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IEEE SoutheastCon 2007

作者： Liu, Zhenshan Wang, Qingxian Luo, Junyong National Digital Switching System Engineering and Technological R and D Center China

ISBN: (纸本)9781424410286

Most existed distributed topology discovery applications deploy multiple probing hosts throughout the network. Paths are then probed from the individual points and the data later is unified into a single topology graph. This approach relies on the ability to deploy probing hosts throughout the network, which in many cases is not possible. This paper presents MTAS(Multi Tunnel Access system), a system which deploys probing hosts in a single IPv4 subnet. Each probing host creates an IPv6 over IPv4 tunnel to reach an ISATAP (Intra-Site Automatic Tunnel Addressing Protocol) or 6to4 relay router which distributed in the world and provides service for public. In MTAS, ISATAP and 6to4 relay routers just work like probing springboards distributed in different location for IPv6 network topology discovery, so MTAS is a handy distributed application. To avoid retracing the same traceroute paths, MTAS system deploys a middle database to store the collected path. We also present some preliminary test results from probing CErNET2, the largest native IPv6 network in China. And the test results illustrate the effectiveness of MTAS.

关键词： probing springboard IPv6 over IPv4 distributed application

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dESIGN ANd EVALUATION OF A PIPELINEd FOrWArdING ENGINE

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Journal of Electronics(China) 2007年第2期24卷 157-162页

作者： Li Yufeng Chen Yue Lan Julong National Digital Switching System Engineering ＆ Technological R ＆D Center Zhengzhou 450002 China

recent advances in broadband technology have caused forwarding engines to handle pack- ets with over 10 gigabit per second. In this paper, we present a high-speed forwarding pipeline which can finish all of the routing and forwarding tasks in the way of pipelining. We also establish the analysis model of the pipeline with which one can evaluate some key performance parameters of the forwarding engine such as forwarding rate and forwarding delay. We find that the pipeline is of good scalability and can forward unicast packets up to the speed of 40Gbit/s.

关键词： design Forwarding engine Pipeline Evaluate

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An efficient and universal security architecture of implementing IPSec in broadband router

An efficient and universal security architecture of implemen...

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IFIP International Conference on Network and Parallel Computing

作者： Gu, Xiaozhuo Yang, Jianzu Yu, Jing Lan, Julong National Digital Switching System Engineering and Technological R and D Center Lanzhou City College China Information Engineering University China

ISBN: (纸本)9780769529431

With the demand of providing data security and integrity, IPSec is implemented in hardware of router to accelerate processing speed. After analyzing advantages and disadvantages of two traditional security architectures, Look-aside architecture and FlowThrough architecture, we propose parallel security processing architecture to achieve better time efficiency. This parallel security architecture adopts mechanism of processing IP packets and IPSec packets simultaneously, which optimizes the processing flow and improves the processing efficiency. The design of parallel security architecture is based on universal architecture of broadband, thus requires minimal change of hardware architecture when implemented in broadband router Testing results based on Sr1880s routers demonstrate that the proposed parallel security architecture is efficient and satisfies the security need of broadband networks.

关键词： routers

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Gluon-Spin Contribution to the Proton Spin from the double-Helicity Asymmetry in Inclusive π0 Production in Polarized p+p Collisions at s=200 GeV

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Physical review Letters 2009年第1期103卷 012003-012003页

