Validation of the muon momentum resolution in view of the W mass measurement with the CMS experiment

In the framework of the Standard Model, the electroweak theory predictsrelations among observables which can be measured. After the discovery ofthe Higgs boson, all the parameters of the Standard Model are known andit is thus possible to predict those observables with increasing precision inorder to test the consistency of the model. A small deviation of measuredvalues from those predictions would be an indirect hint of physics beyondthe Standard Model.In particular, the mass of the W boson has a far smaller uncertainty inthe theoretical prediction than in the measured value. For this reason, anaccurate measurement of the W mass would provide such a test of validityof the Standard Model.In order to achieve the precision required to have a fair comparison with thetheory, it is necessary to control the distributions of the variables enteringthe measurement at the permil level or even better.The CMS experiment is planning to deliver a precise measurement of MWwithin the next years, analysing events of W decaying to a muon and aneutrino. One of the main systematics on the measurements is the knowledgeof the muon momentum scale and resolution, precisely determined fromresonances decaying in two muons. The aim of this thesis is to provide avalidation of the muon momentum resolution at better than 5% enabling ameasurement of the muon momentum scale at 0.1 permil level.This thesis contains also a preliminary study on one of the CMS subdetectors, allowing to measure its material budget at a few percent level.