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Options for WC calibrations

Options for WC calibrations. Shoei NAKAYAMA (ICRR) Aug 1, 2004 @ 2km meeting. Dominant systematic errors. Fiducial volume (vertex fitter) in n m disappearance analysis the number of n events is important Ring counting in n e appearance search

georgehernandez
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Options for WC calibrations

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  1. Options for WC calibrations Shoei NAKAYAMA (ICRR) Aug 1, 2004 @ 2km meeting

  2. Dominant systematic errors • Fiducial volume (vertex fitter) • in nm disappearance analysis • the number of n events is important • Ring counting • in ne appearance search • the number of BG events to ne signals, 1ring p0 events, strongly depends on the ring counting.

  3. Fiducial volume • Calibration source : n events ? cosmic m events ? cosmic m n Cosmic m events have different event topologies from those of neutrino events.  difficult to use

  4. Fiducial volume calib. (option1) • dividing the tank into two parts • Merit : high event rate • Demerit : how to set the curtain ? how about a light shield ? can not limit the vertex in X and Y direction. (also in Z direction ???) Black curtain

  5. Fiducial volume calib. (option2) • sinking a box surrounded by scintillators • merits : can limit the vertex Z position precisely. easy to handle (insert from top of the tank). • demerits : very low event rate. 10 events / day ? 1m x 1m x 1m veto veto veto muon veto veto

  6. Fiducial volume calib. (others) • Can we use scintillating fibers to determine the vertex ???

  7. Ring counting • Not easy … • Using fake Cherenkov-light generators is one and only possibility I can imagine at the present moment. • Use the same system in 2km and SK.  compare their responses diffuser cone ? light source want to produce a fake e-like ring

  8. Summary • We have no concrete proposals yet for calibrations of fiducial volume and ring counting. • We need more ideas !!

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