Abstract
Signatures with an electroweak vector boson and many jets play a crucial role at the Large Hadron Collider, both in the measurement of Standard-Model parameters and in searches for new physics. Precise predictions for these multi-scale processes are therefore indispensable. We present next-to-leading order QCD predictions for $W^\pm/Z$+jets at $\sqrt{s}=13$ TeV, including up to five/four jets in the final state. All production channels are included and leptonic decays of the vector bosons are considered at the amplitude level. We assess theoretical uncertainties arising from renormalization- and factorization-scale dependence by considering fixed-order dynamical scales based on the $H_{\rm T}$ variable as well as on the MiNLO procedure. We also explore uncertainties associated to different choices of parton-distribution functions. We provide event samples that can be explored through publicly available $n$-tuple sets, generated with BlackHat in combination with SHERPA.
Highlights
During the 7 and 8 TeV runs of the Large Hadron Collider (LHC), the ATLAS and CMS experiments have scrutinized electroweak vector boson production in association with multiple light jets in great detail [1,2,3,4]
We notice that the LO scale dependence for V þ 1 jet, which appears at around 4%, is not representative of the associated theoretical uncertainties, in particular due to kinematical constraints that are released at next-to-leading order (NLO)
Since these processes constitute an important background to many new physics searches involving missing energy, as well as precise top-quark measurements, the theoretical predictions we provide are an important ingredient to fully exploit the discovery potential of the LHC in the upcoming years
Summary
During the 7 and 8 TeV runs of the Large Hadron Collider (LHC), the ATLAS and CMS experiments have scrutinized electroweak vector boson production in association with multiple light jets in great detail [1,2,3,4]. Both collaborations presented first measurements [5,6] of this class of processes at an energy of 13 TeV These studies have shown the extent to which theoretical predictions produced both by dedicated calculations or by general Monte Carlo event generators can describe total rates and differential distributions for signatures that involve leptons, missing transverse energy, and many light jets. Such characterizations are of key importance given that searches for new physics carried out at hadron colliders target similar final states.
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