Spin and model identification of Z{sup '} bosons at the LHC
- Department of Physics and Technology, University of Bergen, Postboks 7803, N-5020 Bergen (Norway)
Heavy resonances appearing in the clean Drell-Yan channel may be the first new physics to be observed at the proton-proton CERN LHC. If a new resonance is discovered at the LHC as a peak in the dilepton invariant mass distribution, the characterization of its spin and couplings will proceed via measuring production rates and angular distributions of the decay products. We discuss the discrimination of the spin-1 of Z{sup '} representative models (Z{sub SSM}{sup '}, Z{sub {psi}}{sup '}, Z{sub {eta}}{sup '}, Z{sub {chi}}{sup '}, Z{sub LR}{sup '}, and Z{sub ALR}{sup '}) against the Randall-Sundrum graviton resonance (spin-2) and a spin-0 resonance (sneutrino) with the same mass and producing the same number of events under the observed peak. To assess the range of the Z{sup '} mass where the spin determination can be performed to a given confidence level, we focus on the angular distributions of the Drell-Yan leptons, in particular, we use as a basic observable an angular-integrated center-edge asymmetry, A{sub CE}. The spin of a heavy Z{sup '} gauge boson can be established with A{sub CE} up to M{sub Z{sup '}}{approx_equal}3.0 TeV, for an integrated luminosity of 100 fb{sup -1}, or minimal number of events around 110. We also examine the distinguishability of the considered Z{sup '} models from one another, once the spin-1 has been established, using the total dilepton production cross section. With some assumption, one might be able to distinguish among these Z{sup '} models at 95% C.L. up to M{sub Z{sup '}}{approx_equal}2.1 TeV.
- OSTI ID:
- 21300893
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 79, Issue 11; Other Information: DOI: 10.1103/PhysRevD.79.115021; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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