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2006 8th International Conference on Signal Processing

作者： Yongjun Zhao Meijun Fan Zhihong ding Dept of Electronic Engineering Beijing Institute of Technology National Digital Switching System Engineering & Technological R&D Center

This paper thoroughly analyses the MUSIC-LIKE algorithm based on the fourth order cumulant and the principle of uniform linear array *** improved algorithm is presented that can convert the fourth cumulant matrix of M×M into the （2M -1）×（2W -1） *** method keeps the amount of the virtual element of MUSIC-LIKE algorithm to uniform linear array and eliminates massive redundant data as *** simulations show that the extension ability of this method is the same as MUSIC-LIKE and that the method reduces the time and computation cost.

关键词： Gaussian An Improved Algorithm for Uniform Linear Array Based on the Fourth-order Cumulant

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Emulating Output Queuing with Buffered Crossbar

Emulating Output Queuing with Buffered Crossbar

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2006 International Conference on Communications,Circuits and systems(第四届国际通信、电路与系统学术会议)

作者： Peng Yi Binqiang Wang Han Qiu Hui Li National Digital Switching System Engineering & Technology R&D Center (NDSC) Zhengzhou Henan P.R.C National Digital Switching System Engineering & Technology R&D Center (NDSC) Zhengzhou Henan P.R.C School of Computer & Information Engineering Shenzhen Graduate School Peking University Shenzhen

Output queuing is well known for its ability to provide Quality-of-Service (QoS) guarantees. Unfortunately, the high-speed memory requirements of output queued (OQ) switch limit its use for large capacity switching architecture. A lot of work in literature has investigated how to emulate OQ switch with other switch architectures. A novel approach is constructing switches with buffered crossbars. However, most of the presented schemes still need a mild speedup which will incur significant cost for high speed network application. This paper investigates how to build a buffered crossbar switch to emulate OQ switch with no speedup. We first present a 2-dimensional buffered crossbar as a switch fabric and prove that a combined input-crosspoint-output queued (CICOQ) switch with such a fabric can emulate a restrict PIFO-OQ switch with no speedup. Then, we present a pretreatment mechanism used in scheduling input queues. With such a pretreatment mechanism, the CICOQ switch is proved to be able to emulate a general PIFO-OQ switch with no speedup. All scheduling algorithms used in proving OQ emulation are distributed, hence are practical.

关键词： Switches Quality of service Fabrics Scheduling algorithm research and development Costs High-speed networks Telecommunication traffic Traffic control switching systems

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Implementation of IPSec in High Performance router

Implementation of IPSec in High Performance router

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6th International Conference on ITS Telecommunications Proceedings

作者： Gu Xiao-zhuo Yang Jian-zu Lan Ju-long National Digital Switching System Engineering and Technological R and D Center China 450002 Henan No 783 Po Box 1001 China Lanzhou Teacher's College China 450002 Henan No 783 Po Box 1001 China University of Information Engineering China 450002 Henan No 783 Po Box 1001 China

ISBN: (纸本)0780395867

To meet the security need in high performance router, specific hardware supporting IPSec protocol must be designed. We give the detailed design including hardware and software of implementing IPSec in the high performance router. The aim of the design is to provide the trustiness security without sacrificing the performance of the router and enables the router capable of performing the cryptographic requirements of both AH and ESP mechanisms in transport and tunnel mode.

关键词： Internet protocols

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Effects of sputtering power and annealing temperature on the properties of Sc-doped ZnO thin films

Effects of sputtering power and annealing temperature on the...

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2006 MrS Spring Meeting

作者： Shiao, Ming-Hua Jaing, Cheng-Chung Huang, Yu-Jia Su, Chien-Ying Lu, Chih-Jung Planning and Promotion Division Instrument Technology Research Center National Applied Research Laboratories 20 R and D Road VI Hsinchu 300 Taiwan Department of Optoelectronic System Engineering Ming Hsin University of Science and Technology No. 1 Hsin Hsin Road Hsin Feng Hsinchu 304 Taiwan Department of Electronic Engineering Ming Hsin University of Science and Technology No. 1 Hsin Hsin Road Hsin Feng Hsinchu 304 Taiwan Vacuum Technology Division Instrument Technology Research Center National Applied Research Laboratories 20 R and D Road VI Hsinchu 300 Taiwan Department of Materials Engineering National Chung Hsing University 250 Kuo Kuang Rd. Taichung 402 Taiwan

