INSTRUMENTS
MESONS
MULTIWIRE PROPORTIONAL CHAMBERS
PARTICLE INTERACTIONS
PROPORTIONAL COUNTERS
PSEUDOSCALAR MESONS
QUARKONIUM
RADIATION DETECTION
RADIATION DETECTORS
VECTOR MESONS
645100* - High Energy Physics- Particle Interactions & Properties-Experimental