Study of forward Z+jet production in pp collisions at √s= 7 TeV

The paper is available here.

JHEP 1401 (2014) 033

arXiv: 1310.8197

More detailed information: ANA note 2013-056

Abstract

A measurement of the Z(→ μ+μ−) + jet production cross-section in pp collisions at a centre-of-mass energy √s = 7 TeV is presented. The analysis is based on an integrated luminosity of 1.0 fb-1 recorded by the LHCb experiment. Results are shown with two jet transverse momentum thresholds, 10 and 20 GeV, for both the overall cross-section within the fiducial volume, and for six differential cross-section measurements. The fiducial volume requires that both the jet and the muons from the Z boson decay are produced in the forward direction (2.0 < η < 4.5). The results show good agreement with theoretical predictions at the second-order expansion in the coupling of the strong interaction.

Additional plots: Supporting material

Figures

(Note, pdf and eps versions are available under attachments).

Caption Figure
Figure.1 Jet identification efficiency as a function of the true jet pTjet . The uncertainties shown are statistical. The zero on the vertical axis is suppressed. Fig1.png
Figure.2: Comparison between data (black points) and simulation (red line) in the jet Z pTjet /pTZdistribution for selected Z+1-jet events where the Z boson and the jet are emitted azimuthally opposed. The uncertainties shown are statistical. Fig2.png
Figure 3: Ratio of the Z+jet cross-section to the inclusive cross-section, for (top) pT jet> 20 GeV jet and (bottom) pTjet > 10 GeV. The bands show the LHCb measurement (with the inner band showing the statistical uncertainty and the outer band showing the total uncertainty). The points correspond to different theoretical predictions with the error bars indicating their uncertainties as described in the main text. These results are corrected for FSR from the final state muons from the Z boson decay. Fig3top.pngFig3bottom.png
Figure 4: Cross-section for Z+jet production, differential in the leading jet pT, for pTjet > 10 GeV. The bands show the LHCb measurement (with the inner band showing the statistical uncertainty and the outer band showing the total uncertainty). The points correspond to different theoretical predictions with the error bars indicating their uncertainties as described in the main text. Predictions are displaced horizontally for presentation. These results are not corrected for FSR from the final state muons from the Z boson decay. Fig4.png
Figure 5: Cross-section for Z+jet production, differential in the leading jet pseudorapidity, for (left) pT jet> 20 GeV and (right) pT jet> 10 GeV. The bands show the LHCb measurement (with the inner band showing the statistical uncertainty and the outer band showing the total uncertainty). Superimposed are predictions as described in Fig. 4. Fig5l.pngFig5r.png
Figure 6: Cross-section for Z+jet production, differential in the Z boson rapidity, y Z, for (left) pT jet > 20 GeV and (right) pT jet> 10 GeV. The bands show the LHCb measurement (with the inner band showing the statistical uncertainty and the outer band showing the total uncertainty).Superimposed are predictions as described in Fig. 4. Fig6l.pngFig6r.png
Figure 7: Cross-section for Z+jet production, differential in the Z boson transverse momentum, for (left) p T jet> 20 GeV and (right) pT jet > 10 GeV. The bands show the LHCb measurement (with the inner band showing the statistical uncertainty and the outer band showing the total uncertainty). Superimposed are predictions as described in Fig. 4. Fig7l.png Fig7r.png
Figure 8: Cross-section for Z+jet production, differential in the difference in φ between the Z boson and the leading jet, for (left) pT jet > 20 GeV and (right) p T jet > 10 GeV. The bands show the LHCb measurement (with the inner band showing the statistical uncertainty and the outer band showing the total uncertainty). Superimposed are predictions as described in Fig. 4. Fig8l.png Fig8r.png
Figure 9: Cross-section for Z+jet production, differential in the difference in rapidity between he Z boson and the leading jet, for (left) pT jet > 20 GeV and (right) pT jet > 10 GeV. The bands show the LHCb measurement (with the inner band showing the statistical uncertainty and the outer band showing the total uncertainty). Superimposed are predictions as described in Fig. 4. Fig9l.png Fig9r.png

-- KatharinaMueller - 09 Jan 2014

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PDFpdf Fig1.pdf r1 manage 14.2 K 2014-01-09 - 10:36 KatharinaMueller  
PNGpng Fig1.png r1 manage 11.9 K 2014-01-09 - 10:36 KatharinaMueller  
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PDFpdf Fig2.pdf r1 manage 17.3 K 2014-01-09 - 10:36 KatharinaMueller  
PNGpng Fig2.png r1 manage 18.9 K 2014-01-09 - 10:36 KatharinaMueller  
Unknown file formateps Fig3bottom.eps r1 manage 51.9 K 2014-01-09 - 10:36 KatharinaMueller  
PDFpdf Fig3bottom.pdf r1 manage 14.1 K 2014-01-09 - 10:36 KatharinaMueller  
PNGpng Fig3bottom.png r1 manage 18.2 K 2014-01-09 - 10:36 KatharinaMueller  
Unknown file formateps Fig3top.eps r1 manage 49.5 K 2014-01-09 - 10:36 KatharinaMueller  
PDFpdf Fig3top.pdf r1 manage 14.1 K 2014-01-09 - 10:37 KatharinaMueller  
PNGpng Fig3top.png r1 manage 18.1 K 2014-01-09 - 10:37 KatharinaMueller  
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PNGpng Fig4.png r1 manage 34.9 K 2014-01-09 - 10:37 KatharinaMueller  
Unknown file formateps Fig5l.eps r1 manage 82.3 K 2014-01-09 - 10:37 KatharinaMueller  
PDFpdf Fig5l.pdf r1 manage 15.5 K 2014-01-09 - 10:37 KatharinaMueller  
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Unknown file formateps Fig5r.eps r1 manage 82.2 K 2014-01-09 - 10:38 KatharinaMueller  
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PNGpng Fig5r.png r1 manage 24.2 K 2014-01-09 - 10:38 KatharinaMueller  
Unknown file formateps Fig6l.eps r1 manage 82.5 K 2014-01-09 - 10:38 KatharinaMueller  
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PNGpng Fig6r.png r1 manage 23.6 K 2014-01-09 - 10:39 KatharinaMueller  
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