Are b-PDFs (and b-fragmentation functions) needed at the LHC?

30 Apr 2014, 14:25
25m
Auditorium (BUW)

Auditorium

BUW

Oral presentation WG1: Structure Functions and Parton Densities WG1: Structure Functions and Parton Densities

Speaker

Dr Maria Ubiali (University of Cambridge)

Description

Several key processes at the LHC in the standard model and beyond that involve bottom quarks, such as single-top, Higgs, and weak vector boson associated production, can be described in QCD either in a 4-flavor or 5-flavor scheme. In the former, b quarks appear only in the final state and are typically considered massive. In 5-flavor schemes, calculations include b quarks in the initial state, are simpler and allow the resummation of possibly large initial state logarithms of the type log(Q/mb) into the b parton distribution function (PDF), Q being the typical scale of the hard process. An analogous classification can be applied to processes involving bottom quarks in the final state, in which the b fragmentation acts like the b PDF. In this talk, I provide an explanation of why and how a substantial agreement between total cross sections can be obtained in the two schemes, as far as the initial state is concerned, and I present preliminary results for processes featuring heavy quarks in the final state.

Primary author

Dr Maria Ubiali (University of Cambridge)

Presentation Materials

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