Pub Date : 2005-10-13DOI: 10.1556/APH.27.2006.2-3.46
David A. Brown, R. Vogt
We propose to develop a high-energy heavy-ion experimental database and make it accessible to the scientific community through an on-line interface. This database will be searchable and cross-indexed with relevant publications, including published detector descriptions. Since this database will be a community resource, it requires the high-energy nuclear physics community’s financial and manpower support. This database should eventually contain all published data from the Bevalac, AGS and SPS to RHIC and LHC energies, proton-proton to nucleus-nucleus collisions as well as other relevant systems, and all measured observables. Such a database would have tremendous scientific payoff as it makes systematic studies easier and allows simpler benchmarking of theoretical models to a broad range of old and new experiments. Furthermore, there is a growing need for compilations of high-energy nuclear data for applications including stockpile stewardship, technology development for inertial confinement fusion and target and source development for upcoming facilities such as the Next Linear Collider. To enhance the utility of this database, we propose periodically performing evaluations of the data and summarizing the results in topical reviews.
我们建议建立一个高能重离子实验数据库，并通过在线界面向科学界开放。该数据库将可与相关出版物进行检索和交叉索引，包括已发表的探测器描述。由于这个数据库将是一个社区资源，它需要高能核物理社区的财政和人力支持。该数据库最终应该包含所有已发表的数据，从Bevalac、AGS和SPS到RHIC和LHC能量，质子-质子到核-核碰撞以及其他相关系统，以及所有可观测到的数据。这样一个数据库将带来巨大的科学回报，因为它使系统研究更容易，并允许更简单的理论模型对广泛的新旧实验进行基准测试。此外，越来越需要汇编高能核数据，用于储存管理、惯性约束聚变的技术开发以及即将到来的设施(如Next Linear Collider)的目标和源开发等应用。为了提高该数据库的实用性，我们建议定期对数据进行评估，并在专题综述中总结结果。
{"title":"A high-energy nuclear database proposal","authors":"David A. Brown, R. Vogt","doi":"10.1556/APH.27.2006.2-3.46","DOIUrl":"https://doi.org/10.1556/APH.27.2006.2-3.46","url":null,"abstract":"We propose to develop a high-energy heavy-ion experimental database and make it accessible to the scientific community through an on-line interface. This database will be searchable and cross-indexed with relevant publications, including published detector descriptions. Since this database will be a community resource, it requires the high-energy nuclear physics community’s financial and manpower support. This database should eventually contain all published data from the Bevalac, AGS and SPS to RHIC and LHC energies, proton-proton to nucleus-nucleus collisions as well as other relevant systems, and all measured observables. Such a database would have tremendous scientific payoff as it makes systematic studies easier and allows simpler benchmarking of theoretical models to a broad range of old and new experiments. Furthermore, there is a growing need for compilations of high-energy nuclear data for applications including stockpile stewardship, technology development for inertial confinement fusion and target and source development for upcoming facilities such as the Next Linear Collider. To enhance the utility of this database, we propose periodically performing evaluations of the data and summarizing the results in topical reviews.","PeriodicalId":201208,"journal":{"name":"Acta Physica Hungarica A) Heavy Ion Physics","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127686375","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 : 2005-10-12DOI: 10.1556/APH.27.2006.2-3.47
G. Wolschin, M. Biyajima, T. Mizoguchi, N. Suzuki
The extent of a locally equilibrated parton plasma in d+Au collisions at √s NN =200 GeV is investigated as a function of centrality in a nonequilibrium-statistical framework. Based on a three-sources model, analytical solutions of a relativistic diffusion equation are in precise agreement with recent data for charged-particle pseudorapidity distributions. The moving midrapidity source indicates the size of the local thermal equilibrium region after hadronization. In central d+Au collisions it contains 19% of the produced particles.
