CMS logoCMS event Hgg
Compact Muon Solenoid
LHC, CERN

CMS-SMP-12-004 ; CERN-PH-EP-2013-169
Rapidity distributions in exclusive Z + jet and photon + jet events in pp collisions at $\sqrt{s}$ = 7 TeV
Phys. Rev. D 88 (2013) 112009
Abstract: Rapidity distributions are presented for events containing either a Z boson or a photon with a single jet in proton-proton collisions produced at the CERN LHC. The data, collected with the CMS detector at $\sqrt{s}$ = 7 TeV, correspond to an integrated luminosity of 5.0 inverse femtobarns. The individual rapidity distributions of the boson and the jet are consistent within 5% with expectations from perturbative QCD. However, QCD predictions for the sum and the difference in rapidities of the two final-state objects show discrepancies with CMS data. In particular, next-to-leading-order QCD calculations, and two common Monte Carlo event generators using different methods to match matrix-element partons with parton showers, appear inconsistent with the data as well as with each other.
Figures CMS Publications
Figures

png pdf
Figure 1-a:

png pdf
Figure 1-b:

png pdf
Figure 1-c:

png pdf
Figure 1-d:

png pdf
Figure 2-a:

png pdf
Figure 2-b:

png pdf
Figure 2-c:

png pdf
Figure 2-d:
Compact Muon Solenoid
LHC, CERN