Pub Date : 2005-11-08DOI: 10.1556/APH.27.2006.2-3.6
B. I. Bezverkhny
Angular correlations between produced high-p TΞ− baryons and unidentified charged and neutral particles are observed in high-tower triggered (on a large electromagnetic energy deposit) √s=200 GeV p+p collisions. This trigger favors events with higher average multiplicity than those in minimum bias. These events are likely to contain jets. The average multiplicity of a high-tower triggered event is similar to that of a minimum bias event containing a Ξ baryon, which implies that Ξ baryons are likely to be produced in jets. Ξ− is higher in the triggered data then in the minimum bias sample.
{"title":"High transverse momentum Ξ baryon correlations in p+p collisions at √s=200 GeV","authors":"B. I. Bezverkhny","doi":"10.1556/APH.27.2006.2-3.6","DOIUrl":"https://doi.org/10.1556/APH.27.2006.2-3.6","url":null,"abstract":"Angular correlations between produced high-p TΞ− baryons and unidentified charged and neutral particles are observed in high-tower triggered (on a large electromagnetic energy deposit) √s=200 GeV p+p collisions. This trigger favors events with higher average multiplicity than those in minimum bias. These events are likely to contain jets. The average multiplicity of a high-tower triggered event is similar to that of a minimum bias event containing a Ξ baryon, which implies that Ξ baryons are likely to be produced in jets. Ξ− is higher in the triggered data then in the minimum bias sample.","PeriodicalId":201208,"journal":{"name":"Acta Physica Hungarica A) Heavy Ion Physics","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120947939","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 : 2005-11-08DOI: 10.1556/APH.27.2006.2-3.7
G. Bruno, A. Dainese
The NA57 experiment has measured the pT distributions of KSO, Λ, and (bar Lambda ) particles in fixed-target Pb−Pb interactions at √sNN=17.3 GeV, as a function of the collision centrality. In this paper we study the central-to-peripheral nuclear modification factors and compare them to other measurements and to theoretical predictions.
{"title":"First measurement of the strange particles R CP nuclear modification factors in heavy-ion collisions at the SPS","authors":"G. Bruno, A. Dainese","doi":"10.1556/APH.27.2006.2-3.7","DOIUrl":"https://doi.org/10.1556/APH.27.2006.2-3.7","url":null,"abstract":"The NA57 experiment has measured the pT distributions of KSO, Λ, and (bar Lambda ) particles in fixed-target Pb−Pb interactions at √sNN=17.3 GeV, as a function of the collision centrality. In this paper we study the central-to-peripheral nuclear modification factors and compare them to other measurements and to theoretical predictions.","PeriodicalId":201208,"journal":{"name":"Acta Physica Hungarica A) Heavy Ion Physics","volume":"9 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124466503","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 : 2005-11-04DOI: 10.1556/APH.27.2006.2-3.15
A. Dainese, C. Loizides, G. Paic
After a short summary of the predictions of the Parton Quenching Model (PQM) for the nuclear modification factor and its centrality dependence in Au−Au collisions at RHIC, we concentrate on back-to-back jet-like correlations at high transverse momentum. We illustrate how this probe is biased by the surface effect.
在简要总结了Parton猝灭模型(PQM)对RHIC Au - Au碰撞中核修饰因子及其中心性依赖的预测之后，我们将重点放在高横向动量下的背靠背射流相关上。我们说明了这个探针是如何被表面效应偏置的。
{"title":"Leading-particle suppression and surface emission in nucleus-nucleus collisions","authors":"A. Dainese, C. Loizides, G. Paic","doi":"10.1556/APH.27.2006.2-3.15","DOIUrl":"https://doi.org/10.1556/APH.27.2006.2-3.15","url":null,"abstract":"After a short summary of the predictions of the Parton Quenching Model (PQM) for the nuclear modification factor and its centrality dependence in Au−Au collisions at RHIC, we concentrate on back-to-back jet-like correlations at high transverse momentum. We illustrate how this probe is biased by the surface effect.","PeriodicalId":201208,"journal":{"name":"Acta Physica Hungarica A) Heavy Ion Physics","volume":"120 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125255622","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 : 2005-11-01DOI: 10.1556/APH.27.2006.2-3.44
S.Strauss, M.Beyer, S. Mattiello
We investigate two-quark correlations in hot and dense quark matter. To this end we use the light front field theory extended to finite temperature T and chemical potential μ. Therefore it is necessary to develop quantum statistics formulated on the light front plane. As a test case for light front quantization at finite T and μ we consider the NJL model. The solution of the in-medium gap equation leads to a constituent quark mass which depends on T and μ. Two-quark systems are considered in the pionic and diquark channel. We compute the masses of the two-body system using a T-matrix approach.
