D±production asymmetry at the LHC from heavy quark recombination

Abstract

The asymmetries in the forward region production cross section of Λ + c /Λ − c and Λ 0 b /Λ 0 b are predicted using the heavy quark recombination mechanism for pp collisions at 7 TeV and 14 TeV.Using non-perturbative parameters determined from various previous experiments, we find thatthe forward region covered by the LHCb experiment.

Λc+/Λc−andLai1, Leibovich2 2015Phys. Rev. DSelf Cite

“…In this paper, we make predictions for the rapidity and transverse momentum distributions of the asymmetries of heavy baryon productions using the heavy quark recombination mechanism [10][11][12][13] A similar asymmetry can be seen in the meson system. The asymmetry in D ± production has been observed in the forward region at LHCb [14], and can be explained using the heavy quark recombination mechanism [15]. The heavy quark recombination mechanism also successfully explained production asymmetries of D ± and Λ ± c in fixed-target experiments [11][12][13]16].…”

“…As a result, in principle our calculations should have large theoretical uncertainties for p T ∼ m Q . However, as shown in [15], the heavy quark recombination works reasonably well at regions of p T as low as p T ∼ 2 GeV in explaining the D ± asymmetries at LHCb. Therefore, it seems reasonable to include the p T ∼ m Q region in our calculations.…”

“…where q = u, d, s and q = u, d. From [15], a reasonable fit to D ± asymmetry at LHCb gives 0.055 < ρ 1 < 0.065, 0.65 < ρ 8 < 0.8, 0.24 <ρ 1 < 0.3 and 0.24…”

Forward charm-production models and prompt neutrinos at IceCube

“…They also fitted photoproduction data, which leads to ρ 1 ≈ 0.15. More recently, these expressions have been used [26] to reproduce the D asymmetry observed at LHCb. There it was found, at somewhat lower values of x F , that coulour-singlet spin-non-flip terms were not enough to reproduce the asymmetry.…”

Production asymmetry of open charm mesons within unfavoured ragmentation scenario

“…[3]. The LHCb asymmetry was discussed also in the framework of heavy-quark recombination approach [4]. Here there are four unknown parameters responsible for formation of D mesons.…”