3+1 tau decay event

3+1 tau decay event

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Caption: Computer display of a "3+1" tau decay in the TASSO detector at the DESY particle physics laboratory, Hamburg. The display shows a cross-section through the detector. An electron & a positron accelerated in DESY's PETRA collider have met & annihilated at the centre, their energy materialing as a tau particle & an antitau. The tau & antitau live too briefly to be visible themselves, but reveal their presence when they decay, the tau to 2 invisible neutrinos & a positive muon (single red track), & the antitau to 3 three charged pions (red tracks, top) & an invisible neutrino. The tau is a lepton, a heavy version of the electron & the muon.

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Keywords: computer screen, desy, electronic display, lepton, muon, particle physics research, pion, tasso experiment, tau particle

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