Konferenzpaper

Jahr der Veröffentlichung: 2003

Seiten: 305-307

Zeitschrift: The European Physical Journal A

Bandnummer: 18

Heftnummer: 2-3

ISSN: 1434-6001

eISSN: 1434-601X

DOI Link: https://doi.org/10.1140/epja/i2002-10222-6

Konferenz: International Conference on Quark Nuclear Physics

Verlag: Springer

Abstract: 
Using the Quark-Gluon Strings Model (QGSM) combined with Regge phenomenology we consider the reactions pi(-)p --> K(0)Lambda and pi(-)p --> D(-)Lambda(c)(+) which are dominated by the contributions of the K-* and D-* Regge trajectories, respectively. The spin structure of the amplitudes is described by introducing Reggeized Born terms. It is found that the existing data for the reaction pi(-)p --> K(0)Lambda are in reasonable agreement with the model predictions. To describe the absolute values of the cross-sections it is necessary to introduce also suppression factors which can be related to absorption corrections. Furthermore, assuming the SU(4) symmetry to hold for Regge residues and the universality of absorption corrections we calculate the cross-section of the reaction pi(-)p --> D(-)Lambda(c)(+). Employing the latter results from pi(-)p reactions we then estimate the contributions of the pion exchange mechanism to the cross-sections of the reactions NN --> NKLambda and NN --> and compare them with the contributions of the K and D exchanges. We find that the NN reactions are dominated not by pion exchange but by K and D exchanges, respectively. Moreover, assuming the SU(4) symmetry to hold approximately for the coupling constants g(ND Lambda c) = g(NK Lambda) we analyze also the production of leading Lambda(c)-hypherons in the reaction NN -> Lambda X-c. It is shown that the non-perturbative mechanism should give an essential contribution to the Lambda(c) yield for x >= 0.5.

Harvard-Zitierstil: Gasparyan, A., Grishina, V., Kondratyuk, L. and Cassing, W. (2003) Exclusive and semi-inclusive strangeness and charm production in πNN and NN reactions, The European Physical Journal A, 18(2-3), pp. 305-307. https://doi.org/10.1140/epja/i2002-10222-6

APA-Zitierstil: Gasparyan, A., Grishina, V., Kondratyuk, L., & Cassing, W. (2003). Exclusive and semi-inclusive strangeness and charm production in πNN and NN reactions. The European Physical Journal A. 18(2-3), 305-307. https://doi.org/10.1140/epja/i2002-10222-6