Publication

Measurement of eta eta production in two-photon collisions

Olivier Schneider, Aurelio Bay, Remi Léandre Albert Louvot, Chao Wang, Tagir Aushev, Vladislav Balagura, Ji Hyun Kim, Xiao Wang
2010
Journal Articles

Abstract

We report the first measurement of the differential cross section for the process gamma gamma -> eta eta in the kinematic range above the eta eta threshold, 1.096 GeV < W < 3.8 GeV over nearly the entire solid angle range, vertical bar cos theta*vertical bar

Official source

https://infoscience.epfl.ch/entities/publication/f97681bc-33d0-42c5-a859-80dc8677c19f

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Olivier Schneider, Aurelio Bay, Remi Léandre Albert Louvot, Chao Wang, Tagir Aushev, Vladislav Balagura, Ji Hyun Kim, Xiao Wang
2010
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/f97681bc-33d0-42c5-a859-80dc8677c19f

About this result

Related concepts (26)

Sampling (statistics)

In statistics, quality assurance, and survey methodology, sampling is the selection of a subset or a statistical sample (termed sample for short) of individuals from within a statistical population to estimate characteristics of the whole population. Statisticians attempt to collect samples that are representative of the population. Sampling has lower costs and faster data collection compared to recording data from the entire population, and thus, it can provide insights in cases where it is infeasible to measure an entire population.

Convenience sampling

Convenience sampling (also known as grab sampling, accidental sampling, or opportunity sampling) is a type of non-probability sampling that involves the sample being drawn from that part of the population that is close to hand. This type of sampling is most useful for pilot testing. Convenience sampling is not often recommended for research due to the possibility of sampling error and lack of representation of the population. But it can be handy depending on the situation. In some situations, convenience sampling is the only possible option.

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In mechanical engineering, a kinematic chain is an assembly of rigid bodies connected by joints to provide constrained motion that is the mathematical model for a mechanical system. As the word chain suggests, the rigid bodies, or links, are constrained by their connections to other links. An example is the simple open chain formed by links connected in series, like the usual chain, which is the kinematic model for a typical robot manipulator. Mathematical models of the connections, or joints, between two links are termed kinematic pairs.

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