CMS-PAS-HIN-13-001

CMS-PAS-HIN-13-001
Study of dijet momentum balance and pseudorapidity distributions in pPb collisions at $\sqrt{s_{_{\rm NN}}}= 5.02$ TeV
CMS Collaboration
2013

Abstract: Results on dijet production in \mbox{pPb} collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV are presented. A data sample corresponding to an integrated luminosity of 18.48\,nb $^{-1}$ collected with the CMS detector at the LHC is analyzed. Jets are reconstructed with the anti- $k_\text{T}$ algorithm, using combined information from tracking and calorimetry. The dijet momentum balance, azimuthal angle correlations and pseudorapidity distributions are studied as a function of forward calorimeter transverse energy and compared to results from {\sc pythia} reference calculations representing \mbox{pp} collisions. For \mbox{pPb} collisions, the dijet momentum ratio $p_{\mathrm{T},2}/p_{\mathrm{T},1}$ and the width of the azimuthal angle difference distribution is remarkably insensitive to the forward activity of the collision, and comparable to the same quantity obtained from the simulated \mbox{pp} reference. The pseudorapidity of the dijet system changes monotonically with increasing forward calorimeter activity in the direction expected from gluon saturation.
Links: CDS record (PDF) ; inSPIRE record ; Public twiki page ; CADI line (restricted) ; These preliminary results are superseded in this paper, EPJC 74 (2014) 2951. The superseded preliminary plots can be found here.

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