作者： A. Adare S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba H. Al-Bataineh J. Alexander K. Aoki L. Aphecetche J. Asai E. T. Atomssa r. Averbeck T. C. Awes B. Azmoun V. Babintsev M. Bai G. Baksay L. Baksay A. Baldisseri K. N. Barish P. d. Barnes B. Bassalleck A. T. Basye S. Bathe S. Batsouli V. Baublis C. Baumann A. Bazilevsky S. Belikov r. Bennett A. Berdnikov Y. Berdnikov A. A. Bickley J. G. Boissevain H. Borel K. Boyle M. L. Brooks H. Buesching V. Bumazhnov G. Bunce S. Butsyk C. M. Camacho S. Campbell P. Chand B. S. Chang W. C. Chang J.-L. Charvet S. Chernichenko C. Y. Chi M. Chiu I. J. Choi r. K. Choudhury T. Chujo P. Chung A. Churyn V. Cianciolo Z. Citron B. A. Cole P. Constantin M. Csanád T. Csörgő T. dahms S. dairaku K. das G. david A. denisov d. d’Enterria A. deshpande E. J. desmond O. dietzsch A. dion M. donadelli O. drapier A. drees K. A. drees A. K. dubey A. durum d. dutta V. dzhordzhadze Y. V. Efremenko J. Egdemir F. Ellinghaus T. Engelmore A. Enokizono H. En’yo S. Esumi K. O. Eyser B. Fadem d. E. Fields M. Finger M. Finger, Jr. F. Fleuret S. L. Fokin Z. Fraenkel J. E. Frantz A. Franz A. d. Frawley K. Fujiwara Y. Fukao T. Fusayasu I. Garishvili 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 A. Hadj Henni J. S. Haggerty H. Hamagaki r. Han E. P. Hartouni K. Haruna E. Haslum r. Hayano M. Heffner T. K. Hemmick T. Hester X. He J. C. Hill M. Hohlmann W. Holzmann K. Homma B. Hong T. Horaguchi d. Hornback S. Huang T. Ichihara r. Ichimiya Y. Ikeda K. Imai J. Imrek M. Inaba d. Isenhower M. Ishihara T. Isobe M. Issah A. Isupov d. Ivanischev B. V. Jacak J. Jia J. Jin B. M. Johnson K. S. Joo d. Jouan F. Kajihara S. Kametani N. Kamihara J. Kamin J. H. Kang J. Kapustinsky d. Kawall A. V. Kazantsev T. Kempel A. Khanzadeev K. M. Kijima J. Kikuchi B. I. Kim d. H. Kim d. J. Kim E. Kim S. H. Kim E. Kinney K. Kiriluk A. Kiss E. Kistenev J. Klay C. Klein-Boesing L. Kochenda V. Kochetkov B. Komkov M. Konno J. Koster A. Kozlov A. Král A. Krav University of Colorado Boulder Colorado 80309 USA Joint Institute for Nuclear Research 141980 Dubna Moscow Region Russia Department of Physics University of Massachusetts Amherst Massachusetts 01003-9337 USA Chemistry Department Stony Brook University Stony Brook SUNY New York 11794-3400 USA RIKEN Nishina Center for Accelerator-Based Science 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 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 Physics Department Brookhaven National Laboratory Upton New York 11973-5000 USA IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino 142281 Russia Collider-Accelerator Department Brookhaven National Laboratory Upton New York 11973-5000 USA 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 Abilene Christian University Abilene Texas 79699 USA PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad region 188300 Russia Institut für Kernphysik University of Muenster D-48149 Muenster Germany Saint Petersburg State Polytechnic University Saint Petersburg Russia Bhabha Atomic Research Centre Bombay 400 085 India Yonsei University IPAP Seoul 120-749 Korea Institute of Physics Academia Sinica Taipei 11529 Taiwan Columbia University New Y

The double helicity asymmetry in neutral pion production for pT=1 to 12 GeV/c was measured with the PHENIX experiment to access the gluon-spin contribution, ΔG, to the proton spin. Measured asymmetries are consistent with zero, and at a theory scale of μ2=4 GeV2 a next to leading order QCd analysis gives ΔG[0.02,0.3]=0.2, with a constraint of −0.7<ΔG[0.02,0.3]<0.5 at Δχ2=9 (∼3σ) for the sampled gluon momentum fraction (x) range, 0.02 to 0.3. The results are obtained using predictions for the measured asymmetries generated from four representative fits to polarized deep inelastic scattering data. We also consider the dependence of the ΔG constraint on the choice of the theoretical scale, a dominant uncertainty in these predictions.

