Multidimensional HBT correlations in proton-antiproton collisions at root(s) = 630 GeV
H. C. Eggers, B. Buschbeck, F. J. October
Abstract
We analyse second moments R2 of like-sign pion pairs in the two-dimensional (qL,qT) and three-dimensional (qO,qS,qL) decompositions of the three-momentum difference. Conventional fit parametrisations such as gaussian, exponential, power-law and Edgeworth fail miserably, while more elaborate ones such as Levy do well but fail to yield a unique best-fit solution. A two-component model using a hard cut to separate small- and large-scale parts appears possible but not compelling. In all cases, the data exhibits a strong and hitherto unexplained peak at small momentum differences which exceeds current fits.
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