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INGRID Analysis updates

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This report details the ongoing efforts to calculate and enhance the neutrino selection efficiency using Jnubeam, NEUT, and Detector MC. The current efficiency definition needs improvement to better consider neutrino interactions in the fiducial volume (FV). Significant focus is placed on tuning the Monte Carlo (MC) simulation to reflect physical realities, including the impact of scintillator bar dimensions and reflective material on hit efficiency. Collaboration with other working groups is emphasized, with updates to efficiency metrics being shared for systematic studies.

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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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