6533b821fe1ef96bd127b7c2
RESEARCH PRODUCT
Determination of the muonic branching ratio of the W boson and its total width via cross-section measurements at the Tevatron and LHC
Stefano CamardaJakub CúthMatthias Schottsubject
Particle physicsPhysics and Astronomy (miscellaneous)HadronTevatronFOS: Physical sciences01 natural sciencesStandard Modellaw.inventionHigh Energy Physics - ExperimentHigh Energy Physics - Experiment (hep-ex)High Energy Physics - Phenomenology (hep-ph)law0103 physical sciences010306 general physicsColliderEngineering (miscellaneous)PhysicsLarge Hadron Collider010308 nuclear & particles physicsBranching fractionHigh Energy Physics::PhenomenologyObservableHigh Energy Physics - PhenomenologyProduction (computer science)High Energy Physics::ExperimentParticle Physics - Experimentdescription
The total $W$-boson decay width $\Gamma_W$ is an important observable which allows testing of the standard model. The current world average value is based on direct measurements of final state kinematic properties of $W$-boson decays, and has a relative uncertainty of 2%. The indirect determination of $\Gamma_W$ via the cross-section measurements of vector-boson production can lead to a similar accuracy. The same methodology leads also to a determination of the leptonic branching ratio. This approach has been successfully pursued by the CDF and D0 experiments at the Tevatron collider, as well as by the CMS collaboration at the LHC. In this paper we present for the first time a combination of the available measurements at hadron colliders, accounting for the correlations of the associated systematic uncertainties. Our combination leads to values of $\textrm{BR}(W\rightarrow\mu\nu)=(10.72 \pm 0.16)\%$ and $\Gamma_W = 2113 \pm 31$ MeV, respectively, both compatible with the current world averages.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-07-18 | European Physical Journal C |