Measurement of the Inclusive Production Cross Sections for Forward Jets and for Dijet Events with One Forward and One Central Jet in pp Collisions at $\sqrt{\rm{s}} = $7 TeV

Abstract

The inclusive production cross sections for forward jets, as well for jets in dijet events with at least one jet emitted at central and the other at forward pseudorapidities, are measured in the range of transverse momenta $p_T = 35-150$ GeV/c in proton-proton collisions at $\sqrt{\rm{s}}$ = 7 TeV by the CMS experiment at the LHC. Forward jets are measured within pseudorapidities $3.2 < |\eta| < 4.7$, and central jets within the $|\eta| < 2.8$ range. The differential cross sections $d^{2}\sigma/dp_T d\eta$ are compared to predictions from three approaches in perturbative quantum chromodynamics: (i) next- to-leading-order calculations obtained with and without matching to parton-shower Monte Carlo simulations, (ii) PYTHIA and HERWIG parton-shower event generators with different tunes of parameters, and (iii) CASCADE and HEJ models, including different non-collinear corrections to standard single-parton radiation. The single-jet inclusive forward jet spectrum is well described by all models, but not all predictions are consistent with the spectra observed for the forward-central dijet events.

Paper Plots from FWD-11-002 (click on plot to get .pdf)

Figure Caption
Expected_HF_Jet_pT_crossection_CaloJet_AKt05_for_3dot14_invpb.pdf Measured differential cross sections for jets as a function of $p_T$, before unfolding the energy resolution (black dots), compared to detector-level MC simulations generated with PYTHIA and HERWIG (histograms) for inclusive forward jets.

central_all_pt.pdf Measured differential cross sections for jets as a function of $p_T$, before unfolding the energy resolution (black dots), compared to detector-level MC simulations generated with 3 different versions of PYTHIA and HERWIG (histograms) for central jets in dijet events.

forward_all_pt.pdf Measured differential cross sections for jets as a function of $p_T$, before unfolding the energy resolution (black dots), compared to detector-level MC simulations generated with 3 different versions of PYTHIA and HERWIG (histograms) for forward jets in dijet events.

Plot_Correction_Factors_For_Herwig_and_Pythia_Calo.pdf The bin-by-bin unfolding correction factors as a function of $p_T$ for inclusive forward jets. Panel shows the individual correction factors obtained with PYTHIA 6 and HERWIG 6. The hatched band represents the uncertainties assigned to the correction factors.

central_factor.pdf The bin-by-bin unfolding correction factors as a function of $p_T$ for central jets in dijet events. Figure shows the average values obtained for the two MC generators (black histograms).The hatched band represents the uncertainties assigned to the correction factors.

forward_factor.pdf The bin-by-bin unfolding correction factors as a function of $p_T$ for forward jets in dijet events. Figure shows the average values obtained for the two MC generators (black histograms).The hatched band represents the uncertainties assigned to the correction factors.

cTotalExpUncert.pdf Systematic uncertainties as a function of jet $p_T$ for inclusive forward production. The outer limits of the grey areas show the overall uncertainties, from adding in quadrature uncertainties from the JES, the unfolding and the luminosity.

central_total_systematics.pdf Systematic uncertainties as a function of jet $p_T$ for central jet spectra in dijet events. The outer limits of the grey areas show the overall uncertainties, from adding in quadrature uncertainties from the JES, the unfolding and the luminosity.

forward_total_systematics.pdf Systematic uncertainties as a function of jet $p_T$ for central jet spectra in dijet events. The outer limits of the grey areas show the overall uncertainties, from adding in quadrature uncertainties from the JES, the unfolding and the luminosity.

cTotalTheoryUncert.pdf Uncertainties on the predicted NLO inclusive forward jet spectrum. Plot shows the contributions from non-perturbative effects, choice of PDF and the value of the strong cou- pling αS (computed with the PDF4LHC prescription), and uncertainties associated with the renormalization and fragmentation scales.

cTotalTheorywithHerapdfUncert.pdf Uncertainties on the predicted NLO inclusive forward jet spectrum. Plot shows the uncertainties from NP, PDF and $\alpha_s$ (obtained with HERAPDF1.0), and the theoretical scales. Total uncertainties are obtained by adding quadratically the uncertainties on NP, PDF and the scales.

