<p>The mass of the $W$ boson is one of the most important parameters in the </p><p>Standard Model. A precise measurement of the $W$ boson mass, together </p><p>with a precise measurement of the top quark mass, can constrain the </p><p>mass of the undiscovered Higgs boson within the Standard Model </p><p>framework or give a hint for physics beyond the Standard Model. </p><p>This dissertation describes a measurement of the $W$ boson mass </p><p> through its decay into a muon and a neutrino using </p><p> $\approx$ 2.2 fb$^{-1}$ of $\sqrt{s} = 1.96$ TeV $p\bar{p}$ data taken </p><p> with the CDF II detector at Fermilab. We measure the $W$ boson mass </p><p> to be ($80.374 \pm 0.015_{\rm stat.} \pm 0.016_{\rm syst.}$) </p><p> GeV/c$^2$. This result, when combined with the $W$ mass </p><p> measurement in the electron channel, leads to the single most </p><p> precise $m_W$ value and greatly constrains the possible mass </p><p> range of the undiscovered Higgs boson.</p> / Dissertation

University, Diss., 2004--München.

Universiẗat, Diss., 2004--München.

Universiẗat, Diss., 2001--München.

University, Diss., 2001--München.

University, Diss., 2000--Freiburg (Breisgau). / Parallelt.: Measurement of single w production and triple gauge boson couplings in e+e- collisions at s=161-189 GeV. Text. engl.

Techn. Hochsch., Diss., 2000--Aachen. / Gedr. Ausg. im Physikalischen Inst., Aachen.

University, Diss., 2002--Heidelberg.

A measurement of the electron charge asymmetry in p+→W production in association with jets at sqrt{s}=7 TeV is presented. The dataset corresponds to an integrated luminosity of L=5fb^-1 recorded by the CMS detector in proton-proton collisions at the LHC. The sample represents a large increase in statistical precision with respect to previous CMS results and describes a first study of charge asymmetry measured in p+p→W+1 jet events. Full comparisons to previous results and theoretical predictions are provided and recommendations for extending the analysis to produce valuable input for future PDF models are made.

La these porte sur les corrections mixtes QCD-EW au niveau NNLO a la productionDrell-Yan de bosons Z et W. Le processus Drell-Yan est un processus fondamentalpermettant de tester avec precision le Modele Standard (MS) de physique des partic-ules au sein de collisionneurs hadroniques, car ce dernier presente une section ecaceimportante, une signature experimentale tres propre, ainsi qu'une tres haute sensi-bilite aux proprietes des bosons de jauge. Pour toutes ces raisons, une prediction theorique precise et able, siginant ici que l'on garde sous contr^ole lestermes provenant des corrections perturbatives d'ordre superieur de la section ecaceet des distributions du mecanisme de production de Drell-Yan, est exigee pour menera bien des etudes de physique au niveau de collisionneurs hadroniques.Dans cette thèse , nous étudions les corrections QCD mixtes - EW à Drell - Yan traite à la NNLO . D'un point de vue technique , le calcul d'un tel ensemble de corrections impliquerait le cal-tion de diagrammes de Feynman très compliquées , La plus grande contribution provient des diagrammes dans lesquels la particule de décomposition ( Z ou boson W ) est presque sur - coquille.En utilisant les règles Cutkosky , nous pouvons ré-écrire l'intégration sur l'espace de phase de latermes d'interférence ( une boucle 2 à 2 diagrammes interféré avec le niveau arbre 2 à 2 etarbre 2 ou 3 diagrammes carré ) en termes de combinaison des intégrales de propagationteurs ayant la prescription et propagateurs de causalité droite avec une face .Ces intégrales peuvent être traités de la même manière que les corrections virtuelles . Cette réduction se fait en utilisant l' algorithme Laporta \ " , sur la base del'intégration par parties identités . Le calcul de l' IM est réalisée en utilisant la méthode de la différenceéquations. En conséquence , nous obtenons l' IM exprimée en série de Laurent ,où D est la dimension de l'espace - temps , la multiplication d'un facteur qui prend entenir compte de la limite souple de l'intégrale en D dimensions . / The thesis concerns the NNLO mixed QCD-EW corrections to the Drell-Yan (DY)production of Z andW bosons, via the following reactions: pp(p) Z+X to l + Xand pp to W + X to l + X. This is a fundamental process for an accurate testof the Standard Model (SM) at hadron colliders, since it has a large cross section, aclean experimental signature. In particular, the Drell-Yan production of Ws is important for an accuratedetermination (via transverse mass and pT distributions) of the W mass, mW, aninput parameter of the model. Because of all these reasons, an accurate and reliable theoretical prediction forthe cross section and the distributions of the Drell-Yan production mechanism, thatmeans control on the higher-order perturbative corrections, is demanded for physicsstudies at hadron colliders. In this thesis, we study the mixed QCD-EW corrections to Drell-Yan processes at the NNLO. From a technical point of view, the calculation of such a set of corrections would involve the calcu-lation of very complicated Feynman diagrams, The biggest contribution comes from the diagrams in which the decaying particle(Z or W boson) is nearly on-shell. Using the Cutkosky rules, we can re-write the integration over the phase-space of theinterference terms (one-loop 2 to 2 diagrams interfered with the tree-level 2 to 2 andtree 2 to 3 diagrams squared) in terms of a combination of integrals with propaga-tors having the right causality prescription and propagators with the opposite one.These integrals can be treated in the same way as the virtual corrections. This reduction is done using the \Laporta Algorithm", based onthe Integration-by-Parts Identities. The calculation of the MIs is performed using the method of differentialequations. As a result, we get the MIs expressed as a Laurent series ,where D is the dimension of the space-time, multiplying a factor which takes intoaccount the soft limit of the integral in D dimensions.