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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

AuthorsAaltonen, T.; Álvarez González, B.; Casal, Bruno ; Cuevas, Javier ; Gómez, G. ; Palencia, Enrique ; Rodrigo, Teresa ; Ruiz Jimeno, Alberto ; Scodellaro, Luca ; Vila, Iván ; Vilar, Rocío
Issue DateJun-2011
PublisherAmerican Physical Society
CitationPhysical Review Letters 106(24): 241801 (2011)
AbstractWe report on the first measurement of the angular distributions of final state electrons in pp̅ →γ*/Z→e+e-+X events produced in the Z boson mass region at √s=1.96  TeV. The data sample collected by the CDF II detector for this result corresponds to 2.1  fb-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.
Description8 páginas, 3 figuras, 1 tabla.-- PACS numbers: 13.38.Dg, 12.38.Bx, 13.85.Qk, 14.70.Hp.-- CDF Collaboration: et al.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevLett.106.241801
Appears in Collections:(IFCA) Artículos
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