Expected_HF_Jet_crossection_CaloJet_data_fNLO_AKt05.pdf Inclusive jet cross section at forward pseudorapidities fully corrected and unfolded, compared to particle-level predictions from PYTHIA 6, PYTHIA 8, HERWIG 6, NLOJET++ corrected for non-perturbative effects, POWHEG, CASCADE and HEJ.

c_dsigma_dpT_HF_and_JES_uncert_with_Lines.pdf Ratio of theory/data for the forward jet spectrum. The dark band shows the theoretical uncertainty on the NLO predictions.

fnl2222b_pdfcomp1_bin1_fwd-11-002.pdf Ratio of the inclusive forward jet spectrum for data over the NLO predictions using the CT10 PDF, as a function of $p_T$, shown with the statistical (error bars) as well as systematic uncertainties (grey band). Additional predictions are shown for all the central PDF prdictions (curves).The corresponding PDF uncertainties are shown as coloured bands around the ratios.

fnl2222b_pdfcomp2_bin1_fwd-11-002.pdf Additional predictions are shown for for the MSTW2008 and NNPDF2.1 sets. Common theoretical uncertainties from choices of scale and non-perturbative corrections are indicated by dashed (magenta) curves.

fnl2222b_pdfcomp3_bin1_fwd-11-002.pdf Additional predictions are shown for the HERAPDF1.0 and ABKM09 PDF. Common theoretical uncertainties from choices of scale and non-perturbative corrections are indicated by dashed (magenta) curves.

central_XS_pythia.pdf Differential cross sections as a function of jet $p_T$ for dijet events with at least one central jet and one forward jet, compared to predictions from several models. The error bars on all data points (which are smaller than the size of the markers) reflect just statistical uncertainties, with systematic uncertainties plotted as grey bands.

forward_XS_pythia.pdf Differential cross sections as a function of jet $p_T$ for dijet events with at least one central jet and one forward jet, compared to predictions from several models. The error bars on all data points reflect just statistical uncertainties, with systematic uncertainties plotted as grey bands.

central_XS_herwig.pdf Differential cross sections as a function of jet $p_T$ for dijet events with at least one central jet and one forward jet, compared to predictions from several models. The error bars on all data points (which are smaller than the size of the markers) reflect just statistical uncertainties, with systematic uncertainties plotted as grey bands.

forward_XS_herwig.pdf Differential cross sections as a function of jet $p_T$ for dijet events with at least one central jet and one forward jet, compared to predictions from several models. The error bars on all data points reflect just statistical uncertainties, with systematic uncertainties plotted as grey bands.

central_ratio_XS_pythia.pdf Ratio of theory to data for differential cross sections as a function of $p_T$, for central jets produced in dijet events. The error bars on all data points reflect just statistical uncertainties, with systematic uncertainties plotted as grey bands.

forward_ratio_XS_pythia.pdf Ratio of theory to data for differential cross sections as a function of $p_T$, for forward jets produced in dijet events. The error bars on all data points reflect just statistical uncertainties, with systematic uncertainties plotted as grey bands.

central_ratio_XS_herwig.pdf Ratio of theory to data for differential cross sections as a function of $p_T$, for central jets produced in dijet events. The error bars on all data points reflect just statistical uncertainties, with systematic uncertainties plotted as grey bands.

forward_ratio_XS_herwig.pdf Ratio of theory to data for differential cross sections as a function of $p_T$, for forward jets produced in dijet events. The error bars on all data points reflect just statistical uncertainties, with systematic uncertainties plotted as grey bands.

