Measurement of the Zγ→νν‾γ production cross section in pp collisions at s

Wγ production in hadronic collisions using the POWHEG+MiNLO method

“…The real contribution, corresponding to the collinear photon region of the jj → νγj real process (also corresponding to an electromagnetic correction) is instead included. 9 In a variant of the C scheme that will be described later, all strong corrections to the jj → νj underlying Born kinematics are also included.…”

“…Aside from γγ production, the production processes of a W or Z boson in association with an isolated photon provide the largest and cleanest yields among diboson final states at hadron colliders, as backgrounds to W γ and Zγ production can be significantly reduced through the identification of the W and Z bosons via their leptonic decay modes. Measurements of V γ (V = W, Z) processes from initial analyses at the LHC have been performed both by the ATLAS [4][5][6][7] and by the CMS collaboration [8][9][10]. These measurements have been used to test the SM predictions, to set limits on anomalous triple gauge couplings (ATGCs) and on the production of new vector resonances.…”

Direct photon production and PDF fits reloaded

“…In addition to their relevance for PDF fits, photon production at the LHC is of great interest in searches for new physics beyond the standard model (BSM). For instance, recent searches for BSM physics with photons in the final state from ATLAS and CMS include searches for new particles by looking for high-mass resonances [25][26][27], anomalous couplings [28][29][30][31], and by measuring missing E T distributions [32][33][34][35]. These searches rely on a good understanding of the QCD background for photon production.…”

Constraints from triple gauge couplings on vectorlike leptons

“…The charged couplings can be directly studied in future e + e − colliders, through e + e − → W + W − . The neutral couplings, on the other hand, can be studied using the processes e + e − → Z 0 γ or e + e − → Z 0 Z 0 , with subsequent decays Z 0 →νν and Z 0 → + − [34][35][36]. Let us note that only fermions with an axial coupling to the Z 0 boson can generate nonvanishing corrections to the neutral TGCs [33].…”