Pub Date : 2005-10-01DOI: 10.1556/APH.24.2005.1-4.34
F. Duraes, F. Navarra, M. Nielsen
The J/ψπ → ]]> ]]> ]]> ]]> ]]> bar{rm D}{rm D}^*$, D$bar{rm D}^*$, $bar{rm D}$D and $bar{rm D}^*$D$^*$ cross sections as a function of √{s} are evaluated in a QCD sum rule calculation. We find that our results are compatible with the J/ψπ → charmed mesons cross sections obtained with models based on meson exchange if a cut-off of order of 1 GeV is used.
{"title":"Higher Twist Corrections to the J/ψ–π Cross Section","authors":"F. Duraes, F. Navarra, M. Nielsen","doi":"10.1556/APH.24.2005.1-4.34","DOIUrl":"https://doi.org/10.1556/APH.24.2005.1-4.34","url":null,"abstract":"The J/ψπ → ]]> ]]> ]]> ]]> ]]> bar{rm D}{rm D}^*$, D$bar{rm D}^*$, $bar{rm D}$D and $bar{rm D}^*$D$^*$ cross sections as a function of √{s} are evaluated in a QCD sum rule calculation. We find that our results are compatible with the J/ψπ → charmed mesons cross sections obtained with models based on meson exchange if a cut-off of order of 1 GeV is used.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"75 1","pages":"247-252"},"PeriodicalIF":0.0,"publicationDate":"2005-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74656645","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2005-10-01DOI: 10.1556/APH.24.2005.1-4.21
H. Oeschler
A review of strange particle production in heavy ion collisions at incident energies from SIS up to 40 A·GeV is presented. A statistical model assuming chemical equilibrium and local strangeness conservation (i.e. strangeness conservation per collision) describes most of the observed features. It is demonstrated that the K- production at SIS energies occurs predominantly via strangeness exchange and that this channel is approaching chemical equilibrium. The observed maximum in the K+/π+ excitation function is also seen in the ratio of strange to non-strange particle production. The appearance of this maximum around 30 A·GeV is due to the energy dependence of the chemical freeze-out parameters temperature T and baryo-chemical potential μB.
{"title":"Strange Particle Production from SIS up to 40 A·GeV","authors":"H. Oeschler","doi":"10.1556/APH.24.2005.1-4.21","DOIUrl":"https://doi.org/10.1556/APH.24.2005.1-4.21","url":null,"abstract":"A review of strange particle production in heavy ion collisions at incident energies from SIS up to 40 A·GeV is presented. A statistical model assuming chemical equilibrium and local strangeness conservation (i.e. strangeness conservation per collision) describes most of the observed features. It is demonstrated that the K- production at SIS energies occurs predominantly via strangeness exchange and that this channel is approaching chemical equilibrium. The observed maximum in the K+/π+ excitation function is also seen in the ratio of strange to non-strange particle production. The appearance of this maximum around 30 A·GeV is due to the energy dependence of the chemical freeze-out parameters temperature T and baryo-chemical potential μB.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"17 1","pages":"145-156"},"PeriodicalIF":0.0,"publicationDate":"2005-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82237681","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2005-10-01DOI: 10.1556/APH.24.2005.1-4.35
R. Azevedo, F. Navarra, M. Nielsen
A meson-exchange model, based on effective Lagrangians including anomalous parity interactions, is used to calculate the cross section for the dissociation of J/ψ by pions. Off-shell effects at the vertices are included with QCD sum rule estimates for the coupling constants and form factors. The total J/ψ–π cross section was found to be 10–11 mb for 4.2 ≤ √{s} ≤ 5 GeV.
{"title":"Hadronic Form Factors and J/ψ Dissociation","authors":"R. Azevedo, F. Navarra, M. Nielsen","doi":"10.1556/APH.24.2005.1-4.35","DOIUrl":"https://doi.org/10.1556/APH.24.2005.1-4.35","url":null,"abstract":"A meson-exchange model, based on effective Lagrangians including anomalous parity interactions, is used to calculate the cross section for the dissociation of J/ψ by pions. Off-shell effects at the vertices are included with QCD sum rule estimates for the coupling constants and form factors. The total J/ψ–π cross section was found to be 10–11 mb for 4.2 ≤ √{s} ≤ 5 GeV.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"67 1","pages":"253-258"},"PeriodicalIF":0.0,"publicationDate":"2005-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75127238","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2005-10-01DOI: 10.1556/APH.24.2005.1-4.17
S. Pratt, S. Pal
Spectra and correlations from RHIC are analyzed to determine the phase space density and total entropy. The phase space density for pions is higher and the entropy is thus lower than some expectations, but there seems to be enough entropy carried by other species, especially baryons, to roughly match the total entropy expected from lattice gauge calculations.
{"title":"Entropy and Phase Space Density at RHIC","authors":"S. Pratt, S. Pal","doi":"10.1556/APH.24.2005.1-4.17","DOIUrl":"https://doi.org/10.1556/APH.24.2005.1-4.17","url":null,"abstract":"Spectra and correlations from RHIC are analyzed to determine the phase space density and total entropy. The phase space density for pions is higher and the entropy is thus lower than some expectations, but there seems to be enough entropy carried by other species, especially baryons, to roughly match the total entropy expected from lattice gauge calculations.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"173 1","pages":"119-124"},"PeriodicalIF":0.0,"publicationDate":"2005-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84009644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2005-05-01DOI: 10.1556/APH.24.2005.1-4.31
C. Nonaka, R. Fries, B. Müller, S. Bass, M. Asakawa
We discuss the hadron production in heavy ion collisions by the recombination and fragmentation model. We propose the elliptic flow as the useful tool for exploring final interactions for resonances, hadron structure for exotic particles and phase structure.
