CPOD International Workshop at GSI Darmstadt
July 9 - 13, 2007 -
Registered Participants Information

Title:	Mr.
Last Name:	Lungwitz
First Name:	Benjamin
E-Mail:	lungwitzikf.uni-frankfurt.de
Affiliation for Badge:	Universität Frankfurt
Institute:	IKF Universitaet Frankfurt
Address (Street):	Max-von-Laue Strasse 1
Postal Code, City:	60438 Frankfurt
Country:	Germany
Phone:	+496979847043
Fax:
Arrival Date:	July 9
Departure Date:	July 13
Hotel Information:	Others...
Payment:	Cash at the conference site
Contribution
Author(s):	Benjamin Lungwitz for the NA49 Collaboration
Institute(s):	IKF Universitaet Frankfurt
Title:	Energy, Rapidity and Transverse Momentum Dependence of Multiplicity Fluctuations in Heavy Ion Collisions at CERN SPS
Abstract:	The energy dependence of multiplicity fluctuations was studied for the most central Pb + Pb collisions at 20A, 30A, 40A, 80A and 158A GeV by the NA49 experiment at the CERN SPS. The multiplicity distribution for negatively and positively charged hadrons at forward rapidities is significantly narrower than Poisson one for all energies. No significant structure in energy dependence of the scaled variance of multiplicity fluctuations is observed. The measured scaled variance is lower than the one predicted by the grand-canonical formulation of the hadron-resonance gas model. This can be attributed to a suppression of fluctuations due to conservation laws. The rapidity and transverse momentum dependence of scaled variance show smaller fluctuations for larger rapidities and transverse momenta, which can be explained qualitatively by energy and momentum conservation. The results for scaled variance are in approximate agreement with the string-hadronic model UrQMD.