Author: Rachik Soualah
Publisher:
ISBN:
Category :
Languages : de
Pages : 141
Book Description
Production of neutral pions in PB+Au collisions at 158 AGeV-c
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.
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.
Pion Production Studies in Pb + Pb Collisions at 158 A GeV/c
Neutral Pion Production in Au+Au Collisions at Sqrt SNN
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The results of mid-rapidity (0
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The results of mid-rapidity (0
Neutral Pion and Η Meson Production in P-Pb Collisions at √sNN
Reconstruction of Charged Kaons in the Three Pion Decay Channel in Pb+Au 158 AGeV Collisions by the CERES Experiment
Particle Production in 158.A GeV 208Pb+208Pb Collisions
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 13
Book Description
The production of neutral pions in 158A GeV 2°8Pb+2°8Pb collisions has been studied in the WA98 experiment. The centrality dependence of the neutral pion production is investigated. An invariance of the spectral shape and a simple scaling of the yield with the number of participating nucleons is observed for centralities with more than about 50 participants. The transverse mass spectrum is analyzed in terms of a thermal model with hydrodynamic expansion. The high accuracy and large kinematic coverage of the measurement constrains the extracted freeze-out parameters, and provides information on the freeze-out velocity profile.
Publisher:
ISBN:
Category :
Languages : en
Pages : 13
Book Description
The production of neutral pions in 158A GeV 2°8Pb+2°8Pb collisions has been studied in the WA98 experiment. The centrality dependence of the neutral pion production is investigated. An invariance of the spectral shape and a simple scaling of the yield with the number of participating nucleons is observed for centralities with more than about 50 participants. The transverse mass spectrum is analyzed in terms of a thermal model with hydrodynamic expansion. The high accuracy and large kinematic coverage of the measurement constrains the extracted freeze-out parameters, and provides information on the freeze-out velocity profile.
Transverse Momentum Distributions of Neutral Pions from Sup 16 O + Au Collisions at 200 GeV/nucleon
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 5
Book Description
One means of studying the properties of the compressed and highly excited reaction zone is the investigation of {sub pT} spectra of produced pions and their dependence on the centrality of the reaction. To distinguish different contributing processes and to provide a reliable basis for comparisons with p + p scattering, a large {sub pT} coverage is required. In particular, data at high {sub pT} values, where hard processes become important and may be calculated by perturbative QCD are of interest. The present study of [pi]° spectra concentrates on measurements of {sub pT} spectra up to 2.8 GeV/c and on selections of the data according to the centrality of the reaction. 8 refs., 4 figs.
Publisher:
ISBN:
Category :
Languages : en
Pages : 5
Book Description
One means of studying the properties of the compressed and highly excited reaction zone is the investigation of {sub pT} spectra of produced pions and their dependence on the centrality of the reaction. To distinguish different contributing processes and to provide a reliable basis for comparisons with p + p scattering, a large {sub pT} coverage is required. In particular, data at high {sub pT} values, where hard processes become important and may be calculated by perturbative QCD are of interest. The present study of [pi]° spectra concentrates on measurements of {sub pT} spectra up to 2.8 GeV/c and on selections of the data according to the centrality of the reaction. 8 refs., 4 figs.
Proceedings Of The 29th International Conference On High Energy Physics: Ichep '98 (In 2 Volumes)
Author: Alan Astbury
Publisher: World Scientific
ISBN: 9814644919
Category : Science
Languages : en
Pages : 1899
Book Description
These proceedings consist of plenary rapporteur talks covering topics of major interest to the high energy physics community and parallel sessions papers which describe recent research results and future plans.
Publisher: World Scientific
ISBN: 9814644919
Category : Science
Languages : en
Pages : 1899
Book Description
These proceedings consist of plenary rapporteur talks covering topics of major interest to the high energy physics community and parallel sessions papers which describe recent research results and future plans.