Pub Date : 2002-09-01DOI: 10.1556/APH.15.2002.3-4.24
W. Bauer, M. K. Berkenbusch, L. Beaulieu, T. Lefort, R. Korteling, K. Kwiatkowski, H. Breuer, S. Pratt, W. Hsi, V. Viola, S. Yennello
And analysis of recent ISiS data [1] is performed and a comparison with percolation-based theories is conducted. We pay particular attention to detector acceptance corrections as well as the role of sequential decays of excited pre-fragments. The corrected data are subjected to a scaling analysis. We find evidence for a continuous phase transition in these nuclear multi-fragmentation events and extract the value for the critical exponents: σ=0.5±0.1 and τ=2.35±0.05. In addition, we find Tc=8.3±0.2 MeV.
{"title":"Setting Bounds on Critical Exponents with Event-by-Event Analysis of Nuclear Fragmentation Data","authors":"W. Bauer, M. K. Berkenbusch, L. Beaulieu, T. Lefort, R. Korteling, K. Kwiatkowski, H. Breuer, S. Pratt, W. Hsi, V. Viola, S. Yennello","doi":"10.1556/APH.15.2002.3-4.24","DOIUrl":"https://doi.org/10.1556/APH.15.2002.3-4.24","url":null,"abstract":"And analysis of recent ISiS data [1] is performed and a comparison with percolation-based theories is conducted. We pay particular attention to detector acceptance corrections as well as the role of sequential decays of excited pre-fragments. The corrected data are subjected to a scaling analysis. We find evidence for a continuous phase transition in these nuclear multi-fragmentation events and extract the value for the critical exponents: σ=0.5±0.1 and τ=2.35±0.05. In addition, we find Tc=8.3±0.2 MeV.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"102 1","pages":"417-426"},"PeriodicalIF":0.0,"publicationDate":"2002-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85715090","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 : 2002-09-01DOI: 10.1556/APH.15.2002.3-4.25
M. Tonjes, A. Molen, G. Westfall
The RHIC accelerator collided Au on Au beams at (sqrt {s_{NN} } = 130) GeV in the summer of 2000. To study these collisions, the RHIC experiments have been using a number of observables. One new observable in the field of relativistic heavy ions is the balance function. The balance function can be used to measure the correlation of charged particle pairs in rapidity. The rapidity separation of a particle pair that is created at the same point indicates the time of hadronization for that pair. Preliminary balance function analyses of STAR data are reported. The calculation of a balance function for hadron gas simulations (HIJING) is also discussed in this paper. These preliminary results indicate that the balance function is a useful observable in heavy-ion collisions.
{"title":"Clocking hadronization at RHIC","authors":"M. Tonjes, A. Molen, G. Westfall","doi":"10.1556/APH.15.2002.3-4.25","DOIUrl":"https://doi.org/10.1556/APH.15.2002.3-4.25","url":null,"abstract":"The RHIC accelerator collided Au on Au beams at (sqrt {s_{NN} } = 130) GeV in the summer of 2000. To study these collisions, the RHIC experiments have been using a number of observables. One new observable in the field of relativistic heavy ions is the balance function. The balance function can be used to measure the correlation of charged particle pairs in rapidity. The rapidity separation of a particle pair that is created at the same point indicates the time of hadronization for that pair. Preliminary balance function analyses of STAR data are reported. The calculation of a balance function for hadron gas simulations (HIJING) is also discussed in this paper. These preliminary results indicate that the balance function is a useful observable in heavy-ion collisions.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"22 1","pages":"427-436"},"PeriodicalIF":0.0,"publicationDate":"2002-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80065661","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 : 2002-09-01DOI: 10.1556/APH.15.2002.3-4.8
I. Johnson
We report raw photon, neutral pion and eta measurements at RHIC. Photons in the energy range from 100MeV − 4GeV were detected by reconstructing e + e − pair production, γ+Z→e ++e −+Z, with the STAR Time Projection Chamber (TPC). Along with the photon detection technique we discuss the purity of the photon candidates and measurements of hadronic decays via their electromagnetic decay channels. The π0→γ and η→γγ decay channels are addressed.