{"title":"Local thermalization in d+Au collisions","authors":"G. Wolschin, M. Biyajima, T. Mizoguchi, N. Suzuki","doi":"10.1556/APH.27.2006.2-3.47","DOIUrl":"https://doi.org/10.1556/APH.27.2006.2-3.47","url":null,"abstract":"The extent of a locally equilibrated parton plasma in d+Au collisions at √s NN =200 GeV is investigated as a function of centrality in a nonequilibrium-statistical framework. Based on a three-sources model, analytical solutions of a relativistic diffusion equation are in precise agreement with recent data for charged-particle pseudorapidity distributions. The moving midrapidity source indicates the size of the local thermal equilibrium region after hadronization. In central d+Au collisions it contains 19% of the produced particles.","PeriodicalId":201208,"journal":{"name":"Acta Physica Hungarica A) Heavy Ion Physics","volume":"24 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123415127","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 : 2005-10-05DOI: 10.1556/APH.25.2006.2-4.32
Y. Kwon, Collaboration Phenix
PHENIX measures leptons at mid and forward rapidities and extracts leptons resulting from semi-leptonic decays of heavy quarks. We present PHENIX results related to heavy quark production, specifically the invariant cross section of the non-photonic single electrons produced at midrapidity in p+p and d+Au collisions at (sqrt {s_{NN} } = 200) GeV. The measured cross section for p+p collisions is compared with the NLO prediction, and a possible excess over the prediction is noted. The measured cross section for d+Au collisions scales with the number of colliding nucleon pairs from the p+p spectra.
{"title":"Open heavy flavor production from light ion collisions at RHIC","authors":"Y. Kwon, Collaboration Phenix","doi":"10.1556/APH.25.2006.2-4.32","DOIUrl":"https://doi.org/10.1556/APH.25.2006.2-4.32","url":null,"abstract":"PHENIX measures leptons at mid and forward rapidities and extracts leptons resulting from semi-leptonic decays of heavy quarks. We present PHENIX results related to heavy quark production, specifically the invariant cross section of the non-photonic single electrons produced at midrapidity in p+p and d+Au collisions at (sqrt {s_{NN} } = 200) GeV. The measured cross section for p+p collisions is compared with the NLO prediction, and a possible excess over the prediction is noted. The measured cross section for d+Au collisions scales with the number of colliding nucleon pairs from the p+p spectra.","PeriodicalId":201208,"journal":{"name":"Acta Physica Hungarica A) Heavy Ion Physics","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125959841","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.24.2005.1-4.33
J. Burward-Hoy
The gluon structure function in a nucleon and its nuclear modification may be studied by measuring a particle called J/Ψ that is produced primarily via gluon fusion in high energy collisions between protons or nuclei. The PHENIX Experiment at the Relativistic Heavy Ion Collider (RHIC) has measured the production of J/Ψ particles in d+Au collisions at center-of-mass energies of 200 GeV per nucleon via its lepton decay channels (dielectrons and dimuons). In 2003, approximately 2000 J/Ψ particles from the d+Au data set (and several hundred in p+p) has allowed for measures of its rapidity (between -2.2 and +2.4) and momentum (between 0.5 and 5 GeV/c) distributions. In particular, the ratio of the rapidity distributions of J/Ψ produced in d+Au and p+p collisions is measured as a function of the d+Au impact parameter (centrality dependence of the collision). These preliminary data will ultimately help us understand nuclear effects at this center-of-mass energy (including shadowing) in cold nuclear matter. In addition to comparisons to theoretical models, these data are also compared to the equivalent measurements of J/Ψ produced in lower energy p–A collisions from Fermilab.
