Measurement of the Inclusive Z+Jet(s) Production Cross Section at CDF

Nuclear Physics B (Proc. Suppl.) 177–178 (2008) 312–313 www.elsevierphysics.com

CDF Run II Preliminary

jet

dσ/dpT [fb/(GeV/c)]

103

Z→ee + jets 66 < Mee < 116 GeV/c2 EeT > 25 GeV, |ηe1| < 1 |ηe2 | < 1 || 1.2 < |ηe2 | < 2.8 jet pjet T > 30 GeV/c, |y | < 2.1 ΔR(e,jet) > 0.7

2

10

10

Data L = 1.1 fb-1 Systematic uncertainties NLO MCFM CTEQ6.1M Corrected to hadron level μ20 = M2Z + p2T(Z), Rsep=1.3 μ = 2μ0 μ = μ0/2

1 10-1

PDF uncertainties

Data / Theory

10-2

1.4 1.2 1 0.8

CHAD

0.6 1.3

Parton-to-hadron level corrections Systematic uncertainties

1.2 1.1 1 30

0920-5632/$ – see front matter © 2007 Elsevier B.V. All rights reserved. doi:10.1016/j.nuclphysbps.2007.11.141

100

200

pjet [GeV/c] T

M. D’Onofrio et al. / Nuclear Physics B (Proc. Suppl.) 177–178 (2008) 312–313

σ × BR(Z→ee) [fb]

CDF Run II Preliminary -1

104

103

102

Ratio to LO

Data L = 1.1 fb Systematic uncertainties NLO MCFM CTEQ6.1M corrected to hadron level 2 μ20 = M2Z + pT (Z), Rsep =1.3 NLO scale μ = 2μ0 NLO scale μ = μ0/2 NLO PDF uncertainties LO MCFM hadron level

1.8 1.6

Z→ee + jets 66 < Mee < 116 GeV/c2 EeT > 25 GeV, |ηe1 | < 1 |ηe2 | < 1 || 1.2 < |ηe2 | < 2.8 jet pjet T > 30 GeV/c, |y | < 2.1 ΔR(e,jet) > 0.7 NLO MCFM w/o parton/hadron corrections

1.4 1.2 1 1

2

3

≥ Njets

313