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physics:crosssection
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| physics:crosssection [2009/06/09 10:58] – decianm | physics:crosssection [2009/06/09 11:01] (current) – decianm | ||
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| - | ===== Calculation of the Cross Section ===== | + | ====== Calculation of the Cross Section |
| ===== Introduction ===== | ===== Introduction ===== | ||
| Note that the follwing numbers all depend on the settings of the Monte Carlo generator (Pythia, in this case), as none of the quantities has been measured to a high accuracy at the LHC energy. | Note that the follwing numbers all depend on the settings of the Monte Carlo generator (Pythia, in this case), as none of the quantities has been measured to a high accuracy at the LHC energy. | ||
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| Depending on what you want to calculate you also have to take into account the acceptance of the detector and the efficiency of the reconstruction. | Depending on what you want to calculate you also have to take into account the acceptance of the detector and the efficiency of the reconstruction. | ||
| The cut that is applied in Pythia to generate events that mostly decay in the LHCb detector (angular acceptance of 400mrad) is about 34.7% for B mesons and 43.2% for b bbar inclusive. | The cut that is applied in Pythia to generate events that mostly decay in the LHCb detector (angular acceptance of 400mrad) is about 34.7% for B mesons and 43.2% for b bbar inclusive. | ||
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| + | ===== Summary ===== | ||
| + | The formula then is: | ||
| + | b bbar cross section * 2 * f_had * branching fraction * efficiency and acceptance. | ||
| + | |||
| + | The yield can the be calculated by multiplying it with the integrated luminosity. | ||
| + | |||
| ===== Links ===== | ===== Links ===== | ||
physics/crosssection.1244537920.txt.gz · Last modified: by decianm
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