capitalize Monte Carlo

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hiro98 2020-05-30 19:05:02 +02:00
parent cabd1512b0
commit 7500276bde
5 changed files with 15 additions and 15 deletions

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The analytical cross section for the parton-level \(\qqgg\) diphoton
process is calculated. With the application to this in mind, some
monte carlo integration and sampling methods are studied, implemented
Monte Carlo integration and sampling methods are studied, implemented
and compared. Proton-Proton scattering is simulated on the partonic
level through the use of parton density functions. Throughout,
obtained results are verified through comparison with the \sherpa\
@ -15,7 +15,7 @@ including parton showers, hadronization and multiple interactions at
Der analytische wirkungsquerschnitt fuer den \(\qqgg\) diphoton prozess
wird berechnet. Mit hinblick auf die Anwendung auf diesen Prozess
werden monte carlo Methoden untersucht, implementiert und
werden Monte Carlo Methoden untersucht, implementiert und
verglichen. Proton-Proton Streuung wird auf der partonischen ebene
mithilfe von parton-density Funktionen simuliert. Gewonnene resultate
werden durchweg mit dem \sherpa\ event generator verifiziert. Zuletzt

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Monte carlo methods have been and still are one of the most important
tools for theoretical calculations in particle physics. Be it for
validating the well established standard model or for making
predictions about new theories, monte carlo simulations are the
predictions about new theories, Monte Carlo simulations are the
crucial interface of theory and experimental data, making them
directly comparable. Furthermore horizontal scaling is almost trivial
to implement in monte carlo algorithms, making them well adapted to
modern parallel computing. In this the thesis, the use of monte carlo
to implement in Monte Carlo algorithms, making them well adapted to
modern parallel computing. In this the thesis, the use of Monte Carlo
methods will be traced through from simple integration to the
simulation of proton-proton scattering.
@ -22,11 +22,11 @@ scope of this thesis. The differential and total cross section of this
process is being calculated in leading order in \cref{chap:qqgg} and
the obtained result is compared to the total cross section obtained
with the \sherpa~\cite{Gleisberg:2008ta} event generator, used as
matrix element integrator. In \cref{chap:mc} some simple monte carlo
matrix element integrator. In \cref{chap:mc} some simple Monte Carlo
methods are discussed, implemented and their results compared. First
monte carlo integration is studies and the \vegas\
Monte Carlo integration is studies and the \vegas\
algorithm~\cite{Lepage:19781an} is implemented and
evaluated. Subsequently monte carlo sampling methods are explored and
evaluated. Subsequently Monte Carlo sampling methods are explored and
the output of \vegas\ is used to improve the sampling
efficiency. Histograms of observables are generated and compared to
histograms from \sherpa using the \rivet~\cite{Bierlich:2019rhm}

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@ -9,7 +9,7 @@ probability density on
with a \(1\) in the fashion of \cref{eq:baseintegral}, the Integral
of \(f\) over \(\Omega\) can be interpreted as the expected value
\(\EX{F/\Rho}\) of the random variable \(F/\Rho\) under the
distribution \(\rho\). This is the key to most monte carlo methods.
distribution \(\rho\). This is the key to most Monte Carlo methods.
\begin{equation}
\label{eq:baseintegral}
@ -77,9 +77,9 @@ The convergence of \cref{eq:approxexp} is not dependent on the
dimensionality of the integration volume as opposed to many other
numerical integration algorithms (trapezoid rule, Simpsons rule) that
usually converge like \(N^{-\frac{k}{n}}\) with \(k\in\mathbb{N}\) as
opposed to \(N^{-\frac{k}{n}}\) with monte carlo. Because integrals in
particle physics usually have a high dimensionality, monte carlo
integration is suitable there. When implementing monte carlo methods,
opposed to \(N^{-\frac{k}{n}}\) with Monte Carlo. Because integrals in
particle physics usually have a high dimensionality, Monte Carlo
integration is suitable there. When implementing Monte Carlo methods,
the random samples can be obtained through hardware or software random
number generators (RNGs). Most implementations utilize software RNGs
because supply pseudo-random numbers in a reproducible way, which

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@ -97,7 +97,7 @@ stratified sampling (as discussed in \cref{sec:stratsamp-real}) and
the hit-or-miss method. Because the stratified sampling requires very
accurate upper bounds, they have been overestimated by
\result{xs/python/pdf/overesimate}, which lowers the efficiency
slightly but reduces bias. The monte carlo integrator was used to
slightly but reduces bias. The Monte Carlo integrator was used to
estimate the location of the maximum in each hypercube and then this
estimate was improved by gradient ascend\footnote{Which becomes
problematic, when performed close to a cut.}.

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\label{sec:compsher}
The result obtained in \cref{sec:qqggcalc} shall now be verified by the
monte carlo event generator \sherpa{}~\cite{Gleisberg:2008ta}. To
Monte Carlo event generator \sherpa{}~\cite{Gleisberg:2008ta}. To
facilitate this, an expression for the total cross section for a range
of \(\theta\) or \(\eta\) has to be obtained. Using the golden rule
for \(2\rightarrow 2\) processes and observing that the initial and
@ -86,7 +86,7 @@ an interval of \([-\eta, \eta]\), is dominated by the linear
contributions in \cref{eq:total-crossec} and would result in an
infinity if no cut on \(\eta\) would be made. Choosing
\(\eta\in [-2.5,2.5]\) and \(\ecm=\SI{100}{\giga\electronvolt}\) the
process was monte carlo integrated in \sherpa\ using the runcard
process was Monte Carlo integrated in \sherpa\ using the runcard
in \cref{sec:qqggruncard}. This runcard describes the exact same (first
order) process as the calculated cross section.