Centrality and pseudorapidity dependence of the transverse energy density in pPb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV

Abstract

The almost hermetic coverage of the CMS detector is used to measure the distribution of transverse energy, $E_{\mathrm{T}}$, over 13.2 units of pseudorapidity, $\eta$, for pPb collisions at a center-of-mass energy per nucleon pair of $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV. The huge angular acceptance exploits the fact that the CASTOR calorimeter at $-6.6$ $<$ $\eta$ $<$ $-5.2$ is effectively present on both sides of the colliding system because of a switch in the proton-going and lead-going beam directions. This wide acceptance enables the study of correlations between well-separated angular regions and makes the measurement a particularly powerful test of event generators. For minimum bias pPb collisions the maximum value of d$E_{\mathrm{T}}/$d$\eta$ is 22 GeV, which implies an $E_{\mathrm{T}}$ per participant nucleon pair comparable to that of peripheral PbPb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 2.76 TeV. The increase of d$E_{\mathrm{T}}/$d$\eta$ with centrality is much stronger for the lead-going side than for the proton-going side. The $\eta$ dependence of d$E_{\mathrm{T}}/$d$\eta$ is sensitive to the $\eta$ range in which the centrality variable is defined. Several modern generators are compared to these results but none is able to capture all aspects of the $\eta$ and centrality dependence of the data and the correlations observed between different $\eta$ regions.

arXiv commentReplaced with the published version. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-14-014 (CMS Public Pages)

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