How much charm can $$\bar P$$ ANDA produce?

Abstract

We consider the production of charmed baryons and mesons in the protonantiproton binary reactions at the energies of the futureP ANDA experiment. To describe these processes in terms of hadronic interaction models, one needs strong couplings of the initial nucleons with the intermediate and final charmed hadrons. Similar couplings enter the models of binary reactions with strange hadrons. For both charmed and strange hadrons we employ the strong couplings and their ratios calculated from QCD light-cone sum rules. In this method finite masses of c and s quarks are taken into account. Employing the Kaidalov's quark-gluon string model with Regge poles and adjusting the normalization of the amplitudes in this model to the calculated strong couplings, we estimate the production cross section of charmed hadrons. For pp → Λ cΛc it can reach several tens of nb at p lab = 15 GeV, whereas the cross sections of Σ c and D pair production are predicted to be smaller.

A Perturbative QCD Approach to $$\varvec{\pi ^{-}~p \rightarrow D^{-}~{\varLambda }_{c}^{+}}$$ π - p → D - Λ c +

“…This is in contrast to the findings forp p →Λ − c Λ + c andp p →D 0 D 0 , where models using simple [16,17] or Reggeized hadron exchange [18,19] find cross sections which are two to three orders of magnitude larger than those from the handbag-type mechanism. The crucial point in these models seems to be the strength of the D ( * ) pY c coupling which is either fixed by SU (4)-flavor symmetry [16][17][18] or by QCD sum rules [19]. In our case this coupling corresponds to the form factors G and S T .…”

Form factors and strong couplings of heavy baryons from QCD light-cone sum rules

“…In particular, the partially integrated width of Λ b → pℓν l can be used for the |V ub | determination from the future data on this decay. Furthermore, in a forthcoming publication [30] we will employ the LCSR results for the strong couplings of charmed baryons to estimate their production in proton-antiproton collisions in the PANDA energy region.…”

“…The couplings (43) play an important role in various models of strong interactions formulated in terms of virtual hadron exchanges, like e.g., in the production of a charmed baryon pair in the pp collision, with a virtual D ( * ) exchange in t-channel. In the forthcoming publication [30] we shall consider this process in the PANDA energy region. It is tempting to formulate the hadronic exchange models in terms of effective Lagrangians involving propagation and couplings of hadronic fields rather than quarks and gluons.…”

Role ofY(4630)in thepp¯→<

“…where the coupling constants of Λ c pD and Λ c pD * interactions are taken as g ΛcpD = 10.7 +5.3 −4.3 and g ΛcpD * = −5.8 +2.1 −2.5 [38,43]. The couplings of Y Λ cΛc and Y pp can be obtained from their partial decay widths.…”

“…In addition, the production of charmed baryon states in the pp collisions has been investigated within many theoretical models, such as the quark-diquark picture, a handbag approach, a quark-gluon string model which based on Regge asymptotics, meson-exchange model, and single-channel effective Lagrangian model [32][33][34][35][36][37][38][39].…”