Pub Date : 2004-05-06DOI: 10.1556/APH.24.2005.1-4.4
J. Manninen, F. Becattini, Antti Keranen, M. Gaździcki, R. Stock
We present a detailed study of chemical freeze-out in nucleus–nucleus collisions at beam energies of 11.6, 30, 40, 80 and 158A GeV. By analyzing hadronic multiplicities within the statistical hadronization approach, we have studied the chemical equilibration of the system as a function of center of mass energy and of the parameters of the source. Additionally, we have tested and compared different versions of the statistical model, with special emphasis on possible explanations of the observed strangeness hadronic phase space under-saturation.
{"title":"Study on Chemical Equilibrium in Nucleus–Nucleus Collisions at Relativistic Energies","authors":"J. Manninen, F. Becattini, Antti Keranen, M. Gaździcki, R. Stock","doi":"10.1556/APH.24.2005.1-4.4","DOIUrl":"https://doi.org/10.1556/APH.24.2005.1-4.4","url":null,"abstract":"We present a detailed study of chemical freeze-out in nucleus–nucleus collisions at beam energies of 11.6, 30, 40, 80 and 158A GeV. By analyzing hadronic multiplicities within the statistical hadronization approach, we have studied the chemical equilibration of the system as a function of center of mass energy and of the parameters of the source. Additionally, we have tested and compared different versions of the statistical model, with special emphasis on possible explanations of the observed strangeness hadronic phase space under-saturation.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"26 1","pages":"23-29"},"PeriodicalIF":0.0,"publicationDate":"2004-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76123722","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 : 2004-04-06DOI: 10.1556/APH.24.2005.1-4.41
Fuqiang Wang
Recent results from RHIC on high p ⊥ suppression and statistical jet reconstruction are presented. The results are discussed in context of the two prerequisites for QGP formation: high energy density and parton thermalization.
{"title":"Measurement of Jet Modification at RHIC","authors":"Fuqiang Wang","doi":"10.1556/APH.24.2005.1-4.41","DOIUrl":"https://doi.org/10.1556/APH.24.2005.1-4.41","url":null,"abstract":"Recent results from RHIC on high p ⊥ suppression and statistical jet reconstruction are presented. The results are discussed in context of the two prerequisites for QGP formation: high energy density and parton thermalization.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"11 1","pages":"299-306"},"PeriodicalIF":0.0,"publicationDate":"2004-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88670600","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 : 2004-03-15DOI: 10.1556/APH.24.2005.1-4.3
R. Debbe, F. C. Collaboration
We report BRAHMS results from RHIC d+Au and p+p collisions at √{sNN} = 200 GeV. A remarkable change in the nuclear modification factor RdAu is seen as the pseudorapidity of the detected charged hadrons changes from zero at mid-rapidity to 3.2 at the most forward angle studied during the 2003 run. For pseudorapidity η > 1 the suppression of the Rcp factor is more pronounced in the sample of central events in contrast to the behavior at mid-rapidity where the central events show higher enhancement compared to a semi-central sample. These results are consistent with a saturated Au wave function strongly affected by quantum evolution at higher values of rapidity.
{"title":"BRAHMS Results in the Context of Saturation and Quantum Evolution","authors":"R. Debbe, F. C. Collaboration","doi":"10.1556/APH.24.2005.1-4.3","DOIUrl":"https://doi.org/10.1556/APH.24.2005.1-4.3","url":null,"abstract":"We report BRAHMS results from RHIC d+Au and p+p collisions at √{sNN} = 200 GeV. A remarkable change in the nuclear modification factor RdAu is seen as the pseudorapidity of the detected charged hadrons changes from zero at mid-rapidity to 3.2 at the most forward angle studied during the 2003 run. For pseudorapidity η > 1 the suppression of the Rcp factor is more pronounced in the sample of central events in contrast to the behavior at mid-rapidity where the central events show higher enhancement compared to a semi-central sample. These results are consistent with a saturated Au wave function strongly affected by quantum evolution at higher values of rapidity.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"53 1","pages":"15-21"},"PeriodicalIF":0.0,"publicationDate":"2004-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81477740","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 : 2004-01-15DOI: 10.1556/APH.24.2005.1-4.13
C. Pruneau
We present measurements of dynamical net charge fluctuations in Au+Au collisions at √{sNN} = 0, 130 and 200 GeV using the measure ν+-, dyn. The dynamical fluctuations are finite and exhibit a rather modest dependence on beam energy. We also find they violate the trivial 1/N scaling expected for nuclear collisions consisting of independent nucleon–nucleon interactions. We speculate this may be due to a combination of thermalization and radial flow effects.
{"title":"Excitation Function of Net Charge Fluctuations at RHIC","authors":"C. Pruneau","doi":"10.1556/APH.24.2005.1-4.13","DOIUrl":"https://doi.org/10.1556/APH.24.2005.1-4.13","url":null,"abstract":"We present measurements of dynamical net charge fluctuations in Au+Au collisions at √{sNN} = 0, 130 and 200 GeV using the measure ν+-, dyn. The dynamical fluctuations are finite and exhibit a rather modest dependence on beam energy. We also find they violate the trivial 1/N scaling expected for nuclear collisions consisting of independent nucleon–nucleon interactions. We speculate this may be due to a combination of thermalization and radial flow effects.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"21 1","pages":"85-90"},"PeriodicalIF":0.0,"publicationDate":"2004-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83229119","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 : 2004-01-01DOI: 10.1556/APH.20.2004.1-2.33
Z. Kis, E. Paspalakis, F. Renzoni, S. Stenholm
We present a brief overview of our recent research in the field of adiabatic control of quantum mechanical processes. The most striking properties of the schemes that we study are their reliability and robustness, hence, they can be used not only for standard quantum control problems but for quantum computation as well.
