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Cross-sections ( m barn)

Cross-sections ( m barn). | h |<2.7. (*) Oren Y. and Nisati L. | h |<2.4. DPMJET default for rates computation (more conservative). Computation of maximum travel length. z max: pionDecayerIDETlength = 3500; // mm // default 3500 r max: pionDecayerIDETradius = 1200; // mm // default 1150

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Cross-sections ( m barn)

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  1. Cross-sections (mbarn) |h|<2.7 (*) Oren Y. and Nisati L. |h|<2.4 DPMJET default for rates computation (more conservative)

  2. Computation of maximum travel length • z max: • pionDecayerIDETlength = 3500; // mm // default 3500 • r max: • pionDecayerIDETradius = 1200; // mm // default 1150 • etaTr = (default) 1.67344 if (eta<etaTr) { maxTravel=pionDecayerIDETradius/sinTheta; } else { maxTravel=pionDecayerIDETlength/cosTheta; } • Note: Trygve weigth computation is valid only in the barrel (eta<etaTr)

  3. Procedure to compute cross-sections and compare histograms • Min bias & single pion: • binWidth: Eta=0.05 Pt=0.5GeV • minBiasXsec=80mbarn • multiplicity = nPrimary/n9999 (pi/K close to vertex divided mothers close to vertex with status 9999) • For single pion is 1, for minbias around 2-3 for pion, 3-4 for kaons • Depends on eta, pT cut • Close to vertex means |R|<0.05 z<150 • correction = # of pion selected per minbias events wrt minbias • For minbias is 1, for single pion 0.38 (averaged from the whole pT vs eta plot, so not depending from cuts while it should dependssystematic error) • totSampleEvents reweighted for decay probability (but I am not reweighting minbias events with kaon weight: to do) • singlepions=953940 minbias=113670

  4. Procedure to compute cross-sections and compare histograms • scale is used to rescale histograms and compare them • scale = totSampleEvents / correction / multiplicity / minBiasXsec • integral=events selected crossSection = integral / scale scale = scale * binWidthPt * binWidthEta

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