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Interaction point analysis Judgment n m / n t

Interaction point analysis Judgment n m / n t. March 10, 2009 Yoshiaki Nonoyama Nagoya Univ. 3D Event Viewer : demo. y. Neutrino beam. x. beam. x. z. Event: 228913162 Brick: 29373 Type: CC. X-Z projection. Y-Z projection. Event: 229123946 Brick: 23114 Type: CC.

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Interaction point analysis Judgment n m / n t

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  1. Interaction point analysisJudgment nm / nt March 10, 2009 Yoshiaki Nonoyama Nagoya Univ.

  2. 3D Event Viewer : demo

  3. y Neutrino beam x beam x z Event: 228913162 Brick: 29373 Type: CC

  4. X-Z projection Y-Z projection

  5. Event: 229123946 Brick: 23114 Type: CC Minimum-distance = 1.4mm m x e-pair z

  6. e-pair x 4 x Vertex z m Event: 234588892 Brick: 143174 Type : CC

  7. Minimum-distance of any two tracks 17 events 119 combinations all electrons from p0 It is possible to separate origin of p0, where from 1ry or kink point. Under analysis(measure momentum..) mm

  8. Principle of detecting tau neutrino Topology nt cτ = 87 micron nt m-, e-, h- t- h h • Tau life time short  impact parameter to vertex is small •  nuclear emulsion (sub um resolution) • Feature of neutrino tau event • No lepton except tau at 1ry vertex • A decay candidate consistent with tau

  9. τ detection category Short flight decay　　　：７０％ IP > 5um Min_pt > 250Mev IP Long flight decay 　 ：３０％ q θkink > 20mrad pt > 250Mev

  10. OPERA CHORUS kink kink Film(700mm) Film(300mm) Lead (1mm) OPERA ECC can be measure momentum itself and detecting p0. -> It is possible to reject 2ry interaction by Pt cut and detecting r.

  11. Summary • OPERA ECC can confirm tau-neutrino interaction if the tau decay impact-parameter more than 5mm. • 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 p0(1ry vertex or kink). • > High potential r detection

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