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Enhanced Analysis of FPS/LPS Combination: Procedural Details & Systematic Uncertainties

This update delves into the enhanced analysis of the FPS/LPS combination, focusing on procedural details and systematic uncertainties. The study examines various factors such as swimming factors, bin center corrections, and normalization uncertainties, distinguishing between additive and multiplicative treatments. Correlations between H1 and ZEUS datasets are explored, particularly related to energy scales, background subtraction, xIP reweighting, and t-reweighting. Different averages are calculated considering correlation scenarios. The analysis offers insights into the impact of uncertainties on the final results, with average effects ranging from 1-4%. Specific attention is given to restricted t-regions in both H1 and ZEUS datasets.

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Enhanced Analysis of FPS/LPS Combination: Procedural Details & Systematic Uncertainties

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  1. Update onFPS/LPS Combination M. Kapishin, M. Ruspa, V. Sola • NominalFit • ProceduralUncertainties • tRange

  2. FPS+LPS - Nominal Fit Free Normalization WA -> χ2 = 51 / 58 = 0.88 fit -> χ2 = 48 / 58 = 0.83 Fit to systematics 1 HadEn_h1 -1.7338 0.6385 2 ElecEn_h1 0.8766 0.8972 3 ElecTh_h1 0.5426 0.7505 4 DifBeta_h1 0.2229 0.9307 5 DifXpom_h1 0.0056 0.9882 6 DifT_h1 0.7551 0.8295 7 EpFPS_h1 0.3380 0.5042 8 PxFPS_h1 0.2392 0.8268 9 PyFPS_h1 -0.3385 0.9080 10 DifQ2_h1 0.1734 0.9834 11 VtxEff_h1 -0.0268 0.9815 12 Backgr_h1 -0.3517 0.9268 13 Bcccor_h1 0.0556 0.9144 14 Norm_h1 0.7158 0.8866 15 Escale_zeus 0.4728 0.7736 16 Pdiss_zeus 0.3851 0.9591 17 xIPweight_zeus -0.0863 0.9900 18 Tweight_zeus -0.1672 0.9069 19 Norm_zeus -1.0736 0.7201 FPS+LPS - 13/05/2011

  3. FPS+LPS - 13/05/2011

  4. FPS+LPS - 13/05/2011

  5. Ratio WA/SGfit FPS+LPS - 13/05/2011

  6. Procedural Uncertainties • Swimming factors ZEUS (waiting for swimming factors from H1 Fit B - Sasha) • Bin centre corrections H1 (not yet) • Additive VS Multiplicative (done) • -> only normalization uncertainties are taken as multiplicative while • all other uncertainties are treated as additive • Correlations between H1 and ZEUS (done) • Similar systematic uncertainties identified • -> energy scales • -> background subtraction • -> xIP reweighting • -> t reweighting • 24 different averages are calculated assuming each of the 4 pair to be • correlated or uncorrelated FPS+LPS - 13/05/2011

  7. Ratio nominal case to case with all uncertainties additive FPS+LPS - 13/05/2011

  8. Ratio energy scales uncorrelated cross exp. (nominal) to case with energy scales correlated FPS+LPS - 13/05/2011

  9. Ratio nominal case to case with bgd subtraction+ xIP weight + t weight correlated FPS+LPS - 13/05/2011

  10. Procedural Uncertainties • Swimming factors ZEUS (waiting for swimming factors from H1 Fit B - Sasha) • Bin centre corrections H1 (not yet) • Additive VS Multiplicative (done) • -> only normalization uncertainties are taken as multiplicative while • all other uncertainties are treated as additive • Average effect ~ 4% (tbc) • Correlations between H1 and ZEUS (done) • Similar systematic uncertainties identified • -> energy scales • Average effect ~ 2 % and up to 10% for lower xIP bins (tbc) • -> background subtraction • -> xIP reweighting • -> t reweighting • Average effect ~ 1-2 % (tbc) FPS+LPS - 13/05/2011

  11. Restricted t Regions Brief summary H1: t-range = [0.1 - 0.7] GeV2, B ~ 6 GeV-2 varying with xIP, algebricalintegration [tmin- 1] ZEUS: t-range = [0.09 - 0.55] GeV2, B = 7 GeV-2, integration hidden in acceptance corr Inputs from Misha - H1 f2d3 integrated from f2d4 in the H1 t-range - H1 f2d3 integrated from f2d4 and extrapolated to the ZEUS t-range - correction factors for 7 xIP bins for "ZEUS" t-slope 7 GeV-2 from [0.1 - 0.7] to [tmin - 1] - correction factors for 7 xIP bins for "ZEUS" t-slope 7 GeV-2 from [0.09 - 0.55] to [tmin - 1] Average ratios (Misha) - H1 t-range -> H1 / ZEUS ~ 0.94 +/- 0.02 - ZEUS t-range -> H1 / ZEUS ~ 0.91 +/- 0.02 (using the stat+syst errors of the H1 and ZEUS data - except for the normalisationunc) Fit in the ZEUS t-range -> χ2 = 53 / 58 = 0.91 (H1 norm = 4.5%, ZEUS norm = 7%) FPS+LPS - 13/05/2011

  12. FPS+LPS - 13/05/2011

  13. FPS+LPS - 13/05/2011

  14. FPS+LPS - 13/05/2011

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