{"title":"Light front approach to correlations in hot quark matter","authors":"S.Strauss, M.Beyer, S. Mattiello","doi":"10.1556/APH.27.2006.2-3.44","DOIUrl":"https://doi.org/10.1556/APH.27.2006.2-3.44","url":null,"abstract":"We investigate two-quark correlations in hot and dense quark matter. To this end we use the light front field theory extended to finite temperature T and chemical potential μ. Therefore it is necessary to develop quantum statistics formulated on the light front plane. As a test case for light front quantization at finite T and μ we consider the NJL model. The solution of the in-medium gap equation leads to a constituent quark mass which depends on T and μ. Two-quark systems are considered in the pionic and diquark channel. We compute the masses of the two-body system using a T-matrix approach.","PeriodicalId":201208,"journal":{"name":"Acta Physica Hungarica A) Heavy Ion Physics","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122970983","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 : 2005-11-01DOI: 10.1556/APH.27.2006.2-3.32
M. Beyer, S. Mattiello, S. Strauss
Light-front quantization to many-particle systems of finite temperature and density provides a novel approach towards a relativistic description of quark matter and allows us to calculate the perturbative as well as the non-perturbative regime of QCD. Utilizing a Dyson expansion of light-front manybody Green’s functions we have so far calculated three-quark, quark-quark and quark-antiquark correlations that lead to the chiral phase transition, the formation of hadrons and color superconductivity in a hot and/or dense environment. Presently, we use an effective zero-range interaction, to compare our results with the more traditional instant form approach where applicable.
{"title":"Light-front field theory of relativistic quark matter","authors":"M. Beyer, S. Mattiello, S. Strauss","doi":"10.1556/APH.27.2006.2-3.32","DOIUrl":"https://doi.org/10.1556/APH.27.2006.2-3.32","url":null,"abstract":"Light-front quantization to many-particle systems of finite temperature and density provides a novel approach towards a relativistic description of quark matter and allows us to calculate the perturbative as well as the non-perturbative regime of QCD. Utilizing a Dyson expansion of light-front manybody Green’s functions we have so far calculated three-quark, quark-quark and quark-antiquark correlations that lead to the chiral phase transition, the formation of hadrons and color superconductivity in a hot and/or dense environment. Presently, we use an effective zero-range interaction, to compare our results with the more traditional instant form approach where applicable.","PeriodicalId":201208,"journal":{"name":"Acta Physica Hungarica A) Heavy Ion Physics","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125603058","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 : 2005-11-01DOI: 10.1556/APH.27.2006.2-3.9
T. Henry
This paper presents the most recent nuclear k T measurements from STAR derived from multi-particle jet reconstruction of d+Au and p+p collisions at √s=200 GeV. Since jets reconstructed from multiple particles are relatively free of fragmentation biases, nuclear k Tcan be measured with greater certainty in this way than with traditional di-hadron correlations. Multiparticle jet reconstruction can also be used for a direct measurement of the fragmentation function.
{"title":"Nuclear k T in d+Au collisions from multi-particle jet reconstruction at STAR","authors":"T. Henry","doi":"10.1556/APH.27.2006.2-3.9","DOIUrl":"https://doi.org/10.1556/APH.27.2006.2-3.9","url":null,"abstract":"This paper presents the most recent nuclear k T measurements from STAR derived from multi-particle jet reconstruction of d+Au and p+p collisions at √s=200 GeV. Since jets reconstructed from multiple particles are relatively free of fragmentation biases, nuclear k Tcan be measured with greater certainty in this way than with traditional di-hadron correlations. Multiparticle jet reconstruction can also be used for a direct measurement of the fragmentation function.","PeriodicalId":201208,"journal":{"name":"Acta Physica Hungarica A) Heavy Ion Physics","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127125096","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 : 2005-10-31DOI: 10.1556/APH.27.2006.2-3.2
Alberto Accardi
Knowing whether a hadron is formed inside or outside the nuclear medium is very important for correctly interpreting jet quenching in heavy-ion collisions. The cleanest experimental environment to study the space-time evolution of hadronization is semi-inclusive DIS on nuclear targets. 2 frameworks are presently competing to explain the observed attenuation of hadron production: quark energy loss, with hadron formation outside the nucleus [2, 3], and nuclear absorption with hadronization starting inside the nucleus [4–6]. I demonstrate that the observed approximate A2/3 scaling of experimental data cannot conclusively establish the correctness of either energy loss or absorption.
