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Impact of Flux Uncertainty on INGRID Neutrino Event Estimate

This study updates the effect of flux uncertainty on the number of observed neutrino events using the Murakami MC dataset with Jnubeam 10c. We focus on numu and numubar events and calculate weight factors based on energy spectra ratios. By comparing different beam scenarios, we estimate the discrepancies in event numbers and energy spectra, providing insights for neutrino selection procedures. The assessment includes adjustments for beam size and hadron production effects, contributing to a comprehensive evaluation of INGRID data.

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Impact of Flux Uncertainty on INGRID Neutrino Event Estimate

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  1. Update of Effect of flux uncertainty to Nobs of INGRID • A.Murakami

  2. MC data set to estimate # of observed neutrino events • Jnubeam 10c(GCALOR/GLUKA) with nominal beam → NEUT → INGRID MC → Select neutrino events with neutrino selection. • including numu, numubar (not including nue,nuebar) • Weight factors are obtained by the ratio of neutrino energy spectrum. • One is the ratio Φ(FLUKA2008 with real beam) / Φ(Jnubeam 10c with nominal beam) • One is the ratio Φ(Jnubeam 10c real beam) / Φ(Jnubeam 10c nominal beam) • The spectrum of FLUKA2008 with real beam is obtained from Jnubeam flux file. • The spectrum of Jnubeam 10c with real beam is obtained by weighting with proton beam position.

  3. Weighting with primary proton beam position nominal beam after weighting Nominal beam : Gaussian shape beam position = (0,0) [mm] beam size = (4.343,4.343) [mm] Real beam : calc by Kakuno-san. (Fitting w/ the single gaussian the accumulated beam profile) beam potision = (0.27, 0.85) [mm] beam size = (4.133,4.192) [mm] (detail is the p.9 of http://jnusrv01.kek.jp/Indico/getFile.py/access?contribId=0&resId=0&materialId=slides&confId=250) Weighting factor = the ratio of tho gaussian (real beam parameters)/(nominal beam parameters) the x-position of proton beam on the target [mm]

  4. Diff. of numu energy spectrum Diff. of numu observed in FV energy spectrum at module 3 Calc diff. of Nobs of INGRID. Diff. of A from B = (A-B)/B

  5. Diff. of numubar energy spectrum Diff. of numubar observed in FV energy spectrum at module 3 Calc diff. of Nobs of INGRID. Diff. of A from B = (A-B)/B

  6. Summary of Nobs. • To estimate Diff . due to beam size : • Diff. of (10c real) from (10c nomi) ~ 0.0 % • To estimate Diff. due to hadron producion : • Diff. of (FLUKA2008 real) from (10c real) ~ - 20.8% Nobs(Data:Run29-34) = 1.51 /1014POT

  7. Back up

  8. Diff. of Nobs at all modules (numu)

  9. Diff. of Nobs at all modules (numubar)

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