检索结果-内蒙古大学图书馆

Cold nuclear matter effects on J/ψ production as constrained by deuteron-gold measurements at sNN=200 GeV

Physical review C 2008年第2期77卷 024912-024912页

作者： A. Adare S. S. Adler S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba H. Al-Bataineh J. Alexander A. Al-Jamel K. Aoki L. Aphecetche r. Armendariz S. H. Aronson J. Asai E. T. Atomssa r. Averbeck T. C. Awes B. Azmoun V. Babintsev G. Baksay L. Baksay A. Baldisseri K. N. Barish P. d. Barnes B. Bassalleck S. Bathe S. Batsouli V. Baublis F. Bauer A. Bazilevsky S. Belikov r. Bennett Y. Berdnikov A. A. Bickley M. T. Bjorndal J. G. Boissevain H. Borel K. Boyle M. L. Brooks d. S. Brown N. Bruner d. Bucher H. Buesching V. Bumazhnov G. Bunce J. M. Burward-Hoy S. Butsyk X. Camard S. Campbell P. Chand B. S. Chang W. C. Chang J.-L. Charvet S. Chernichenko J. Chiba C. Y. Chi M. Chiu I. J. Choi r. K. Choudhury T. Chujo P. Chung A. Churyn V. Cianciolo C. r. Cleven Y. Cobigo B. A. Cole M. P. Comets P. Constantin M. Csanád T. Csörgő J. P. Cussonneau T. dahms K. das G. david F. deák M. B. deaton K. dehmelt H. delagrange A. denisov d. d'Enterria A. deshpande E. J. desmond A. devismes O. dietzsch A. dion M. donadelli J. L. drachenberg O. drapier A. drees A. K. dubey A. durum d. dutta V. dzhordzhadze Y. V. Efremenko J. Egdemir F. Ellinghaus W. S. Emam A. Enokizono H. En'yo B. Espagnon S. Esumi K. O. Eyser d. E. Fields C. Finck M. Finger Jr. M. Finger F. Fleuret S. L. Fokin B. d. Fox Z. Fraenkel J. E. Frantz A. Franz A. d. Frawley K. Fujiwara Y. Fukao S.-Y. Fung T. Fusayasu S. Gadrat I. Garishvili M. Germain A. Glenn H. Gong M. Gonin J. Gosset Y. Goto r. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp T. Gunji H.-Å. Gustafsson T. Hachiya A. Hadj Henni C. Haegemann J. S. Haggerty H. Hamagaki r. Han A. G. Hansen H. Harada E. P. Hartouni K. Haruna M. Harvey E. Haslum K. Hasuko r. Hayano M. Heffner T. K. Hemmick T. Hester J. M. Heuser X. He P. Hidas H. Hiejima J. C. Hill r. Hobbs M. Hohlmann W. Holzmann K. Homma B. Hong A. Hoover T. Horaguchi d. Hornback T. Ichihara V. V. Ikonnikov K. Imai M. Inaba Y. Inoue M. Inuzuka d. Isenhower L. Isenhower M. Ishihara T. Isobe M. Issah A. Isupov B. V. Jacak J. Jia J. Jin O. Jinnouchi B. M. J University of Colorado Boulder Colorado 80309 USA Brookhaven National Laboratory Upton New York 11973-5000 USA Joint Institute for Nuclear Research RU-141980 Dubna Moscow Region Russia Columbia University New York 10027 and Nevis Laboratories Irvington New York 10533 USA Chemistry Department Stony Brook University Stony Brook SUNY New York 11794-3400 USA KEK High Energy Accelerator Research Organization Tsukuba Ibaraki 305-0801 Japan RIKEN The Institute of Physical and Chemical Research Wako Saitama 351-0198 Japan RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA New Mexico State University Las Cruces New Mexico 88003 USA Kyoto University Kyoto 606-8502 Japan SUBATECH (Ecole des Mines de Nantes CNRS-IN2P3 Université de Nantes) BP 20722 F-44307 Nantes France Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS-IN2P3 Route de Saclay F-91128 Palaiseau France Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794 USA Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino RU-142281 Russia Florida Institute of Technology Melbourne Florida 32901 USA Dapnia CEA Saclay F-91191 Gif-sur-Yvette France University of California—Riverside Riverside California 92521 USA Los Alamos National Laboratory Los Alamos New Mexico 87545 USA University of New Mexico Albuquerque New Mexico 87131 USA Institut für Kernphysik University of Muenster D-48149 Muenster Germany PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad Region RU-188300 Russia Saint Petersburg State Polytechnic University St. Petersburg Russia Lawrence Livermore National Laboratory Livermore California 94550 USA Bhabha Atomic Research Centre Bombay 400 085 India Yonsei University IPAP Seoul 120-749 Korea Institute of Physics Academia Sinica Taipei 11529 Taiwan University of Illinois at Urbana-

