Searcharxiv⌕ Search

arXiv subjects

Germán Rodrigo

Publications and source records attributed to Germán Rodrigo.

40 records · Page 3Linked to original sources
arXiv1997

Quark mass effects in QCD jets

The effects induced by the quark masses in three-jet observables have been studied in this thesis. In particular, we have explored a new method: the study of three-jet observables at LEP, different from QCD Sum Rules and Lattice calculations, for determining the b-quark mass. Among other advantages, it would allow to extract the b quark mass far from threshold, in contrast to the other methods described above and it would provide a test of the QCD Renormalization Group predictions. From our NLO calculation, we have estimated, by exploring the $μ$-dependence of our prediction at m_Z, a theoretical b-quark mass uncertainty of at most 250(MeV) in the DURHAM algorithm, 300(MeV) for JADE and EM and 500(MeV) for the E algorithm. Furthermore, quark mass effects are expected to be quite more important in top production at NLC (Next Linear Collider) and our calculation would be of a great interest.

hep-ph↗
arXiv1996

Quark mass effects in QCD jets

We present the calculation of the decay width of the Z-boson into three jets including complete quark mass effects to second order in the strong coupling constant. The study is done for different jet clustering algorithms such as EM, JADE, E and DURHAM. Because three-jet observables are very sensitive to the quark mass we consider the possibility of extracting the bottom quark mass from LEP data.

hep-ph↗
arXiv1994

Three-jet production at LEP and the bottom quark mass

We consider the possibility of extracting the bottom quark mass from LEP data. The inclusive decay rate for $\zbb +\cdots$ is obtained at order $\as$ by summing up the one-loop two-parton decay rate to the tree-level three-parton rate. We calculate the decay width of the $Z$-boson into two and three jets containing the $b$-quark including complete quark mass effects. In particular, we give analytic results for a slight modification of the JADE clustering algorithm. We also study the angular distribution with respect to the angle formed between the gluon and the quark jets, which has a strong dependence on the quark mass. The impact of higher order QCD corrections on these observables is briefly discussed. Finally, we present numerical results for some popular jet-clustering algorithms and show that, indeed, these three-jet observables are very sensitive to the $b$-quark mass and well suited for its determination at LEP.

hep-ph↗