Charmed baryon production at the CERN intersecting storage rings

doi:10.1016/0370-2693(79)91294-2

Physics Letters B

Volume 85, Issue 4, 27 August 1979, Pages 452-457

https://doi.org/10.1016/0370-2693(79)91294-2 Get rights and content

Abstract

The production of a Λ⁺_c charmed baryon has been observed in pp collisions at the CERN ISR. A sharp peak at 2.26 GeV/c² was found in the decay mode Λ⁺_c → $K^{∗0}$ p in events triggered with a forward K⁻ meson. Also the decay mode Λ⁺_c → K⁻ Δ⁺⁺ seems to be present. The estimation of the total cross section for Λ⁺_c production is given. However, the resulting value depends on the assumed form of the differential cross section. In addition, Λ⁺_c production in events triggered by the presence of a direct electron is discussed.

References (7)

H. Frehse
Nucl. Instrum. Methods
(1978)
D. Drijard
Phys. Lett.
(1979)
Cazzoli
Phys. Rev. Lett.
(1975)

There are more references available in the full text version of this article.

Cited by (70)

Novel heavy-quark physics phenomena
2020, Progress in Particle and Nuclear Physics
We review the current understanding of heavy quark parton distributions in nucleons and their impact on deep inelastic scattering, collider physics, and other processes at high energies. The determination of the heavy-quark parton distribution functions is particularly significant for the analysis of hard processes at LHC energies, including the forward rapidity high $x_{F}$ domain. The contribution of “intrinsic” heavy quarks, which are multiply connected to the valence quarks of nucleons, is reviewed within non-perturbative physics which provides new information on the fundamental structure of hadrons in QCD. A new prediction for the non-perturbative intrinsic charm–anticharm asymmetry of the proton eigenstate has recently been obtained from a QCD lattice gauge theory calculation of the proton’s $G_{E}^{p} (Q^{2})$ form factor (Sufian et al., 2020). This form factor only arises from non-valence quarks and anti-quarks if they have different contributions in the proton’s eigenstate. This result, together with the exclusive and inclusive connection and analytic constraints on the form of hadronic structure functions from Light-Front Holographic QCD (LFHQCD) predicts a significant non-perturbative $c (x, Q) - \bar{c} (x, Q)$ asymmetry in the proton structure function at high $x$ , consistent with the dynamics predicted by intrinsic charm models. Recent ATLAS data on the associated production of prompt photons and charm-quark jets in $p p$ collisions at $\sqrt{s} = 8 TeV$ has provided new constraints on non-perturbative intrinsic charm and tests of the LGTH predictions. We also focus on other experimental observables which have high sensitivity to the intrinsic heavy contributions to PDFs.
The physics of heavy quark distributions in hadrons: Collider tests
2017, Progress in Particle and Nuclear Physics
We present a review of the current understanding of the heavy quark distributions in the nucleon and their impact on collider physics. The origin of strange, charm and bottom quark pairs at high light-front (LF) momentum fractions in hadron wavefunction—the “intrinsic” quarks, is reviewed. The determination of heavy-quark parton distribution functions (PDFs) is particularly significant for the analysis of hard processes at LHC energies. We show that a careful study of the inclusive production of open charm and the production of $γ / Z / W$ particles, accompanied by the heavy jets at large transverse momenta can give essential information on the intrinsic heavy quark (IQ) distributions. We also focus on the theoretical predictions concerning other observables which are very sensitive to the intrinsic charm contribution to PDFs including Higgs production at high $x_{F}$ and novel fixed target measurements which can be tested at the LHC.
Physics at the CERN Intersecting Storage Rings (ISR) 1978-1983
2004, Physics Reports
Search for diffractive charm production in 800 GeV/c proton-silicon interactions
1993, Physics Letters B
A search for charm production in the coherent diffractive dissociation reaction pSi→XSi was carried out for the modes D⁰→K⁻π⁺, D⁰→K⁻π⁺π⁺π⁻, and D⁺→K⁻π⁺π⁺. No charm signals were observed, and the 90% confidence level upper limit for coherent charm pair production was determined to be 26 μb per silicon nucleus. The results are interpreted as an upper limit of 0.2% on the amount of intrinsic charm in the proton.
The one particle inclusive differential cross section for heavy quark production in hadronic collisions
1989, Nuclear Physics, Section B
We present formulae and results on the one-particle inclusive differential cross section for heavy quark production in hadronic collisions, including the O(α_S³) radiative corrections. We discuss the general range of applicability of the results and present transverse momentum and rapidity distributions. We consider the production of top, bottom and charm quarks at energies of interest for current experiments.
Heavy quark production
1989, Nuclear Physics B (Proceedings Supplements)

View all citing articles on Scopus

¹: Now at DESY, Hamburg, Germany.

²: Now at SLAC, Stanford, USA.

³: Now at CERN, Geneva, Switzerland.

View full text

Charmed baryon production at the CERN intersecting storage rings

Abstract

Nucl. Instrum. Methods

Phys. Lett.

Phys. Rev. Lett.