Most precise measurement of the Z+b-jets process
For the first time, the Z+b-jets process has been measured as a function of the b-jet multiplicity. In line with the spirit of CP3, the analysis benefited from direct interaction between experimentalists and phenomenologists, and members of CP3 have significantly contributed to this study, e.g. to the identification of b jets, as well as the background estimates using MadWeight. The CMS measurements are used to test various predictions from event generators, a.o. MadGraph and aMC@NLO, that both have been partially developed at CP3, and data favour the predictions in the five-flavour scheme, where b quarks are assumed massless. Furthermore, kinematic properties of the reconstructed particles in the Z+bb final state are tested, which is of interest for studies of the H-boson in the H->bb decay, as well as in searches for extensions of the Standard Model.
Reference url: http://link.springer.com/article/10.1007%2FJHEP06%282014%29120