Latest documents http://publikationen.ub.uni-frankfurt.de/index/index/ Mon, 10 Aug 2009 15:25:40 +0200 Mon, 10 Aug 2009 15:25:40 +0200 http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/7154 Recent results of the NA49 collaboration are presented. Transverse mass spectra as well as total multiplicities of identified particles are discussed. The study of their evolution from AGS over SPS to the highest RHIC energy reveals a couple of interesting features. These include a sudden change in the energy dependence of the mt-spectra and of the yields of strange hadrons around 30A GeV. Additionally, new results on particle production at high-pt for Pb+Pb collsions at 158A GeV, as well as on the v2 of L, are discussed. Christoph Blume; NA49 Collaboration article http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/7154 Thu, 08 Oct 2009 15:25:40 +0200 http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/3488 Results of resonance searches in the Xi - pi -, Xi - pi +, Xi -bar+ pi -, and Xi -bar+ pi + invariant mass spectra in proton-proton collisions at sqrt[s]=17.2 GeV are presented. Evidence is shown for the existence of a narrow Xi - pi - baryon resonance with mass of 1.862±0.002 GeV/c2 and width below the detector resolution of about 0.018 GeV/c2. The significance is estimated to be above 4.2 sigma . This state is a candidate for the hypothetical exotic Xi --3/2 baryon with S=-2, I=3 / 2, and a quark content of (dsdsu-bar). At the same mass, a peak is observed in the Xi - pi + spectrum which is a candidate for the Xi 03/2 member of this isospin quartet with a quark content of (dsusd-bar). The corresponding antibaryon spectra also show enhancements at the same invariant mass. Christopher Alt; L. Betev; Anja Billmeier; Christoph Blume; Roland Bramm; P. Buncic; Peter Dinkelaker; Dominik Bernhard Flierl; Marek Gazdzicki; Stefan Kniege; Thorsten Kollegger; Christine Meurer; Michael Kosta Mitrovski; R. Renfordt; Reinhard Stock; Herbert Ströbele; Alexander Albert Wetzler; Jacek Zaranek; et al.; NA49 Collaboration article http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/3488 Fri, 14 Oct 2005 17:29:24 +0200 http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/3844 The large acceptance and high momentum resolution as well as the significant particle identification capabilities of the NA49 experiment at the CERN SPS allow for a broad study of fluctuations and correlations in hadronic interactions. In the first part recent results on event-by-event charge and p_t fluctuations are presented. Charge fluctuations in central Pb+Pb reactions are investigated at three different beam energies (40, 80, and 158 AGeV), while for the p_t fluctuations the focus is put on the system size dependence at 158 AGeV. In the second part recent results on Bose Einstein correlations of h-h- pairs in minimum bias Pb+Pb reactions at 40 and 158 AGeV, as well as of K+K+ and K-K- pairs in central Pb+Pb collisions at 158 AGeV are shown. Additionally, other types of two particle correlations, namely pi p, Lambda p, and Lambda Lambda correlations, have been measured by the NA49 experiment. Finally, results on the energy and system size dependence of deuteron coalescence are discussed. Christoph Blume; NA49 Collaboration preprint http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/3844 Tue, 27 Sep 2005 08:47:27 +0200