我们报告了在RHIC上的原始光子，中性介子和eta测量。利用STAR时间投影室(STAR Time Projection Chamber, TPC)重构e +e−对产生的γ+Z→e ++e−+Z，探测到了100MeV ~ 4GeV能量范围内的光子。结合光子探测技术，讨论了候选光子的纯度和通过其电磁衰减通道测量强子衰变。确定了π0→γ和η→γ衰变通道。
{"title":"Photon production in Au+Au collisions at (sqrt {s_{NN} } = 130) GeV","authors":"I. Johnson","doi":"10.1556/APH.15.2002.3-4.8","DOIUrl":"https://doi.org/10.1556/APH.15.2002.3-4.8","url":null,"abstract":"We report raw photon, neutral pion and eta measurements at RHIC. Photons in the energy range from 100MeV − 4GeV were detected by reconstructing e + e − pair production, γ+Z→e ++e −+Z, with the STAR Time Projection Chamber (TPC). Along with the photon detection technique we discuss the purity of the photon candidates and measurements of hadronic decays via their electromagnetic decay channels. The π0→γ and η→γγ decay channels are addressed.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"18 1","pages":"247-255"},"PeriodicalIF":0.0,"publicationDate":"2002-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82512496","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 : 2002-09-01DOI: 10.1556/APH.15.2002.3-4.23
G. Verde, Duncan A. Brown, P. Danielewicz, C. Gelbke, W. G. Lynch, M. Tsang
The influence of protons emitted from both fast and slow emission mechanisms in 2-proton correlations measured in heavy ion collisions at intermediate energies is discussed. The size of the fast emitting source is found to be determined mainly by the width of the correlation peak at 20 MeV/c, rather than by its magnitude. To illustrate the new analysis technique, the total momentum dependence of p-p correlations measured in 14N+197Au reactions at E/A=75 MeV is studied with an imaging analysis. The extracted results and the basic ideas behind the proposed analysis technique provide new tools for using particle-partcile correlation measurements as a probe of nuclear reactions.
{"title":"New approach to imaging of two-proton source functions","authors":"G. Verde, Duncan A. Brown, P. Danielewicz, C. Gelbke, W. G. Lynch, M. Tsang","doi":"10.1556/APH.15.2002.3-4.23","DOIUrl":"https://doi.org/10.1556/APH.15.2002.3-4.23","url":null,"abstract":"The influence of protons emitted from both fast and slow emission mechanisms in 2-proton correlations measured in heavy ion collisions at intermediate energies is discussed. The size of the fast emitting source is found to be determined mainly by the width of the correlation peak at 20 MeV/c, rather than by its magnitude. To illustrate the new analysis technique, the total momentum dependence of p-p correlations measured in 14N+197Au reactions at E/A=75 MeV is studied with an imaging analysis. The extracted results and the basic ideas behind the proposed analysis technique provide new tools for using particle-partcile correlation measurements as a probe of nuclear reactions.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"56 1","pages":"407-416"},"PeriodicalIF":0.0,"publicationDate":"2002-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88740520","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 : 2002-09-01DOI: 10.1556/aph.15.2002.3-4.7
O. Barannikova
Preliminary results on antiproton and charged kaon spectra and the net-proton number at mid-rapidity are reported for Au+Au collisions at (sqrt {s_{NN} } = 130) GeV as measured by the STAR experiment at RHIC. Inverse slope parameters of the transverse mass distributions increase with the collision centrality, consistent with a strong radial flow. The antiproton and charged kaon extrapolated yields, normalized to the uncorrected negatively charged hadron yield, increase with the collision centrality. A finite but small number of net-baryons is found to be present at mid-rapidity.
