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Title
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Measurement of the pseudorapidity and centrality dependence of in PbPb collisions at = 2.76 TeV extending into the very forward phase-space
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Author
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Institution/Organisation
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CMS Collaboration
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Abstract
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| The energy density, dE/dh, in PbPb collisions at 2.76 A TeV nucleus-nucleus centerof- mass energy is measured as a function of pseudorapidity, h, and collision centrality using the CMS detector at the LHC. The very large pseudorapidity coverage of this measurement is used as a powerful constraint for various hadronic interaction models. The CASTOR calorimeter extends the h coverage of CMS up to jhj = 6.6, which is only 1.4 units away from the beam rapidity for psNN = 2.76 TeV. This is comparable to the most forward measurements at RHIC. A comparison of the centrality dependence of the very forward energy density to that at smaller pseudorapidities is presented and compared to event generator predictions of models for nuclear collisions. The very wide pseudorapidity range of the presented measurement is unique at this center-of-mass energy and the average energy weighted pseudorapidity can be estimated, which is a useful observable to discriminate between model predictions. |
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Language
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English
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Source (series)
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CMS physics analysis summary ; CMS PAS HIN-12-006
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Publication
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S.l.
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2012
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Volume/pages
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21 p.
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