Measurement of the -meson production cross section at low transverse momentum in collisions at
We report on a measurement of the D+-meson production cross section as a function of transverse momentum (pT) in proton-antiproton (p$$\bar{p}$$) 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 p$$\bar{p}$$ collisions. Inelastic p$$\bar{p}$$ 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+,1.5T<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 p$$\bar{p}$$ collisions and can improve the shape and uncertainties of future predictions.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Illinois at Urbana-Champaign, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- CDF Collaboration
- Grant/Contract Number:
- AC02-07CH11359; SC0015640
- OSTI ID:
- 1343971
- Alternate ID(s):
- OSTI ID: 1360877; OSTI ID: 1594610
- Report Number(s):
- FERMILAB-PUB-16-473-PPD; arXiv:1610.08989; PRVDAQ; 1495024
- Journal Information:
- Physical Review D, Vol. 95, Issue 9; ISSN 2470-0010
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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Related Subjects
anti-p p: inelastic scattering | D+: hadroproduction | D+: hadronic decay | transverse momentum dependence | transverse momentum: low | cross section: measured | quantum chromodynamics | Batavia TEVATRON Coll | total cross section: measured | direct production | impact parameter | hard scattering | mass spectrum: (K- 2pi+) | transverse momentum: momentum spectrum | anti-p p: colliding beams | off-line | rapidity | on-line | CDF | experimental results | D+ -> K- 2pi+ | 1960 GeV-cms