{"title":"Antiproton and Charged Kaon Production in $sqrt{s_{NN}}$ = 130 GeV Au+Au Collisions at RHIC","authors":"O. Barannikova","doi":"10.1556/aph.15.2002.3-4.7","DOIUrl":"https://doi.org/10.1556/aph.15.2002.3-4.7","url":null,"abstract":"Preliminary results on antiproton and charged kaon spectra and the net-proton number at mid-rapidity are reported for Au+Au collisions at (sqrt {s_{NN} } = 130) GeV as measured by the STAR experiment at RHIC. Inverse slope parameters of the transverse mass distributions increase with the collision centrality, consistent with a strong radial flow. The antiproton and charged kaon extrapolated yields, normalized to the uncorrected negatively charged hadron yield, increase with the collision centrality. A finite but small number of net-baryons is found to be present at mid-rapidity.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"19 1","pages":"237-245"},"PeriodicalIF":0.0,"publicationDate":"2002-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73714079","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 : 2002-09-01DOI: 10.1556/APH.15.2002.3-4.12
J. Heuser
First results from measurements of Au−Au collisions at (sqrt {s_{NN} } = 130) GeV, performed with the PHENIX experiment during the initial physics run of Brookhaven National Laboratory’s Relativistic Heavy Ion Collider in summer 2000, are summarized. Global characterization of the collisions was obtained from charged-particle multiplicity and transverse energy densities. At mid-rapidity, dNch/dν and dET/dν rise steadily with the event centrality, while the ratio / remains constant. Transverse momentum spectra of charged particles up to 5 GeV/c yield a suppression of high-momentum particles in the most central events when compared to a simple scaling of binary nucleon-nucleon collisions. The scaling matches with peripheral collisions. Transverse momentum spectra of identified neutral pions from 1 to 4 GeV/c in peripheral collisions show consistency with point-like scaling with the average number of binary collisions. Yields in central collisions are significantly suppressed. Transverse momentum spectra of identified charged hadrons up to 3.5 GeV/c were measured in minimum bias events. The mass and centrality dependencies of inverse slope parameters and mean transverse momenta were determined. Inclusive spectra of electrons were measured for momenta from a few hundred MeV/c to 4 GeV/c. Inclusive photon spectra from a few hundred MeV/c to 3 GeV/c were obtained from conversion pair measurements.
{"title":"Results from the first physics run of PHENIX at RHIC","authors":"J. Heuser","doi":"10.1556/APH.15.2002.3-4.12","DOIUrl":"https://doi.org/10.1556/APH.15.2002.3-4.12","url":null,"abstract":"First results from measurements of Au−Au collisions at (sqrt {s_{NN} } = 130) GeV, performed with the PHENIX experiment during the initial physics run of Brookhaven National Laboratory’s Relativistic Heavy Ion Collider in summer 2000, are summarized. Global characterization of the collisions was obtained from charged-particle multiplicity and transverse energy densities. At mid-rapidity, dNch/dν and dET/dν rise steadily with the event centrality, while the ratio / remains constant. Transverse momentum spectra of charged particles up to 5 GeV/c yield a suppression of high-momentum particles in the most central events when compared to a simple scaling of binary nucleon-nucleon collisions. The scaling matches with peripheral collisions. Transverse momentum spectra of identified neutral pions from 1 to 4 GeV/c in peripheral collisions show consistency with point-like scaling with the average number of binary collisions. Yields in central collisions are significantly suppressed. Transverse momentum spectra of identified charged hadrons up to 3.5 GeV/c were measured in minimum bias events. The mass and centrality dependencies of inverse slope parameters and mean transverse momenta were determined. Inclusive spectra of electrons were measured for momenta from a few hundred MeV/c to 4 GeV/c. Inclusive photon spectra from a few hundred MeV/c to 3 GeV/c were obtained from conversion pair measurements.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"13 1","pages":"291-301"},"PeriodicalIF":0.0,"publicationDate":"2002-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74382863","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 : 2002-09-01DOI: 10.1556/APH.15.2002.3-4.3
P. Fachini
Preliminary results from measurements of resonances (K *0(892), (overline {K*^0 } (892)), Φ(1020), and ρ(770)) and weakly decaying particles (Λ(1116), (bar Lambda (1116)), and K S 0 (498)) are presented. The measurements are performed at mid-rapidity by the STAR detector in (sqrt {s_{NN} } = 130) GeV Au−Au collisions at RHIC. The ratios K *0/h−, (overline {K*^0 } /K), and (bar Lambda /Lambda ) are compared to measurements at different energies and colliding systems. Estimates of thermal parameters, such as temperature and baryon chemical potential, are also presented.