ISBN: (纸本)1558998853

Sc-doped ZnO thin films were deposited on Corning 1737 glasses by using rF magnetron co-sputtering system with Sc2O3 and ZnO targets. different sputtering powers of Sc2O3 target and post annealing of 550°C for 2 hr were investigated to understand the effect on microstructural, optical and electrical properties of Sc-doped ZnO thin films. From X-ray diffraction (Xrd) results, the Sc-doped films have (002) preferred orientation. Cross-sectional scanning electron microscope (SEM) show that the Sc-doped ZnO thin films have columnar structure before and after annealing procedure. Atomic force microscopy (AFM) surface measurement also shows that the surface roughness of the films was smoother when the Sc2O 3 sputtering power increased. The optical transmission of as deposited Sc-doped films in the visible region all exceeded 80%, and increased about 3% after samples annealed. Electrical resistivity measurement reveals that the as-deposited Sc-doped ZnO thin films had lowest resistivity of 0.97 Ω cm when the Sc2O3 sputtering power was 125W. After annealing the lowest resistivity decreased to 9.85 × 102 Ω cm in which 200W of the Sc2O3 sputtering power was applied. © 2006 Materials research Society.

关键词： Glass

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Macromol. Chem. Phys. 16/2007

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Macromolecular Chemistry and Physics 2007年第16期208卷

作者： Mi‐Jeong Kim Jaedong Lee Chaemin Chun dong‐Yu Kim Seiji Higuchi Tomonobu Nakayama International Center for Young Scientists National Institute for Materials Science (NIMS) 1‐1 Namiki Tsukuba Ibaraki 305‐0044 Japan School of Materials Science Japan Advanced Institute of Science and Technology (JAIST) Ishikawa 923‐1292 Japan Department of Materials Science and Engineering Gwangju Institute of Science and Technology (GIST) 1 Oryong‐dong Buk‐gu Gwangju 500‐712 Republic of Korea Nano System Functionality Center National Institute for Materials Science (NIMS) and the Graduate School of Pure and Applied Sciences University of Tsukuba 1‐1 Namiki Tsukuba Ibaraki 305‐0044 Japan Technology Application R&D Department HORIBA Ltd. 2 Miyanohigashi Kisshoin Minami‐ku Kyoto 601‐8510 Japan Nanometer‐scale Quantum Conductor Array Project JST‐ICORP 4‐1‐8 Honcho Kawaguchi Saitama 332‐0012 Japan

Cover: dynamics of laser‐induced alignment and surface grating formation of azobenzene polymer were examined in relation to the photoisomerization pathway of the excited states. Further details can be found in the Full Paper by M. J. Kim * , J. d. Lee, C. Chun, d. Y. Kim, S. Higuchi, and T. Nakayama on page 1753.

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Piezoresistive Gas Flow Sensors by deep rIE technology

Piezoresistive Gas Flow Sensors by Deep RIE Technology

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IEEE SENSOrS

作者： Young-Tae Lee Kang-Ho Ahn Yong-Taek Kwon Hidekuni Takao Makoto Ishida Department of IT & Electronics Education Andong National University Andong South Korea Mechanical Engineering Hanyang University Seoul South Korea R&D Center HCT Icheon South Korea Intelligent Sensing System Research Center Toyohashi University of Technology Toyohashi Japan

In this paper, we fabricated drag force type gas flow sensor with dry etching technology which used deep rIE (reactive ion etching) and etching stop technology which used SOI (silicon-on-insulator). we fabricated two kinds of sensor, which are cantilever type and paddle type. Both cantilever and paddle type flow sensors have similar sensitivity as 0.03 mV/VldrkPa.

关键词： Piezoresistance Fluid flow Gas detectors dry etching drag Force sensors Biosensors Sensor phenomena and characterization Stress Intelligent sensors

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Evidence for a Long-range Component in the Pion Emission Source in Au+Au Collisions at sNN=200 GeV

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Physical review Letters 2007年第13期98卷 132301-132301页

