Morever as a proton-sensitive group a pyridin-2-yl substituent was attached to the para-position of the phenyl moiety in both series of compounds. The dyes include the dicyanomethylene group as an acceptor and different para-substituted alkylamines as donors. 2 we present our computational setup.Herein we report the synthesis and characterization of a new series of styryl-based push-pull dyes containing a free amino group and their Schiff base derivatives. After a review of the relevant methods in Sect. This article applies a NLO-accurate multi-leg merging formalism to the processes of and +jet production1 for the first time. For the related process of production, an implementation of a NLO QCD calculation of the inclusive process matched to a parton shower exists within the Powheg framework. Different approaches and programs are available, but the simulation currently in use in LHC experiments for production is generated with leading-order multi-leg generators using approaches like CKKW(-L) or MLM merging. Monte-Carlo event generator programs on the other hand combine fixed-order predictions and an approximate all-order resummation of QCD corrections to enable a full simulation at the hadron level. While they describe the dominant features of the given final state objects at the parton level, they are not made to simulate a realistic behaviour of the hadronic final state. Fixed-order predictions as listed above can provide such an input only to some extent. Įxperimental analyses at the LHC rely heavily on theoretical predictions for their signal and background processes. The most accurate off-shell predictions contain NNLO QCD and NLO EW corrections. Recent calculations take this finite width into account and provide predictions for the off-shell final state. In reality, the Z boson is unstable and is thus never produced as an on-shell final-state particle. Beyond the leading-order results, the first on-shell higher-order calculations included NLO QCD and, more recently, also NNLO QCD corrections. Results for on-shell production leave out the decays of the Z boson or include them only in a narrow-width or pole approximation. Theoretical predictions for production can be divided into on-shell and off-shell calculations. The process also constitutes an irreducible background in the search for the Higgs boson or new massive gauge bosons decaying to or in more inclusive searches in final states containing a photon and missing transverse momentum. The absence of couplings of the photon to the uncharged Z boson in the Standard Model can be probed by measurements in this channel, resulting in differential cross sections and limits on anomalous couplings from LEP experiments, Tevatron experiments, and by ATLAS and CMS. production plays an important role both as a signal and as a background process at the LHC. Cases where one of the photons happens to be well-isolated and high-energetic can be regarded as an individual important final state, production. The massive boson is often produced in association with photons, which are typically low-energetic or collinear with charged final state particles. The production of a Z boson is one of the standard candle processes at hadron colliders like the LHC. Author(s): Johannes Krause 1, Frank Siegert 1
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