Aaltonen, T;
Amerio, S;
Amidei, D;
Anastassov, A;
Annovi, A;
Antos, J;
Apollinari, G;
... Zucchelli, S; + view all
(2017)
Measurement of the D+-meson production cross section at low transverse momentum in p(p)over-bar collisions at root s=1.96 TeV.
Physical Review D
, 95
(9)
, Article 092006. 10.1103/PhysRevD.95.092006.
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Abstract
We report on a measurement of the D+-meson production cross section as a function of transverse momentum (pT) in proton-antiproton (pp) collisions at 1.96 TeV center-of-mass energy, using the full data set collected by the Collider Detector at Fermilab in Tevatron Run II and corresponding to 10 fb−1 of integrated luminosity. We use D+→K−π+π+decays fully reconstructed in the central rapidity region |y|<1 with transverse momentum down to 1.5 GeV/c, a range previously unexplored in pp collisions. Inelastic pp-scattering events are selected online using minimally biasing requirements followed by an optimized offline selection. The K−π+π+ mass distribution is used to identify the D+ signal, and the D+ transverse impact-parameter distribution is used to separate prompt production, occurring directly in the hard-scattering process, from secondary production from b -hadron decays. We obtain a prompt D + signal of 2950 candidates corresponding to a total cross section σ (D+,1.5 < pT < 14.5 GeV/c,|y|<1)=71.9 ± 6.8 (stat) ± 9.3 (syst) μb . While the measured cross sections are consistent with theoretical estimates in each pT bin, the shape of the observed pT spectrum is softer than the expectation from quantum chromodynamics. The results are unique in pp collisions and can improve the shape and uncertainties of future predictions
| Type: | Article |
|---|---|
| Title: | Measurement of the D+-meson production cross section at low transverse momentum in p(p)over-bar collisions at root s=1.96 TeV |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevD.95.092006 |
| Publisher version: | http://dx.doi.org/10.1103/PhysRevD.95.092006 |
| Language: | English |
| Additional information: | © 2017 American Physical Society |
| Keywords: | Science & Technology, Physical Sciences, Astronomy & Astrophysics, Physics, Particles & Fields, Physics, Heavy Quark Production |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/1528512 |
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