{"title":"Controlling Material by Light and Light by Material via Adiabatic Processes","authors":"Z. Kis, E. Paspalakis, F. Renzoni, S. Stenholm","doi":"10.1556/APH.20.2004.1-2.33","DOIUrl":"https://doi.org/10.1556/APH.20.2004.1-2.33","url":null,"abstract":"We present a brief overview of our recent research in the field of adiabatic control of quantum mechanical processes. The most striking properties of the schemes that we study are their reliability and robustness, hence, they can be used not only for standard quantum control problems but for quantum computation as well.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"1 1","pages":"161-164"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89069306","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 : 2004-01-01DOI: 10.1556/APH.20.2004.1-2.32
V. Man'ko, V. Andreev
{"title":"The Classification of Two-Particle Spin States and BellCHSH Inequalities for Mixed States","authors":"V. Man'ko, V. Andreev","doi":"10.1556/APH.20.2004.1-2.32","DOIUrl":"https://doi.org/10.1556/APH.20.2004.1-2.32","url":null,"abstract":"","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"124 1","pages":"157-160"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88020076","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 : 2003-06-02DOI: 10.1556/APH.21.2004.2-4.39
J. Lange
Results from the search for Γ → e+ e− and(B(bar B) to e^ pm X) in Au+Au collisions at(sqrt s = 200) GeV are presented.
给出了在(sqrt s = 200) GeV上Au+Au碰撞中寻找Γ→e+ e−和(B(bar B) to e^ pm X)的结果。
{"title":"B Physics at STAR","authors":"J. Lange","doi":"10.1556/APH.21.2004.2-4.39","DOIUrl":"https://doi.org/10.1556/APH.21.2004.2-4.39","url":null,"abstract":"Results from the search for Γ → e+ e− and(B(bar B) to e^ pm X) in Au+Au collisions at(sqrt s = 200) GeV are presented.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"1 1","pages":"357-364"},"PeriodicalIF":0.0,"publicationDate":"2003-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82256082","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.15.2002.3-4.4
B. Lasiuk
Preliminary results for the production of high transverse momentum hadrons are reported from the STAR detector at the Relativistic Heavy Ion Collider. Negative hadron spectra for 2 1.5 GeV/c. An initial measurement of the flavor dependence of baryon production at pT ≤ 2.25 GeV/c is also presented and discussed.
{"title":"Hard physics at STAR","authors":"B. Lasiuk","doi":"10.1556/APH.15.2002.3-4.4","DOIUrl":"https://doi.org/10.1556/APH.15.2002.3-4.4","url":null,"abstract":"Preliminary results for the production of high transverse momentum hadrons are reported from the STAR detector at the Relativistic Heavy Ion Collider. Negative hadron spectra for 2 1.5 GeV/c. An initial measurement of the flavor dependence of baryon production at pT ≤ 2.25 GeV/c is also presented and discussed.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"20 1","pages":"205-214"},"PeriodicalIF":0.0,"publicationDate":"2002-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78544306","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.15.2002.3-4.2
T. Trainor
I review the first STAR event-by-event analysis of fluctuations, event multiplicity fluctuations and large-scale two-particle p t correlations. Significant nonstatistical charge-independent and charge-dependent fluctuations and correlations are observed.
{"title":"First results from STAR EbyE analysis at RHIC","authors":"T. Trainor","doi":"10.1556/APH.15.2002.3-4.2","DOIUrl":"https://doi.org/10.1556/APH.15.2002.3-4.2","url":null,"abstract":"I review the first STAR event-by-event analysis of fluctuations, event multiplicity fluctuations and large-scale two-particle p t correlations. Significant nonstatistical charge-independent and charge-dependent fluctuations and correlations are observed.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"19 1","pages":"183-193"},"PeriodicalIF":0.0,"publicationDate":"2002-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78096755","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.15.2002.3-4.26
R. Bellwied
We investigate the transverse polarization of A hyperons produced in 11.6 A GeV/c Au−Au collisions at the AGS. Experiment E896 yields results in two independent detector systems, a Silicon Drift Detector Array at midrapidity and a Distributed Drift Chamber at forward rapidity. In this article we focus on the mid-rapidity measurements. The results reveal a dependence of the polarization on the transverse momentum and Feynman-x of the A hyperons. The heavy-ion data are consistent with previous measurements in proton-proton and proton-nucleus collisions within statistical errors.
我们研究了AGS中11.6 A GeV/c Au - Au碰撞产生的A超子的横向极化。实验E896在两个独立的探测器系统中得到了结果，一个硅漂移探测器阵列在中速和一个分布式漂移室在正速。在本文中，我们主要关注中速测量。结果揭示了a超子的横向动量和费曼-x对极化的依赖性。在统计误差范围内，重离子数据与先前质子-质子和质子-核碰撞的测量结果一致。
{"title":"Transverse Polarization of Lambda Hyperons in Relativistic Au-Au Collisions at the AGS","authors":"R. Bellwied","doi":"10.1556/APH.15.2002.3-4.26","DOIUrl":"https://doi.org/10.1556/APH.15.2002.3-4.26","url":null,"abstract":"We investigate the transverse polarization of A hyperons produced in 11.6 A GeV/c Au−Au collisions at the AGS. Experiment E896 yields results in two independent detector systems, a Silicon Drift Detector Array at midrapidity and a Distributed Drift Chamber at forward rapidity. In this article we focus on the mid-rapidity measurements. The results reveal a dependence of the polarization on the transverse momentum and Feynman-x of the A hyperons. The heavy-ion data are consistent with previous measurements in proton-proton and proton-nucleus collisions within statistical errors.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"36 1","pages":"437-444"},"PeriodicalIF":0.0,"publicationDate":"2002-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88356193","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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