Paper Table

Measured $p_T$-dependent differential cross sections for inclusive forward jets (second column), and for central (third column) and forward (last column) jets in dijet events. The first (second) uncertainty reflects the statistical (systematic) contribution.

Table.pdf

Links

Submitted to the J. High Energy Phys. arXiv:1202.0704 ; CDS

Topic attachments
I Attachment History Action Size Date Who Comment
PDFpdf Expected_HF_Jet_crossection_CaloJet_data_fNLO_AKt05.pdf r1 manage 15.5 K 2012-02-23 - 17:35 IlknurHos Fig5a
PNGpng Expected_HF_Jet_crossection_CaloJet_data_fNLO_AKt05.png r1 manage 115.9 K 2012-02-23 - 17:54 IlknurHos Fig5a
PDFpdf Expected_HF_Jet_pT_crossection_CaloJet_AKt05_for_3dot14_invpb.pdf r1 manage 14.6 K 2012-02-23 - 17:27 IlknurHos Fig1a
PNGpng Expected_HF_Jet_pT_crossection_CaloJet_AKt05_for_3dot14_invpb.png r1 manage 107.2 K 2012-02-23 - 17:47 IlknurHos Fig1a
PDFpdf Plot_Correction_Factors_For_Herwig_and_Pythia_Calo.pdf r1 manage 14.0 K 2012-02-23 - 17:30 IlknurHos Fig2a
PNGpng Plot_Correction_Factors_For_Herwig_and_Pythia_Calo.png r1 manage 99.8 K 2012-02-23 - 17:49 IlknurHos Fig2a
PDFpdf Table.pdf r1 manage 64.8 K 2012-02-24 - 07:56 DenizSunarCerci Table 1
PNGpng Table.png r1 manage 88.2 K 2012-02-24 - 07:56 DenizSunarCerci Table 1
PDFpdf cTotalExpUncert.pdf r1 manage 13.8 K 2012-02-23 - 17:32 IlknurHos Fig3a
PNGpng cTotalExpUncert.png r1 manage 123.8 K 2012-02-23 - 17:51 IlknurHos Fig3a
PDFpdf cTotalTheoryUncert.pdf r1 manage 13.8 K 2012-02-23 - 17:34 IlknurHos Fig4a
PNGpng cTotalTheoryUncert.png r1 manage 114.6 K 2012-02-23 - 17:53 IlknurHos Fig4a
PDFpdf cTotalTheorywithHerapdfUncert.pdf r1 manage 13.8 K 2012-02-23 - 17:34 IlknurHos Fig4b
PNGpng cTotalTheorywithHerapdfUncert.png r1 manage 116.0 K 2012-02-23 - 17:53 IlknurHos Fig4b
PDFpdf c_dsigma_dpT_HF_and_JES_uncert_with_Lines.pdf r1 manage 15.1 K 2012-02-23 - 17:35 IlknurHos Fig5b
PNGpng c_dsigma_dpT_HF_and_JES_uncert_with_Lines.png r1 manage 121.2 K 2012-02-23 - 17:54 IlknurHos Fig5b
PDFpdf central_XS_herwig.pdf r1 manage 14.7 K 2012-02-23 - 17:38 IlknurHos Fig7d
PNGpng central_XS_herwig.png r1 manage 105.3 K 2012-02-23 - 17:57 IlknurHos Fig7d
PDFpdf central_XS_pythia.pdf r1 manage 14.8 K 2012-02-23 - 17:37 IlknurHos Fig7b
PNGpng central_XS_pythia.png r1 manage 113.2 K 2012-02-23 - 17:56 IlknurHos Fig7b
PDFpdf central_all_pt.pdf r1 manage 14.6 K 2012-02-23 - 17:30 IlknurHos Fig1c
PNGpng central_all_pt.png r1 manage 124.2 K 2012-02-23 - 17:49 IlknurHos Fig1c