{"title":"Can we distinguish energy loss from hadron absorption","authors":"Alberto Accardi","doi":"10.1556/APH.27.2006.2-3.2","DOIUrl":"https://doi.org/10.1556/APH.27.2006.2-3.2","url":null,"abstract":"Knowing whether a hadron is formed inside or outside the nuclear medium is very important for correctly interpreting jet quenching in heavy-ion collisions. The cleanest experimental environment to study the space-time evolution of hadronization is semi-inclusive DIS on nuclear targets. 2 frameworks are presently competing to explain the observed attenuation of hadron production: quark energy loss, with hadron formation outside the nucleus [2, 3], and nuclear absorption with hadronization starting inside the nucleus [4–6]. I demonstrate that the observed approximate A2/3 scaling of experimental data cannot conclusively establish the correctness of either energy loss or absorption.","PeriodicalId":201208,"journal":{"name":"Acta Physica Hungarica A) Heavy Ion Physics","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130570691","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 : 2005-10-31DOI: 10.1556/APH.27.2006.2-3.33
M. Chojnacki
We study the dynamical appearance of scaling solutions in relativistic hydrodynamics. The phase transition effects are included through the temperature dependent sound velocity. If a pre-equilibrium transverse flow is included in the initial conditions, then it may reach the form of the asymptotic Hubble flow, r/t, in short evolution times, 7–15 fm. The numerical solutions are found to support the freeze-out models (Blast-Wave, Buda-Lund, Cracow).
{"title":"Hubble-like Flows in Relativistic Heavy-Ion Collisions","authors":"M. Chojnacki","doi":"10.1556/APH.27.2006.2-3.33","DOIUrl":"https://doi.org/10.1556/APH.27.2006.2-3.33","url":null,"abstract":"We study the dynamical appearance of scaling solutions in relativistic hydrodynamics. The phase transition effects are included through the temperature dependent sound velocity. If a pre-equilibrium transverse flow is included in the initial conditions, then it may reach the form of the asymptotic Hubble flow, r/t, in short evolution times, 7–15 fm. The numerical solutions are found to support the freeze-out models (Blast-Wave, Buda-Lund, Cracow).","PeriodicalId":201208,"journal":{"name":"Acta Physica Hungarica A) Heavy Ion Physics","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123730113","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 : 2005-10-29DOI: 10.1556/APH.27.2006.2-3.42
T. S. Biró, G. Purcsel
We present first results of the development of a test particle simulation for solving non-extensive extensions of the elastic two-particle Boltzmann equation. Stationary one-particle energy distributions with power-law tail are obtained.
{"title":"Numerical simulation of non-extensive Boltzmann equation","authors":"T. S. Biró, G. Purcsel","doi":"10.1556/APH.27.2006.2-3.42","DOIUrl":"https://doi.org/10.1556/APH.27.2006.2-3.42","url":null,"abstract":"We present first results of the development of a test particle simulation for solving non-extensive extensions of the elastic two-particle Boltzmann equation. Stationary one-particle energy distributions with power-law tail are obtained.","PeriodicalId":201208,"journal":{"name":"Acta Physica Hungarica A) Heavy Ion Physics","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123809560","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 : 2005-10-28DOI: 10.1556/APH.27.2006.2-3.16
P. Constantin
We present preliminary results from intermediate pT(1–5 GeV/c) di-hadron azimuthal correlations induced by hadronic di-jets produced in AuAu collisions at √sNN=200 GeV. The near-side (Δϕ∼0) has a typical singlepeaked structure which broadens with the centrality of the collision. A qualitatively new phenomenon shows up in the shape of the away-side (Δϕ∼π): it has a symmetric, double-peaked structure in central and mid-central collisions.
{"title":"Di-jet shape modification in heavy ion collisions","authors":"P. Constantin","doi":"10.1556/APH.27.2006.2-3.16","DOIUrl":"https://doi.org/10.1556/APH.27.2006.2-3.16","url":null,"abstract":"We present preliminary results from intermediate pT(1–5 GeV/c) di-hadron azimuthal correlations induced by hadronic di-jets produced in AuAu collisions at √sNN=200 GeV. The near-side (Δϕ∼0) has a typical singlepeaked structure which broadens with the centrality of the collision. A qualitatively new phenomenon shows up in the shape of the away-side (Δϕ∼π): it has a symmetric, double-peaked structure in central and mid-central collisions.","PeriodicalId":201208,"journal":{"name":"Acta Physica Hungarica A) Heavy Ion Physics","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114337292","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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