Pub Date : 2006-07-01DOI: 10.1556/APH.27.2006.1.10
T. Falter, W. Cassing, K. Gallmeister, U. Mosel
We investigate the attenuation of hadrons in deep inelastic lepton-nucleus scattering in the kinematical regime of the HERMES and Jefferson Lab experiments. The calculation is carried out in the framework of a BUU transport model. Our results indicate a strong influence of (pre)hadronic final state interactions on the observed multiplicity ratios.
{"title":"Hadron attenuation at HERMES and Jefferson Lab","authors":"T. Falter, W. Cassing, K. Gallmeister, U. Mosel","doi":"10.1556/APH.27.2006.1.10","DOIUrl":"https://doi.org/10.1556/APH.27.2006.1.10","url":null,"abstract":"We investigate the attenuation of hadrons in deep inelastic lepton-nucleus scattering in the kinematical regime of the HERMES and Jefferson Lab experiments. The calculation is carried out in the framework of a BUU transport model. Our results indicate a strong influence of (pre)hadronic final state interactions on the observed multiplicity ratios.","PeriodicalId":201208,"journal":{"name":"Acta Physica Hungarica A) Heavy Ion Physics","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134554084","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 : 2006-07-01DOI: 10.1556/APH.27.2006.1.17
D. Trnka
Recent experimental results on the in-medium modification of the ω meson are discussed. The experiment described was performed at the ELSA accelerator facility in Bonn using the combined detector system of Crystal Barrel and TAPS. The ω meson was identified via the reaction γ+A→ω+X→π0γ+X.
{"title":"In-medium ω photoproduction with CBELSA/TAPS","authors":"D. Trnka","doi":"10.1556/APH.27.2006.1.17","DOIUrl":"https://doi.org/10.1556/APH.27.2006.1.17","url":null,"abstract":"Recent experimental results on the in-medium modification of the ω meson are discussed. The experiment described was performed at the ELSA accelerator facility in Bonn using the combined detector system of Crystal Barrel and TAPS. The ω meson was identified via the reaction γ+A→ω+X→π0γ+X.","PeriodicalId":201208,"journal":{"name":"Acta Physica Hungarica A) Heavy Ion Physics","volume":"165 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127313197","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 : 2006-07-01DOI: 10.1556/APH.27.2006.1.19
G. Chanfray, M. Ericson
We discuss the in-medium behaviour of the QCD scalar susceptibility and of the sigma mass in a chiral relativistic theory which incorporates the scalar response of the nucleon. We also study the many-body effects in the propagation of the scalar meson in the nuclear medium arising from its coupling to two-pion states. The same modification applies to the QCD scalar susceptibility. We conclude with the nuclear physics implications for the in-medium scalar nucleon-nucleon attraction.
{"title":"QCD Susceptibilities, Nuclear Saturation and Two-Pion Processes","authors":"G. Chanfray, M. Ericson","doi":"10.1556/APH.27.2006.1.19","DOIUrl":"https://doi.org/10.1556/APH.27.2006.1.19","url":null,"abstract":"We discuss the in-medium behaviour of the QCD scalar susceptibility and of the sigma mass in a chiral relativistic theory which incorporates the scalar response of the nucleon. We also study the many-body effects in the propagation of the scalar meson in the nuclear medium arising from its coupling to two-pion states. The same modification applies to the QCD scalar susceptibility. We conclude with the nuclear physics implications for the in-medium scalar nucleon-nucleon attraction.","PeriodicalId":201208,"journal":{"name":"Acta Physica Hungarica A) Heavy Ion Physics","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132535108","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}
The dynamical evolution of the heavy-ion collision is described by a transport equation of QMD type evolving nucleons, N* and Δ resonances, Λ′s and Σ baryons, furthermore, π′s, η′s, ρ′s, σ′s, ω′s and kaons with their isospin degrees of freedom. The input cross sections and resonance parameters of the model are fitted to the available nucleon-nucleon and pion-nucleon cross sections. One consequence of the chiral restoration is the mixing of parity partners. We look for a possible signature of the mixing of vector and axialvector mesons in heavy-ion collisions. We suggest an experimental method for its observation.
{"title":"ρ-A 1 mixing in pion induced reaction","authors":"G. Wolf","doi":"10.1556/APH.27.2006.1.7","DOIUrl":"https://doi.org/10.1556/APH.27.2006.1.7","url":null,"abstract":"The dynamical evolution of the heavy-ion collision is described by a transport equation of QMD type evolving nucleons, N* and Δ resonances, Λ′s and Σ baryons, furthermore, π′s, η′s, ρ′s, σ′s, ω′s and kaons with their isospin degrees of freedom. The input cross sections and resonance parameters of the model are fitted to the available nucleon-nucleon and pion-nucleon cross sections. One consequence of the chiral restoration is the mixing of parity partners. We look for a possible signature of the mixing of vector and axialvector mesons in heavy-ion collisions. We suggest an experimental method for its observation.","PeriodicalId":201208,"journal":{"name":"Acta Physica Hungarica A) Heavy Ion Physics","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130814387","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 : 2006-07-01DOI: 10.1556/APH.27.2006.1.16
K. Suzuki
Study of pionic atom has been revisited by a recent discovery of deeply bound pionic states in the context of possible sensitivity to the partial chiral restoration in the nuclear medium. Precisely measured binding energies and widths of the deeply bound π− Is states in 115,119,123Sn in 116,120,124Sn(d,3He) reactions at recoil-free conditions are used to deduce the medium-modified isovector scattering amplitude as b1 = 0.115 ± 0.007mπ−1. The observed enhancement of b1 over the free πN value infers 34% reduction of (leftlangle {bar qq} rightrangle ) at the normal nuclear density, ρ = 0.17 fm−3.
