Determination of the jet energy corrections for b-jets using Z+b events (JME-13-001)

Abstract

We present an estimation of residual corrections to the b-jet energy scale using data from proton-proton collisions at a centre-of-mass energy of 8 TeV recorded by the CMS detector in 2012. We consider events where a b-jet and a Z boson with leptonic decay are balanced in the transverse plane. Making use of this balance and the precise measurement of leptons in CMS, the jet energy scale is calculated using two independent methods. The correction is obtained by comparing the jet energy scale in data and Monte Carlo simulation to account for possible differences. The final correction is calculated on top of the correction inclusive to all jet flavors. We obtain a final value of C_corr = 0.998 +/- 0.004 (stat) +/- 0.004 (sys) and we conclude no additional correction is needed for the b-jet energy scale.}

List of approved figures

Figures Caption
click on it to get it Fig. 1 Z boson p_T distribution for the b-tagged (left) and inclusive (right) selections. The MC distribution is normalized to the total number of events in data.
click on it to get it Fig. 1 Z boson p_T distribution for the b-tagged (left) and inclusive (right) selections. The MC distribution is normalized to the total number of events in data.
click on it to get it Fig 2. R_pT (left) and R_MPF (right) distributions for the b-tagged case; the mean of this distribution is extracted for data and Monte Carlo simulation to compute the response. The MC distribution is normalized to the total number of events in data.
click on it to get it Fig 2. R_pT (left) and R_MPF (right) distributions for the b-tagged case; the mean of this distribution is extracted for data and Monte Carlo simulation to compute the response. The MC distribution is normalized to the total number of events in data.
click on it to get it Fig 3. The alpha distribution for the b-tagged case; the bin at zero is populated by events containing only one jet according to the selection criteria. The MC distribution is normalized to the total number of events in data.
click on it to get it Fig 4. Overview of the result for C^inc (left), C^b (center), and the final result, C_corr (right), with all three cross-checks: MPF at face value (final result), MPF using a fit to extrapolate to alpha=0, R_pT (face value), and using a fit to extrapolate to \alpha=0 with R_pT. Systematic uncertainties for the b-tagged and inclusive only cases are extracted from CMS-DP-2013-033.
click on it to get it Fig 4. Overview of the result for C^inc (left), C^b (center), and the final result, C_corr (right), with all three cross-checks: MPF at face value (final result), MPF using a fit to extrapolate to alpha=0, R_pT (face value), and using a fit to extrapolate to \alpha=0 with R_pT. Systematic uncertainties for the b-tagged and inclusive only cases are extracted from CMS-DP-2013-033.
click on it to get it Fig 4. Overview of the result for C^inc (left), C^b (center), and the final result, C_corr (right), with all three cross-checks: MPF at face value (final result), MPF using a fit to extrapolate to alpha=0, R_pT (face value), and using a fit to extrapolate to \alpha=0 with R_pT. Systematic uncertainties for the b-tagged and inclusive only cases are extracted from CMS-DP-2013-033.
click on it to get it Fig 5. Inclusive and b-tagged jet energy correction (left) and their ratio (right) as a function of Z boson momentum.
click on it to get it Fig 5. Inclusive and b-tagged jet energy correction (left) and their ratio (right) as a function of Z boson momentum.

List of approved tables

click on it to get it Tab 1. Summary of the measurements performed using the different methods and techniques for protecting against the secondary jet activity.\label{tab:measurements.
click on it to get it Tab 2.Overview of systematic uncertainties.
click on it to get it Tab 3. Summary of results obtained with the different methods for the MADGRAPH+PYTHIA MC sample. The first uncertainty is the statistical uncertainty while the second is systematic.
click on it to get it Tab 4. Jet energy scale (MPF, face value) for the inclusive and b-tagged case and the final correction separately for data, MADGRAPH+PYTHIA MC and HERWIG++ MC.

-- PabloMartinez - 26 Sep 2014

Topic attachments
I Attachment History Action Size Date Who Comment
PDFpdf Cincref_vspt.pdf r1 manage 15.6 K 2014-09-26 - 09:13 PabloMartinez  
PNGpng Cincref_vspt.png r1 manage 54.0 K 2014-09-26 - 09:26 PabloMartinez  
PDFpdf Ctotal_vspt.pdf r1 manage 15.1 K 2014-09-26 - 09:43 PabloMartinez  
PNGpng Ctotal_vspt.png r1 manage 49.5 K 2014-09-26 - 09:26 PabloMartinez  
PDFpdf ResultOverview__final.pdf r1 manage 13.6 K 2014-09-26 - 09:13 PabloMartinez  
PNGpng ResultOverview__final.png r1 manage 40.7 K 2014-09-26 - 09:26 PabloMartinez  
PDFpdf ResultOverview__inclusive.pdf r1 manage 13.6 K 2014-09-26 - 09:13 PabloMartinez  
PNGpng ResultOverview__inclusive.png r1 manage 40.4 K 2014-09-26 - 09:26 PabloMartinez  
PDFpdf ResultOverview__reference.pdf r1 manage 13.6 K 2014-09-26 - 09:13 PabloMartinez  
PNGpng ResultOverview__reference.png r1 manage 40.2 K 2014-09-26 - 09:26 PabloMartinez  
PDFpdf Tabl1.pdf r1 manage 26.7 K 2014-09-26 - 10:10 PabloMartinez  
PNGpng Tabl1.png r1 manage 61.0 K 2014-09-26 - 10:10 PabloMartinez  
PDFpdf Tabl2.pdf r1 manage 40.6 K 2014-09-26 - 10:10 PabloMartinez  
PNGpng Tabl2.png r1 manage 90.0 K 2014-09-26 - 10:10 PabloMartinez  
PDFpdf Tabl3.pdf r1 manage 28.8 K 2014-09-26 - 10:10 PabloMartinez  
PNGpng Tabl3.png r1 manage 57.9 K 2014-09-26 - 10:10 PabloMartinez  
PDFpdf Tabl4.pdf r1 manage 22.5 K 2014-09-26 - 10:10 PabloMartinez  
PNGpng Tabl4.png r1 manage 46.8 K 2014-09-26 - 10:10 PabloMartinez  
PDFpdf alpha_pt_smaller_0p3_withratio.pdf r1 manage 24.6 K 2014-09-26 - 09:13 PabloMartinez  
PNGpng alpha_pt_smaller_0p3_withratio.png r1 manage 20.1 K 2014-09-29 - 14:02 PabloMartinez  
PDFpdf mpf_alpha_smaller_0p3_withratio.pdf r1 manage 18.2 K 2014-09-26 - 09:13 PabloMartinez  
PNGpng mpf_alpha_smaller_0p3_withratio.png r1 manage 19.6 K 2014-09-26 - 09:26 PabloMartinez  
PDFpdf ptZ_B_withratio.pdf r1 manage 17.5 K 2014-09-26 - 09:13 PabloMartinez  
PNGpng ptZ_B_withratio.png r1 manage 19.4 K 2014-09-26 - 09:26 PabloMartinez  
PDFpdf ptZ_withratio.pdf r1 manage 17.2 K 2014-09-26 - 09:13 PabloMartinez  
PNGpng ptZ_withratio.png r1 manage 18.3 K 2014-09-26 - 09:26 PabloMartinez  
PDFpdf ptb_over_ptz___alpha_smaller_0p3_withratio.pdf r1 manage 18.1 K 2014-09-26 - 09:13 PabloMartinez  
PNGpng ptb_over_ptz___alpha_smaller_0p3_withratio.png r1 manage 20.0 K 2014-09-26 - 09:26 PabloMartinez  
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