We present a new analysis of J/ψ production yields in deuteron-gold collisions at sNN=200 GeV using data taken from the PHENIX experiment in 2003 and previously published in S. S. Adler et al. [Phys. rev. Lett 96, 012304 (2006)]. The high statistics proton-proton J/ψ data taken in 2005 are used to improve the baseline measurement and thus construct updated cold nuclear matter modification factors (rdAu). A suppression of J/ψ in cold nuclear matter is observed as one goes forward in rapidity (in the deuteron-going direction), corresponding to a region more sensitive to initial-state low-x gluons in the gold nucleus. The measured nuclear modification factors are compared to theoretical calculations of nuclear shadowing to which a J/ψ (or precursor) breakup cross section is added. Breakup cross sections of σbreakup=2.8−1.4+1.7 (2.2−1.5+1.6) mb are obtained by fitting these calculations to the data using two different models of nuclear shadowing. These breakup cross-section values are consistent within large uncertainties with the 4.2±0.5 mb determined at lower collision energies. Projecting this range of cold nuclear matter effects to copper-copper and gold-gold collisions reveals that the current constraints are not sufficient to firmly quantify the additional hot nuclear matter effect.

关键词：

来源：评论

学校读者我要写书评

暂无评论

dihadron azimuthal correlations in Au+Au collisions at sNN=200 GeV

引用

Physical review C 2008年第1期78卷 014901-014901页

作者： A. Adare S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba H. Al-Bataineh J. Alexander A. Al-Jamel K. Aoki L. Aphecetche r. Armendariz S. H. Aronson J. Asai E. T. Atomssa r. Averbeck T. C. Awes B. Azmoun V. Babintsev G. Baksay L. Baksay A. Baldisseri K. N. Barish P. d. Barnes B. Bassalleck S. Bathe S. Batsouli V. Baublis F. Bauer A. Bazilevsky S. Belikov r. Bennett Y. Berdnikov A. A. Bickley M. T. Bjorndal J. G. Boissevain H. Borel K. Boyle M. L. Brooks d. S. Brown d. Bucher H. Buesching V. Bumazhnov G. Bunce J. M. Burward-Hoy S. Butsyk S. Campbell J.-S. Chai B. S. Chang J.-L. Charvet S. Chernichenko J. Chiba C. Y. Chi M. Chiu I. J. Choi T. Chujo P. Chung A. Churyn V. Cianciolo C. r. Cleven Y. Cobigo B. A. Cole M. P. Comets P. Constantin M. Csanád T. Csörgő T. dahms K. das G. david M. B. deaton K. dehmelt H. delagrange A. denisov d. d'Enterria A. deshpande E. J. desmond O. dietzsch A. dion M. donadelli J. L. drachenberg O. drapier A. drees A. K. dubey A. durum V. dzhordzhadze Y. V. Efremenko J. Egdemir F. Ellinghaus W. S. Emam A. Enokizono H. En'yo B. Espagnon S. Esumi K. O. Eyser d. E. Fields M. Finger M. Finger,, Jr. F. Fleuret S. L. Fokin B. Forestier Z. Fraenkel J. E. Frantz A. Franz A. d. Frawley K. Fujiwara Y. Fukao S.-Y. Fung T. Fusayasu S. Gadrat I. Garishvili F. Gastineau M. Germain A. Glenn H. Gong M. Gonin J. Gosset Y. Goto r. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp T. Gunji H. -Å. Gustafsson T. Hachiya A. Hadj Henni C. Haegemann J. S. Haggerty M. N. Hagiwara H. Hamagaki r. Han H. Harada E. P. Hartouni K. Haruna M. Harvey E. Haslum K. Hasuko r. Hayano M. Heffner T. K. Hemmick T. Hester J. M. Heuser X. He H. Hiejima J. C. Hill r. Hobbs M. Hohlmann M. Holmes W. Holzmann K. Homma B. Hong T. Horaguchi d. Hornback M. G. Hur T. Ichihara K. Imai M. Inaba Y. Inoue d. Isenhower L. Isenhower M. Ishihara T. Isobe M. Issah A. Isupov B. V. Jacak J. Jia J. Jin O. Jinnouchi B. M. Johnson K. S. Joo d. Jouan F. Kajihara S. Kametani N. Kamihara J. Kamin M. Kaneta J. H. Kang H. Kanou T. Kawagishi d. K University of Colorado Boulder Colorado 80309 USA Joint Institute for Nuclear Research RU-141980 Dubna Moscow Region Russia Columbia University New York New York 10027 USA and Nevis Laboratories Irvington New York 10533 USA Chemistry Department Stony Brook University SUNY Stony Brook New York 11794-3400 USA RIKEN The Institute of Physical and Chemical Research Wako Saitama 351-0198 Japan RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA New Mexico State University Las Cruces New Mexico 88003 USA Kyoto University Kyoto 606-8502 Japan SUBATECH (Ecole des Mines de Nantes CNRS-IN2P3 Université de Nantes) BP 20722 F-44307 Nantes France Brookhaven National Laboratory Upton New York 11973-5000 USA Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS-IN2P3 Route de Saclay F-91128 Palaiseau France Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794 USA Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino RU-142281 Russia Florida Institute of Technology Melbourne Florida 32901 USA Dapnia CEA Saclay F-91191 Gif-sur-Yvette France University of California-Riverside Riverside California 92521 USA Los Alamos National Laboratory Los Alamos New Mexico 87545 USA University of New Mexico Albuquerque New Mexico 87131 USA PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad region RU-188300 Russia Iowa State University Ames Iowa 50011 USA St. Petersburg State Polytechnic University St. Petersburg Russia Institut für Kernphysik University of Muenster D-48149 Muenster Germany KAERI Cyclotron Application Laboratory Seoul Korea Yonsei University IPAP Seoul 120-749 Korea KEK High Energy Accelerator Research Organization Tsukuba Ibaraki 305-0801 Japan University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA Vanderbilt University Nashville T

