S-Space College of Natural Sciences (자연과학대학) Dept. of Physics and Astronomy (물리·천문학부) Physics (물리학전공) Journal Papers (저널논문_물리학전공)
Measurement of the D+-meson production cross section at low transverse momentum in p(p)over-bar collisions at root s=1.96 TeV
- Issue Date
- AMER PHYSICAL SOC
- PHYSICAL REVIEW D Vol.95 No.9, pp. 1-MAX
- Measurement of the D+-meson production cross section at low transverse momentum in p(p)over-bar collisions at root s=1.96 TeV; 자연과학
- We report on a measurement of the D+ -meson production cross section as a function of transverse momentum (p(T)) in proton-antiproton (p (p) over bar) 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-broken vertical bar -> K- pi(broken vertical bar) pi(broken vertical bar) decays fully reconstructed in the central rapidity region broken vertical bar y broken vertical bar < 1 with transverse momentum down to 1.5 GeV/c, a range previously unexplored in p<(p)over bar> collisions. Inelastic p (p) over bar -scattering events are selected online using minimally biasing requirements followed by an optimized offline selection. The K- pi(+) pi(+) 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 sigma(D+), 1.5 < P-T < 14.5 GeV/c, vertical bar y vertical bar < 1) = 71.9 +/- 6.8 (stat) +/- 9.3 (syst) mu b.While the measured cross sections are consistent with theoretical estimates in each p(T) bin, the shape of the observed p(T) spectrum is softer than the expectation from quantum chromodynamics. The results are unique in p<(p)over bar> collisions and can improve the shape and uncertainties of future predictions.