Weak radiative corrections to dijet production at hadron colliders

Abstract

Abstract:We present the calculation of the most important electroweak corrections to dijet production at the LHC and the Tevatron, comprising tree-level effects of O (α s α, α 2 ) and weak loop corrections of O (α 2 s α). Although negligible for integrated cross sections, these corrections can reach 10−20% in the TeV range for transverse jet momenta k T . Our detailed discussion of numerical results comprises distributions in the dijet invariant mass and in the transverse momenta of the leading and subleading jets. We find that the weak loop corrections amount to about −12% and −10% for leading jets with k T ∼ 3 TeV at the 14 TeV LHC and k T ∼ 800 GeV at the Tevatron, respectively. The electroweak tree-level contributions are of the same generic size and typically positive at the LHC and negative at the Tevatron at high energy scales. Generally the corrections to the dijet invariant mass distributions are smaller by at least a factor of two as compared to the corresponding reach in the k T distributions, because unlike the k T spectra the invariantmass distributions are not dominated by the Sudakov regime at high energy scales.

Electroweak corrections to W-boson pair production at the LHC

“…Up to now these one-loop corrections have been evaluated for various SM benchmark processes, including tt production [27][28][29] (for earlier studies see ref. [30]), bb production [31], SM-Higgs production [32][33][34][35] and decay [36][37][38][39], and dijet production, where the purely weak corrections are known [40,41]. For the Drell-Yan process, the one-loop EW corrections have been studied in great detail by many authors (see, e.g., Ref.…”

Next-to-Next-to Leading Order QCD Predictions for Single Jet Inclusive Production at the LHC

“…We do not include nonperturbative effects in our predictions; they are quantified in [6] and found to be a 2% effect in the lowest p T bin and at most a 1% effect in all other bins (although the quoted uncertainty on the nonperturbative corrections can be as high as 9% for the lowest p T bin). The electroweak corrections computed in [37] are applied multiplicatively to the QCD calculation for central scale choice using the information provided in [6] and the total is displayed as the red dashed line. The electroweak effects are small to moderate for p T > 1 TeV for central rapidities but otherwise negligible.…”

Impact of ATLAS measurements on PDFs

“…Jets cross section calculations of wide use at LHC are available at next-to-leading order (NLO) for up to three jets in NLOJET++ [12]; electroweak (EW) corrections for jet pair production are also known since more than one decade and have been recently re-evaluated [13]; the residual theoretical perturbative uncertainty form these calculations is estimated to be about 10%. A partial next-to-next-to-leading order (NNLO) calculation for di-jet production at LHC has been recently released [14]; moreover, a new calculation of up to five jets production at NLO has been published [15]; the use of them in future PDF analyses with LHC data is expected to improve the constraints on the gluon PDF and become eventually a standard ground for NNLO QCD fits.…”

“…The electroweak corrections are expected to lower the predicted cross section at high invariant mass of the di-and three-jet systems by a few percents [13]; therefore, their use in future QCD fits using these data will be relevant. All the predictions have been corrected for non-perturbative effects by deriving correction factors with PYTHIA6 [24] and HERWIG++ [25]; the uncertainty on the non-perturbative corrections is estimated to be less than 3% for the di-jet measurement and less than 10% for the three-jet cross sections.…”