PDFpdf central_factor.pdf r1 manage 13.7 K 2012-02-23 - 17:31 IlknurHos Fig2c
PNGpng central_factor.png r1 manage 94.1 K 2012-02-23 - 17:50 IlknurHos Fig2c
PDFpdf central_ratio_XS_herwig.pdf r1 manage 14.1 K 2012-02-23 - 17:40 IlknurHos Fig8d
PNGpng central_ratio_XS_herwig.png r1 manage 105.2 K 2012-02-23 - 17:58 IlknurHos Fig8d
PDFpdf central_ratio_XS_pythia.pdf r1 manage 14.2 K 2012-02-23 - 17:39 IlknurHos Fig8b
PNGpng central_ratio_XS_pythia.png r1 manage 114.4 K 2012-02-23 - 17:58 IlknurHos Fig8b
PDFpdf central_total_systematics.pdf r1 manage 13.8 K 2012-02-23 - 17:33 IlknurHos Fig3c
PNGpng central_total_systematics.png r1 manage 119.1 K 2012-02-23 - 17:52 IlknurHos Fig3c
PDFpdf fnl2222b_pdfcomp1_bin1_fwd-11-002.pdf r1 manage 13.7 K 2012-02-23 - 17:36 IlknurHos Fig6a
PNGpng fnl2222b_pdfcomp1_bin1_fwd-11-002.png r1 manage 86.8 K 2012-02-23 - 17:55 IlknurHos Fig6a
PDFpdf fnl2222b_pdfcomp2_bin1_fwd-11-002.pdf r1 manage 14.2 K 2012-02-23 - 17:36 IlknurHos Fig6b
PNGpng fnl2222b_pdfcomp2_bin1_fwd-11-002.png r1 manage 104.2 K 2012-02-23 - 17:55 IlknurHos Fig6b
PDFpdf fnl2222b_pdfcomp3_bin1_fwd-11-002.pdf r1 manage 12.9 K 2012-02-23 - 17:36 IlknurHos Fig6c
PNGpng fnl2222b_pdfcomp3_bin1_fwd-11-002.png r1 manage 74.3 K 2012-02-23 - 17:55 IlknurHos Fig6c
PDFpdf forward_XS_herwig.pdf r1 manage 14.8 K 2012-02-23 - 17:38 IlknurHos Fig7c
PNGpng forward_XS_herwig.png r1 manage 109.1 K 2012-02-23 - 17:57 IlknurHos Fig7c
PDFpdf forward_XS_pythia.pdf r1 manage 14.9 K 2012-02-23 - 17:37 IlknurHos Fig7a
PNGpng forward_XS_pythia.png r1 manage 115.7 K 2012-02-23 - 17:56 IlknurHos Fig7a
PDFpdf forward_all_pt.pdf r1 manage 14.7 K 2012-02-23 - 17:29 IlknurHos Fig1b
PNGpng forward_all_pt.png r1 manage 128.4 K 2012-02-23 - 17:48 IlknurHos Fig1b
PDFpdf forward_factor.pdf r1 manage 13.8 K 2012-02-23 - 17:31 IlknurHos Fig2b
PNGpng forward_factor.png r1 manage 96.9 K 2012-02-23 - 17:50 IlknurHos Fig2b
PDFpdf forward_ratio_XS_herwig.pdf r1 manage 14.1 K 2012-02-23 - 17:40 IlknurHos Fig8c
PNGpng forward_ratio_XS_herwig.png r1 manage 106.0 K 2012-02-23 - 17:58 IlknurHos Fig8c
PDFpdf forward_ratio_XS_pythia.pdf r1 manage 14.2 K 2012-02-23 - 17:38 IlknurHos Fig8a
PNGpng forward_ratio_XS_pythia.png r1 manage 114.8 K 2012-02-23 - 17:57 IlknurHos Fig8a
PDFpdf forward_total_systematics.pdf r1 manage 13.8 K 2012-02-23 - 17:32 IlknurHos Fig3b
PNGpng forward_total_systematics.png r1 manage 124.1 K 2012-02-23 - 17:51 IlknurHos Fig3b
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