Publikation
| Personen: | Abelev, Betty (Autor) |
| Adam, Jaroslav (Autor) | |
| Keidel, Ralf (Autor) | |
| Adamova, Dagmar (Autor) | |
| Titel: | Measurement of prompt and non-prompt J/ψ production cross sections at mid-rapidity in pp collisions at √s=7 TeV. |
| Erscheinungsjahr: | 2012 |
| Erschienen: | arXiv.org e-print Archiv. Bd. arXiv:1205.5880 [hep-ex]. Genf, Schweiz. 2012 26 S. S. 1 - 26 |
| Publikationstyp: | Diverses |
| Weitere Angabe zur Dokumentart: | Forschungsbericht |
| Sprache: | Englisch |
| Hochschule, Einrichtung: | Fachhochschule Worms, Informatik |
| Fachhochschule Worms, Zentrum für Technologietransfer und Telekommunikation (ZTT) | |
| Inhaltszusammenfassung: | The ALICE experiment at the LHC has studied J/psi production at mid-rapidity in pp collisions at {\surd}s = 7 TeV through its electron pair decay on a data sample corresponding to an integrated luminosity L_int = 5.6nb-1. The fraction of J/psi from the decay of long-lived beauty hadrons was determined for J/psi candidates with transverse momentum pt > 1.3 GeV/c and rapidity |y| < 0.9. The cross section for prompt J/psi mesons, i.e. directly produced J/psi and prompt decays of heavier charmonium states such as the Psi(2S) and Csi_c resonances, is sigma_prompt-J/psi(pt > 1.3 GeV/c, |y| < 0.9) = 7.2 +- 0.7(stat.) +- 1.0(syst.)+1.3-1.2 (syst.pol.) mb. The pt-differential cross section for prompt J/psi has also been measured. The cross section for the production of b-hadrons decaying to J/psi with transverse momentum greater than 1.3 GeV/c in the rapidity range |y| < 0.9 is sigma_{J/psi<-h_B} = 1.26 +- 0.33 (stat.) +0.23-0.28 (syst.) mb. The results are compared to QCD model predictions. The shape of the pt and y distributions of b-quarks predicted by perturbative QCD model calculations are used to extrapolate the measured cross section to derive the bb pair total cross section and dsigma/dy at midrapidity. |
| Projekte: | ALICE/EPICS InterComLayer |