{"title":"J/Ψ Production and Nuclear Effects for d+Au and p+p Collisions in PHENIX at RHIC","authors":"J. Burward-Hoy","doi":"10.1556/APH.24.2005.1-4.33","DOIUrl":"https://doi.org/10.1556/APH.24.2005.1-4.33","url":null,"abstract":"The gluon structure function in a nucleon and its nuclear modification may be studied by measuring a particle called J/Ψ that is produced primarily via gluon fusion in high energy collisions between protons or nuclei. The PHENIX Experiment at the Relativistic Heavy Ion Collider (RHIC) has measured the production of J/Ψ particles in d+Au collisions at center-of-mass energies of 200 GeV per nucleon via its lepton decay channels (dielectrons and dimuons). In 2003, approximately 2000 J/Ψ particles from the d+Au data set (and several hundred in p+p) has allowed for measures of its rapidity (between -2.2 and +2.4) and momentum (between 0.5 and 5 GeV/c) distributions. In particular, the ratio of the rapidity distributions of J/Ψ produced in d+Au and p+p collisions is measured as a function of the d+Au impact parameter (centrality dependence of the collision). These preliminary data will ultimately help us understand nuclear effects at this center-of-mass energy (including shadowing) in cold nuclear matter. In addition to comparisons to theoretical models, these data are also compared to the equivalent measurements of J/Ψ produced in lower energy p–A collisions from Fermilab.","PeriodicalId":201208,"journal":{"name":"Acta Physica Hungarica A) Heavy Ion Physics","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116239062","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.24.2005.1-4.40
J. Rak
The properties of jets produced in p+p, d+Au and Au+Au collisions at √{s_NN} = 200 GeV at RHIC are discussed. Using the method of two-particle correlations, the angular width and yield of the same and away-side correlation peaks are studied.
{"title":"Measurement of the Jet Properties and their Modifications in Heavy Ion Collisions","authors":"J. Rak","doi":"10.1556/APH.24.2005.1-4.40","DOIUrl":"https://doi.org/10.1556/APH.24.2005.1-4.40","url":null,"abstract":"The properties of jets produced in p+p, d+Au and Au+Au collisions at √{s_NN} = 200 GeV at RHIC are discussed. Using the method of two-particle correlations, the angular width and yield of the same and away-side correlation peaks are studied.","PeriodicalId":201208,"journal":{"name":"Acta Physica Hungarica A) Heavy Ion Physics","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124192577","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 : 2005-07-21DOI: 10.1556/APH.25.2006.2-4.18
L. Molnár
We present STAR results from identified particle spectra measured in (sqrt {s_{NN} } = 62.4) GEV Au-Au collisions. Particle production and system dynamics are compared to results at (sqrt {s_{NN} } = 200) GeV. We extract kinetic and chemical freeze-out parameters using blast wave model parametrization and statistical model. We discuss the effect of resonance decays on the extracted kinetic freeze-out parameters.
{"title":"Extraction of kinetic freeze-out properties and effect of resonance decays","authors":"L. Molnár","doi":"10.1556/APH.25.2006.2-4.18","DOIUrl":"https://doi.org/10.1556/APH.25.2006.2-4.18","url":null,"abstract":"We present STAR results from identified particle spectra measured in (sqrt {s_{NN} } = 62.4) GEV Au-Au collisions. Particle production and system dynamics are compared to results at (sqrt {s_{NN} } = 200) GeV. We extract kinetic and chemical freeze-out parameters using blast wave model parametrization and statistical model. We discuss the effect of resonance decays on the extracted kinetic freeze-out parameters.","PeriodicalId":201208,"journal":{"name":"Acta Physica Hungarica A) Heavy Ion Physics","volume":"59 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123133048","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 : 2005-07-01DOI: 10.1556/APH.22.2005.3-4.6
C. Beckmann
A set of selfconsistent Schwinger-Dyson equations for the Walecka model is derived within the framework of the Cornwall-Jackiw-Tomboulis formalism. In the Hartree approximation these equations are solved by propagators with T- and μ-dependent masses. The results are compared to tree-level calculations. The difference is most pronounced for the mass of the scalar meson.
{"title":"Selfconsistent calculations of hadrons at finite temperature","authors":"C. Beckmann","doi":"10.1556/APH.22.2005.3-4.6","DOIUrl":"https://doi.org/10.1556/APH.22.2005.3-4.6","url":null,"abstract":"A set of selfconsistent Schwinger-Dyson equations for the Walecka model is derived within the framework of the Cornwall-Jackiw-Tomboulis formalism. In the Hartree approximation these equations are solved by propagators with T- and μ-dependent masses. The results are compared to tree-level calculations. The difference is most pronounced for the mass of the scalar meson.","PeriodicalId":201208,"journal":{"name":"Acta Physica Hungarica A) Heavy Ion Physics","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122592504","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 : 2005-07-01DOI: 10.1556/APH.22.2005.3-4.5
S. Leupold
First, a historical overview is presented concerning the use of QCD sum rules to learn about the p-meson properties at finite nuclear densities. Second, it is shown that the combination of the sum rule technique with the large-N c expansion provides new insight. Especially it is possible to determine from the in-medium sum rules a vacuum(!) quantity which is an important ingredient for hadronic in-medium calculations of the p-meson spectral function. This quantity is the coupling strength of the p-nucleon system to the baryonic resonance N*(1520).