关键词： Inelastic scattering

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Charged Kaon Interferometric Probes of Space-Time Evolution in Au+Au Collisions at sNN=200 GeV

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Physical review Letters 2009年第14期103卷 142301-142301页

作者： S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba J. Alexander A. Al-Jamel K. Aoki L. Aphecetche r. Armendariz S. H. Aronson r. Averbeck T. C. Awes B. Azmoun V. Babintsev 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 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 S. Chernichenko J. Chiba C. Y. Chi M. Chiu I. J. Choi T. Chujo 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 H. delagrange A. denisov d. d’Enterria A. deshpande E. J. desmond O. dietzsch A. dion J. L. drachenberg O. drapier A. drees A. K. dubey A. durum V. dzhordzhadze Y. V. Efremenko J. Egdemir A. Enokizono H. En’yo B. Espagnon S. Esumi d. E. Fields F. Fleuret S. L. Fokin B. Forestier Z. Fraenkel J. E. Frantz A. Franz A. d. Frawley Y. Fukao S.-Y. Fung S. Gadrat F. Gastineau M. Germain A. Glenn 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 J. S. Haggerty M. N. Hagiwara H. Hamagaki H. Harada E. P. Hartouni K. Haruna M. Harvey E. Haslum K. Hasuko r. Hayano M. Heffner T. K. Hemmick J. M. Heuser X. He H. Hiejima J. C. Hill r. Hobbs M. Holmes W. Holzmann K. Homma B. Hong T. Horaguchi M. G. Hur T. Ichihara K. Imai M. Inaba 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 M. Kaneta J. H. Kang T. Kawagishi A. V. Kazantsev S. Kelly A. Khanzadeev d. J. Kim E. Kim Y.-S. Kim E. Kinney Á. Kiss E. Kistenev A. Kiyomichi C. Klein-Boesing L. Kochenda V. Kochetkov B. Komkov M. Konno d. Kotchetkov A. Kozlov P. J. Kroon G. J. Kunde N. Kurihara K. Kurita M. J. Kweon Y. Kwon G. S. Kyle r. Lacey J. G. Lajoie A. Lebedev Y. Le Bornec S. Leckey d. M. Lee M. K. Lee M. J. Leit Joint Institute for Nuclear Research 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 Stony Brook SUNY New York 11794-3400 USA RIKEN Nishina Center for Accelerator-Based Science 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 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 142281 Russia 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 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 KEK High Energy Accelerator Research Organization Tsukuba Ibaraki 305-0801 Japan Yonsei University IPAP Seoul 120-749 Korea Vanderbilt University Nashville Tennessee 37235 USA Georgia State University Atlanta Georgia 30303 USA IPN-Orsay Universite Paris Sud CNRS-IN2P3 BP1 F-91406 Orsay France ELTE Eötvös Loránd University H-1117 Budapest Pázmány P. s. 1/A Hungary KFKI Research Institute for Particle and Nuclear Physics of the Hungarian Academy

Bose-Einstein correlations of charged kaons are used to probe Au+Au collisions at sNN=200 GeV and are compared to charged pion probes, which have a larger hadronic scattering cross section. Three-dimensional Gaussian source radii are extracted, along with a one-dimensional kaon emission source function. The centrality dependences of the three Gaussian radii are well described by a single linear function of Npart1/3 with a zero intercept. Imaging analysis shows a deviation from a Gaussian tail at r≳10 fm, although the bulk emission at lower radius is well described by a Gaussian. The presence of a non-Gaussian tail in the kaon source reaffirms that the particle emission region in a heavy-ion collision is extended, and that similar measurements with pions are not solely due to the decay of long-lived resonances.

