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Pion absorption in NEUT

Pion absorption in NEUT. Danka Kielczewska, UCI Aug. 7, 2003. Because of the p 0 paper I’ve looked into pion absorption in the following NEUT ntuples:. For 1KT: /net/sukfs1/k2k/ktntpl/mc_v43/superlight /

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Pion absorption in NEUT

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  1. Pion absorption in NEUT Danka Kielczewska, UCI Aug. 7, 2003 Because of the p0 paper I’ve looked into pion absorption in the following NEUT ntuples: For 1KT: /net/sukfs1/k2k/ktntpl/mc_v43/superlight/ h2o.neut4.3.cho_cern_250nov50mzz_le5.r=300.101.kt.detsim.afit.rngcnt.rngcor.rngcor2.ntp As far as I understand they were used for spectrum analysis? For Super-K: the files from /home/atmpd/ntuple/apr03_spima11/ As far as I understand they were used for oscillation analysis

  2. Pion absorption in NEUT 4_5 (used by ATMPD group)- distributions of true MC pion momentum 3 CC channels with D production: hatched areas are for events with pionlessD decays:

  3. Pion absorption in NEUT 4_5 (used by ATMPD group)- distributions of true MC pion momentum 4 NC channels with D production: hatched areas are for events with pionlessD decays:

  4. Pion absorption in NEUT 4_3 (used for K2K spectrum analysis)- distributions of true MC pion momentum 3 CC channels with D production: hatched areas are for events with pionlessD decays:

  5. Pion absorption in NEUT 4_3 (used for K2K spectrum analysis)- distributions of true MC pion momentum 4 NC channels with D production: hatched areas are for events with pionlessD decays:

  6. Pion absorption in NEUT 4_5 (used by ATMPD group) Including events with DN-NN CC NC solid: p0 energy in elementary interaction dashed: p0 energy when exiting 16O Without events with DN-NN CC NC

  7. Pion absorption in NEUT 4_3 (used for K2K spectrum analysis) Including events with DN-NN solid: p0 energy in elementary interaction dashed: p0 energy when exiting 16O CC NC Without events with DN-NN It looks like p0 produced in NC reactions are not absorbed but only scattered elastically. CC NC

  8. Pion absorption in NEUT - conclusions Rates of p0 absorbed in 16O (including DN->NN): 1KT: ATMPD: CC: 47% 46% NC: 7% 43% ???? It seems that: As compared to pion absorption measurements on oxygen the above numbers 40-50% seem rather large. The 7% has to be a mistake.

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