Future prospects for parton showers
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In this brief Snowmass White Paper for the Theory Frontier, we argue that there have been important recent developments in the algorithms used to generate a simulated parton shower and that further progress can be achieved in the coming decade. A much more detailed exposition can be found in a corresponding White Paper of the Energy Frontier.Keywords:
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Parton shower
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One can use more than one scale variable to define the family of surfaces in the space of parton splitting parameters that define the evolution of a parton shower. In an earlier paper, we developed this idea for electron-positron annihilation. Here, we use multiple scale variables for a parton shower with initial state partons. Then we need a more sophisticated analysis because the evolution of parton distribution functions must be coordinated with the parton shower evolution. We make the needed connections more precise than in our earlier work, even for the case of just one scale variable. Then we develop an example with three scale variables, which leads to advantages compared to the usual shower formulation with only one scale variable. We provide results for Drell-Yan muon pair production.
Parton shower
Annihilation
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We present an implementation of a parton shower algorithm for hadron colliders and electron-positron colliders based on the dipole factorization formulas. The algorithm treats initial-state partons on equal footing with final-state partons. We implemented the algorithm for massless and massive partons.
Parton shower
Massless particle
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Parton shower
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Initial state evolution in parton shower event generators involves parton distribution functions. We examine the probability for the system to evolve from a higher scale to a lower scale without an initial state splitting. A simple argument suggests that this probability, when multiplied by the ratio of the parton distributions at the two scales, should be independent of the parton distribution functions. We call this the PDF property. We examine whether the PDF property actually holds using Pythia and Deductor. We also test a related property for the Deductor shower and discuss the physics behind the results.
Parton shower
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Exposition is a widelyused type of literature. It illustrates the characteristic, the nature, the happening, the development and the result of things. This essay is to classify exposition and introduce the writing methods of every kind.
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The three articles of exposition with the style of quotation in Huai Nan Zi carried forward but mostly developed and innovated the style of writing and making exposition in Analects of Confucius and Lao Tzu.All of them demonstrated a quite mature art of thinking and making exposition and strived to give prominence to the imaginable thinking peculiar to literature.
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The World Exposition is the largest concentrative platform for intercultural communication.Proceeding from the history of exposition and cultural communication,this article analyzes the intercultural communication of exposition in the aspects such as form,characteristic,tremendous influence.Then this paper prospects the future of Shanghai Exposition 2010 and gives some suggestions to it.
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