Improved Constraints on the Heavy Gauge Bosons Decaying to Pairs of Electroweak Bosons by Using the Expected Run 3 Data and HL-LHC Options

Abstract

The expected ATLAS Run 3 data set with time-integrated luminosity of 300 fb−1 and HL-LHC options at the LHC in the diboson channels are used to probe a simple benchmark model with an extended gauge sector, proposed by Altarelli et al. This model accommodates new charged W ′ and neutral Z′ vector bosons with modi ed trilinear Standard Model gauge couplings, decaying into electroweak gauge boson pairs W Z or W W , where W /Z decay semileptonically. Also presented, from a similar analysis of W ′ and Z′ bosons arising in the EGM, which can decay through W ′ → `ν and Z′ → ll , are limits on the W -W ′ and Z-Z′ mixing parameters and the W ′ and Z′ vector boson masses. We present upper limits on the mixing parameters, Z − Z′ and W − W ′, by using the expected Run 3 data and HL LHC options.