作者： S. S. Adler S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba J. Alexander r. Amirikas L. Aphecetche S. H. Aronson r. Averbeck T. C. Awes r. Azmoun V. Babintsev A. Baldisseri K. N. Barish P. d. Barnes B. Bassalleck S. Bathe S. Batsouli V. Baublis A. Bazilevsky S. Belikov Y. Berdnikov S. Bhagavatula J. G. Boissevain H. Borel S. Borenstein M. L. Brooks d. S. Brown N. Bruner d. Bucher H. Buesching V. Bumazhnov G. Bunce J. M. Burward-Hoy S. Butsyk X. Camard J.-S. Chai P. Chand W. C. Chang S. Chernichenko C. Y. Chi J. Chiba M. Chiu I. J. Choi J. Choi r. K. Choudhury T. Chujo P. Chung V. Cianciolo Y. Cobigo B. A. Cole P. Constantin M. Csanád T. Csörgő d. d’Enterria G. david H. delagrange A. denisov A. deshpande E. J. desmond A. devismes O. dietzsch O. drapier A. drees r. du rietz A. durum d. dutta Y. V. Efremenko K. El Chenawi A. Enokizono H. En’yo S. Esumi L. Ewell d. E. Fields F. Fleuret S. L. Fokin B. d. Fox Z. Fraenkel J. E. Frantz A. Franz A. d. Frawley S.-Y. Fung S. Garpman T. K. Ghosh A. Glenn G. Gogiberidze M. Gonin J. Gosset Y. Goto r. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp W. Guryn H.-Å. Gustafsson T. Hachiya J. S. Haggerty H. Hamagaki A. G. Hansen E. P. Hartouni M. Harvey r. Hayano N. Hayashi X. He M. Heffner T. K. Hemmick J. M. Heuser M. Hibino J. C. Hill W. Holzmann K. Homma B. Hong A. Hoover T. Ichihara V. V. Ikonnikov K. Imai d. Isenhower M. Ishihara M. Issah A. Isupov B. V. Jacak W. Y. Jang Y. Jeong J. Jia O. Jinnouchi B. M. Johnson S. C. Johnson K. S. Joo d. Jouan S. Kametani N. Kamihara J. H. Kang S. S. Kapoor K. Katou S. Kelly B. Khachaturov A. Khanzadeev J. Kikuchi d. H. Kim d. J. Kim d. W. Kim E. Kim G.-B. Kim H. J. Kim E. Kistenev A. Kiyomichi K. Kiyoyama C. Klein-Boesing H. Kobayashi L. Kochenda V. Kochetkov d. Koehler T. Kohama M. Kopytine d. Kotchetkov A. Kozlov P. J. Kroon C. H. Kuberg K. Kurita Y. Kuroki M. J. Kweon Y. Kwon G. S. Kyle r. Lacey V. Ladygin J. G. Lajoie A. Lebedev S. Leckey d. M. Lee S. Lee M. J. Leitch X. H. Li H. Lim A. Litvinenko M. X. Liu Y. Liu C. F. Ma Brookhaven National Laboratory Upton New York 11973-5000 USA Joint Institute for Nuclear Research 141980 Dubna Moscow Region Russia Chemistry Department Stony Brook University SUNY Stony Brook 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 Florida State University Tallahassee Florida 32306 USA SUBATECH (Ecole des Mines de Nantes CNRS-IN2P3 Université de Nantes) BP 20722 - 44307 Nantes 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 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 Columbia University New York New York 10027 USA and Nevis Laboratories Irvington New York 10533 USA PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad Region 188300 Russia RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA Iowa State University Ames Iowa 50011 USA Saint Petersburg State Polytechnic University St. Petersburg Russia Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS-IN2P3 Route de Saclay F-91128 Palaiseau France New Mexico State University Las Cruces New Mexico 88003 USA Lawrence Livermore National Laboratory Livermore California 94550 USA KAERI Cyclotron Application Laboratory Seoul South Korea Bhabha Atomic Research Centre Bombay 400 085 India Institute of Physics Academia Sinica Taipei 11529 Taiwan Yonsei University IPAP Seoul 120-749 Korea Kangnung National

Emission source functions are extracted from correlation functions constructed from charged pions produced at midrapidity in Au+Au collisions at sNN=200 GeV. The source parameters extracted from these functions at low kT give first indications of a long tail for the pion emission source. The source extension cannot be explained solely by simple kinematic considerations. The possible role of a halo of secondary pions from resonance emissions is explored.

关键词： Light emission

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Elliptic Flow for ϕ Mesons and (Anti)deuterons in Au+Au Collisions at sNN=200 GeV

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Physical review Letters 2007年第5期99卷 052301-052301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. 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 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 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 South 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 A

differential elliptic flow (v2) for ϕ mesons and (anti)deuterons (d¯)d is measured for Au+Au collisions at sNN=200 GeV. The v2 for ϕ mesons follows the trend of lighter π± and K± mesons, suggesting that ordinary hadrons interacting with standard hadronic cross sections are not the primary driver for elliptic flow development. The v2 values for (d¯)d suggest that elliptic flow is additive for composite particles. This further validation of the universal scaling of v2 per constituent quark for baryons and mesons suggests that partonic collectivity dominates the transverse expansion dynamics.

