Production of twocc¯pairs in double-parton scattering

Abstract

We discuss production of two pairs of cc within a simple formalism of double-parton scattering (DPS). Surprisingly very large cross sections, comparable to single-parton scattering (SPS) contribution, are predicted for LHC energies. Both total inclusive cross section as a function of energy and differential distributions for √ s are shown. We discuss a perspective how to identify the double scattering contribution.

Observation of double charm production involving open charm in pp collisions at $ \sqrt {s} = {7}\;{\text{TeV}} $

“…[14,15,18] are significantly smaller than the observed cross-sections. Better agreement is found with the DPS model [4][5][6][7] if the effective crosssection inferred from the Tevatron data is used. The absence of significant azimuthal or rapidity correlations provides support for this hypothesis.…”

“…The DPS contribution can be estimated, neglecting partonic correlations in the proton, as the product of the cross-sections of the sub-processes involved divided by an effective cross-section [4][5][6][7] σ DPS (C 1 C 2 ) =…”

“…The sources of systematic uncertainty on the J/ψ C production cross-section measurements are summarized in table 7 and those for open charm in tables 8 and 9. The total systematic uncertainties have been evaluated taking correlations into account where appropriate.…”

“…Recently, studies of double charmonium and charmonium with associated open charm production have been proposed as probes of the quarkonium production mechanism [3]. In pp collisions, additional contributions from other mechanisms, such as Double Parton Scattering (DPS) [4][5][6][7] or the intrinsic charm content of the proton [8] to the total cross-section, are possible, though these constributions may not be mutually exclusive.…”

W + W − pair production in proton-proton collisions: small missing terms

“…[47,48]). For example in our case of W + W − production the cross section differential in W boson rapidities can be written as: 25) where y + and y − are rapidites of W + and W − , respectively.…”