关键词： Heavy ions

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Measurement of Bottom Versus Charm as a Function of Transverse Momentum with Electron-Hadron Correlations in p+p Collisions at s=200 GeV

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Physical review Letters 2009年第8期103卷 082002-082002页

作者： A. Adare S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba H. Al-Bataineh J. Alexander K. Aoki L. Aphecetche r. Armendariz S. H. Aronson J. Asai E. T. Atomssa r. Averbeck T. C. Awes B. Azmoun V. Babintsev M. Bai G. Baksay L. Baksay A. Baldisseri K. N. Barish P. d. Barnes B. Bassalleck A. T. Basye S. Bathe S. Batsouli V. Baublis C. Baumann A. Bazilevsky S. Belikov r. Bennett A. Berdnikov Y. Berdnikov A. A. Bickley J. G. Boissevain H. Borel K. Boyle M. L. Brooks H. Buesching V. Bumazhnov G. Bunce S. Butsyk C. M. Camacho S. Campbell 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 Z. Citron C. r. Cleven B. A. Cole M. P. Comets P. Constantin M. Csanád T. Csörgő T. dahms S. dairaku 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 O. drapier A. drees K. A. drees A. K. dubey A. durum d. dutta V. dzhordzhadze Y. V. Efremenko J. Egdemir F. Ellinghaus W. S. Emam T. Engelmore A. Enokizono H. En’yo S. Esumi K. O. Eyser B. Fadem d. E. Fields M. Finger, Jr. M. Finger F. Fleuret S. L. Fokin Z. Fraenkel J. E. Frantz A. Franz A. d. Frawley K. Fujiwara Y. Fukao T. Fusayasu S. Gadrat I. Garishvili 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 H. Harada E. P. Hartouni K. Haruna E. Haslum r. Hayano M. Heffner T. K. Hemmick T. Hester X. He H. Hiejima J. C. Hill r. Hobbs M. Hohlmann W. Holzmann K. Homma B. Hong T. Horaguchi d. Hornback S. Huang T. Ichihara r. Ichimiya Y. Ikeda K. Imai J. Imrek M. Inaba Y. Inoue d. Isenhower L. Isenhower M. Ishihara T. Isobe M. Issah A. Isupov d. Ivanischev 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 J. Kapustinsky d. Kawall A. V. Kazantsev T. Kempel A. Khanza University of Colorado Boulder Colorado 80309 USA Joint Institute for Nuclear Research 141980 Dubna Moscow Region Russia Columbia University New York New York 10027 and Nevis Laboratories Irvington New York 10533 USA Department of Physics University of Massachusetts Amherst Massachusetts 01003-9337 USA Chemistry Department Stony Brook University Stony Brook SUNY New York 11794-3400 USA RIKEN Nishina Center for Accelerator-Based Science 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 Physics Department 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 142281 Russia Collider-Accelerator Department Brookhaven National Laboratory Upton New York 11973-5000 USA 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 Abilene Christian University Abilene Texas 79699 USA PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad region 188300 Russia Institut für Kernphysik University of Muenster D-48149 Muenster Germany Saint Petersburg State Polytechnic University St. Petersburg Russia Yonsei University IPAP Seoul 120-749 Korea Institute of Physics Academia Sinica Ta

The momentum distribution of electrons from semileptonic decays of charm and bottom quarks for midrapidity |y|<0.35 in p+p collisions at s=200 GeV is measured by the PHENIX experiment at the relativistic Heavy Ion Collider over the transverse momentum range 2ratio of the yield of electrons from bottom to that from charm is presented. The ratio is determined using partial d/d¯→e±K∓X (K unidentified) reconstruction. It is found that the yield of electrons from bottom becomes significant above 4 GeV/c in pT. A fixed-order-plus-next-to-leading-log perturbative quantum chromodynamics calculation agrees with the data within the theoretical and experimental uncertainties. The extracted total bottom production cross section at this energy is σbb¯=3.2−1.1+1.2(stat)−1.3+1.4(syst)μb.