Azimuthal angle (Δϕ) correlations are presented for a broad range of transverse momentum (0.4<pT<10 GeV/c) and centrality (0–92%) selections for charged hadrons from dijets in Au+Au collisions at sNN=200 GeV. ...

Azimuthal angle (Δϕ) correlations are presented for a broad range of transverse momentum (0.4d centrality (0–92%) selections for charged hadrons from dijets in Au+Au collisions at sNN=200 GeV. With increasing pT, the away-side Δϕ distribution evolves from a broad and relatively flat shape to a concave shape, then to a convex shape. Comparisons with p+p data suggest that the away-side distribution can be divided into a partially suppressed “head” region centered at Δϕ~π, and an enhanced “shoulder” region centered at Δϕ~π±1.1. The pT spectrum for the associated hadrons in the head region softens toward central collisions. The spectral slope for the shoulder region is independent of centrality and trigger pT. The properties of the near-side distributions are also modified relative to those in p+p collisions, reflected by the broadening of the jet shape in Δϕ and Δη, and an enhancement of the per-trigger yield. However, these modifications seem to be limited to pT≲4 GeV/c, above which both the hadron pair shape and per-trigger yield become similar to p+p collisions. These observations suggest that both the away- and near-side distributions contain a jet fragmentation component which dominates for pT≳5 GeV/c and a medium-induced component which is important for pT≲4 GeV/c. We also quantify the role of jets at intermediate and low pT through the yield of jet-induced pairs in comparison with binary scaled p+p pair yield. The yield of jet-induced pairs is suppressed at high pair proxy energy (sum of the pT magnitudes of the two hadrons) and is enhanced at low pair proxy energy. The former is consistent with jet quenching; the latter is consistent with the enhancement of soft hadron pairs due to transport of lost energy to lower pT.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Quantitative constraints on the transport properties of hot partonic matter from semi-inclusive single high transverse momentum pion suppression in Au+Au collisions at sNN=200 GeV

