Pub Date : 2005-10-01DOI: 10.1556/APH.24.2005.1-4.9
S. Kox
This contribution presents general features of the hadron physics program developed at the Thomas Jefferson Laboratory. This is made using the EM and Weak probes provided by the electron beams of the CEBAF accelerator and address mostly the non-perturbative regime of QCD.
{"title":"Hadron Physics studied at TJNAF with the Electro- Magnetic and Weak probes","authors":"S. Kox","doi":"10.1556/APH.24.2005.1-4.9","DOIUrl":"https://doi.org/10.1556/APH.24.2005.1-4.9","url":null,"abstract":"This contribution presents general features of the hadron physics program developed at the Thomas Jefferson Laboratory. This is made using the EM and Weak probes provided by the electron beams of the CEBAF accelerator and address mostly the non-perturbative regime of QCD.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"2 1","pages":"59-64"},"PeriodicalIF":0.0,"publicationDate":"2005-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73404469","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.24.2005.1-4.39
K. Haglin
We study spectral properties of the φ meson at finite temperature using an effective Lagrangian together with finite-temperature field theory as a basis for modeling. General field-theoretic arguments are then used to establish the lifetime of φ in hot hadronic matter. We find from the model, and we therefore propose a scenario in which, the phi decays inside the fireball. Early decays into μ+μ- occur at high temperature while measurable hadronic decays into K+K- (not suffering rescattering) occur at freezeout, where flow could be substantial. These results provide a consistent picture, if not possible interpretation of NA49 and NA50 data from CERN.
{"title":"ϕ Meson Propagation and Decay at Finite Temperature","authors":"K. Haglin","doi":"10.1556/APH.24.2005.1-4.39","DOIUrl":"https://doi.org/10.1556/APH.24.2005.1-4.39","url":null,"abstract":"We study spectral properties of the φ meson at finite temperature using an effective Lagrangian together with finite-temperature field theory as a basis for modeling. General field-theoretic arguments are then used to establish the lifetime of φ in hot hadronic matter. We find from the model, and we therefore propose a scenario in which, the phi decays inside the fireball. Early decays into μ+μ- occur at high temperature while measurable hadronic decays into K+K- (not suffering rescattering) occur at freezeout, where flow could be substantial. These results provide a consistent picture, if not possible interpretation of NA49 and NA50 data from CERN.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"106 1","pages":"283-289"},"PeriodicalIF":0.0,"publicationDate":"2005-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79258115","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.24.2005.1-4.23
R. Bellwied
Preliminary strangeness enhancement factors measured in pp, d–Au and Au–Au collisions at RHIC will be discussed and compared to model predictions. The impact of elementary collision effects, such as Cronin enhancement and jet production, on collective parameters measured in Au–Au collisions, e.g. radial expansion and distributions, will be discussed.
{"title":"Strangeness Enhancement and Thermalization in pp, d A and AA Collisions at RHIC","authors":"R. Bellwied","doi":"10.1556/APH.24.2005.1-4.23","DOIUrl":"https://doi.org/10.1556/APH.24.2005.1-4.23","url":null,"abstract":"Preliminary strangeness enhancement factors measured in pp, d–Au and Au–Au collisions at RHIC will be discussed and compared to model predictions. The impact of elementary collision effects, such as Cronin enhancement and jet production, on collective parameters measured in Au–Au collisions, e.g. radial expansion and distributions, will be discussed.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"5 1","pages":"167-174"},"PeriodicalIF":0.0,"publicationDate":"2005-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82873168","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.24.2005.1-4.18
J. Kapusta, Yang Li
We derive the identical-particle correlation function when the particles are allowed to elastically rescatter in the medium in which they were produced. We then specialize to the case where the scatterers are static, localized potentials. In one dimension the correlation function is unaffected by the rescattering. In three dimensions, and with a Gaussian source, the ratio Rout/Rside increases with momentum from less than one to more than one. Specific numbers are used to illustrate kaon interferometry.
