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Inclusive Jet Cross-Sections in Neutral Current DIS Events Using the Breit Frame

Inclusive Jet Cross-Sections in Neutral Current DIS Events Using the Breit Frame. Analysis Status. Marcos Jiminez Claudia Glasman Juan Terron Universidad Autonoma de Madrid. Jeff Standage York University Thomas Schoerner Hamburg University. Contents

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Inclusive Jet Cross-Sections in Neutral Current DIS Events Using the Breit Frame

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  1. Inclusive Jet Cross-Sections in Neutral Current DIS Events Using the Breit Frame Analysis Status Marcos Jiminez Claudia Glasman Juan Terron Universidad Autonoma de Madrid Jeff Standage York University Thomas Schoerner Hamburg University • Contents • Cross-section & NLO:Data ratio comparisons • Differences between two analyses – so far QCD Meeting, 10th March 2005Jeff Standage, York University

  2. Q2 JT/OG (DESY 02-112) 96-97 JS/TSS 98-00 MJ/CG/JT 99p-00 QCD Meeting, 10th March 2005Jeff Standage, York University

  3. ET(jet) JT/OG (DESY 02-112) 96-97 JS/TSS 98-00 MJ/CG/JT 99p-00 QCD Meeting, 10th March 2005Jeff Standage, York University

  4. η (jet) JT/OG (DESY 02-112) 96-97 JS/TSS 98-00 MJ/CG/JT 99p-00 QCD Meeting, 10th March 2005Jeff Standage, York University

  5. Differences Between JS/TS and MJ/CG/JT Analyses JS/TS MJ/CG/JT • Analysis code • Orange/phantom 2004a(.1,.2)Private EAZE job • Orange variables for cutsRelease 2004a.1 (pro) • Zufos/cells for offline jet finding • Noise Suppression (noise02s.fpp) • ecut(1) = 0.08ecut(1) = 0.10 • ecut(2) = 0.14ecut(2) = 0.15 • imbacut = 0.7imbacut = 0.9 • CAL corrections (escale03.fpp) • Individual RCAL cell correctionsNo RCAL cell by cell corrections • Global corrections - Global corrections - • FCAL HAC: 0.941FCAL HAC: 0.95 • FCAL EMC: 1.024FCAL EMC: 1.04 • BCAL HAC: 1.0962BCAL HAC: 1.08 • BCAL EMC: 1.05315BCAL EMC: 1.04 • RCAL HAC: 1.022RCAL HAC: 1.025 • RCAL EMC: 1.022RCAL EMC: 1.025 QCD Meeting, 10th March 2005Jeff Standage, York University

  6. Differences Between JS/TS and MJ/CG/JT Analyses JS/TS MJ/CG/JT • Vertex • Cell position corrected forCell position corrected for z-vertex only. • X,Y,Z vertices • Lepton beam energy • Orange: Ee = 27.56 GeVEe = 27.5 GeV • Offline: Ee = 27.52 GeV • Isolation (cone) cut • A cut is put on the electron candidate such that the total energy not associated with the candidate in a radius of R is eta-phi space is less than 10%. This removes photoproduction events and events where a jet remnant is falsely identified as the positron. • R = 0.8R = 0.7 • Sinistra electron • Electron corrected for dead material.Uncorrected Sinistra candidate is used. • Orange variable: Siecorr(3,1)Corresponds to SiCalEne(1) • Event variables • Orange variables being used, All values calculated directly from cells • e.g. SiQ2da(1), SiCeHMom(4,1) information. • Evidence of further orange corrections/differences. QCD Meeting, 10th March 2005Jeff Standage, York University

  7. Summary • Analysis differences lead to ~10% difference in events selected • Claudia had 992 events that I have rejected or have no jets. • I have 825 such events that Claudia doesn’t. • Analysis differences lead to complete discrepancy in number of jets in each event. • Have over-ridden orange routines to implement her analysis criteria. • Of those 992 events are still losing 20: • (i) 1 event: Q2 difference (2 cells have different energy). • (ii) 2 events: cosGammaHad. • (iii) 11 events: isolated cone cut (after moving to 0.7). • (iv) 6 events have no jets (still to look into jet finding). • not using orange jets! QCD Meeting, 10th March 2005Jeff Standage, York University

  8. Future steps • Nail down last few events cut differences. • Compare jet finding/boost procedure. • Repeat process for the hadron level in MC • (using JT/CG get_hadsys.fpp). • Compare acceptance corrections. • Jet energy corrections. • Cross-sections. • Decide which methods/corrections are the right ones (why)? QCD Meeting, 10th March 2005Jeff Standage, York University

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