引用

Physical review C 2008年第6期77卷 064907-064907页

作者： A. Adare S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba H. Al-Bataineh J. Alexander A. Al-Jamel K. Aoki L. Aphecetche r. Armendariz S. H. Aronson J. Asai E. T. Atomssa r. Averbeck T. C. Awes B. Azmoun V. Babintsev G. Baksay L. Baksay A. Baldisseri K. N. Barish P. d. Barnes B. Bassalleck S. Bathe S. Batsouli V. Baublis F. Bauer A. Bazilevsky S. Belikov r. Bennett Y. Berdnikov A. A. Bickley M. T. Bjorndal J. G. Boissevain H. Borel K. Boyle M. L. Brooks d. S. Brown d. Bucher H. Buesching V. Bumazhnov G. Bunce J. M. Burward-Hoy S. Butsyk S. Campbell J.-S. Chai B. S. Chang J.-L. Charvet S. Chernichenko J. Chiba C. Y. Chi M. Chiu I. J. Choi T. Chujo P. Chung A. Churyn V. Cianciolo C. r. Cleven Y. Cobigo B. A. Cole M. P. Comets P. Constantin M. Csanád T. Csörgő T. dahms K. das G. david M. B. deaton K. dehmelt H. delagrange A. denisov d. d'Enterria A. deshpande E. J. desmond O. dietzsch A. dion M. donadelli J. L. drachenberg O. drapier A. drees A. K. dubey A. durum V. dzhordzhadze Y. V. Efremenko J. Egdemir F. Ellinghaus W. S. Emam A. Enokizono H. En'yo B. Espagnon S. Esumi K. O. Eyser d. E. Fields M. Finger M. Finger,, Jr. F. Fleuret S. L. Fokin B. Forestier Z. Fraenkel J. E. Frantz A. Franz A. d. Frawley K. Fujiwara Y. Fukao S.-Y. Fung T. Fusayasu S. Gadrat I. Garishvili F. Gastineau M. Germain A. Glenn H. Gong M. Gonin J. Gosset Y. Goto r. Greiner de Cassagnac N. Grau S. V. Greene M. Groose Perdekamp T. Gunji H.-Å. Gustafsson T. Hachiya A. Hadj Henni C. Haegemann J. S. Haggerty M. N. Hagiwara H. Hamagaki r. Han H. Harada E. P. Hartouni K. Haruna M. Harvey E. Haslum K. Hasuko r. Hayano M. Heffner T. K. Hemmick T. Hester J. M. Heuser X. He H. Hiejima J. C. Hill r. Hobbs M. Hohlmann M. Holmes W. Holzmann K. Homma B. Hong T. Horaguchi d. Hornback M. G. Hur T. Ichihara K. Imai J. Imrek M. Inaba Y. Inoue d. Isenhower L. Isenhower M. Ishihara T. Isobe M. Issah A. Isupov B. V. Jacak J. Jia J. Jin O. Jinnouchi B. M. Johnson K. S. Joo d. Jouan F. Kajihara S. Kametani N. Kamihara J. Kamin M. Kaneta J. H. Kang H. Kanou T. Kawagi University of Colorado Boulder Colorado 80309 USA Joint Institute for Nuclear Research RU-141980 Dubna Moscow Region Russia Columbia University New York New York 10027 and Nevis Laboratories Irvington New York 10533 USA Chemistry Department Stony Brook University Stony Brook SUNY New York 11794-3400 USA RIKEN The Institute of Physical and Chemical Research Wako Saitama 351-0198 Japan RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA New Mexico State University Las Cruces New Mexico 88003 USA Kyoto University Kyoto 606-8502 Japan SUBATECH (Ecole des Mines de Nantes CNRS-IN2P3 Université de Nantes) BP 20722-44307 Nantes France Brookhaven National Laboratory Upton New York 11973-5000 USA Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS-IN2P3 Route de Saclay F-91128 Palaiseau France Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794 USA Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino RU-142281 Russia Florida Institute of Technology Melbourne Florida 32901 USA Dapnia CEA Saclay F-91191 Gif-sur-Yvette France University of California-Riverside Riverside California 92521 USA Los Alamos National Laboratory Los Alamos New Mexico 87545 USA University of New Mexico Albuquerque New Mexico 87131 USA PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad region RU-188300 Russia Iowa State University Ames Iowa 50011 USA Saint Petersburg State Polytechnic University St. Petersburg Russia Institut für Kernphysik University of Muenster D-48149 Muenster Germany KAERI Cyclotron Application Laboratory Seoul Korea Yonsei University IPAP Seoul 120-749 Korea KEK High Energy Accelerator Research Organization Tsukuba Ibaraki 305-0801 Japan University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA Vanderbilt University Nashville Tennes

