Measurement of the inclusive ϕ cross-section in pp collisions at √s = 7 TeV

The preprint is available here.

Phys. Lett. B 703 (2011) 267-273

arXiv:1107.3935

More detailed information: ANA note 2011-034

Abstract

The cross-section for inclusive phi meson production in pp collisions at a centre-of-mass energy of sqrt(s) = 7 TeV has been measured with the LHCb detector at the Large Hadron Collider. The differential cross-section is measured as a function of the phi transverse momentum p_T and rapidity y in the region 0.6 < p_T < 5.0 GeV/c and 2.44 < y < 4.06. The cross-section for inclusive phi production in this kinematic range is sigma(pp -> phi X) = 1758 pm 19(stat) ^{+43}_{-14}(syst) pm 182(scale) microbarn, where the first systematic uncertainty depends on the p_T and y region and the second is related to the overall scale. Predictions based on the Pythia 6.4 generator underestimate the cross-section.

Figures

(Note, eps versions are available under attachments).

Caption Figure
Fit to the tag sample in the bin 0.6 < pT < 0.8 GeV/c, 3.34 < y < 3.52 for one of the two magnet polarities. Shown are the data points, the fit result (thick solid line) as well as the signal (thin solid line) and the background component (dash-dotted line). Fig1a.png
Fit to the probe sample in the bin 0.6 < pT < 0.8 GeV/c, 3.34 < y < 3.52 for one of the two magnet polarities. Shown are the data points, the fit result (thick solid line) as well as the signal (thin solid line) and the background component (dash-dotted line). Fig1b.png
Inclusive differential φ production cross-section as a function of pT, measured with data (points), and compared to the LHCb default MC tuning (solid line) and Perugia 0 tuning (dashed line). The error bars represent the statistical uncertainty, the braces show the bin dependent systematic errors, the overall scale uncertainty from Table 1 is not plotted. The lower parts of the plots show the ratio data cross-section over Monte Carlo cross-section. Error bars in the ratio plots show statistical uncertainties only. Fig2a.png
Inclusive differential φ production cross-section as a function of y, measured with data (points), and compared to the LHCb default MC tuning (solid line) and Perugia 0 tuning (dashed line). The error bars represent the statistical uncertainty, the braces show the bin dependent systematic errors, the overall scale uncertainty from Table 1 is not plotted. The lower parts of the plots show the ratio data cross-section over Monte Carlo cross-section. Error bars in the ratio plots show statistical uncertainties only. Fig2b.png

-- TaraShears - 18-Sep-2012

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PNGpng Fig1a.png r1 manage 110.8 K 2012-09-18 - 15:37 TaraShears  
Unknown file formateps Fig1a1.eps r1 manage 24.5 K 2012-09-18 - 15:37 TaraShears  
PNGpng Fig1b.png r1 manage 115.6 K 2012-09-18 - 15:37 TaraShears  
Unknown file formateps Fig1b1.eps r1 manage 25.4 K 2012-09-18 - 15:37 TaraShears  
PNGpng Fig2a.png r1 manage 60.0 K 2012-09-18 - 15:37 TaraShears  
Unknown file formateps Fig2a1.eps r1 manage 20.8 K 2012-09-18 - 15:37 TaraShears  
PNGpng Fig2b.png r1 manage 61.9 K 2012-09-18 - 15:37 TaraShears  
Unknown file formateps Fig2b1.eps r1 manage 19.3 K 2012-09-18 - 15:37 TaraShears  
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