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SUMMARY:Pseudorapidity dependence of charged hadron multiplicity and trans
 verse energy densities in PbPb collisions from CMS
DTSTART;VALUE=DATE-TIME:20110523T134000Z
DTEND;VALUE=DATE-TIME:20110523T140000Z
DTSTAMP;VALUE=DATE-TIME:20130522T160417Z
UID:indico-contribution-438@cern.ch
DESCRIPTION:Speakers: KRAJCZAR\, Krisztian (KFKI Research Institute for Pa
 rticle and Nuclear Physics of the Hungarian Academy of Sciences)\nThe pseu
 dorapidity and centrality dependence of transverse energy and charged part
 icle multiplicities offers insight into the properties of the matter produ
 ced in the collisions of ultra-relativistic heavy nuclei. Multiplicities a
 s a function of center-of-mass energy and collision centrality are importa
 nt for exploring the role of hard and soft scattering in particle producti
 on and for looking at novel effects in nucleus-nucleus collisions (e.g. sc
 aling\, saturation).\n\nMeasurements of the charged hadron multiplicity an
 d transverse energy are presented for minimum bias PbPb collisions at a ce
 nter-of-mass energy of 2.76 TeV per nucleon pair. The number of charged ha
 drons was obtained by two different methods based on the inner silicon pix
 el system of the CMS detector at the LHC. One technique involved counting 
 the number of reconstructed single particle hits in the pixel detector\, w
 hile the other formed hit pairs ('tracklets') from the different detector 
 layers. The two methods are in excellent agreement. For the transverse ene
 rgy measurement\, CMS has almost hermetic calorimetry coverage with fine g
 ranularity and excellent resolution. In addition for particles near centra
 l rapidity momenta from the tracker can be combined with the calorimeter d
 ata to give a significant improvement of the system resolution. The measur
 ements is compared with heavy-ion results from earlier experiments\, where
  a smooth dependence on the collision energy is observed. The results as a
  function of centrality are compared to the corresponding value in pp coll
 isions interpolated from existing CMS measurements\n\nhttp://indico.cern.c
 h/contributionDisplay.py?contribId=438&sessionId=45&confId=30248
LOCATION:Imperial Palace  Salle de l'Europe
URL:http://indico.cern.ch/contributionDisplay.py?contribId=438&sessionId=4
 5&confId=30248
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