{"title":"Hadronization at Rhic: Interplay of Recombination and Fragmentation","authors":"C. Nonaka, R. Fries, B. Müller, S. Bass, M. Asakawa","doi":"10.1556/APH.24.2005.1-4.31","DOIUrl":"https://doi.org/10.1556/APH.24.2005.1-4.31","url":null,"abstract":"We discuss the hadron production in heavy ion collisions by the recombination and fragmentation model. We propose the elliptic flow as the useful tool for exploring final interactions for resonances, hadron structure for exotic particles and phase structure.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"18 1","pages":"227-233"},"PeriodicalIF":0.0,"publicationDate":"2005-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84842358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2004-06-22DOI: 10.1556/APH.24.2005.1-4.36
M. Tannenbaum, Collaboration Phenix
Measurements using the finely segmented EM Calorimeter in PHENIX are presented. The issue of whether these are sufficient to claim discovery of the Quark–Gluon Plasma is discussed.
测量使用精细分割EM量热计在PHENIX提出。讨论了这些是否足以证明夸克-胶子等离子体的发现。
{"title":"Can the QGP Be Found Using Only an Electromagnetic Calorimeter","authors":"M. Tannenbaum, Collaboration Phenix","doi":"10.1556/APH.24.2005.1-4.36","DOIUrl":"https://doi.org/10.1556/APH.24.2005.1-4.36","url":null,"abstract":"Measurements using the finely segmented EM Calorimeter in PHENIX are presented. The issue of whether these are sufficient to claim discovery of the Quark–Gluon Plasma is discussed.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"29 1","pages":"259-267"},"PeriodicalIF":0.0,"publicationDate":"2004-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84917946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2004-06-08DOI: 10.1556/APH.24.2005.1-4.22
M. Mitrovski
New experimental results of NA49 on hyperon production in central Pb+Pb collisions at the SPS energies are presented. In particular, measurements of Λ production at 30 A·GeV and Ξ and Ω production at 40 A·GeV are shown. Transverse mass spectra and rapidity distributions of hyperons at different energies are compared. The energy dependence of the particle yields and ratios is discussed.
{"title":"Hyperon Production at CERN SPS Energies","authors":"M. Mitrovski","doi":"10.1556/APH.24.2005.1-4.22","DOIUrl":"https://doi.org/10.1556/APH.24.2005.1-4.22","url":null,"abstract":"New experimental results of NA49 on hyperon production in central Pb+Pb collisions at the SPS energies are presented. In particular, measurements of Λ production at 30 A·GeV and Ξ and Ω production at 40 A·GeV are shown. Transverse mass spectra and rapidity distributions of hyperons at different energies are compared. The energy dependence of the particle yields and ratios is discussed.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"2 1","pages":"157-166"},"PeriodicalIF":0.0,"publicationDate":"2004-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89873835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2004-05-26DOI: 10.1556/APH.24.2005.1-4.27
S. Manly
This paper reviews recent results on directed and elliptic flow from the PHOBOS experiment using data taken during Au+Au runs at RHIC. The systematic dependence of flow on pseudorapidity, energy, transverse momentum and centrality is discussed.
{"title":"Collective Flow with PHOBOS","authors":"S. Manly","doi":"10.1556/APH.24.2005.1-4.27","DOIUrl":"https://doi.org/10.1556/APH.24.2005.1-4.27","url":null,"abstract":"This paper reviews recent results on directed and elliptic flow from the PHOBOS experiment using data taken during Au+Au runs at RHIC. The systematic dependence of flow on pseudorapidity, energy, transverse momentum and centrality is discussed.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"126 1","pages":"203-208"},"PeriodicalIF":0.0,"publicationDate":"2004-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79521845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2004-05-19DOI: 10.1556/APH.24.2005.1-4.29
S. Esumi
Directed and elliptic event anisotropy parameters measured in the experiments at relativistic heavy-ion collider are presented. The possible origin of the measured elliptic anisotropy parameter v2 and its sensitivity to the early phase of the high-energy heavy-ion collisions are discussed.
{"title":"Azimuthal Anisotropy in High-Energy Heavy-Ion Collisions at RHIC Energies","authors":"S. Esumi","doi":"10.1556/APH.24.2005.1-4.29","DOIUrl":"https://doi.org/10.1556/APH.24.2005.1-4.29","url":null,"abstract":"Directed and elliptic event anisotropy parameters measured in the experiments at relativistic heavy-ion collider are presented. The possible origin of the measured elliptic anisotropy parameter v2 and its sensitivity to the early phase of the high-energy heavy-ion collisions are discussed.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"271 1","pages":"215-220"},"PeriodicalIF":0.0,"publicationDate":"2004-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83025983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2004-05-14DOI: 10.1556/APH.24.2005.1-4.5
C. Blume, Collaboration NA49
In this contribution the energy dependence of various hadronic observables as measured by the NA49 experiment in the beam energy range between 20 and 158 AGeV is presented. These include mt and rapidity distributions, particle ratio fluctuations, as well as HBT radii. The data are put in the context of results from the AGS and RHIC.
{"title":"Energy Dependence of Hadronic Observables in Central Pb+Pb Reactions at the CERN SPS","authors":"C. Blume, Collaboration NA49","doi":"10.1556/APH.24.2005.1-4.5","DOIUrl":"https://doi.org/10.1556/APH.24.2005.1-4.5","url":null,"abstract":"In this contribution the energy dependence of various hadronic observables as measured by the NA49 experiment in the beam energy range between 20 and 158 AGeV is presented. These include mt and rapidity distributions, particle ratio fluctuations, as well as HBT radii. The data are put in the context of results from the AGS and RHIC.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"39 1","pages":"31-37"},"PeriodicalIF":0.0,"publicationDate":"2004-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81013932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：