{"title":"HBT Interferometry with Rescattering in the Medium","authors":"J. Kapusta, Yang Li","doi":"10.1556/APH.24.2005.1-4.18","DOIUrl":"https://doi.org/10.1556/APH.24.2005.1-4.18","url":null,"abstract":"We derive the identical-particle correlation function when the particles are allowed to elastically rescatter in the medium in which they were produced. We then specialize to the case where the scatterers are static, localized potentials. In one dimension the correlation function is unaffected by the rescattering. In three dimensions, and with a Gaussian source, the ratio Rout/Rside increases with momentum from less than one to more than one. Specific numbers are used to illustrate kaon interferometry.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"190 1","pages":"125-130"},"PeriodicalIF":0.0,"publicationDate":"2005-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76052190","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.24.2005.1-4.25
M. Bleicher, D. Bandyopadhyay, E. Bratkovskaya, M. Reiter, S. Soff, H. Stöcker, M. Leeuwen, S. Bass, W. Cassing
Transverse hadron spectra from proton–proton, proton–nucleus and nucleus–nucleus collisions from 2 A·GeV to 21.3 A·TeV are investigated within two independent transport approaches (HSD and UrQMD). For central Au+Au (Pb+Pb) collisions at energies above Elab ∼ 5 A·GeV, the measured K± transverse mass spectra have a larger inverse slope parameter than expected from the default calculations. The additional pressure — as supported by lattice QCD calculations at finite quark chemical potential μq and temperature T — might be generated by strong interactions in the early pre-hadronic/partonic phase of central Au+Au (Pb+Pb) collisions E.L. Bratkovskaya et al., Phys. Rev. C 69 (2004) 054907.
{"title":"Transverse Pressure in Relativistic Nuclear Collisions: Evidence for Partonic Interactions?","authors":"M. Bleicher, D. Bandyopadhyay, E. Bratkovskaya, M. Reiter, S. Soff, H. Stöcker, M. Leeuwen, S. Bass, W. Cassing","doi":"10.1556/APH.24.2005.1-4.25","DOIUrl":"https://doi.org/10.1556/APH.24.2005.1-4.25","url":null,"abstract":"Transverse hadron spectra from proton–proton, proton–nucleus and nucleus–nucleus collisions from 2 A·GeV to 21.3 A·TeV are investigated within two independent transport approaches (HSD and UrQMD). For central Au+Au (Pb+Pb) collisions at energies above Elab ∼ 5 A·GeV, the measured K± transverse mass spectra have a larger inverse slope parameter than expected from the default calculations. The additional pressure — as supported by lattice QCD calculations at finite quark chemical potential μq and temperature T — might be generated by strong interactions in the early pre-hadronic/partonic phase of central Au+Au (Pb+Pb) collisions E.L. Bratkovskaya et al., Phys. Rev. C 69 (2004) 054907.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"9 1","pages":"181-188"},"PeriodicalIF":0.0,"publicationDate":"2005-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73680560","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.24.2005.1-4.2
W. Busza
A discussion is given of the principal features observed in pp, pA, dA, and AA collisions at high energies. In particular it is pointed out that the rapidity distributions for all these colliding systems exhibit great similarity, and furthermore they all show the same evolution with energy.
{"title":"Multiparticle Production in pp, p A , d A and AA Collisions","authors":"W. Busza","doi":"10.1556/APH.24.2005.1-4.2","DOIUrl":"https://doi.org/10.1556/APH.24.2005.1-4.2","url":null,"abstract":"A discussion is given of the principal features observed in pp, pA, dA, and AA collisions at high energies. In particular it is pointed out that the rapidity distributions for all these colliding systems exhibit great similarity, and furthermore they all show the same evolution with energy.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"18 1","pages":"3-13"},"PeriodicalIF":0.0,"publicationDate":"2005-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86886068","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.24.2005.1-4.15
K. Zbiri, J. Aichelin
Using the quantum molecular dynamics approach we have started to analyze the results of the recent INDRA experiments at GSI experiments. For the first time we could identify a midrapidity source in which fragments are formed from a almost identical fraction of projectile and target nucleons. In smaller systems we have not found this source. Nevertheless the fragment spectra at small and large angles are completely determined by the dynamics. We discuss how fragments are formed in the different regions of phase space and what they tell us about the reaction mechanism.
