Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 58
Book Description
Three Pion Interferometry in Sulphur-lead Collisions at 200 GeV Per Nucleon in NA44
Author: Neutral Pion Production in Nucleus-nucleus Collisions at 158 and 200 GeV/nucleon
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 11
Book Description
Two years ago, at the 12th Winter Workshop on Nuclear Dynamics held here in Snowbird, the authors presented WA80 limits on direct photon production in 200-GeV 32S + Au collisions. It was found that the results were consistent (within 1[sigma]) with the absence of an excess of photons over those that can be accounted for by the two-photon decay branches of [pi]° and [eta] mesons and by the small photon contributions from other radiative decays. They are in the process of finalizing the direct-photon production results from collisions of lead nuclei at 158 GeV/nucleon. The author briefly discusses the status of the analysis and gives some preliminary results at the end of this talk. However, most of this presentation is concerned with a very different aspect of the photon measurements: distributions of neutral pions. In contrast to direct photons which probe initial collision conditions, hadrons, such as neutral pions, interact strongly and decouple late in the reaction evolution and, thus, provide information concerning the system at freeze out. Transverse momentum spectra at low and intermediate p{sub T} relate to thermodynamic and hydrodynamic descriptions of the hot, dense systems. In addition, the high-p{sub T} region reflects the hard-scattering regime and may help one understand initial-state particle production by forming a bridge to proton-proton and proton-nucleus results. It follows that it is essential that the [pi]° measurements cover a large p{sub T} range.
Three Pion Correlations in Relativistic Heavy Ion Collisions
Author: Yiming LiuPublisher:
ISBN:
Category : Heavy ion collisions
Languages : en
Pages : 342
Book Description
Kaon and Pion Interferometry. Final Report
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 4
Book Description
Both NA44 and EOS continue to publish high quality data on relativistic heavy ion collisions. The next leap in energy will be provided by BRAHMS at RHIC. Experiment NA44 has measured particle correlations of [pi]{sup {+-}}, K and protons and single particle distributions of [pi]{sup {+-}}, K{sup {+-}}, p, {anti p}, d and {anti d} for pA, SA and PbPb collisions at 450GeV/c, 200A·GeV and 158A·GeV for the p, S and Pb beams respectively. When the spectra are fitted to an exponential in m{sub T}, the inverse slopes increase as the system gets heavier and with increasing particle mass. For larger systems the baryon density at mid-rapidity increases implying more secondary collisions. These fuel a collective expansion and a boost in transverse momentum proportional to the mass as seen in the data. The EOS collaboration has continued to publish results from their large data set of heavy ion collisions at the BEVALAC. They plan to study the energy dependence of coalescence and flow by comparing results from NA44 and EOS.
Spectra of Pions and Protons in Nuclear Collisions at 200 GeV-nucleon
Author: Blevis IraPion Interferometry in Au+Au and Cu+Cu Collisions at Sqrt SNN
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
We present a systematic analysis of two-pion interferometry in Au+Au collisions at (square root)sNN = 62.4 GeV and Cu+Cu collisions at (square root)sNN = 62.4 and 200 GeV using the STAR detector at RHIC. The multiplicity and transverse momentum dependences of the extracted correlation lengths (radii) are studied. The scaling with charged particle multiplicity of the apparent system volume at final interaction is studied for the RHIC energy domain. The multiplicity scaling of the measured correlation radii is found to be independent of colliding system and collision energy.
Physics Briefs
Author: Introduction to Relativistic Heavy Ion Physics
Author: Jerzy BartkePublisher: World Scientific
ISBN: 9810212313
Category : Science
Languages : en
Pages : 239
Book Description
This book attempts to cover the fascinating field of physics of relativistic heavy ions, mainly from the experimentalist's point of view. After the introductory chapter on quantum chromodynamics, basic properties of atomic nuclei, sources of relativistic nuclei, and typical detector set-ups are described in three subsequent chapters. Experimental facts on collisions of relativistic heavy ions are systematically presented in 15 consecutive chapters, starting from the simplest features like cross sections, multiplicities, and spectra of secondary particles and going to more involved characteristics like correlations, various relatively rare processes, and newly discovered features: collective flow, high pT suppression and jet quenching. Some entirely new topics are included, such as the difference between neutron and proton radii in nuclei, heavy hypernuclei, and electromagnetic effects on secondary particle spectra.Phenomenological approaches and related simple models are discussed in parallel with the presentation of experimental data. Near the end of the book, recent ideas about the new state of matter created in collisions of ultrarelativistic nuclei are discussed. In the final chapter, some predictions are given for nuclear collisions in the Large Hadron Collider (LHC), now in construction at the site of the European Organization for Nuclear Research (CERN), Geneva. Finally, the appendix gives us basic notions of relativistic kinematics, and lists the main international conferences related to this field. A concise reference book on physics of relativistic heavy ions, it shows the present status of this field.
Dissertation Abstracts International
Author: Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 874
Book Description
Current Experiments in Elementary Particle Physics
Author: Publisher:
ISBN:
Category : Particles (Nuclear physics)
Languages : en
Pages : 179
Book Description