{"title":"Resonance studies at STAR","authors":"P. Fachini","doi":"10.1556/APH.15.2002.3-4.3","DOIUrl":"https://doi.org/10.1556/APH.15.2002.3-4.3","url":null,"abstract":"Preliminary results from measurements of resonances (K *0(892), (overline {K*^0 } (892)), Φ(1020), and ρ(770)) and weakly decaying particles (Λ(1116), (bar Lambda (1116)), and K S 0 (498)) are presented. The measurements are performed at mid-rapidity by the STAR detector in (sqrt {s_{NN} } = 130) GeV Au−Au collisions at RHIC. The ratios K *0/h−, (overline {K*^0 } /K), and (bar Lambda /Lambda ) are compared to measurements at different energies and colliding systems. Estimates of thermal parameters, such as temperature and baryon chemical potential, are also presented.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"41 1","pages":"195-204"},"PeriodicalIF":0.0,"publicationDate":"2002-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79057198","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}
We describe updated calculations of (Qbar Q) production in pp and π -p interactions. We compare these results to total cross section data and discuss how the baseline cross sections extrapolate to heavy ion collider energies. We touch upon the differences between leading and next-to-leading order heavy quark production. Finally, we discuss the implications of our calculations for quarkonium production. Our discussion here focuses on bottom quarks.
{"title":"Heavy quark production in heavy ion colliders","authors":"R. Vogt","doi":"10.1556/APH.18.2003.1.2","DOIUrl":"https://doi.org/10.1556/APH.18.2003.1.2","url":null,"abstract":"We describe updated calculations of (Qbar Q) production in pp and π -p interactions. We compare these results to total cross section data and discuss how the baseline cross sections extrapolate to heavy ion collider energies. We touch upon the differences between leading and next-to-leading order heavy quark production. Finally, we discuss the implications of our calculations for quarkonium production. Our discussion here focuses on bottom quarks.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"14 1","pages":"11-20"},"PeriodicalIF":0.0,"publicationDate":"2002-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85369814","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}
We propose a method to study lattice QCD at finite temperature (T) and chemical potential (μ). We test the method and compare it with the Glasgow method using nf = 4 staggered QCD with imaginary μ. The critical endpoint (E) of QCD on the Re(μ) —T plane is located. We use nf = 2 + 1 dynamical staggered quarks with semi-realistic masses on Lt = 4 lattices. Our results are based on ({mathcal{O}})(103 – 104) configurations.
{"title":"Lattice QCD results at finite T and μ","authors":"Z. Fodor, S. Katz","doi":"10.1556/APH.18.2003.1.5","DOIUrl":"https://doi.org/10.1556/APH.18.2003.1.5","url":null,"abstract":"We propose a method to study lattice QCD at finite temperature (T) and chemical potential (μ). We test the method and compare it with the Glasgow method using nf = 4 staggered QCD with imaginary μ. The critical endpoint (E) of QCD on the Re(μ) —T plane is located. We use nf = 2 + 1 dynamical staggered quarks with semi-realistic masses on Lt = 4 lattices. Our results are based on ({mathcal{O}})(103 – 104) configurations.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"54 1","pages":"41-48"},"PeriodicalIF":0.0,"publicationDate":"2002-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83206778","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 : 2002-03-01DOI: 10.1556/APH.16.2002.1-4.40
A. Stefanini, M. Bini, Giovanni Casini, P. R. Maurenzig, A. Olmi, G. Pasquali, S. Piantelli, G. Poggi, N. Taccetti
New experimental results on pre-equilibrium effects and neck emission at Fermi energies are presented. Coulomb trajectory calculations have been performed to explain the observed IMF velocity distributions.
{"title":"Pre-equilibrium effects and neck emission in 10-40 AMeV heavy ion collisions","authors":"A. Stefanini, M. Bini, Giovanni Casini, P. R. Maurenzig, A. Olmi, G. Pasquali, S. Piantelli, G. Poggi, N. Taccetti","doi":"10.1556/APH.16.2002.1-4.40","DOIUrl":"https://doi.org/10.1556/APH.16.2002.1-4.40","url":null,"abstract":"New experimental results on pre-equilibrium effects and neck emission at Fermi energies are presented. Coulomb trajectory calculations have been performed to explain the observed IMF velocity distributions.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"3 1","pages":"379-386"},"PeriodicalIF":0.0,"publicationDate":"2002-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77792800","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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