Bose-Einstein correlations in e+e- collisions.
نویسندگان
چکیده
Four data sets collected with the MARK II detector during its operation at the SPEAR and PEP e+e-storage rings 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 .7/lc, at ,/Z = 3.095 GeV, typical hadronic energy of M 5 GeV in two-photon events, and an-_ nihilation in the energy regions fi = 4-7 GeV above the J/$, and fi = 29 GeV. The Bose-Einstein correlation is studied as a function of Q2, the four-momentum difference squared of the pair, and of Qi, an analogous quantity defined for triplets. After corrections for Coulomb effects and pion misidentification, pair analyses indicate a nearly full Bose-Einstein enhancement (X NN 1) in the J/T) 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 ho.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 X3 and rg. 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.
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عنوان ژورنال:
- Physical review. D, Particles and fields
دوره 39 1 شماره
صفحات -
تاریخ انتشار 1989