Considering the Haystack: the pp Inelastic Cross ... - Physics Division

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Diffractive Models • Total detector acceptance depends on MX distribution near ξ cut • But we can’t measure MX! • Use a variety of models to assess dependence on MX distribution Measurement (MX > 15.7 GeV) arXiv:1005.3894 LBL RPM 05/22/2012 • Consider many models for <strong>the</strong> diffractive mass distribution • Generators: Pythia, Phojet • 2 different fragmentation schemes (Pythia 6 vs Pythia 8) • Flat • Multiple variations of power law • Default model is Donnachie and Landshoff with ε = 0.085, α’= 0.25 GeV -2 : d⇤SD / dM 2 ⇣ s M (t) =⇥ + 0 (t) ⌘ 2 (t) 1 ✓ 1+ ◆ 2 M s 15
Monte Carlo Models of Particle Production • Pythia 6: String fragmentation to produce particles for given MX • Pythia 8: Perturbative particle production using pomeron PDFs for MX > 10 GeV • Default MC for this measurement • Multiple models for differential diffractive spectrum • Phojet: Dual Parton Model with cutoff to separate hard and soft diffractive processes LBL RPM 05/22/2012 16
Page 1 and 2: Considering the Haystack: the pp In
Page 3 and 4: Revisiting the Past LBL RPM 05/22/2
Page 5 and 6: LHC: The Energy Frontier ATLAS LBL
Page 7 and 8: Why Measure the pp cross section?
Page 9 and 10: The Total and Elastic Cross Section
Page 11: ATLAS LBL RPM 05/22/2012 10
Page 14 and 15: ATLAS Inner Tracking Detector: ★S
Page 16 and 17: Outline • Soft Physics at the Ene
Page 18 and 19: Single Dissociation Example of SD e
Page 24 and 25: Backgrounds (NBG) & Trigger (εtrig
Page 26 and 27: Backgrounds (NBG) & Trigger (εtrig
Page 28 and 29: Modeling Detector Response • Eval
Page 30 and 31: Modeling Detector Response • Eval
Page 32 and 33: Modeling Detector Material • Mate
Page 34 and 35: Inclusive Event Sample: N ev MBTS c
Page 36 and 37: Relative Diffractive Contribution
Page 38 and 39: MC Uncertainties on εsel and fξ
Page 40 and 41: Summary of Systematic Uncertainties
Page 42 and 43: Luminosity Basics • Luminosity is
Page 44 and 45: ATLAS Luminosity Detectors Track an
Page 48 and 49: Extrapolating to σinel • To comp
Page 50 and 51: Fall 2011 • ALICE & CMS measured
Page 54 and 55: Constraining CR Models http://indic
Page 56 and 57: Conclusions • Have made the first
Page 58 and 59: Additional Slides
Page 60 and 61: Creating a diffraction enhanced •
Page 62 and 63: trk d N d Rapidity Gaps ev N 1 Rati
Page 64 and 65: trk d N d Rapidity Gaps ev N 1 Rati
Page 66 and 67: ] -2 [GeV trk N d p 2 d Ratio(MC/Da
Page 68 and 69: ] -2 [GeV trk N d p 2 d Ratio(MC/Da

Considering the Haystack: the pp Inelastic Cross ... - Physics Division

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