Measurement of the <i>D</i><SUP>+</SUP>-meson production cross section at low transverse momentum in <i>p(p)over-bar</i> collisions at √<i>s</i>=1.96 TeV

Aaltonen, T, Amerio, S, Amidei, D, Anastassov, A, Annovi, A, Antos, J, Apollinari, G, Appel, JA, Arisawa, T, Artikov, A
et al (show 386 more authors) (2017) Measurement of the <i>D</i><SUP>+</SUP>-meson production cross section at low transverse momentum in <i>p(p)over-bar</i> collisions at √<i>s</i>=1.96 TeV. PHYSICAL REVIEW D, 95 (9). 092006-.

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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.

Item Type: Article
Uncontrolled Keywords: 5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 51 Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 03 Jul 2017 07:13
Last Modified: 21 Jun 2024 17:58
DOI: 10.1103/PhysRevD.95.092006
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