Centrality and pseudorapidity dependence of the transverse energy density in pPb collisions at √sNN = 5.02 TeV

Sirunyan A.M. et al.Tumasyan, A.A.TumasyanAdam, W.W.AdamAmbrogi, F.F.AmbrogiAsilar, E.E.AsilarBergauer, T.T.BergauerBrandstetter, J.J.BrandstetterBrondolin, E.E.BrondolinDragicevic, M.M.DragicevicErö, J.J.EröDel Valle, A.E.A.E.Del ValleFlechl, M.M.FlechlFrühwirth, R.R.FrühwirthGhete, V.M.V.M.GheteHrubec, J.J.HrubecJeitler, M.M.JeitlerKrammer, N.N.KrammerKrätschmer, I.I.KrätschmerLiko, D.D.LikoMadlener, T.T.MadlenerMikulec, I.I.MikulecPAO-TI CHANG KAI-FENG CHEN WEI-SHU HOU RONG-SHYANG LU Stathes Paganis2021-07-282021-07-28201924699985https://www.scopus.com/inward/record.uri?eid=2-s2.0-85071933340&doi=10.1103%2fPhysRevC.100.024902&partnerID=40&md5=990b366bbc2dc999c66d8315d9a77408https://scholars.lib.ntu.edu.tw/handle/123456789/574895The almost hermetic coverage of the CMS detector is used to measure the distribution of transverse energy, ET, over 13.2 units of pseudorapidity, η, for pPb collisions at a center-of-mass energy per nucleon pair of √sNN=5.02 TeV. The huge angular acceptance exploits the fact that the CASTOR calorimeter at -6.6 < η < -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 dET/dη is 22 GeV, which implies an ET per participant nucleon pair comparable to that of peripheral PbPb collisions at √sNN= 2.76 TeV. The increase of dET/dη with centrality is much stronger for the lead-going side than for the proton-going side. The η dependence of dET/dη is sensitive to the η 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 η and centrality dependence of the data and the correlations observed between different η regions. ? 2019 CERN, for the CMS Collaboration.Centrality and pseudorapidity dependence of the transverse energy density in pPb collisions at √sNN = 5.02 TeVjournal article10.1103/PhysRevC.100.0249022-s2.0-85071933340