Inclusive J/ψ and ψ′ production in π−-nucleus interactions at √s ⋍ 26 GeV
TL;DR: In this article, the results of charmonium production were compared with results on open-charm production, relating to the same experimental conditions, and the ratio between the J / ψ cross-section and the charmed-meson crosssection was found to be σ 0 (J/ψ)/σ 0 (D D − ) = 1.13 ± 0.01.
About: This article is published in Nuclear Physics.The article was published on 1999-09-20 and is currently open access. It has received 11 citations till now. The article focuses on the topics: Quarkonium.
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TL;DR: In this article, an unorthodox way to describe the production of rapidity gaps in deep inelastic scattering, recently proposed by Buchmueller and Hebecker, suggests a description of heavy quark bound states which is in agreement with data.
Abstract: We point out that an unorthodox way to describe the production of rapidity gaps in deep inelastic scattering, recently proposed by Buchm\"uller and Hebecker, suggests a description of the production of heavy quark bound states which is in agreement with data. The approach questions the conventional treatment of the color quantum number in perturbative QCD.
49 citations
TL;DR: The fundamental theory of the strong interaction, quantum chromodynamics (QCD), provides the foundational framework with which to describe and understand the key properties of atomic nuclei as discussed by the authors, but a deep understanding of the explicit role of quarks and gluons in nuclei remains elusive.
Abstract: The fundamental theory of the strong interaction -- quantum chromodynamics (QCD) -- provides the foundational framework with which to describe and understand the key properties of atomic nuclei. A deep understanding of the explicit role of quarks and gluons in nuclei remains elusive however, as these effects have thus far been well-disguised by confinement effects in QCD which are encapsulated by a successful description in terms of effective hadronic degrees of freedom. The observation of the EMC effect has provided an enduring indication for explicit QCD effects in nuclei, and points to the medium modification of the bound protons and neutrons in the nuclear medium. Understanding the EMC effect is a major challenge for modern nuclear physics, and several key questions remain, such as understanding its flavor, spin, and momentum dependence. This manuscript provides a contemporary snapshot of our understanding of the role of QCD in nuclei and outlines possible pathways in experiment and theory that will help deepen our understanding of nuclei in the context of QCD.
32 citations
TL;DR: The fundamental theory of the strong interaction-quantum chromodynamics (QCD) provides the foundational framework with which to describe and understand the key properties of atomic nuclei as mentioned in this paper.
Abstract: The fundamental theory of the strong interaction-quantum chromodynamics (QCD)—provides the foundational framework with which to describe and understand the key properties of atomic nuclei. A deep understanding of the explicit role of quarks and gluons in nuclei remains elusive however, as these effects have thus far been well-disguised by confinement effects in QCD which are encapsulated by a successful description in terms of effective hadronic degrees of freedom. The observation of the EMC effect has provided an enduring indication for explicit QCD effects in nuclei, and points to the medium modification of the bound protons and neutrons in the nuclear medium. Understanding the EMC effect is a major challenge for modern nuclear physics, and several key questions remain, such as understanding its flavor, spin, and momentum dependence. This manuscript provides a contemporary snapshot of our understanding of the role of QCD in nuclei and outlines possible pathways in experiment and theory that will help deepen our understanding of nuclei in the context of QCD.
30 citations
TL;DR: In this paper, the color evaporation model is applied to the pion parton distribution functions and it is shown that the existing pion-induced $J/\ensuremath{\psi}$ production data, usually not included in the global fits, can impose useful additional constraints.
Abstract: The gluon distributions of the pion obtained from various global fits exhibit large variations among them. Within the framework of the color evaporation model, we show that the existing pion-induced $J/\ensuremath{\psi}$ production data, usually not included in the global fits, can impose useful additional constraints on the pion parton distribution functions (PDFs). In particular, these data can probe the pion's gluon densities at large $x$. Existing pion-induced $J/\ensuremath{\psi}$ data covering a broad range of beam momenta are compared with next-to-leading-order QCD calculations using various sets of pion PDFs. It is found that $J/\ensuremath{\psi}$ data measured at forward rapidity and at sufficiently high beam momentum are sensitive to the large-$x$ gluon distribution of pions. The current $J/\ensuremath{\psi}$ data favor the Sutton-Martin-Roberts-Stirling and Gluck-Reya-Vogt pion PDFs, containing significant gluon content at large $x$.