关键词： High energy physics

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Measurement of direct Photon Production in p+p Collisions at s=200 GeV

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Physical review Letters 2007年第1期98卷 012002-012002页

作者： S. S. Adler S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba A. Al-Jamel J. Alexander K. Aoki L. Aphecetche r. Armendariz S. H. Aronson r. Averbeck T. C. Awes V. Babintsev A. Baldisseri K. N. Barish P. d. Barnes B. Bassalleck S. Bathe S. Batsouli V. Baublis F. Bauer A. Bazilevsky S. Belikov M. T. Bjorndal J. G. Boissevain H. Borel M. L. Brooks d. S. Brown N. Bruner d. Bucher H. Buesching V. Bumazhnov G. Bunce J. M. Burward-Hoy S. Butsyk X. Camard P. Chand W. C. Chang S. Chernichenko C. Y. Chi J. Chiba M. Chiu I. J. Choi r. K. Choudhury T. Chujo V. Cianciolo Y. Cobigo B. A. Cole M. P. Comets P. Constantin M. Csanád T. Csörgő J. P. Cussonneau d. d’Enterria K. das G. david F. deák H. delagrange A. denisov A. deshpande E. J. desmond A. devismes O. dietzsch J. L. drachenberg O. drapier A. drees A. durum d. dutta V. dzhordzhadze Y. V. Efremenko H. En’yo B. Espagnon S. Esumi d. E. Fields C. Finck F. Fleuret S. L. Fokin B. d. Fox Z. Fraenkel J. E. Frantz A. Franz A. d. Frawley Y. Fukao S.-Y. Fung S. Gadrat M. Germain A. Glenn M. Gonin J. Gosset Y. Goto r. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp H.-Å. Gustafsson T. Hachiya J. S. Haggerty H. Hamagaki A. G. Hansen E. P. Hartouni M. Harvey K. Hasuko r. Hayano X. He M. Heffner T. K. Hemmick J. M. Heuser P. Hidas H. Hiejima J. C. Hill r. Hobbs W. Holzmann K. Homma B. Hong A. Hoover T. Horaguchi T. Ichihara V. V. Ikonnikov K. Imai M. Inaba M. Inuzuka d. Isenhower L. Isenhower M. Ishihara M. Issah A. Isupov B. V. Jacak J. Jia O. Jinnouchi B. M. Johnson S. C. Johnson K. S. Joo d. Jouan F. Kajihara S. Kametani N. Kamihara M. Kaneta J. H. Kang K. Katou T. Kawabata A. V. Kazantsev S. Kelly B. Khachaturov A. Khanzadeev J. Kikuchi d. J. Kim E. Kim G.-B. Kim H. J. Kim E. Kinney A. Kiss E. Kistenev A. Kiyomichi C. Klein-Boesing H. Kobayashi L. Kochenda V. Kochetkov r. Kohara B. Komkov M. Konno d. Kotchetkov A. Kozlov P. J. Kroon C. H. Kuberg G. J. Kunde K. Kurita M. J. Kweon Y. Kwon G. S. Kyle r. Lacey J. G. Lajoie Y. Le Bornec A. Lebedev S. Leckey d. M. Lee M. J. L Brookhaven National Laboratory Upton New York 11973-5000 USA 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 KEK High Energy Accelerator Research Organization Tsukuba Ibaraki 305-0801 Japan RIKEN (The Institute of Physical and Chemical Research) Wako Saitama 351-0198 Japan 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 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 Institut für Kernphysik University of Muenster D-48149 Muenster Germany PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad Region 188300 Russia RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA Iowa State University Ames Iowa 50011 USA Lawrence Livermore National Laboratory Livermore California 94550 USA Bhabha Atomic Research Centre Bombay 400 085 India Institute of Physics Academia Sinica Taipei 11529 Taiwan Yonsei University IPAP Seoul 120-749 Korea 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 Sciences (MTA KFKI RMKI) H-1525 Budapest 1

Cross sections for midrapidity production of direct photons in p+p collisions at the relativistic Heavy Ion Collider (rHIC) are reported for transverse momenta of 35 GeV/c, where the uncertainties of the measurement ... 详细信息

Cross sections for midrapidity production of direct photons in p+p collisions at the relativistic Heavy Ion Collider (rHIC) are reported for transverse momenta of 3ding order perturbative QCd (pQCd) describes the data well for pT>5 GeV/c, where the uncertainties of the measurement and theory are comparable. We also report on the effect of requiring the photons to be isolated from parton jet energy. The observed fraction of isolated photons is well described by pQCd for pT>7 GeV/c.