The PHENIX experiment has measured the suppression of semi-inclusive single high-transverse-momentum π0's in Au+Au collisions at sNN=200 GeV. The present understanding of this suppression is in terms of energy loss of the parent (fragmenting) parton in a dense color-charge medium. We have performed a quantitative comparison between various parton energy-loss models and our experimental data. The statistical point-to-point uncorrelated as well as correlated systematic uncertainties are taken into account in the comparison. We detail this methodology and the resulting constraint on the model parameters, such as the initial color-charge density dNg/dy, the medium transport coefficient 〈q^〉, or the initial energy-loss parameter ε0. We find that high-transverse-momentum π0 suppression in Au+Au collisions has sufficient precision to constrain these model-dependent parameters at the ±20–25% (one standard deviation) level. These constraints include only the experimental uncertainties, and further studies are needed to compute the corresponding theoretical uncertainties.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Transverse momentum and centrality dependence of dihadron correlations in Au+Au collisions at sNN=200 GeV: Jet quenching and the response of partonic matter

引用

Physical review C 2008年第1期77卷 011901(R)-011901(R)页

作者： A. Adare S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba H. Al-Bataineh J. Alexander A. Al-Jamel K. Aoki L. Aphecetche r. Armendariz S. H. Aronson J. Asai E. T. Atomssa r. Averbeck T. C. Awes B. Azmoun V. Babintsev G. Baksay L. Baksay A. Baldisseri K. N. Barish P. d. Barnes B. Bassalleck S. Bathe S. Batsouli V. Baublis F. Bauer A. Bazilevsky S. Belikov r. Bennett Y. Berdnikov A. A. Bickley M. T. Bjorndal J. G. Boissevain H. Borel K. Boyle M. L. Brooks d. S. Brown d. Bucher H. Buesching V. Bumazhnov G. Bunce J. M. Burward-Hoy S. Butsyk S. Campbell J.-S. Chai B. S. Chang J.-L. Charvet S. Chernichenko J. Chiba C. Y. Chi M. Chiu I. J. Choi T. Chujo P. Chung A. Churyn V. Cianciolo C. r. Cleven Y. Cobigo B. A. Cole M. P. Comets P. Constantin M. Csanád T. Csörgő T. dahms K. das G. david M. B. deaton K. dehmelt H. delagrange A. denisov d. d’Enterria A. deshpande E. J. desmond O. dietzsch A. dion M. donadelli J. L. drachenberg O. drapier A. drees A. K. dubey A. durum V. dzhordzhadze Y. V. Efremenko J. Egdemir F. Ellinghaus W. S. Emam A. Enokizono H. En’yo B. Espagnon S. Esumi K. O. Eyser d. E. Fields M. Finger M. Finger Jr. F. Fleuret S. L. Fokin B. Forestier Z. Fraenkel J. E. Frantz A. Franz A. d. Frawley K. Fujiwara Y. Fukao S.-Y. Fung T. Fusayasu S. Gadrat I. Garishvili F. Gastineau M. Germain A. Glenn H. Gong M. Gonin J. Gosset Y. Goto r. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp T. Gunji H.-Å. Gustafsson T. Hachiya A. Hadj Henni C. Haegemann J. S. Haggerty M. N. Hagiwara H. Hamagaki r. Han H. Harada E. P. Hartouni K. Haruna M. Harvey E. Haslum K. Hasuko r. Hayano M. Heffner T. K. Hemmick T. Hester J. M. Heuser X. He H. Hiejima J. C. Hill r. Hobbs M. Hohlmann M. Holmes W. Holzmann K. Homma B. Hong T. Horaguchi d. Hornback M. G. Hur T. Ichihara K. Imai M. Inaba Y. Inoue d. Isenhower L. Isenhower M. Ishihara T. Isobe M. Issah A. Isupov B. V. Jacak J. Jia J. Jin O. Jinnouchi B. M. Johnson K. S. Joo d. Jouan F. Kajihara S. Kametani N. Kamihara J. Kamin M. Kaneta J. H. Kang H. Kanou T. Kawagishi d. Kawa University of Colorado Boulder Colorado 80309 USA Joint Institute for Nuclear Research Moscow Region RU-141980 Dubna Russia Columbia University New York New York 10027 and Nevis Laboratories Irvington New York 10533 USA Chemistry Department Stony Brook University SUNY Stony Brook New York 11794-3400 USA RIKEN The Institute of Physical and Chemical Research Wako Saitama 351-0198 Japan RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA New Mexico State University Las Cruces New Mexico 88003 USA Kyoto University Kyoto 606-8502 Japan SUBATECH (Ecole des Mines de Nantes CNRS-IN2P3 Université de Nantes) BP 20722-44307 Nantes France Brookhaven National Laboratory Upton New York 11973-5000 USA Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS-IN2P3 Route de Saclay F-91128 Palaiseau France Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794 USA Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino RU-142281 Russia Florida Institute of Technology Melbourne Florida 32901 USA Dapnia CEA Saclay F-91191 Gif-sur-Yvette France University of California–Riverside Riverside California 92521 USA Los Alamos National Laboratory Los Alamos New Mexico 87545 USA University of New Mexico Albuquerque New Mexico 87131 USA PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad Region RU-188300 Russia Iowa State University Ames Iowa 50011 USA Saint Petersburg State Polytechnic University Saint Petersburg Russia Institut für Kernphysik University of Muenster D-48149 Muenster Germany KAERI Cyclotron Application Laboratory Seoul Korea Yonsei University IPAP Seoul 120-749 Korea KEK High Energy Accelerator Research Organization Tsukuba Ibaraki 305-0801 Japan University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA Vanderbilt University Nashville Tennes

