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What is E x point for R=N  all /N  direct =1?

A-single-  study using Pythia. What is E x point for R=N  all /N  direct =1? With VETO, Without VETO (VETO: Large cells) Pythia condition: MSELL=0, MSUB=(11,12,13,28,53,68,81,82,86,87,88,89,92,93,94,95,1,2) and ( 14,18,29,114,115).  inelastic =41.12 [mb]

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What is E x point for R=N  all /N  direct =1?

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  1. A-single- study using Pythia • What is Ex point for R=Nall/Ndirect=1? • With VETO, Without VETO (VETO: Large cells) • Pythia condition: • MSELL=0, • MSUB=(11,12,13,28,53,68,81,82,86,87,88,89,92,93,94,95,1,2) and (14,18,29,114,115). • inelastic=41.12 [mb] • CKIN(5)=1,CKIN(6)=1,CKIN(3)=0,CKIN(4)=-1. • Select “A single  events” • Acceptance: FPD++ small cells • VETO FPD++ large cells (See page 2) • Results • Without VETO EX=43 GeV (Intersecting point of black and pink histograms in page 3) • With VETO EX=26 GeV (This value can be improved by better choices for "acceptance" and "veto“).

  2. Acceptance (Small cells) Veto (Large cells)

  3.  from 0 (Without VETO)  from (Without VETO) Direct- E 43 GeV A single  events in acceptance (FPD++ inner cells) Pythia simulation L=0.9 pb-1 3.81010 calls  from 0 (With VETO) WITHOUT VETO Intersecting point of black and pink histograms

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