Reconstructing a Z′ lagrangian using the LHC and low-energy data

Li Ye*, Frank Petriello, Seth Quackenbush

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


We study the potential of the LHC and future low-energy experiments to precisely measure the underlying model parameters of a new Z′ boson. We emphasize the complementary information obtained from both on- and off-peak LHC dilepton data, from the future Q-weak measurement of the weak charge of the proton, and from a proposed measurement of parity violation in low-energy Møller scattering. We demonstrate the importance of off-peak LHC data and Q-weak for removing sign degeneracies between Z′ couplings that occur if only on-peak LHC data is studied. A future precision measurement of low-energy Møller scattering can resolve a scaling degeneracy between quark and lepton couplings that remains after analyzing LHC dilepton data, permitting an extraction of the individual Z′ couplings rather than combinations of them. We study how precisely Z′ properties can be extracted for LHC integrated luminosities ranging from a few inverse femtobarns to super-LHC values of an inverse attobarn. For the several example cases studied with MZ′=1.5TeV, we find that coupling combinations can be determined with relative uncertainties reaching ±30% with 30fb-1 of integrated luminosity, while ±50% is possible with 10fb-1. With SLHC luminosities of 1ab-1, we find that products of quark and lepton couplings can be probed to ±10%.

Original languageEnglish (US)
Article number055018
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number5
StatePublished - Sep 10 2009

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)


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