Doubly heavy baryon production at a high luminositye+e−collider

bcdiquark pair production in high energy proton-proton collisions

“…(20) are given in Table I. There is no such model available for sextuplet diquarks, so all their nonperturbative parameters, including R(0), are simply taken equal to the ones of triplet diquarks, what is the common practice allowing to roughly estimate the order of contributions from these color states [5,[22][23][24][25][26][27][28]. The relativistic parameters ω nk from Table I are almost indistinguishable for scalar and axial-vector (bc) diquarks, and this fact was used to slightly simplify the final view of the cross section (19).…”

“…Both octet and sextuplet cases require an additional gluon to be emitted in the nonperturbative part of the process, what generally O(v 2 ) suppresses the appropriate matrix elements, if the required emission is attributed to the heavy quark of relative velocity v. Nevertheless, in the case of double heavy baryon the final state also contains a light quark, which produces gluon easily, so that the different power counting rules can be applied, and both antitriplet and sextuplet matrix elements turn out to be of the same order [22]. Under this assumption, the sextuplet mechanism was shown to be equally or even more important than conventional antitriplet channel for various high energy processes of double heavy baryon production [22][23][24][25][26][27][28].…”

Production of doubly heavy baryons via Higgs boson decays

“…After the action of the charge parity C = −iγ 2 γ 5 , the hard amplitude M[n] for the production of the intermediate diquark state can be related to the familiar meson production, which has been proved in Refs. [20,21] in detail. In other words, we could obtain the hard amplitude M[n] of the process…”

“…To study all possible production mechanisms of doubly heavy baryons shall be helpful for better understanding their properties and shall be a verification of the quark model and nonrelativistic Quantum Chromodynamics (NRQCD) [16,17]. There were some analyses of the direct/indirect production of doubly heavy baryons through e + e − colliders [18][19][20][21], hadronic production [19,[22][23][24][25][26][27][28][29][30][31], gamma-gamma production [24,32], photoproduction [24,33,34], heavy ion collisions [35,36], top quark decays [37], etc.…”

Production of doubly heavy-flavored hadrons ate+e−colliders

“…[24,25]. We reverse one of the fermion lines of the heavy quark through charge conjugate transformation firstly, and then similarly to writing down the amplitude of doubly heavy meson production showed above, we directly write down the requested amplitude for the binding diquark production.…”