Electroweak corrections to Wγ and Zγ production at the LHC

Abstract

Abstract:We have calculated the electroweak O(α) corrections to the processes pp → Zγ + X → ν lνl γ + X, pp → Zγ + X → llγ + X, and pp → Wγ + X → ν ll γ + X at the LHC, with l = e, µ and ν l = ν e , ν µ , ν τ . The virtual corrections are evaluated in leading-pole approximation, whereas the real corrections are taken into account exactly. These corrections are implemented into a Monte Carlo generator which includes both phase-space slicing and subtraction to deal with soft and collinear singularities. We present numerical results for total cross sections as well as for experimentally interesting distributions. Applying typical LHC cuts, the electroweak corrections are of the order of −5% for the total cross sections and exceed −20% for observables dominated by high centre-of-mass energies of the partonic processes.

RECOLA2: REcursive Computation of One-Loop Amplitudes 2

“…• Transverse polarization vectors (for massless and massive vector bosons): A variety of processes has been checked at LO and NLO with the in-house code Pole [65] and the code OpenLoops [14]. The typical agreement for NLO matrix elements ranges from 10 −14 for processes with 4 external legs to 10 −10 for processes with 6 external legs in the comparison with Pole, and from 10 −12 to 10 −8 in the comparison with OpenLoops.…”

The two-loop master integrals for $ q\overline{q} $ → VV

“…The full set of NLO QCD corrections [1][2][3][4] and large parts of the NLO electroweak corrections [5][6][7][8][9][10] have been derived for vector boson pair production. NNLO QCD corrections were calculated up to now for γγ [11] and Zγ [12] production.…”

Electroweak corrections to W-boson pair production at the LHC

“…So far, EW corrections to vector-boson pair production at the LHC are only known in the high-energy approximation [51][52][53], while the full one-loop EW corrections are not yet available, despite their great phenomenological interest. These processes contribute the most important irreducible background to the production of a SM Higgs boson in the intermediate mass range.…”