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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

Author(s)
Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Makhoul, Khaldoun; Paus, Christoph M. E.; Bauer, Gerry P
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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.
Date issued
2011-06
URI
http://hdl.handle.net/1721.1/65191
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
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
Version: Final published version
ISSN
0031-9007

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