关键词： Electrons

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Photon-hadron jet correlations in p+p and Au+Au collisions at sNN=200 GeV

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Physical review C 2009年第2期80卷 024908-024908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 M. Bai G. Baksay L. Baksay A. Baldisseri K. N. Barish P. d. Barnes B. Bassalleck A. T. Basye S. Bathe S. Batsouli V. Baublis F. Bauer C. Baumann A. Bazilevsky S. Belikov r. Bennett A. Berdnikov 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 C. M. Camacho S. Campbell J.-S. Chai B. S. Chang W. C. Chang J.-L. Charvet C.-H. Chen S. Chernichenko J. Chiba C. Y. Chi M. Chiu I. J. Choi r. K. Choudhury T. Chujo P. Chung A. Churyn V. Cianciolo Z. Citron C. r. Cleven Y. Cobigo B. A. Cole M. P. Comets M. Connors P. Constantin M. Csanád T. Csörgő T. dahms S. dairaku 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 K. A. drees A. K. dubey A. durum d. dutta V. dzhordzhadze Y. V. Efremenko J. Egdemir F. Ellinghaus W. S. Emam T. Engelmore A. Enokizono H. En'yo B. Espagnon S. Esumi K. O. Eyser B. Fadem d. E. Fields M. Finger, Jr. M. Finger 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 S. Huang M. G. Hur T. Ichihara r. Ichimiya Y. Ikeda K. Imai J. Imrek M. Inaba Y. Inoue d. Isenhower L. Isenho University of Colorado Boulder Colorado 80309 USA Joint Institute for Nuclear Research RU-141980 Dubna Moscow Region Russia Columbia University New York NY 10027 and Nevis Laboratories Irvington New York 10533 USA Department of Physics University of Massachusetts Amherst Massachusetts 01003-9337 USA Chemistry Department Stony Brook University Stony Brook SUNY New York 11794-3400 USA RIKEN Nishina Center for Accelerator-Based Science 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 Physics Department 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 Collider-Accelerator Department Brookhaven National Laboratory Upton New York 11973-5000 USA 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 Abilene Christian University Abilene Texas 79699 USA PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad region RU-188300 Russia Institut für Kernphysik University of Muenster D-48149 Muenster Germany Iowa State University Ames Iowa 50011 USA Saint Petersburg State Polytechnic University St. Petersburg Russia KAERI Cyclotron Application Laboratory Se

We report the observation at the relativistic Heavy Ion Collider of suppression of back-to-back correlations in the direct photon+jet channel in Au+Au relative to p+p collisions. Two-particle correlations of direct photon triggers with associated hadrons are obtained by statistical subtraction of the decay photon-hadron (γ−h) background. The initial momentum of the away-side parton is tightly constrained, because the parton-photon pair exactly balance in momentum at leading order in perturbative quantum chromodynamics, making such correlations a powerful probe of the in-medium parton energy loss. The away-side nuclear suppression factor, IAA, in central Au+Au collisions, is 0.32±0.12stat±0.09syst for hadrons of 3dence with photons of 5ression is comparable to that observed for high-pT single hadrons and dihadrons. The direct photon associated yields in p+p collisions scale approximately with the momentum balance, zT≡pTh/pTγ, as expected for a measurement of the away-side parton fragmentation function. We compare to Au+Au collisions for which the momentum balance dependence of the nuclear modification should be sensitive to the path-length dependence of parton energy loss.

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High-pT π0 production with respect to the reaction plane in Au+Au collisions at sNN=200 GeV

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Physical review C 2009年第5期80卷 054907-054907页

