rpp2010-rev-w-mass - 1 THE MASS AND WIDTH OF THE W BOSON...

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–1– THE MASS AND WIDTH OF THE W BOSON Revised March 2010 by M. W. Gr¨unewald (University Ghent), and A. Gurtu (Tata Inst.). The W mass and width defnition used here corresponds to a Breit-Wigner with mass-dependent width. Until 1995, the production and study oF the W boson was the exclusive domain oF the pp colliders at CERN and ±ermilab. W production at hadron colliders is tagged by a high p T lepton From W decay. Owing to unknown parton– parton e²ective energy and missing energy in the longitudinal direction, the experiments reconstruct only the transverse mass oF the W , and derive the W mass From comparing the transverse mass distribution with Monte Carlo predictions as a Function oF M W . These analyses use the electron and muon decay modes oF the W boson. Beginning in 1996, the energy oF the LEP accelerator in- creased to above 161 GeV, the threshold For W –pair production. A precise knowledge oF the e + e - center-oF-mass energy enables one to reconstruct the W mass, even iF one oF them decays leptonically. At LEP two methods have been used to obtain the W mass. In the frst method, the measured W –pair production cross sections, σ ( e + e - W + W - ), have been used to deter- mine the W
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This note was uploaded on 06/07/2011 for the course PHYS 4132 taught by Professor Kutter during the Spring '11 term at University of Florida.

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rpp2010-rev-w-mass - 1 THE MASS AND WIDTH OF THE W BOSON...

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