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Bose-Einstein correlations in e+e- collisions

  • Author(s): Juricic, I
  • Goldhaber, G
  • Gidal, G
  • Abrams, G
  • Amidei, D
  • Baden, AR
  • Boyer, J
  • Butler, F
  • Carithers, WC
  • Gold, MS
  • Golding, L
  • Haggerty, J
  • Herrup, D
  • Kadyk, JA
  • Levi, ME
  • Nelson, ME
  • Rowson, PC
  • Schellman, H
  • Schmidke, WB
  • Sheldon, PD
  • Trilling, GH
  • Wood, DR
  • Barklow, T
  • Boyarski, A
  • Breidenbach, M
  • Burchat, P
  • Burke, DL
  • Cords, D
  • Dorfan, JM
  • Feldman, GJ
  • Gladney, L
  • Hanson, G
  • Hayes, K
  • Hitlin, DG
  • Hollebeek, RJ
  • Innes, WR
  • Jaros, JA
  • Karlen, D
  • Klein, SR
  • Lankford, AJ
  • Larsen, RR
  • Leclaire, BW
  • Lockyer, NS
  • L̈th, V
  • Ong, RA
  • Perl, ML
  • Richter, B
  • Riles, K
  • Ross, MC
  • Schindler, RH
  • Yelton, JM
  • Schaad, T
  • Schwitters, RF
  • et al.

Four data sets collected with the Mark II detector during its operation at the SPEAR and PEP e+e- storage rings at SLAC are used to study the Bose-Einstein correlation between pairs and triplets of like-sign charged pions. The data sets represent four different regions of energy available for hadron production: the J at s =3.095 GeV, typical hadronic energy of 5 GeV in two-photon events, and annihilation in the energy regions s =47 GeV above the J, and s =29 GeV. The Bose-Einstein correlation is studied as a function of Q2, the four-momentum difference squared of the pair, and of Q32, an analogous quantity defined for triplets. After corrections for Coulomb effects and pion misidentification, pair analyses indicate a nearly full Bose-Einstein enhancement (1) in the J and the two-photon data, and about half the maximum value in the two higher-energy data sets. The pair analysis parameter r lies within a band of ±0.1 fm around 0.7 fm and is essentially the same for all four data sets. Pion triplet analyses give consistent results for the triplet parameters 3 and r3. In an attempt to investigate the shape of the pion source, we also study the Bose-Einstein correlation in pion pairs using two-dimensional distributions in components of Q2. © 1989 The American Physical Society.

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