作者： S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba J. Alexander A. Al-Jamel K. Aoki L. Aphecetche r. Armendariz S. H. Aronson r. Averbeck T. C. Awes B. Azmoun V. Babintsev 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 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 S. Chernichenko J. Chiba C. Y. Chi M. Chiu I. J. Choi T. Chujo 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 H. delagrange A. denisov d. d’Enterria A. deshpande E. J. desmond O. dietzsch A. dion J. L. drachenberg O. drapier A. drees A. K. dubey A. durum V. dzhordzhadze Y. V. Efremenko J. Egdemir A. Enokizono H. En’yo B. Espagnon S. Esumi d. E. Fields F. Fleuret S. L. Fokin B. Forestier Z. Fraenkel J. E. Frantz A. Franz A. d. Frawley Y. Fukao S. -Y. Fung S. Gadrat F. Gastineau M. Germain A. Glenn 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 J. S. Haggerty M. N. Hagiwara H. Hamagaki H. Harada E. P. Hartouni K. Haruna M. Harvey E. Haslum K. Hasuko r. Hayano M. Heffner T. K. Hemmick J. M. Heuser X. He H. Hiejima J. C. Hill r. Hobbs M. Holmes W. Holzmann K. Homma B. Hong T. Horaguchi M. G. Hur T. Ichihara K. Imai M. Inaba 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 M. Kaneta J. H. Kang T. Kawagishi A. V. Kazantsev S. Kelly A. Khanzadeev d. J. Kim E. Kim Y. -S. Kim E. Kinney Á. Kiss E. Kistenev A. Kiyomichi C. Klein-Boesing L. Kochenda V. Kochetkov B. Komkov M. Konno d. Kotchetkov A. Kozlov P. J. Kroon G. J. Kunde N. Kurihara K. Kurita M. J. Kweon Y. Kwon G. S. Kyle r. Lacey J. G. Lajoie A. Lebedev Y. Le Bornec S. Leckey d. M. Lee M. K. Lee M. J. L 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 Nishina Center for Accelerator-Based Science 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 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 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 KEK High Energy Accelerator Research Organization Tsukuba Ibaraki 305-0801 Japan Yonsei University IPAP Seoul 120-749 Korea Vanderbilt University Nashville Tennessee 37235 USA Georgia State University Atlanta Georgia 30303 USA IPN-Orsay Universite Paris Sud CNRS-IN2P3 BP1 F-91406 Orsay France ELTE Eötvös Loránd University H-1117 Budapest Pázmány P. s. 1/A Hungary KFKI Research Institute for Particle and Nuclear Physics of the Hungarian Academy

Measurements of the azimuthal anisotropy of high-pT neutral pion (π0) production in Au+Au collisions at sNN=200 GeV by the PHENIX experiment are presented. The data included in this article were collected during the 2004 relativistic Heavy Ion Collider running period and represent approximately an order of magnitude increase in the number of analyzed events relative to previously published results. Azimuthal angle distributions of π0 mesons detected in the PHENIX electromagnetic calorimeters are measured relative to the reaction plane determined event-by-event using the forward and backward beam-beam counters. Amplitudes of the second Fourier component (v2) of the angular distributions are presented as a function of π0 transverse momentum (pT) for different bins in collision centrality. Measured reaction plane dependent π0 yields are used to determine the azimuthal dependence of the π0 suppression as a function of pT, rAA(Δϕ,pT). A jet-quenching motivated geometric analysis is presented that attempts to simultaneously describe the centrality dependence and reaction plane angle dependence of the π0 suppression in terms of the path lengths of hypothetical parent partons in the medium. This set of results allows for a detailed examination of the influence of geometry in the collision region and of the interplay between collective flow and jet-quenching effects along the azimuthal axis.

关键词： Planing dEPENdENCE Collisions

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systematic studies of elliptic flow measurements in Au+Au collisions at sNN=200 GeV

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Physical review C 2009年第2期80卷 024909-024909页

