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

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Backgrounds (NBG) & Trigger (εtrig) • Beam gas and beam halo: • Measure with unpaired bunches : 0.13% of total event sample • “Afterglow”: cavern radiation produced after a collision • Out-of-time afterglow measured by unpaired bunches • In-time afterglow measured from fractions of late hits in MBTS (0.4%) • Take 100% uncertainty on backgrounds:0.42% • Trigger is single MBTS trigger hit: • Measured with respect to offline selection to be 99.98% with an uncertainty of 0.09% LBL RPM 05/22/2012 Rate /Hz Rate /Hz 3 10 10 2 10 1 10 0.48 0.47 0.46 10 0.45 0.44 10 0.43 0.42 0.41 10 0.4 Afterglow ATLAS Preliminary Paired Unpaired (Beam 1) MBTS_C Unpaired Triggers(Beam 2) Data 2010 Unpaired bunches! -100 0 -80 500-601000 -40 -20 1500 02000 20 2500 40 60 3000 80 3500 100 3 2 CERN-THESIS-2011-046 Ncounter Ncounters = 1 CERN-THESIS-2011-046 = 2 Counter Time Bunch [ns] Id ATLAS Preliminary Paired Unpaired (Beam 1) MBTS_C Unpaired Triggers(Beam 2) Data 2010 0.39 1 0.38 -100800 -80 -60 1000-401200 -20 1400 0 20 1600 40 601800 80 100 2000 Counter Time Bunch [ns] Id 19
Modeling Detector Response • Evaluated agreement of data and MC for MBTS counter response • Inner Counters: use calorimeters as tag • Outer Counters: use tracks as tag • Use track or calorimeter cell to tag counter, define efficiency as fraction of tagged counters with Q over threshold. • Correct for extrapolation error (track) and neutral component (calo) • Adjust MC threshold to match observed efficiency in data • Systematic taken as MC threshold which reproduces efficiency in “worst” data counter • Done separately for +/- (η) sides and Inner, Outer counters LBL RPM 05/22/2012 20
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 20 and 21: Diffractive Models • Total detect
Page 24 and 25: 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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