First Measurement of the Angular Coefficients of Drell-Yan e+e- Pairs in the Z Mass Region from pp̅ Collisions at √s=1.96 TeV
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Aaltonen-2011-First Measurement of.pdf
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Author(s)
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Makhoul, Khaldoun
Paus, Christoph M. E.
Bauer, Gerry P
Date Issued
June 2011
Journal
Physical review letters
Publisher
American Physical Society
Citation
Aaltonen, T. et al. "First measurement of the angular coefficients of Drell-Yan e+e- pairs in the Z mass region from pp̅ collisions at √s=1.96 TeV" Phys. Rev. Lett., v.106, no.24 (241801) June 2011. © 2011 American Physical Society
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Final published version
Abstract
We report on the first measurement of the angular distributions of final state electrons in pp̅ →γ*/Z→e+e-+X [p p overstrike → gamma* / Z→e superscript + e superscript - + X] events produced in the Z boson mass region at √s=1.96 [square root of s=1.96] TeV. The data sample collected by the CDF II detector for this result corresponds to 2.1 fb-1 [fb superscript -1] of integrated luminosity. The angular distributions are studied as a function of the transverse momentum of the electron-positron pair and show good agreement with the Lam-Tung relation, consistent with a spin-1 description of the gluon, and demonstrate that, at high values of the transverse momentum, Z bosons are produced via quark-antiquark annihilation and quark-gluon Compton processes.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.106.241801
