A new quantity for studies of dijet azimuthal decorrelations

Abstract

We introduce a new measurable quantity, $R_{\Delta \varphi }$, for studies of the rapidity and transverse momentum dependence of dijet azimuthal decorrelations in hadron-hadron collisions. In pQCD, $R_{\Delta \varphi }$ is computed as a ratio of three-jet and dijet cross sections in which the parton distribution functions cancel to a large extent. At the leading order, $R_{\Delta \varphi }$ is proportional to ${\alpha }_s$, and the transverse momentum dependence of can therefore be exploited to determine ${\alpha }_s$. We compute the NLO pQCD theory predictions and non-perturbative corrections for $R_{\Delta \varphi }$ at the LHC and the Tevatron and investigate the corresponding uncertainties. From this, we estimate the theory uncertainties for ${\alpha }_s$ determinations based on $R_{\Delta \varphi }$ at both colliders. The potential of $R_{\Delta \varphi }$ measurements for tuning Monte Carlo event generators is also demonstrated.

20 pages, 11 figures, 1 table, submitted to JHEP

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Cited by in corpus (4)

• Measurement of dijet azimuthal decorrelations in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector and determination of the strong coupling
• Measurement of the combined rapidity and $p_T$ dependence of dijet azimuthal decorrelations in $p\bar{p}$ collisions at $\sqrt{s}=1.96$TeV
• Dijet azimuthal decorrelations for $\Delta {\varphi }_{\mathrm{dijet}}<2\pi /3$ in perturbative QCD
• Measurement of multijet azimuthal correlations and determination of the strong coupling in proton-proton collisions at $\sqrt{s}$ = 13 TeV