Measurement of the D.sup.+./sup. -meson production cross section at low transverse momentum in pp¯ collisions at √s = 1.96 TeV

0487770 - FZÚ 2018 RIV US eng J - Článek v odborném periodiku
Aaltonen, T. - Amerio, S. - Amidei, D. - Lysák, Roman … celkem 396 autorů
Measurement of the D⁺ -meson production cross section at low transverse momentum in pp¯ collisions at √s = 1.96 TeV.
Physical Review D. Roč. 95, č. 9 (2017), s. 1-8, č. článku 092006. ISSN 2470-0010. E-ISSN 2470-0029
Institucionální podpora: RVO:68378271
Klíčová slova: anti-p p * colliding beams * off-line * rapidity * on-line * CDF * experimental results * D+ --> K- 2pi+ * 1960 GeV-cms
Obor OECD: Particles and field physics
Impakt faktor: 4.394, rok: 2017

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

Trvalý link: http://hdl.handle.net/11104/0282403