The 2nd international conference on particle physics and astrophysics

Study of LHC experiments sensitivity to anomalous quartic gauge couplings in $Z\gamma\gamma$ production during Run2

10 Oct 2016, 15:15

30m

Hall of the 2nd floor (Milan Hotel)

Poster Nuclear physics and particle physics Poster session - I

Description

Run2 sensitivity to quartic anomalous gauge couplings was estimated for ATLAS experiment at LHC with increased energy of proton-proton collisions $\sqrt{s} = 13$ TeV and expected 40 fb$^{-1}$ (2016) and 100 fb$^{-1}$ (2016-2017) of integral luminosity. Simulation of $Z\gamma\gamma$ process with anomalous $ZZ\gamma\gamma$ and $Z\gamma\gamma\gamma$ couplings was performed using VBFNLO MC generator. Differential distributions on four body invariant mass of final state particles was used for extraction of expected limits on Effective Field Theory parameters $f_{T0}/\Lambda^{4}, f_{T5}/\Lambda^{4}, f_{T9}/\Lambda^{4}, f_{M2}/\Lambda^{4}, f_{M3}/\Lambda^{4}$. Combined limits are obtained from two charged leptonic decay channels of Z boson ($Z\gamma\gamma\rightarrow l^{+}l^{−}\gamma\gamma$, where $l = e$ or $\mu$). Unitarity of expected limits was studied using dipole form factor.