作者： S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba J. Alexander A. Al-Jamel K. Aoki L. Aphecetche r. Armendariz S. H. Aronson r. Averbeck T. C. Awes B. Azmoun V. Babintsev 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 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 S. Chernichenko J. Chiba C. Y. Chi M. Chiu I. J. Choi T. Chujo 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 H. delagrange A. denisov d. d'Enterria A. deshpande E. J. desmond O. dietzsch A. dion J. L. drachenberg O. drapier A. drees A. K. dubey A. durum V. dzhordzhadze Y. V. Efremenko J. Egdemir A. Enokizono H. En'yo B. Espagnon S. Esumi d. E. Fields F. Fleuret S. L. Fokin B. Forestier Z. Fraenkel J. E. Frantz A. Franz A. d. Frawley Y. Fukao S. -Y. Fung S. Gadrat F. Gastineau M. Germain A. Glenn 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 J. S. Haggerty M. N. Hagiwara H. Hamagaki H. Harada E. P. Hartouni K. Haruna M. Harvey E. Haslum K. Hasuko r. Hayano M. Heffner T. K. Hemmick J. M. Heuser X. He H. Hiejima J. C. Hill r. Hobbs M. Holmes W. Holzmann K. Homma B. Hong T. Horaguchi M. G. Hur T. Ichihara K. Imai M. Inaba 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 M. Kaneta J. H. Kang T. Kawagishi A. V. Kazantsev S. Kelly A. Khanzadeev d. J. Kim E. Kim Y. -S. Kim E. Kinney A. Kiss E. Kistenev A. Kiyomichi C. Klein-Boesing L. Kochenda V. Kochetkov B. Komkov M. Konno d. Kotchetkov A. Kozlov P. J. Kroon G. J. Kunde N. Kurihara K. Kurita M. J. Kweon Y. Kwon G. S. Kyle r. Lacey J. G. Lajoie A. Lebedev Y. Le Bornec S. Leckey d. M. Lee M. K. Lee M. J. 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 USA RIKEN Nishina Center for Accelerator-Based Science Wako Saitama 351-0198 Japan RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973 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 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 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 KEK High Energy Accelerator Research Organization Tsukuba Ibaraki 305-0801 Japan Yonsei University IPAP Seoul 120-749 Korea Vanderbilt University Nashville Tennessee 37235 USA Georgia State University Atlanta Georgia 30303 USA IPN-Orsay Universite Paris Sud CNRS-IN2P3 BP1 F-91406 Orsay France ELTE Eötvös Loránd University H-1117 Budapest Pázmány P.s. 1/A Hungary KFKI Research Institute for Particle and Nuclear Physics of the Hungarian Academy of Scienc

We present inclusive charged hadron elliptic flow (v2) measured over the pseudorapidity range |η|6.5) pseudorapidities and (2) the two-particle cumulant method extracted using correlations between particles detected ...

We present inclusive charged hadron elliptic flow (v2) measured over the pseudorapidity range |η|<0.35 in Au+Au collisions at sNN=200 GeV. results for v2 are presented over a broad range of transverse momentum (pT=0.2−8.0 GeV/c) and centrality (0–60%). To study nonflow effects that are correlations other than collective flow, as well as the fluctuations of v2, we compare two different analysis methods: (1) the event-plane method from two independent subdetectors at forward (|η|=3.1−3.9) and beam (|η|>6.5) pseudorapidities and (2) the two-particle cumulant method extracted using correlations between particles detected at midrapidity. The two event-plane results are consistent within systematic uncertainties over the measured pT and in centrality 0–40%. There is at most a 20% difference in the v2 between the two event-plane methods in peripheral (40–60%) collisions. The comparisons between the two-particle cumulant results and the standard event-plane measurements are discussed.

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Inclusive cross section and double helicity asymmetry for π0 production in p+p collisions at s=62.4 GeV

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Physical review d 2009年第1期79卷 012003-012003页

