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43 lines
2 KiB
TeX
43 lines
2 KiB
TeX
\chapter{Phenomenological Studies of the Diphoton Process in Proton-Proton
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Scattering}%
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\label{chap:pheno}
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\begin{figure}[h!]
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\centering
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\includegraphics[width=.6\textwidth]{figs/event.pdf}
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\caption[The anatomy of a \(t\bar{t}h\) event.]{\label{fig:anatomy}
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The anatomy of a \(t\bar{t}h\) event. Taken
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from~\cite{Gleisberg:2008ta}. Described below.}
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\end{figure}
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%
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In real proton scattering the hard process discussed in
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\cref{chap:pdf} is only a part of the whole event. \Cref{fig:anatomy}
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shows a pictorial representation of the plethora of processes taking
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place around the hard event (red), marking distinct processes in the
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event generator by different colors. Partons do in general have some
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intrinsic transverse momentum. Scattered charges radiate in both QCD
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and QED, both giving rise to shower-like cascades (blue, yellow) and
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both can lead to additional transverse momentum of the initial state
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partons. The remnants of the proton can radiate showers themselves,
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scatter in more or less hard processes (Multiple Interactions, MI,
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purple blob) and affect the hard process through color
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correlation. Finally the partons from the showers recombine into
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hadrons (hadronization, light green blobs) due to QCD
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confinement. This last effect doesn't produce diphoton-relevant
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background directly, but affects photon isolation. Those hadrons then
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decay if they are unstable (dark green blobs), producing even more
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final state particles. All of those processes have to be taken into
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account to generate events that can be compared with experimental
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data.~\cite{buckley:2011ge,Gleisberg:2008ta}
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These effects can be calculated or modeled on an per-event base by
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modern Monte Carlo event generators like \sherpa. But these
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calculations and models are approximations in most cases. This is done
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for the diphoton process in a gradual way described in
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\cref{sec:setupan}. Histograms of observables are generated and
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discussed in \cref{sec:disco}.
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%%% Local Variables:
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%%% mode: latex
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%%% TeX-master: "../document"
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%%% End:
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