{"title":"What QCD sum rules tell about the rho meson — A new answer to an old question","authors":"S. Leupold","doi":"10.1556/APH.22.2005.3-4.5","DOIUrl":"https://doi.org/10.1556/APH.22.2005.3-4.5","url":null,"abstract":"First, a historical overview is presented concerning the use of QCD sum rules to learn about the p-meson properties at finite nuclear densities. Second, it is shown that the combination of the sum rule technique with the large-N c expansion provides new insight. Especially it is possible to determine from the in-medium sum rules a vacuum(!) quantity which is an important ingredient for hadronic in-medium calculations of the p-meson spectral function. This quantity is the coupling strength of the p-nucleon system to the baryonic resonance N*(1520).","PeriodicalId":201208,"journal":{"name":"Acta Physica Hungarica A) Heavy Ion Physics","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127061599","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 : 2005-07-01DOI: 10.1556/APH.22.2005.3-4.14
G. Fai, J. Qiu, Xiaofei Zhang
We summarize the calculation of Drell-Yan transverse-momentum distributions using QCD perturbation theory. In particular, the transversemomentum spectrum of low-mass Drell-Yan pairs is calculated with all-order resummation. We demonstrate that the transverse-momentum distribution of low-mass Drell-Yan pairs is an advantageous source of constraints on the gluon distribution and its nuclear dependence. We argue that low-mass Drell-Yan pairs in the forward region provide a good and clean probe of small-x gluons at RHIC and LHC.
{"title":"Low-Mass Drell-Yan Pairs at RHIC and LHC","authors":"G. Fai, J. Qiu, Xiaofei Zhang","doi":"10.1556/APH.22.2005.3-4.14","DOIUrl":"https://doi.org/10.1556/APH.22.2005.3-4.14","url":null,"abstract":"We summarize the calculation of Drell-Yan transverse-momentum distributions using QCD perturbation theory. In particular, the transversemomentum spectrum of low-mass Drell-Yan pairs is calculated with all-order resummation. We demonstrate that the transverse-momentum distribution of low-mass Drell-Yan pairs is an advantageous source of constraints on the gluon distribution and its nuclear dependence. We argue that low-mass Drell-Yan pairs in the forward region provide a good and clean probe of small-x gluons at RHIC and LHC.","PeriodicalId":201208,"journal":{"name":"Acta Physica Hungarica A) Heavy Ion Physics","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115500411","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 : 2005-07-01DOI: 10.1556/APH.22.2005.3-4.7
T. Biró, G. Purcsel
We investigate different ways of describing the thermodynamics of prehadronic matter in high-energy heavy-ion collisions. The non-extensive thermodynamics with certain assumptions enables an agreement between two important experimental facts. That cannot be achieved using the conventional Gibbs statistics. A massless quark-gluon plasma with E/N=1 GeV energy per particle and T=175 MeV spectral slope temperature can be assumed.
{"title":"Quark matter and non-extensive thermodynamics","authors":"T. Biró, G. Purcsel","doi":"10.1556/APH.22.2005.3-4.7","DOIUrl":"https://doi.org/10.1556/APH.22.2005.3-4.7","url":null,"abstract":"We investigate different ways of describing the thermodynamics of prehadronic matter in high-energy heavy-ion collisions. The non-extensive thermodynamics with certain assumptions enables an agreement between two important experimental facts. That cannot be achieved using the conventional Gibbs statistics. A massless quark-gluon plasma with E/N=1 GeV energy per particle and T=175 MeV spectral slope temperature can be assumed.","PeriodicalId":201208,"journal":{"name":"Acta Physica Hungarica A) Heavy Ion Physics","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128896203","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}
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