Azimuthal angle (Δϕ) correlations are presented for charged hadrons from dijets for 0.4<pT<10 GeV/c in Au+Au collisions at sNN=200 GeV. With increasing pT, the away-side distribution evolves from a broad and re...

Azimuthal angle (Δϕ) correlations are presented for charged hadrons from dijets for 0.4reasing pT, the away-side distribution evolves from a broad and relatively flat shape to a concave shape, then to a convex shape. Comparisons to p+p data suggest that the away-side can be divided into a partially suppressed “head” region centered at Δϕ~π and an enhanced “shoulder” region centered at Δϕ~π±1.1. The pT spectrum for the head region softens toward central collisions, consistent with the onset of jet quenching. The spectral slope for the shoulder region is independent of centrality and trigger pT, which offers constraints on energy transport mechanisms and suggests that it contains the medium response to energetic jets.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Interactive buffer sizing for core routers

Interactive buffer sizing for core routers

引用

IET International Conference on Wireless Mobile and Multimedia Networks Proceedings, ICWMMN 2006

作者： Han, Qiu Yufeng, Li Jiangxing, Wu National Digital Switching System Engineering and Technological R and D Center No.7 Jianxue St. Wenhua Rd. Zhengzhou 450002 China

ISBN: (纸本)0863416446

At present, buffer sizing for routers is generally based on the model of transmission control protocol (TCP) on the transmission layer, ignoring the interaction of the network elements and having its connate limitation as for analyzing the performance for the routers on the network layer. How the routers interact in the network and how can we design the routers practically? From the perspective of the network layer, a new model, introducing the effects brought by each router, is proposed for a TCP link. By comparing the impact of access routers with the impact of core routers on link performance and analyzing the part of core routers with the separate method, a lower bound of required buffer size for an interface of a core router is deduced under given constraints on the maximum loss rate and minimum effective utilization. The simulation results validate the conclusion and also indicate this lower bound for buffer size is much looser than the actual lower bound. Our conclusion is a valuable instruction for practically designing buffer size for core routers.

关键词： routers

来源：评论

学校读者我要写书评

暂无评论

High performance simulation platform for CICQ switches

High performance simulation platform for CICQ switches

引用

2006 International Conference on Communication technology, ICCT '06

作者： Hongchao, Hu Yunfei, Guo Lin, Pang Hongyi, Yu National Digital Switching System Engineering and Technological R and D Center Information Engineering University Zhengzhou Henan China Department of Communication Engineering Information Engineering University Zhengzhou Henan China

ISBN: (纸本)1424408016

Queuing mechanisms and scheduling policies play significant roles in guaranteeing performances of core routers and assured QoS (Quality of Service) for different traffic in today's internet. Based on current buffered crossbar switching fabric, by employing system level design method and objective oriented technology, we design and implement a simulation platform for queuing mechanisms and scheduling policies' development. Inheritability and extensibility attributes are obtained by designing traffic sources, queuing mechanisms and management policies separately. Besides, it can carry out end to end performances' evaluation with little modification. Finally in this article, we present some simulation results for existing scheduling policies, displaying the good performances of our platform.

