Results From The HARP Experiment

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1 Results From The HARP Experiment Lara Howlett University of Sheffield Overview of HARP and forward analysis Al analysis for K2K experiment Be analysis for MiniBooNE experiment

2 Motivations Systematic study of hadron production Beam momenta from GeV/c Targets from H to Pb Input for: Calculation of fluxes for conventional neutrino beams Neutrino factory design Atmospheric neutrino flux calculations Input for Monte Carlo hadronic generators

3 Experimental Setup

4 K2K Motivation To be measured by HARP One of the largest systematic uncertainties on oscillation parameters comes from the near/far ratio 97% of K2K neutrino flux comes from π->µ+ν µ HARP result covers.75<p π <6.5 GeV/c 3<θ π <21mrad Beam MC Beam MC confirmed by Pion Monitor.5 E <.75 GeV < ν

5 MiniBooNE motivation 9% of MiniBooNE neutrino flux comes from π->µ+ν µ HARP result covers.75<p π <6.5 GeV/c 3<θ π <21mrad More than 8% of the relevant pions come from this region

6 Cross Section Number of protons on target Physics constants for target properties Correction matrix including: 2 d σ α 1 A 1 α = M ijαi j α Ni j i θ j N pot N Aρt dp d Momentum resolution Geometrical acceptance Reconstruction efficiency Particle identification efficiency and migration Particles Observed

7 Tracking σ p (GeV/c) 1.5 P 2 (GeV/c) P(GeV/c) 1 6 P 4 (GeV/c) σ θ (mrad) P 4 (GeV/c) P(GeV/c) P(GeV/c) Momentum resolution measured using 3 methods Empty target data Elastics TOF Two independent methods to reconstruct tracks Vertex2 3D track segment downstream plus vertex match Vertex4 3D track segment downstream plus 3D segment NDC1

8 Efficiency θ x (rad) θ y (rad) Tracking efficiency computed from the data Excellent agreement between MC and data Drop at large positive θ x due to geometric acceptance P(GeV/c) For negative θ x efficiency is flat below 4GeV/c

9 Particle ID fraction of particles fraction of particles N phe N phe events events β β

10 Results - Al Double differential π cross section for 12.9GeV/c protons hitting a 5%λ Al target Dotted line shows best fit to Sanford Wang parameterisation

11 Errors - Al Typical error 8.2% on double differential cross section Dominant errors: overall normalisation, momentum scale and secondary interactions

12 K2K Analysis Far/near flux ratio predictions from HARP Cho-CERN and PIMON Three predictions are consistent Red: errors from HARP based evaluation, Blue: previous error estimate HARP gives ~ factor 2 error reduction across all energies

13 Results - Be Double differential π cross section for 8.9GeV/c protons hitting a 5%λ Be target

14 Errors - Be Typical error 13.% on double differential cross section Dominant errors: overall normalisation, statistics, momentum reconstruction and secondary interactions

15 Conclusions / Outlook Precision ν studies require a precise knowledge of ν production HARP Al results have been published and incorporated into K2K final oscillation analysis HARP results give a factor of 2 reduction in errors on F/N ratio predictions HARP Be results are close to completion and should be published later this year. These results will be used in MiniBooNE oscillation analyses HARP measurements have started to fill an important gap in ν flux predictions

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