We propose the boost asymmetry of the diboson productions $q_i{\overline{q}}_j\to V{V}^{\prime }$ in $pp$ collisions ($V{V}^{\prime }=W\gamma$, $W^{+}{W}^{-}$, and $WZ$) as a new experimental observable, which can provide unique information on the proton structure. The boost asymmetry rises as the difference in the kinematics of the two bosons, that are coupled to the two different quark and antiquark initial states, respectively, and thus reflects different features of the $q_i$ and ${\overline{q}}_j$ parton densities. By comparing the kinematics of the two bosons, such as the boson energy or rapidity, the diboson events with ${\overline{q}}_j$ having higher energy than $q_i$ can be distinguished from those with $q_i$ having higher energy than ${\overline{q}}_j$. This would provide unique information in some special parton momentum fraction regions, which cannot be directly proved by current $W$ and $Z$ measurements at the Large Hadron Collider or other deep inelastic scattering experiments.

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• Electroweak interaction
• Parton distribution functions
• Quantum chromodynamics