在核介质中对部分手性恢复可能敏感的背景下，最近深束缚态的发现重新审视了电子原子的研究。利用精确测量的116,120,124Sn(d,3He)中115,119,123Sn中深束缚π - Is态在无后坐力条件下的束缚能和宽度，推导出介质修正等矢量散射振幅为b1 = 0.115±0.007mπ−1。观察到b1比自由πN值增大34% reduction of (leftlangle {bar qq} rightrangle ) at the normal nuclear density, ρ = 0.17 fm−3.
{"title":"Chiral symmetry probed with pionic atoms","authors":"K. Suzuki","doi":"10.1556/APH.27.2006.1.16","DOIUrl":"https://doi.org/10.1556/APH.27.2006.1.16","url":null,"abstract":"Study of pionic atom has been revisited by a recent discovery of deeply bound pionic states in the context of possible sensitivity to the partial chiral restoration in the nuclear medium. Precisely measured binding energies and widths of the deeply bound π− Is states in 115,119,123Sn in 116,120,124Sn(d,3He) reactions at recoil-free conditions are used to deduce the medium-modified isovector scattering amplitude as b1 = 0.115 ± 0.007mπ−1. The observed enhancement of b1 over the free πN value infers 34% reduction of (leftlangle {bar qq} rightrangle ) at the normal nuclear density, ρ = 0.17 fm−3.","PeriodicalId":201208,"journal":{"name":"Acta Physica Hungarica A) Heavy Ion Physics","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115013277","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 : 2006-07-01DOI: 10.1556/APH.27.2006.1.13
A. Majumder
Two-particle correlations within a single jet produced in deeply inelastic scattering (DIS) off a large nucleus as well as in heavy-ion collisions are studied. This is performed within the framework of the medium modi fied dihadron fragmentation functions. The modification occurs due to gluon bremsstrahlung induced by multiple scattering. The modified fragmentation functions for dihadrons are found to follow closely that of single hadrons leading to a weak nuclear suppression of their ratios as measured by HERMES in DIS experiments. Meanwhile, a moderate medium enhancement of the nearside correlation of two high-pT hadrons is found in central heavy-ion collisions, partially due to trigger bias caused by the competition between parton energy loss and the initial Cronin effect.
{"title":"High- p T hadron-hadron correlations in vacuum and in matter","authors":"A. Majumder","doi":"10.1556/APH.27.2006.1.13","DOIUrl":"https://doi.org/10.1556/APH.27.2006.1.13","url":null,"abstract":"Two-particle correlations within a single jet produced in deeply inelastic scattering (DIS) off a large nucleus as well as in heavy-ion collisions are studied. This is performed within the framework of the medium modi fied dihadron fragmentation functions. The modification occurs due to gluon bremsstrahlung induced by multiple scattering. The modified fragmentation functions for dihadrons are found to follow closely that of single hadrons leading to a weak nuclear suppression of their ratios as measured by HERMES in DIS experiments. Meanwhile, a moderate medium enhancement of the nearside correlation of two high-pT hadrons is found in central heavy-ion collisions, partially due to trigger bias caused by the competition between parton energy loss and the initial Cronin effect.","PeriodicalId":201208,"journal":{"name":"Acta Physica Hungarica A) Heavy Ion Physics","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128098757","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 : 2006-04-01DOI: 10.1556/APH.25.2006.2-4.15
A. David
The NA60 experiment at the CERN-SPS studies dimuon production in proton-nucleus and heavy-ion collisions. We report on the effort towards measuring open charm in Indium-Indium collisions. Although work on the final background subtraction procedure is still under way, we can already demonstrate that the detector performance is adequate to separate prompt dimuous from muon pairs originating in distant (Dbar D) decays.
{"title":"Measuring Displaced muon Pairs in Indium-Indium collisions at the CERN SPS","authors":"A. David","doi":"10.1556/APH.25.2006.2-4.15","DOIUrl":"https://doi.org/10.1556/APH.25.2006.2-4.15","url":null,"abstract":"The NA60 experiment at the CERN-SPS studies dimuon production in proton-nucleus and heavy-ion collisions. We report on the effort towards measuring open charm in Indium-Indium collisions. Although work on the final background subtraction procedure is still under way, we can already demonstrate that the detector performance is adequate to separate prompt dimuous from muon pairs originating in distant (Dbar D) decays.","PeriodicalId":201208,"journal":{"name":"Acta Physica Hungarica A) Heavy Ion Physics","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124503954","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 : 2006-04-01DOI: 10.1556/APH.25.2006.2-4.41
B. Back
The PHOBOS Collaboration has measured charged particles emitted over the range −5.4<η<5.4 for Au+Au collisions at energies of $$sqrt {s_{NN} } = 19.6$$ , 62.4, 130 and 200 GeV. In this contribution I will present recent results on the pseudorapidity distributions, total charged-particle production, and collective flow of particles obtained from these measurements.