关键词： switching systems

来源：评论

学校读者我要写书评

暂无评论

An extension of HAVE message in BitTorrent systems

An extension of HAVE message in BitTorrent systems

引用

2006 International Conference on Communication technology, ICCT '06

作者： Jianyong, Li daoying, Huang Jianhua, Huang Chengren, Liang Jianchun, Li Jie, Zhang School of Computer and Communication Engineering Zhengzhou Institute of Light Industry Zhengzhou Henan China National Digital Switching System Engineering and Technological R and D Center Zhengzhou Henan China

ISBN: (纸本)1424408016

In BitTorrent systems, there are eleven types of messages for data communication between the peers, among which HAVE, rEQUEST and PIECE messages are the three main transmission parts in terms of quantity and flow. In order to improve the efficiency of network transmission and decrease the management costs of file delivery, this paper investigates the mechanism of HAVE message of BitTorrent systems and propose a novel MultiHave message scheme. Experiment results show that under the environment of high bandwidth and consistent peers, together with assistant of the timer, the flow ratio of MultiHave message to HAVE message can be reduced to 11%, so MultiHave message can decrease the flow of messages and prevent the HAVE message storm efficiently. Furthermore, MultiHave message can adapt itself to various BT systems with various bandwidths. If the action of network peers is inconsistent, it can degenerate to the original HAVE message and keep the high performance of BitTorrent systems.

关键词： data communication equipment

来源：评论

学校读者我要写书评

暂无评论

Hardware-and-software-based security architecture for broadband router 8th

引用

8th International Conference on Information and Communications Security, ICICS 2006

作者： Xiaozhuo, Gu Yufeng, Li Jianzu, Yang Julong, Lan National Digital Switching System Engineering & Technological R&D Center China Lanzhou City College China Information Engineering University China No 783 Po Box 1001 Henan450002 China

ISBN: (纸本)9783540494966

Implementing IP security in broadband router without sacrificing the performance is main work we focused on. To meet the need of protecting wire speed forwarding data passing through fast path of the router, security module implemented with encryption chip was adopted;to protect non real time data passing through slow path of the router, the scheme of implementing IP security inside kernel of Master control module with software was introduced. Security architecture and several testing architectures were finely designed and depicted in the paper. Testing of security architecture was undergone in Sr1880s router, which was developed by national digital switching system engineering & Technological r&d center of China (NdSC). Testing results show that the two schemes work well together. © Springer-Verlag Berlin Heidelberg 2006.

关键词： Cryptography

来源：评论

学校读者我要写书评

暂无评论

region-based Shape representation and Similarity Measure Suitable for Binary Image retrieval

Region-based Shape Representation and Similarity Measure Sui...

引用

2006 8th International Conference on Signal Processing

作者： Chunmu Huang Lili Zhou Xinwei Wang National Digital Switching System Engineering ＆ Technological R＆D Center（NDSC）

＜正＞Shape is a very important visual and semantic feature used to describe image,and it can be revealed by image pixels’ regional *** binary image,this paper proposes a region-based shape representation,a new "density distribution feature（ddF）",which uses a two-dimensional matrix to express the dimensional distribution information of the object’s pixels within binary *** matching the similarity,we first use the Gaussian model to normalize the two dimensional feature vectors,then integrate them to calculate similarity *** experiments results show that this shape feature can depict image well and is invariant to translation,scale and *** paper also evaluates the effectiveness of the proposed descriptor with respect to Moment Invariants.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Comparability determination of Curved Surface Based on Gaussian Curvature and Normal Vector

Comparability Determination of Curved Surface Based on Gauss...

引用

2006 8th International Conference on Signal Processing

作者： Wuying Feng Xijian Ping Liang Miao National Digital Switching System Engineering & Technological R&D Center(NDSC)

The shape feature of stereo bare footprints,with the ability to reflect human physical and behavior features with uniqueness,has been applied successfully in forensic *** paper proposes a me

关键词：

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：