Measurement of inclusive differential cross sections for Upsilon(1S) production in p-pbar collisions at sqrt(s) = 1.96 TeV

Abstract

We present measurements of the inclusive production cross sections of the Upsilon(1S) bottomonium state in ppbar collisions at sqrt(s) = 1.96 TeV. Using the Upsilon(1S) to mu+mu- decay mode for a data sample of 159 +- 10 pb^-1 collected by the D0 detector at the Fermilab Tevatron collider, we determine the differential cross sections as a function of the Upsilon(1S) transverse momentum for three ranges of the Upsilon(1S) rapidity: 0 < |y| < 0.6, 0.6 < |y| < 1.2, and 1.2 < |y| < 1.8.

Figures (4)

• Figure 1: Example of fits to the dimuon spectra in different bins of rapidity in the $p_T$ bin of 4 GeV/$c$$< p_T^{\Upsilon} <$ 6 GeV/$c$: (a) $|y^{\Upsilon}| \leq$ 0.6, (b) $1.2 < |y^{\Upsilon}| \leq 1.8$. The heavy line shows the combined fit for signal and background. Also shown are the individual contributions from the three $\Upsilon$ states and the background separately.
• Figure 2: Normalized differential cross sections for $\Upsilon (1S)$ production compared with theory predictions theory:Bergerbergerd0. The errors shown correspond to the errors in Table \ref{['table:cross-differ']}.
• Figure 3: The ratio of differential cross sections (squares) for $\sigma$($1.2 < |y^{\Upsilon}| \leq 1.8$) to $\sigma$($|y^{\Upsilon}| \leq 0.6$). The solid line is the Monte Carlo prediction pythia normalized to the measured ratio of the $p_T$-integrated cross section. Uncertainties of the relative normalization are indicated by the dashed lines.
• Figure 4: Normalized differential cross sections for $\Upsilon (1S)$ production at $\sqrt{s} = 1.96$ TeV compared with published CDF results CDF:ups3 at $\sqrt{s} = 1.8$ TeV. The errors shown are statistical only.