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

Technical Report · Tue Dec 01 04:00:00 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 Lab., CA (USA)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5188243
• Report Number(s): LBL-24493; ON: DE88008207
• Country of Publication: United States
• Language: English

Related Subjects

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