Bottomonia hadroproduction

Citation
Jld. Garret et Ma. Sanchis-lozano, Bottomonia hadroproduction, NUCL PH B-P, 93, 2001, pp. 216-219
Citations number
11
Categorie Soggetti
Physics
Journal title
NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS
ISSN journal
09205632 → ACNP
Volume
93
Year of publication
2001
Pages
216 - 219
Database
ISI
SICI code
0920-5632(200103)93:<216:BH>2.0.ZU;2-S
Abstract
We analyze Tevatron data of bottomonium hadroproduction in the framework of the colour-octet model (COM) implemented in the event generator PYTHIA [1] using CTEQ4L PDF taking into account initial-state radiation of gluons and Altarelli-Parisi evolution of final-state gluons. We obtain new values for the colour-octet matrix elements (Me's) relevant to this production proces s for the Y (nS) family (n=1,2,3), finding that S-1(0)(8) +(3) P-J((8)) con tributions are not needed in the fit. We show the different contributions t o Y (1S) production at Tevatron for P-T > 8 GeV, comparing them with CDF da ta. Remarkably we find a quite small contribution (compatible with zero! fr om feeddown of chi (bJ) states produced through the colour-octet mechanism: Y (1S) indirect production via chi (bJ) decays should be mainly ascribed t o the colour-singlet model. Finally we extrapolate to LHC energies to predi ct Y (nS) production rates.