Photoproduction of doubly heavy baryon at the ILC

الأصل · EN

In the present paper, we make a detailed study on the doubly heavy baryon photoproduction in the future e+e- International Linear Collider (ILC). The baryons Ξcc, Ξbc, and Ξbb are produced via the channel γγ→ ΞQQ' +Q' +Q, where Q and Q' stand for heavy c or b quark, respectively. As for the ΞQQ'-baryon production, it shall first generate a (QQ')[n]-diquark and then form the final baryon via fragmentation, where [n] stands for the color- and spin- configurations for the (QQ')-diquark states. According to the non-relativistic QCD theory, four diquark configurations shall provide sizable contributions to the baryon production, e.g., [n] equals [³S₁]3, [¹S₀]₆, [³S₁]₆, or [¹S₀]3, respectively. We adopt the improved helicity amplitude approach for the hard scattering amplitude to improve the calculation efficiency. Total and differential cross sections of those channels, as well as the theoretical uncertainties, are presented. We show that sizable amounts of baryon events can be generated at the ILC, i.e., about 2.0× 10⁶ Ξcc, 2.2× 10⁵ Ξbc, as well as 3.0× 10³Ξbb events are to be generated in one operation year for √S=500 GeV and L≃ 10³⁶cm⁻²s⁻¹.