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Measurement of the Electron Charge Asymmetry in Inclusive $W$ Production in $pp$ Collisions at $\sqrt{s}=7$ TeV

The CMS collaboration
Phys.Rev.Lett. 109 (2012) 111806, 2012.

Abstract (data abstract)
CERN-LHC. A measurement of the electron charge asymmetry in inclusive $pp \rightarrow W + X \rightarrow e \nu + X$ production at $\sqrt{s}$ = 7 TeV is presented based on data recorded by the CMS detector at the LHC and corresponding to an integrated luminosity of 840 pb$^{-1}$. The electron charge asymmetry reflects the unequal production of $W^+$ and $W^-$ bosons in $pp$ collisions. The electron charge asymmetry is measured in bins of absolute value of electron pseudorapidity in the range of $|\eta|$ < 2.4. The asymmetry rises from about 0.1 to 0.2 as a function of the pseudorapidity and is measured with a relative precision better than 7%. This measurement provides new stringent constraints for parton distribution functions.

  • Table 1

    Data from Table III and Figure 2


    Summary of the measured charge asymmetry results. The first uncertainty is statistical and the second is systematic. The theoretical predictions...

  • Table 2

    Data from Table II


    Covariance matrix for the systematic uncertainties on the asymmetry. All values are given in units of $10^{-6}$.

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