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Background decay length distribution for N=3 and N=4

Background decay length distribution for N=3 and N=4 selected photons. Nuclear Interactions switched on in the MC. N=3. N=4. regeneration. Nuclear interaction. Decay length distribution for REGENERATION and NUCLEAR INTERACTIONS for N=3 and N=4 selected photons. N=3. N=4.

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Background decay length distribution for N=3 and N=4

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  1. Background decay length distribution for N=3 and N=4 selected photons. Nuclear Interactions switched on in the MC. N=3 N=4 regeneration Nuclear interaction

  2. Decay length distribution for REGENERATION and NUCLEAR INTERACTIONS for N=3 and N=4 selected photons. N=3 N=4 Nuclear Interactions 5685 1880 regeneration 2745 932 1) In MC Regeneration+Nuclear Interactions >> DATA 2) In MC the Regeneration in DC wall ~ 2 Regeneration in BP 3) In DATA the peak at the Beam Pipe ~ 1.2 peak at DC wall

  3. In MC the Regeneration in DC wall ~ 2 Regeneration in BP: Is it correct? (reg) =  (reg)  NT

  4. In the Beam Pipe: 500m, 55% Al + 45% Be (reg) =  (reg)  NT

  5. NT(DC) = 6.6 1021/ cm2 NT(BP) = 4.6  1021/cm2 (regeneration, DC ) ~ 1.4   (regeneration, BP) in the Monte Carlo we found a factor ~ 2.

  6. N=3 N=4 nuclear interactions regeneration Assuming the same selection efficiencies and acceptance corrections for DATA and Monte Carlo I apply the following TENTATIVE weigths: 1) (regeneration, DC ) = (1.4/2)   (regeneration, BP) 2) (regeneration,DC or BP) in MC increased by a factor 1.5 3) (nuclear interactions in BP&DC) in MC decreased by a factor 0.3 Agreement DATA/MC at 15-20% level

  7. If I apply the Mario’s weights: 1) Nuclear Interactions in MC:  0.2 2) Regeneration in BP in MC:  1.5 3) Regeneration in DC in MC:  0.65 Deficit in MC with respect to DATA regeneration nuclear interactions

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