TY - JOUR
T1 - Reconstructing a Z′ lagrangian using the LHC and low-energy data
AU - Ye, Li
AU - Petriello, Frank
AU - Quackenbush, Seth
N1 - Copyright:
Copyright 2009 Elsevier B.V., All rights reserved.
PY - 2009/9/10
Y1 - 2009/9/10
N2 - 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%.
AB - 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%.
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U2 - 10.1103/PhysRevD.80.055018
DO - 10.1103/PhysRevD.80.055018
M3 - Article
AN - SCOPUS:70349773309
VL - 80
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
SN - 1550-7998
IS - 5
M1 - 055018
ER -