Würzburg 2018 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 83: Elektroschwache Wechselwirkung II

T 83.1: Vortrag

Donnerstag, 22. März 2018, 16:30–16:45, Z6 - SR 1.005

The measurement of W-charge asymmetry at 13 TeV with the CMS detector — •Vladyslav Danilov¹, Mariarosaria D’Alfonso², Elisabetta Gallo¹, Volodymyr Myronenko¹, and Katarzyna Wichmann¹ — ¹DESY, Hamburg, Germany — ²MIT, Cambridge, Massachusetts, USA

In pp collisions at the LHC, rates of ud annihilation dominate over dū. Consequently, W⁺-boson production prevails over W⁻, which results in an effect called W-charge asymmetry, A.
The analysis is based on the data sample corresponding to an integrated luminosity of 2.3 fb⁻¹ recorded by the CMS detector over the year 2015. The events with W bosons decaying via the muon channel are selected. The signal extraction and background determination are performed using template fits to missing E_T distributions. The differential cross sections are used to calculate the W asymmetry in bins of rapidity, A(η).
The presented measurement is sensitive to u/d ratio and the sea quark content in the proton and is used in global QCD analysis to determine parton density function.