SEMINARIO Dr. Andre HOANG (University Vienna).
Laboratori Nazionali di Frascati Via Enrico Fermi, 54 (gia'40), 00044 Frascati (Roma)
Title: Interpretation of the top-quark mass parameter
In my talk I discuss on what is currently known on the theoretical interpretation of the top-quark mass parameter in Monte-Carlo event generators (MCs), as measured in the direct top-mass measurements. The interpretation is associated to the perturbative part of the MCs, namely the parton shower, as well as on the way how the infrared evolution of the parton shower is terminated through the cutoff parameter. Nevertheless, also the hadronization model plays an important role. This implies that, in order to solve the top-mass interpretation problem, the shower cutoff should be treated like a factorization scale and not like a tuned parameter. I explain the conceptual and practical implications of this rather novel view, and its interplay with the top-mass calibration method, which I have developed some time ago.