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Analysis of Pion Beam Interactions with LH2 Pipes and Particle Production Metrics

This study evaluates the interactions of a pion beam with LH2 pipes, revealing that only 34% of pions make a hit in the START detector. The emission plane for pions is located 1.3 m downstream, showcasing an acceptance selectivity of pions defined by D/pσ = 1.8%. Distinct distributions of primary and secondary particles at various vertices are examined, highlighting the structures of the LH2 pipes and benchmark channels. Approximately 19,000 and 21,000 events were reconstructed for the processes involving dilepton production and secondary interactions, respectively, from substantial event datasets.

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Analysis of Pion Beam Interactions with LH2 Pipes and Particle Production Metrics

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  1. Background from pion beaminteractions with LH2 pipes Only 34% of allpionsmake hit in START ! (see Jacek presentation from lastmeeting)

  2. Distribution of Pionsatemissionplanelocated -1.3 m downstream Acceptance of beamlineselectspionswith D/p σ = 1.8% Narrow in x and ratherbroad in Y with slightassymetryup-down PrimaryPionswhichmade START hit

  3. Vertex of secondaryparticleproduction (Y,Z) Z vs Y distribution: Pions (100k) emitted from -1.3 m; 80k secondaries START detectorlocatedat -0.38 m (-380 mm )

  4. Vertex of secondaryparticleproduction (X,Y) Y distribution: Pipes with LH2 visibleinside 20 mm diameter -22,22 mm – tube X vs Y distribution: LH2 pipes and tubeareclearlyvisible

  5. Benchmark channel -pn+ - n GRAPHICAL pion PID CUT

  6. Benchmark channel -pn+ - n About 19 keventsreconstructed from 100 kevents

  7. Dileptonchannel -pne+e- n About 21 keventsreconstructed from 200 kevents

  8. Backgroundsimulation 7eventsreconstructed from 1 Meventsbackground

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