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Interaction point analysis Judgment / March 10, 2009 Yoshiaki Nonoyama Nagoya Univ.
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3D Event Viewer : demo
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x z beam x y Neutrino beam Event: 228913162 Brick: 29373 Type: CC
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X-Z projection Y-Z projection
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e-pair Event: 229123946 Brick: 23114 Type: CC Minimum-distance = 1.4 m x z
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e-pair x 4 Event: 234588892 Brick: 143174 Type : CC x z Vertex
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Minimum-distance of any two tracks all electrons from 0 Under analysis(measure momentum..) mm 17 events 119 combinations It is possible to separate origin of 0, where from 1ry or kink point.
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Topology -- Kink → e- → e- 17.8 % → μ- → μ- 17.4 % → h - → - ) 49.5 % (25 % ) Trident → h - h - h + 15.2 % Principle of detecting tau neutrino -, e -, h - h h cτ = 87 micron Tau life time short impact parameter to vertex is small nuclear emulsion (sub um resolution) nuclear emulsion (sub um resolution) Feature of neutrino tau event -No lepton except tau at 1ry vertex -A decay candidate consistent with tau
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τ detection category Long flight decay :3 0% Short flight decay :7 0% θ kink > 20mrad pt > 250Mev IP > 5um Min_pt > 250Mev IP
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OPERACHORUS OPERACHORUS Momentum measurement YesNo 0 detection GoodBad Kink point NoYes Lead (1mm) Film(300 m) Film(700 m) kink OPERA ECC can be measure momentum itself and detecting 0. -> It is possible to reject 2ry interaction by Pt cut and detecting
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Summary OPERA ECC can confirm tau-neutrino interaction if the tau decay impact-parameter more than 5 m. OPERA ECC has high-power for detecting hadronic decay channel. Because… The momentum can be measured by MCS. –> reject 2ry interaction Possible to judge the origin of 0 (1ry vertex or kink). –> High potential detection
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