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Measurement of the centrality dependence of the charged particle pseudorapidity distribution in lead-lead collisions at root s(NN)=2.76 TeV with the ATLAS detector
KTH, Skolan för teknikvetenskap (SCI), Fysik, Partikel- och astropartikelfysik.
KTH, Skolan för teknikvetenskap (SCI), Fysik, Partikel- och astropartikelfysik.ORCID-id: 0000-0002-8913-0981
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2012 (Engelska)Ingår i: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 710, nr 3, s. 363-382Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The ATLAS experiment at the LHC has measured the centrality dependence of charged particle pseudorapidity distributions over vertical bar eta vertical bar < 2 in lead-lead collisions at a nucleon-nucleon centre-of-mass energy of root s(NN) = 2.76 TeV. In order to include particles with transverse momentum as low as 30 MeV, the data were recorded with the central solenoid magnet off. Charged particles were reconstructed with two algorithms (2-point "tracklets" and full tracks) using information from the pixel detector only. The lead-lead collision centrality was characterized by the total transverse energy in the forward calorimeter in the range 3.2 < vertical bar eta vertical bar< 4.9. Measurements are presented of the per-event charged particle pseudorapidity distribution, dN(ch)/d eta, and the average charged particle multiplicity in the pseudorapidity interval vertical bar eta vertical bar < 0.5 in several intervals of collision centrality. The results are compared to previous mid-rapidity measurements at the LHC and RHIC. The variation of the mid-rapidity charged particle yield per colliding nucleon pair with the number of participants is consistent with lower root s(NN) results. The shape of the dN(ch)/d eta distribution is found to be independent of centrality within the systematic uncertainties of the measurement.

Ort, förlag, år, upplaga, sidor
2012. Vol. 710, nr 3, s. 363-382
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URN: urn:nbn:se:kth:diva-101085DOI: 10.1016/j.physletb.2012.02.045ISI: 000303081900001Scopus ID: 2-s2.0-84862813169OAI: oai:DiVA.org:kth-101085DiVA, id: diva2:546344
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QC 20120823

Tillgänglig från: 2012-08-23 Skapad: 2012-08-23 Senast uppdaterad: 2017-12-07Bibliografiskt granskad

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Strandberg, Jonas

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Lund-Jensen, BengtStrandberg, Jonas
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Partikel- och astropartikelfysik
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Physics Letters B
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