作者： A. Adare S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba H. Al-Bataineh J. Alexander K. Aoki L. Aphecetche J. Asai E. T. Atomssa r. Averbeck T. C. Awes B. Azmoun V. Babintsev M. Bai G. Baksay L. Baksay A. Baldisseri K. N. Barish P. d. Barnes B. Bassalleck A. T. Basye S. Bathe S. Batsouli V. Baublis C. Baumann A. Bazilevsky S. Belikov r. Bennett A. Berdnikov Y. Berdnikov A. A. Bickley J. G. Boissevain H. Borel K. Boyle M. L. Brooks H. Buesching V. Bumazhnov G. Bunce S. Butsyk C. M. Camacho S. Campbell P. Chand B. S. Chang W. C. Chang J.-L. Charvet S. Chernichenko C. Y. Chi M. Chiu I. J. Choi r. K. Choudhury T. Chujo P. Chung A. Churyn V. Cianciolo Z. Citron B. A. Cole P. Constantin M. Csanád T. Csörgő T. dahms S. dairaku K. das G. david A. denisov d. d’Enterria A. deshpande E. J. desmond O. dietzsch A. dion M. donadelli O. drapier A. drees K. A. drees A. K. dubey A. durum d. dutta V. dzhordzhadze Y. V. Efremenko J. Egdemir F. Ellinghaus T. Engelmore A. Enokizono H. En’yo S. Esumi K. O. Eyser B. Fadem d. E. Fields M. Finger M. Finger, Jr. F. Fleuret S. L. Fokin Z. Fraenkel J. E. Frantz A. Franz A. d. Frawley K. Fujiwara Y. Fukao T. Fusayasu I. Garishvili 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 A. Hadj Henni J. S. Haggerty H. Hamagaki r. Han E. P. Hartouni K. Haruna E. Haslum r. Hayano M. Heffner T. K. Hemmick T. Hester X. He J. C. Hill M. Hohlmann W. Holzmann K. Homma B. Hong T. Horaguchi d. Hornback S. Huang T. Ichihara r. Ichimiya Y. Ikeda K. Imai J. Imrek M. Inaba d. Isenhower M. Ishihara T. Isobe M. Issah A. Isupov d. Ivanischev B. V. Jacak J. Jia J. Jin B. M. Johnson K. S. Joo d. Jouan F. Kajihara S. Kametani N. Kamihara J. Kamin J. H. Kang J. Kapustinsky d. Kawall A. V. Kazantsev T. Kempel A. Khanzadeev K. M. Kijima J. Kikuchi B. I. Kim d. H. Kim d. J. Kim E. Kim S. H. Kim E. Kinney K. Kiriluk A. Kiss E. Kistenev J. Klay C. Klein-Boesing L. Kochenda V. Kochetkov B. Komkov M. Konno J. Koster A. Kozlov A. Král A. Krav University of Colorado Boulder Colorado 80309 USA Joint Institute for Nuclear Research 141980 Dubna Moscow Region Russia Department of Physics University of Massachusetts Amherst Massachusetts 01003-9337 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 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 Physics Department Brookhaven National Laboratory Upton New York 11973-5000 USA IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino 142281 Russia Collider-Accelerator Department Brookhaven National Laboratory Upton New York 11973-5000 USA 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 Abilene Christian University Abilene Texas 79699 USA PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad region 188300 Russia Institut für Kernphysik University of Muenster D-48149 Muenster Germany Saint Petersburg State Polytechnic University St. Petersburg Russia Bhabha Atomic Research Centre Bombay 400 085 India Yonsei University IPAP Seoul 120-749 Korea Institute of Physics Academia Sinica Taipei 11529 Taiwan Columbia University New

The PHENIX experiment presents results from the rHIC 2006 run with polarized p+p collisions at s=62.4 GeV, for inclusive π0 production at midrapidity. Unpolarized cross section results are measured for transverse momenta pT=0.5 to 7 GeV/c. Next-to-leading order perturbative quantum chromodynamics calculations are compared with the data, and while the calculations are consistent with the measurements, next-to-leading logarithmic corrections improve the agreement. double helicity asymmetries ALL are presented for pT=1 to 4 GeV/c and probe the higher range of Bjorken x of the gluon (xg) with better statistical precision than our previous measurements at s=200 GeV. These measurements are sensitive to the gluon polarization in the proton for 0.06

关键词： Inclusive cross section double helicity asymmetry π0 production Helicity Collisions gluons dOUBLE quantum chromodynamics Cross section peak-to-peak

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