{"title":"Recent Results from PHOBOS","authors":"B. Back","doi":"10.1556/APH.25.2006.2-4.41","DOIUrl":"https://doi.org/10.1556/APH.25.2006.2-4.41","url":null,"abstract":"The PHOBOS Collaboration has measured charged particles emitted over the range −5.4<η<5.4 for Au+Au collisions at energies of \u0000$$sqrt {s_{NN} } = 19.6$$\u0000\u0000 , 62.4, 130 and 200 GeV. In this contribution I will present recent results on the pseudorapidity distributions, total charged-particle production, and collective flow of particles obtained from these measurements.","PeriodicalId":201208,"journal":{"name":"Acta Physica Hungarica A) Heavy Ion Physics","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130456661","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 : 2006-04-01DOI: 10.1556/APH.25.2006.2-4.23
A. Badal, R. Barbera, G. Re, A. Palmeri, G. Pappalardo, A. Pulvirenti, F. Riggi
Results are shown from a Monte Carlo simulation study of the capabilities of the Inner Tracking System of the ALICE experiment, used in standalone mode, for HBT analysis of Pb−Pb collisions at LHC energies (5.5 ATeV). Different values of the coherence factor and the Gaussian source radius have been studied. For this purpose, a specific ITS stand-alone tracking algorithm, based on the Denby-Peterson neural algorithm, has been developed.
{"title":"Study of the Capabilities of the ALICE inner tracking system stand-alone for HBT analysis","authors":"A. Badal, R. Barbera, G. Re, A. Palmeri, G. Pappalardo, A. Pulvirenti, F. Riggi","doi":"10.1556/APH.25.2006.2-4.23","DOIUrl":"https://doi.org/10.1556/APH.25.2006.2-4.23","url":null,"abstract":"Results are shown from a Monte Carlo simulation study of the capabilities of the Inner Tracking System of the ALICE experiment, used in standalone mode, for HBT analysis of Pb−Pb collisions at LHC energies (5.5 ATeV). Different values of the coherence factor and the Gaussian source radius have been studied. For this purpose, a specific ITS stand-alone tracking algorithm, based on the Denby-Peterson neural algorithm, has been developed.","PeriodicalId":201208,"journal":{"name":"Acta Physica Hungarica A) Heavy Ion Physics","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114166269","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 : 2006-04-01DOI: 10.1556/APH.25.2006.2-4.20
Hai Jiang, Xiangzhou Cai
We report the centrality dependence of transverse mass (m t ) spectra at mid-rapidity for the identified strange hadrons K S 0 , ϕ (Lambda + bar Lambda ) and (Xi ^ - + bar Xi ^ + ) in d+Au collisions at RHIC. The measured transverse momentum (p T ) covers 0.4
我们报告了在RHIC的d+Au碰撞中识别的奇异强子K S 0， ϕ (Lambda + bar Lambda )和(Xi ^ - + bar Xi ^ + )的中速横向质量(m t)谱的中心性依赖。测得的横向动量(p T)在K S 0、0、(Lambda + bar Lambda )为0.4
{"title":"Strange hadron production in d+Au collisions at RHIC","authors":"Hai Jiang, Xiangzhou Cai","doi":"10.1556/APH.25.2006.2-4.20","DOIUrl":"https://doi.org/10.1556/APH.25.2006.2-4.20","url":null,"abstract":"We report the centrality dependence of transverse mass (m t ) spectra at mid-rapidity for the identified strange hadrons K S 0 , ϕ (Lambda + bar Lambda ) and (Xi ^ - + bar Xi ^ + ) in d+Au collisions at RHIC. The measured transverse momentum (p T ) covers 0.4<p T <6.0 GeV/c for K S 0 , o, (Lambda + bar Lambda ) and 0.6<p T <5.0 GeV/c for (Xi ^ - + bar Xi ^ + ). The binary collision normalized nuclear modification factors R CP of these hadrons indicate that the Cronin effect in d+Au collisions has a distinct particle-type dependence. the R CP ratios show a distinct baryons versus mesons dependence: the R CP for (Xi ^ - + bar Xi ^ + ) follows that for (Lambda + bar Lambda ) while the R CP for the ϕ is close to that for the K S 0 . Similar features have also been observed in Au+Au collisions. Initial parton scattering alone is not sufficient to explain this particle-type dependence. Hadronization processes are likely to be important for determining hadron properties in high-energy collisions as suggested by coalescence and recombination models.","PeriodicalId":201208,"journal":{"name":"Acta Physica Hungarica A) Heavy Ion Physics","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131289438","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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