{"title":"Origin of Fragments in Multifragmentation Reactions","authors":"K. Zbiri, J. Aichelin","doi":"10.1556/APH.24.2005.1-4.15","DOIUrl":"https://doi.org/10.1556/APH.24.2005.1-4.15","url":null,"abstract":"Using the quantum molecular dynamics approach we have started to analyze the results of the recent INDRA experiments at GSI experiments. For the first time we could identify a midrapidity source in which fragments are formed from a almost identical fraction of projectile and target nucleons. In smaller systems we have not found this source. Nevertheless the fragment spectra at small and large angles are completely determined by the dynamics. We discuss how fragments are formed in the different regions of phase space and what they tell us about the reaction mechanism.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"1 1","pages":"99-110"},"PeriodicalIF":0.0,"publicationDate":"2005-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90076653","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.24.2005.1-4.43
M. Djordjevic, M. Gyulassy
We here give an overview of the main results for heavy quark energy loss in a hot QCD matter. The results are used to compute charm quark suppression and elliptic flow at RHIC. Our numerical estimates predict only small suppression of high p⊥ charm quarks.
{"title":"Charm quark suppression and elliptic flow at RHIC","authors":"M. Djordjevic, M. Gyulassy","doi":"10.1556/APH.24.2005.1-4.43","DOIUrl":"https://doi.org/10.1556/APH.24.2005.1-4.43","url":null,"abstract":"We here give an overview of the main results for heavy quark energy loss in a hot QCD matter. The results are used to compute charm quark suppression and elliptic flow at RHIC. Our numerical estimates predict only small suppression of high p⊥ charm quarks.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"46 1","pages":"313-319"},"PeriodicalIF":0.0,"publicationDate":"2005-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79104118","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.24.2005.1-4.48
E. Norbeck, Y. Onel
The LHC will collide protons at √{s} = 14 TeV and lead ions at √{sNN} = 5.5 TeV. These energies are much higher than with the Fermilab Tevatron or RHIC. Huge experiments are being assembled at four interaction points along the 27 km LHC ring. Although it is a large step into the unknown, there have been extensive calculations predicting data rates for a wide variety of processes to be observed by these experiments. Here we consider primarily the results of lead collisions as will be observed by the CMS experiment.
{"title":"LHC Heavy-Ion Program: a CMS Perspective","authors":"E. Norbeck, Y. Onel","doi":"10.1556/APH.24.2005.1-4.48","DOIUrl":"https://doi.org/10.1556/APH.24.2005.1-4.48","url":null,"abstract":"The LHC will collide protons at √{s} = 14 TeV and lead ions at √{sNN} = 5.5 TeV. These energies are much higher than with the Fermilab Tevatron or RHIC. Huge experiments are being assembled at four interaction points along the 27 km LHC ring. Although it is a large step into the unknown, there have been extensive calculations predicting data rates for a wide variety of processes to be observed by these experiments. Here we consider primarily the results of lead collisions as will be observed by the CMS experiment.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"134 6 1","pages":"353-358"},"PeriodicalIF":0.0,"publicationDate":"2005-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83772143","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.24.2005.1-4.14
M. Zielínska-Pfabé, V. Baran, M. Colonna, M. Toro, H. Wolter
The Boltzmann–Uehling–Uhlenbeck (BUU) approach with density fluctuations was used to study the density dependence of the asymmetry term in the nuclear equation of state (EOS). The isospin diffusion and equilibration process was investigated. The isotopic ratios of light particles were not sensitive enough to distinguish between asy-stiff and asy-soft EOS. However, the isospin ratio seems to be more sensitive to the density dependence of the asymmetry term in the nuclear equation of state and it favors a more asy-stiff equation of state.
{"title":"Fluctuations and Isospin Equilibration in Heavy Ion Reactions","authors":"M. Zielínska-Pfabé, V. Baran, M. Colonna, M. Toro, H. Wolter","doi":"10.1556/APH.24.2005.1-4.14","DOIUrl":"https://doi.org/10.1556/APH.24.2005.1-4.14","url":null,"abstract":"The Boltzmann–Uehling–Uhlenbeck (BUU) approach with density fluctuations was used to study the density dependence of the asymmetry term in the nuclear equation of state (EOS). The isospin diffusion and equilibration process was investigated. The isotopic ratios of light particles were not sensitive enough to distinguish between asy-stiff and asy-soft EOS. However, the isospin ratio seems to be more sensitive to the density dependence of the asymmetry term in the nuclear equation of state and it favors a more asy-stiff equation of state.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"18 1","pages":"91-97"},"PeriodicalIF":0.0,"publicationDate":"2005-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74388891","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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