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    Cosmological implications of Compton tails in long duration GRB

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    The recent suggestion of the possible presence of a significant amount of material (Thomson optical depth ∼ 1) at rest and at a typical distance of ∼ 1015 cm with respect to the GRB is presented. The relevance of such interpretation for GRB energetics and its cosmological implications is outlined

    Measurement of correlations between pions from different W's in e+ e- -> W+ W- events

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    Correlations between pions from different W’s in e+e- +W+W- events are studied using data collected by the DELPHI detector at LEP running at a centre-of-mass energy of 172 GeV in 1996. At the present level of statistics, no enhancement of the correlation function above that expected from a pair of uncorrelated W’s is observed at small values of the four-momentum difference of the pions
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