29 citations
01 Jan 1978
TL;DR: In this paper, it was shown that only a combined version of light quark q anti q, c anti c fusion and gluon gg gg, and c anti q fusion mechanisms can account for the various total cross section beam ratios as well as for the observed x/sub F/-distributions.
Abstract: Using the recent CERN and Fermilab measurements for J/psi production by ..pi../sup + -/, K/sup + -/, p and anti p beams it is shown, within the framework of QCD, that only a combined version of light quark q anti q ..-->.. c anti c fusion and gluon gg ..-->.. c anti c fusion mechanisms can account for the various total cross section beam ratios as well as for the observed x/sub F/-distributions. 10 references.
12 citations
References
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TL;DR: In this article, the authors present a study of the inclusive production of K¯¯¯¯*(892) and ∑t+-(1385)+cc at 3.6 GeV/c from the interactions of K�2*(1385) and K¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯* (1385), and compared with the expectation from Mueller-Regge formalism.
Abstract: We present a study of the inclusive production ofK
*(892) and ∑t+-(1385)+cc at 3.6 GeV/c from
$$\bar p$$
p interactions. The sensitivity of the exposure is 35.4 events/μb. Longitudinal and transverse momentum distributions are presented. The indirect production ofK
0
from parentK
* and that of Λ's from parent Σ(1385) are studied. The shape of thex distribution of Λ's for
$$p\xrightarrow{{\bar p}}\Lambda $$
are calculated from
$$p\xrightarrow{p}\Lambda $$
and
$$p\xrightarrow{{\pi ^ - }}\Lambda $$
and compared with the experimental distributions. The difference of antiparticle production cross-section ofK
0
in the central region is compared with the expectation from Mueller-Regge formalism.
783 citations
TL;DR: In this paper, the one-particle inclusive differential cross section for heavy quark production in hadronic collisions, including the O(αS3) radiative corrections, is presented.
531 citations
TL;DR: A new set of distributions, CteQ3, incorporating several new types of data is reported and compared to the two previous sets of CTEQ distributions, and the remaining uncertainties in the parton distributions are assessed.
Abstract: The CTEQ program for the determination of parton distributions through a global QCD analysis of data for various hard scattering processes is fully described. A new set of distributions, CTEQ3, incorporating several new types of data is reported and compared to the two previous sets of CTEQ distributions. A comparison with current data is discussed in some detail. The remaining uncertainties in the parton distributions and methods to further reduce them are assessed. Comparisons with the results of other global analyses are also presented.
350 citations
TL;DR: In this article, it is suggested that the production of heavy quark flavors in hardronic reactions proceeds via the materialization of a highly virtual gluon into a heavy quarks-antiquark pair.
344 citations
TL;DR: In this article, the authors derived the normalized total cross section for the quantum-chromodynamic subprocess of the inelastic process of the photoproduction at small √ n = 2.
Abstract: Amplitudes are derived for the quantum-chromodynamic subprocess $\ensuremath{\gamma}g\ensuremath{\rightarrow}(\frac{J}{\ensuremath{\psi}})g$, with a specific wave function used to represent the $\frac{J}{\ensuremath{\psi}}$ as a $c\overline{c}$ system. The results are used to obtain the normalized total cross section ${\ensuremath{\sigma}}_{\ensuremath{\gamma}}$ for the inelastic process $\ensuremath{\gamma}N\ensuremath{\rightarrow}(\frac{J}{\ensuremath{\psi}})X$, predictions for the $z$ and ${p}_{T}$ dependence of inelastic $\frac{J}{\ensuremath{\psi}}$ photoproduction, and predictions for the $\frac{J}{\ensuremath{\psi}}$ helicity. The predictions apply as well to electroproduction at small ${Q}^{2}$.
344 citations