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Background from pion beam interactions with LH2 pipes

Background from pion beam interactions with LH2 pipes. Only 34% of all pions make hit in START ! ( see Jacek presentation from last meeting ). Distribution of Pions at emission plane located -1.3 m downstream. Acceptance of beam line selects pions with D/p σ = 1.8%

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Background from pion beam interactions with LH2 pipes

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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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