Svenska:

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English:

The webpage you reached is made available for archiving purposes only. The official division of particle physics webpages can be found at http://particlephysics.physics.lu.se

The page below is not updated any longer since September 22, 2020 and does not conform completely to the accessibility regulation. See the accessibility statement

$\gamma$$\gamma$-Collision Data

Before any two photon physics analysis can be performed on the VSAT data, it is necessary to both purify the data from background as well as calculating the size of the total $\gamma$$\gamma$ sample. Good purity is needed to extract physical properties of the two-photons events. The determination of the expected number of $\gamma$$\gamma$ events seen in the VSAT is needed to compare data with Monte Carlo and to estimate the remaining background.