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By Klaus Rabbertz
This booklet stories the most recent experimental effects on jet physics from proton-proton collisons on the LHC. Jets let to figure out the robust coupling consistent over a variety of energies up the top ones attainable thus far, and to constrain the gluon parton distribution of the proton, either one of that are vital uncertainties on conception predictions ordinarily and for the Higgs boson in particular.
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Extra info for Jet Physics at the LHC: The Strong Force beyond the TeV Scale
Sample text
Moreover, the amount of extra particles (and energy) depends not only on the centre-of-mass energy but also on the energy scale of the primary interaction, which is characterised by the leading jet pT . In phenomenological studies everything not associated to the high- pT reaction is investigated and generically denoted as the underlying event (UE). Traditionally, this is done by geometrically subdividing an event into different regions of azimuthal angle, “towards”, “away”, and “transverse”, with respect to the jet or particle leading in pT as illustrated in Fig.
Taken from Refs. 28 left exemplifies the MSTW2008 NLO PDFs including uncertainty bands at a scale of Q 2 = 10 GeV2 . 21). An example of the most recent PDFs, displayed without uncertainties, is given in Fig. 28 right. 1 gives an overview of the primary PDF sets available for comparisons to data at NLO. In most cases, NNLO versions and further variants exist as well. As exhibited in Fig. 12 The inclusion of the heavy quarks, charm and bottom, into pQCD predictions involving PDFs requires special care.
The limited knowledge of hadron structure, PDF uncertainty; 3. the limited knowledge of the strong coupling constant, α S uncertainty; 4. the modelling and tuning of non-perturbative effects, NP uncertainty. Depending on the observable under study and the employed theoretical tools and techniques, further causes such as the fragmentation of heavy quarks, the top mass, decay constants, or limited statistical precision in numerical approximations may give rise to further uncertainties, cf. also Chap.