high-transverse-momentum charged-hadron production at the Tevatron
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1 (1/6) [ ], 29 Apr 2009 CDF Run II, s = 1.96TeV Observables: - incl. charged particle p T - trans. energy sum E T - C <pt > vs N ch What is new? Tracking system: - inner silicon - outer drift chamber(cot) - trans. mom resolution: σ(p T )/p T 0.1%p T /GeV Minimum bias trigg. - BBC Systematic uncertainties. Cuts: p T 0.4 GeV, η 1 Comparison with CDF data from power-law modeling: [ ] 9 Mar 2010 Albinio, Kniehl, Kramer [ ] 15 Mar 2010 Arleo, d Enterria, Yoos f = A po n p T +p 0 A po n p T +p + B 1 s 0 pt
2 (1/6) [ ], 29 Apr 2009 CDF Run II, s = 1.96TeV Observables: - incl. charged particle p T - trans. energy sum E T - C <pt > vs N ch What is new? Tracking system: - inner silicon - outer drift chamber(cot) - trans. mom resolution: σ(p T )/p T 0.1%p T /GeV Minimum bias trigg. - BBC Systematic uncertainties. Cuts: p T 0.4 GeV, η 1 Comparison with CDF data from power-law modeling: [ ] 9 Mar 2010 Albinio, Kniehl, Kramer [ ] 15 Mar 2010 Arleo, d Enterria, Yoos f = A po n p T +p 0 A po n p T +p + B 1 s 0 pt
3 (1/6) [ ], 29 Apr 2009 CDF Run II, s = 1.96TeV Observables: - incl. charged particle p T - trans. energy sum E T - C <pt > vs N ch What is new? Tracking system: - inner silicon - outer drift chamber(cot) - trans. mom resolution: σ(p T )/p T 0.1%p T /GeV Minimum bias trigg. - BBC Systematic uncertainties. Cuts: p T 0.4 GeV, η 1 Comparison with CDF data from power-law modeling: [ ] 9 Mar 2010 Albinio, Kniehl, Kramer [ ] 15 Mar 2010 Arleo, d Enterria, Yoos f = A po n p T +p 0 A po n p T +p + B 1 s 0 pt
4 (1/6) [ ], 29 Apr 2009 CDF Run II, s = 1.96TeV Observables: - incl. charged particle p T - trans. energy sum E T - C <pt > vs N ch What is new? Tracking system: - inner silicon - outer drift chamber(cot) - trans. mom resolution: σ(p T )/p T 0.1%p T /GeV Minimum bias trigg. - BBC Systematic uncertainties. Cuts: p T 0.4 GeV, η 1 Comparison with CDF data from power-law modeling: [ ] 9 Mar 2010 Albinio, Kniehl, Kramer [ ] 15 Mar 2010 Arleo, d Enterria, Yoos f = A po n p T +p 0 A po n p T +p + B 1 s 0 pt
5 (2/6) [ ], 29 Apr 2009 CDF Run II, s = 1.96TeV [ ] 9 Mar 2010 Albinio, Kniehl, Kramer [ ] 15 Mar 2010 Arleo, d Enterria, Yoos Observables: - incl. charged particle p T - trans. energy sum E T - C <pt > vs N ch What is new? Tracking system: - inner silicon - outer drift chamber(cot) - trans. mom resolution: σ(p T )/p T 0.1%p T /GeV Minimum bias trigg. - BBC Systematic uncertainties. Cuts: p T 0.4 GeV, η 1 Comparison with CDF data from power-law modeling: f = A po n p T +p 0 A po n p T +p + B 1 s 0 pt NLO QCD, using PDF and FF (fragm. functions) FF: AKK08, DSS, HKNS ren. and fact. scale: µ = kp T, µ f = k f p T, k, k f = 0.5, 1, 2 PDF: CTEQ6.6M, MSTW2008, HERAPDF0,1 Final state hadron s mass effects. gluon FF - less constrained then quark have no left-over adjustable parameters Factorization breaking in high-transverse-momentum charged-hadron production at the Tevatron? CMS (p T < 4) GeV?
6 (2/6) [ ], 29 Apr 2009 CDF Run II, s = 1.96TeV [ ] 9 Mar 2010 Albinio, Kniehl, Kramer [ ] 15 Mar 2010 Arleo, d Enterria, Yoos Observables: - incl. charged particle p T - trans. energy sum E T - C <pt > vs N ch What is new? Tracking system: - inner silicon - outer drift chamber(cot) - trans. mom resolution: σ(p T )/p T 0.1%p T /GeV Minimum bias trigg. - BBC Systematic uncertainties. Cuts: p T 0.4 GeV, η 1 Comparison with CDF data from power-law modeling: f = A po n p T +p 0 A po n p T +p + B 1 s 0 pt NLO QCD, using PDF and FF (fragm. functions) FF: AKK08, DSS, HKNS ren. and fact. scale: µ = kp T, µ f = k f p T, k, k f = 0.5, 1, 2 PDF: CTEQ6.6M, MSTW2008, HERAPDF0,1 Final state hadron s mass effects. gluon FF - less constrained then quark have no left-over adjustable parameters Factorization breaking in high-transverse-momentum charged-hadron production at the Tevatron? CMS (p T < 4) GeV?
7 (3/6) CDF incl. jet production vs CDF incl. charge particle jet = single hadron CDF charged particle spectra within jets for a dijet mass of GeV p t,jet 100 GeV 0.1% jets contain hadron carrying of jet 90% mom. BSM physics? Large x-section, ionising (electic or magnetic charge or large dipole mom.), not affect the dijet fragm.
8 (3/6) CDF incl. jet production vs CDF incl. charge particle jet = single hadron CDF charged particle spectra within jets for a dijet mass of GeV p t,jet 100 GeV 0.1% jets contain hadron carrying of jet 90% mom. BSM physics? Large x-section, ionising (electic or magnetic charge or large dipole mom.), not affect the dijet fragm.
9 (3/6) CDF incl. jet production vs CDF incl. charge particle jet = single hadron CDF charged particle spectra within jets for a dijet mass of GeV p t,jet 100 GeV 0.1% jets contain hadron carrying of jet 90% mom. BSM physics? Large x-section, ionising (electic or magnetic charge or large dipole mom.), not affect the dijet fragm.
10 (3/6) CDF incl. jet production vs CDF incl. charge particle jet = single hadron CDF charged particle spectra within jets for a dijet mass of GeV p t,jet 100 GeV 0.1% jets contain hadron carrying of jet 90% mom. BSM physics? Large x-section, ionising (electic or magnetic charge or large dipole mom.), not affect the dijet fragm.
11 (4/6) Questions: What kind of problems we might encounter measuring hight-pt charged particle in CDF? Can we check how these hight-pt charged particle events look like? [ ] May 2010, contribution of weak interaction? (I am checking it.)
12 (5/6) Solution to the mistery CDF: Charged p T Distribution Erratum November 18, 2010 Excess No excess events at at large p T p! T! 50 GeV/c! Published CDF data on the p T distribution of charged particles in Min-Bias collisions (ND) at 1.96 TeV compared with PYTHIA Tune A. CDF inconsistent with CMS and UA1! MPI@LHC 2010 Rick Field Florida/CDF/CMS Page 34 This is ok everyone makes mistakes - important is to understand what is going on!
13 (6/6) Solution to the mistery This is ok everyone makes mistakes - even MC authors ;). Important to check your analysis using more then one MC generator. And answer questions like: Is the effect I m seeing due to different models, or approximations, or is it a bug?
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