关键词： Photons

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Centrality dependence of π0 and η Production at Large Transverse Momentum in sNN=200 GeV d+Au Collisions

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Physical review Letters 2007年第17期98卷 172302-172302页

作者： S. S. Adler S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba A. Al-Jamel J. Alexander K. Aoki L. Aphecetche r. Armendariz S. H. Aronson r. Averbeck T. C. Awes V. Babintsev A. Baldisseri K. N. Barish P. d. Barnes B. Bassalleck S. Bathe S. Batsouli V. Baublis F. Bauer A. Bazilevsky S. Belikov M. T. Bjorndal J. G. Boissevain H. Borel M. L. Brooks d. S. Brown N. Bruner d. Bucher H. Buesching V. Bumazhnov G. Bunce J. M. Burward-Hoy S. Butsyk X. Camard P. Chand W. C. Chang S. Chernichenko C. Y. Chi J. Chiba M. Chiu I. J. Choi r. K. Choudhury T. Chujo V. Cianciolo Y. Cobigo B. A. Cole M. P. Comets P. Constantin M. Csanád T. Csörgő J. P. Cussonneau d. d’Enterria K. das G. david F. deák H. delagrange A. denisov A. deshpande E. J. desmond A. devismes O. dietzsch J. L. drachenberg O. drapier A. drees A. durum d. dutta V. dzhordzhadze Y. V. Efremenko H. En’yo B. Espagnon S. Esumi d. E. Fields C. Finck F. Fleuret S. L. Fokin B. d. Fox Z. Fraenkel J. E. Frantz A. Franz A. d. Frawley Y. Fukao S.-Y. Fung S. Gadrat M. Germain A. Glenn M. Gonin J. Gosset Y. Goto r. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp H.-Å. Gustafsson T. Hachiya J. S. Haggerty H. Hamagaki A. G. Hansen E. P. Hartouni M. Harvey K. Hasuko r. Hayano X. He M. Heffner T. K. Hemmick J. M. Heuser P. Hidas H. Hiejima J. C. Hill r. Hobbs W. Holzmann K. Homma B. Hong A. Hoover T. Horaguchi T. Ichihara V. V. Ikonnikov K. Imai M. Inaba M. Inuzuka d. Isenhower L. Isenhower M. Ishihara M. Issah A. Isupov B. V. Jacak J. Jia O. Jinnouchi B. M. Johnson S. C. Johnson K. S. Joo d. Jouan F. Kajihara S. Kametani N. Kamihara M. Kaneta J. H. Kang K. Katou T. Kawabata A. V. Kazantsev S. Kelly B. Khachaturov A. Khanzadeev J. Kikuchi d. J. Kim E. Kim G.-B. Kim H. J. Kim E. Kinney A. Kiss E. Kistenev A. Kiyomichi C. Klein-Boesing H. Kobayashi L. Kochenda V. Kochetkov r. Kohara B. Komkov M. Konno d. Kotchetkov A. Kozlov P. J. Kroon C. H. Kuberg G. J. Kunde K. Kurita M. J. Kweon Y. Kwon G. S. Kyle r. Lacey J. G. Lajoie Y. Le Bornec A. Lebedev S. Leckey d. M. Lee M. J. L Brookhaven National Laboratory Upton New York 11973-5000 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 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 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 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 Institut für Kernphysik University of Muenster D-48149 Muenster Germany PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad region 188300 Russia RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA Iowa State University Ames Iowa 50011 USA Lawrence Livermore National Laboratory Livermore California 94550 USA Bhabha Atomic Research Centre Bombay 400 085 India Institute of Physics Academia Sinica Taipei 11529 Taiwan Yonsei University IPAP Seoul 120-749 Korea 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 Sciences (MTA KFKI RMKI) H-1525 Budapest 114

The dependence of transverse momentum spectra of neutral pions and η mesons with pT<16 GeV/c and pT<12 GeV/c, respectively, on the centrality of the collision has been measured at midrapidity by the PHENIX experiment at the BNL relativistic Heavy Ion Collider (rHIC) in d+Au collisions at sNN=200 GeV. The measured yields are compared to those in p+p collisions at the same sNN scaled by the number of underlying nucleon-nucleon collisions in d+Au. At all centralities, the yield ratios show no suppression, in contrast to the strong suppression seen for central Au+Au collisions at rHIC. Only a weak pT and centrality dependence can be observed.

关键词： High energy physics

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