W and Z bosons physics at LHC at low luminosity
The W and Z bosons production cross sections at LHC will be huge: Σ(pp → W → lv) ≈ 20 nb, Σ(pp → Z → l + l ™) ≈ 2nb. Moreover the W and Z production and decay processes have been measured with high accuracy in previous experiments. Thus the W and Z bosons will play a key role during the first data taking at LHC allowing to test the detector performances and to tune the Monte Carlo generators. In fact, with only 1fb−1 of integrated luminosity, the processes involving EW bosons will be used to calibrate Electromagnetic Calorimeters and to align Muon and Tracker Systems. With 10 fb−1 of integrated luminosity, the study of Z and W events will improve our knowledge of the Parton Distribution Functions (PDF) and it will provide a raw luminosity monitoring. In the following we will focus on these EW bosons studies achievable already at low luminosity. These analysis hold the key for all the future searches because they provide the way to control many of the main experimental and theoretical systematics at LHC.
KeywordsTransverse Momentum Parton Distribution Function Integrate Luminosity Electromagnetic Calorimeter Parton Distribution Function
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