Measurements of $WW$ and $WZ$ production in $W$ + jets final states in $p\bar p$ collisions

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Date

2012

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American Physical Society

Abstract

We study $WW$ and $WZ$ production with $ℓνqq\ (ℓ=e,μ)$ final states using data collected by the D0 detector at the Fermilab Tevatron Collider corresponding to $4.3  \text{fb}^{−1}$ of integrated luminosity from $p\bar p$ collisions at $\sqrt s=1.96  \text{TeV}$. Assuming the ratio between the production cross sections $σ(WW)$ and $σ(WZ)$ as predicted by the standard model, we measure the total $WV (V=W,Z)$ cross section to be $σ(WV)=19.6^{+3.2}_{−3.0}  \text{pb}$ and reject the background-only hypothesis at a level of 7.9 standard deviations. We also use $b$-jet discrimination to separate the $WZ$ component from the dominant $WW$ component. Simultaneously fitting $WW$ and $WZ$ contributions, we measure $σ(WW)=15.9^{+3.7}_{−3.2}  \text{pb}$ and $σ(WZ)=3.3^{+4.1}_{−3.3} \text{pb}$, which is consistent with the standard model predictions.

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Keywords

Cross section, Fermilab Tevatron collider;Finalstate, Integrated luminosity, Standard deviation, The standard model, Atomic physics, Physics, Tellurium compounds, Production cross section, Final state

Citation

Abazov, V. M., Abbott, B., Acharya, B. S., Adams, M., Adams, T., Alexeev, G. D., . . . Zivkovic, L. (2012). Measurements of $WW$ and $WZ$ production in $W$ + jets final states in $p\bar p$ collisions. Physical Review Letters, 108(18), 181803. http://dx.doi.org/10.1103/PhysRevLett.108.181803

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© 2012 American Physical Society.

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Article