Artículos de revistas
Measurement of the shape of the boson-transverse momentum distribution in p(p)over-bar -> Z/gamma*-> e(+)e(-)+X events produced at root s=1.96 TeV
Fecha
2008-03-14Registro en:
Physical Review Letters. College Pk: Amer Physical Soc, v. 100, n. 10, p. 7, 2008.
0031-9007
10.1103/PhysRevLett.100.102002
WOS:000254024500013
WOS000254024500013.pdf
Autor
Joint Inst Nucl Res
Univ Buenos Aires
Centro Brasileiro de Pesquisas Físicas (CBPF)
Univ Estado Rio de Janeiro
Universidade Federal do ABC (UFABC)
Universidade Estadual Paulista (Unesp)
Univ Alberta
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Institución
Resumen
We present a measurement of the shape of the Z/gamma* boson transverse momentum (q(T)) distribution in p (p) over bar -> Z/gamma(*)-> e(+)e(-)+X events at a center-of-mass energy of 1.96 TeV using 0.98 fb(-1) of data collected with the D0 detector at the Fermilab Tevatron collider. The data are found to be consistent with the resummation prediction at low q(T), but above the perturbative QCD calculation in the region of q(T)> 30 GeV/c. Using events with q(T)< 30 GeV/c, we extract the value of g(2), one of the nonperturbative parameters for the resummation calculation. Data at large boson rapidity y are compared with the prediction of resummation and with alternative models that employ a resummed form factor with modifications in the small Bjorken x region of the proton wave function.