Abstract
We discuss the measurements of the anomalous triple gauge couplings at Large Hadron Collider focusing on the contribution of the mathcal{O} 3W and {mathcal{O}}_{3tilde{W}} operators. These deviations were known to be particularly hard to measure due to their suppressed interference with the SM amplitudes in the inclusive processes, leading to approximate flat directions in the space of these Wilson coefficients. We present the prospects for the measurements of these interactions at HL-LHC and HE-LHC using exclusive variables sensitive to the interference terms and taking carefully into account effects appearing due to NLO QCD corrections.
Highlights
In view of this, precision studies of all the possibile deformations from the SM due to new states not directly accessible at current collider energies become a crucial task for the present and future experimental program
We present the prospects for the measurements of these interactions at High-Luminosity program of the LHC (HL-LHC) and HE-LHC using exclusive variables sensitive to the interference terms and taking carefully into account effects appearing due to NLO QCD corrections
In the analysis that we describe we will bin the events in function of the transverse mass of the W γ system, for analogy with what has been done for the W Z case, where we have used the mTW Z variable of eq (3.2)
Summary
We will review the main results regarding the interference suppression from the helicity selection rules [6] and the possible strategies to overcome it recently proposed in [7, 8]. In [6] it was shown that ai0nt (the leading contribution to the interference term) is equal to zero for all of the processes containing transversely polarized vector bosons. This effect comes from the fact that the SM and NP amplitudes contain transverse vector bosons in the different helicity eigenstates, for which the interference vanishes. This interference suppressions implies that the high energy measurements of the Wilson coefficients will not benefit from the usual growth of the amplitudes with the energy expected from dimension six operators. This negatively affects the possibilities of high-energy hadron colliders, where the strongest bounds can usually be obtained by exploiting the relative enhancement of the NP contribution compared to the SM one in the high energy distribution tails [12,13,14,15,16,17,18,19,20,21,22,23]
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