Questa è una vecchia versione del documento!

http://cms.cern.ch/cds/FWD-11-002

The paper presents clearly a nice and really important measurement. It provides details on the method and explanation on why the measurement is relevant.

The figures are relevant and clearly presented.

There are two main points we would like to see addressed

1) The English is not as fluent as we would like. Sentences are very long, with a lot of sub-structure. This makes the paper difficult to read. We suggest a revision.

2) In the last section, the paper presents the pt spectra for the fwd and central jets, and presents the fact that models do not reproduce them. It would be nice to go one step further and plot the 2D distribution of the pt of the two jets, to see what are the correlations in the data and in the model.

We congratulate with the authors for this nice work.