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INGRID Analysis updates

INGRID Analysis updates. Neutrino selection efficiency. We calc the neutrino selection efficiency by Jnubeam & NEUT & Detector MC (not nd280 package).

aladdin-sharpe
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INGRID Analysis updates

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  1. INGRID Analysis updates

  2. Neutrino selection efficiency • We calc the neutrino selection efficiency by Jnubeam & NEUT & Detector MC (not nd280 package). • Send the efficiency table to other working group for some studies (http://www.t2k.org/nd280/ingrid/INGRID%20MC/Neutrino%20selection%20efficiency/2010.7.21/INGRID%20Efficiency%20study/view). • But, this efficiency is still veta version. • First, the definition is not good : ( # of events after selection / # of interactions in whole module.) • Need to consider neutrino interaction in FV. • MC tuning & study is not enough. • Detector MC is need to be tuned. • Cross-check this efficiency. • Every updating this efficiency, send the other groups. • Start to collaborate with other groups at some studies.

  3. MC tuning (changing) • There are some effects to be reflected on Detector MC. • We start to MC tuning from high priority for systematic study with Detector MC. • Dimension of scintillator bar • Neutrino interaction vertex

  4. Dimension of scintillator bar of MC • At current MC, which was used for calc the neutrino selection efficiency, the efficient area of a scintillator bar is whole scintillator bar. • In fact, the edge area is reflective material. So the area is not efficient. • Due to this inefficient area, the hit efficiency is dependent on track angle (studied by Christophe, Matsumura-san, Otani-san). • Need to reflect the effect on MC and study neutrino selection efficiency, some systematic errors, etc. Photo : surface of scintillator bar white area : the reflective material.

  5. Neutrino interaction vertex • At current MC, we generate neutrino interaction in only Fe planes, not tracking planes (scintillator planes). • The mass ratio of tracking planes to Fe planes is about 4~5 %. • According to vertex in tracking planes (x-plane or y-plane) or in Fe planes, the condition of generated charged particles is different, the reconstructed vertex is different. case 1 : vertex in Fe case 2 : vertex in x-plane case 3 : vertex in y-plane charged particle neutrino hit interact case1 Only at case 3 , reconstructed vertex is shifted next downstream tracking plane. In estimate some systematic errors, need to consider this effect. → need NEUT file to scintillator. case2 Fe x-plane y-plane interact case3

  6. Need to correct the definition of neutrino selection efficiency (consider # of interaction in FV). • We are tuning MC and check the effect. • After tuning & check, re-calc neutrino efficiency and study systematic error with new MC. • Need to announce every updating the neutrino selection efficiency.

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