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International Conference on Network-Based Information Systems (NBIS)

作者： Qingyong Li Zhangdui Zhong Zhengping Liang Yong Liang Beijing Key Lab of Transportation Data Analysis and Mining Beijing Jiaotong University Beijing China College of Computer Science and Software Engineering Shenzhen University Communication & Power Utilization Technology Subcompany State Grid Electric Power Research Institute State Grid Beijing China

Rail inspection is one of the most important tasks for rail industry, in order to guarantee the safety of railway systems and control their cost. Rail are systematically inspected for defects using various non-destructive evaluation (NDE) techniques, which include ultrasonic inspection, visual detection, magnetic flux leakage method, acoustic emission inspection etc. The data obtained by these NDE devices are going to increase in both quality and quantity, therefore big data has emerged as a potential challenge for rail inspection. This paper reviews the advanced NDE techniques for rail inspection, and brings forward a new framework of rail inspection based on big data, according to the characteristics of inspection data.

关键词： Rails Inspection Acoustics Surface cracks Visualization Surface treatment big data

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The study of a hierarchical hadoop architecture in multiple data centers environment

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Open Cybernetics and Systemics Journal 2015年第1期9卷 131-137页

作者： Shengtao, Sun Aizhi, Wu Xiaoyang, Liu School of Information Science and Engineering Yanshan University QinhuangdaoHebei066004 China College of Vehicles and Energy Yanshan University QinhuangdaoHebei066004 China Data Industry Research Institute Limited Company QinhuangdaoHebei066004 China Key Laboratory for Computer Virtual Technology and System Integration of Hebei Province QinhuangdaoHebei066004 China

Hadoop is a reasonable tool for cloud computing in big data era and MapReduce paradigm may be a highly successful programming model for large-scale data-intensive computing application, but the conventional MapReduce model and Hadoop framework limit themselves to implement jobs within single cluster. Traditional single-cluster Hadoop may not suitable for situations when data and compute resources are widely distributed this paper focuses on the application of Hadoop across multiple data centers and clusters. A hierarchical distributed computing architecture of Hadoop is designed and the virtual Hadoop file system is proposed to provide global data view across multiple data centers. The job submitted by user can be decomposed automatically into several sub-jobs which are then allocated and executed on corresponding clusters by location-aware manner. The prototype based on this architecture shows encouraging results. © Shengtao et al.

关键词： MapReduce

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Erratum to: Measurements of prompt charm production cross-sections in pp collisions at s = 13 TeV

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Journal of High Energy Physics 2016年第9期2016卷 1-18页

作者： R. Aaij C. Abellán Beteta B. Adeva M. Adinolfi A. Affolder Z. Ajaltouni S. Akar J. Albrecht F. Alessio M. Alexander S. Ali G. Alkhazov P. Alvarez Cartelle A. A. Alves S. Amato S. Amerio Y. Amhis L. An L. Anderlini J. Anderson G. Andreassi M. Andreotti J. E. Andrews R. B. Appleby O. Aquines Gutierrez F. Archilli P. d’Argent A. Artamonov M. Artuso E. Aslanides G. Auriemma M. Baalouch S. Bachmann J. J. Back A. Badalov C. Baesso W. Baldini R. J. Barlow C. Barschel S. Barsuk W. Barter V. Batozskaya V. Battista A. Bay L. Beaucourt J. Beddow F. Bedeschi I. Bediaga L. J. Bel V. Bellee N. Belloli I. Belyaev E. Ben-Haim G. Bencivenni S. Benson J. Benton A. Berezhnoy R. Bernet A. Bertolin M.-O. Bettler M. van Beuzekom A. Bien S. Bifani P. Billoir T. Bird A. Birnkraut A. Bizzeti T. Blake F. Blanc J. Blouw S. Blusk V. Bocci A. Bondar N. Bondar W. Bonivento S. Borghi M. Borsato T. J. V. Bowcock E. Bowen C. Bozzi S. Braun M. Britsch T. Britton J. Brodzicka N. H. Brook E. Buchanan C. Burr A. Bursche J. Buytaert S. Cadeddu R. Calabrese M. Calvi M. Calvo Gomez P. Campana D. Campora Perez L. Capriotti A. Carbone G. Carboni R. Cardinale A. Cardini P. Carniti L. Carson K. Carvalho Akiba G. Casse L. Cassina L. Castillo Garcia M. Cattaneo Ch. Cauet G. Cavallero R. Cenci M. Charles Ph. Charpentier M. Chefdeville S. Chen S.-F. Cheung N. Chiapolini M. Chrzaszcz X. Cid Vidal G. Ciezarek P. E. L. Clarke M. Clemencic H. V. Cliff J. Closier V. Coco J. Cogan E. Cogneras V. Cogoni L. Cojocariu G. Collazuol P. Collins A. Comerma-Montells A. Contu A. Cook M. Coombes S. Coquereau G. Corti M. Corvo B. Couturier G. A. Cowan D. C. Craik A. Crocombe M. Cruz Torres S. Cunliffe R. Currie C. D’Ambrosio E. Dall’Occo J. Dalseno P. N. Y. David A. Davis O. De Aguiar Francisco K. De Bruyn S. De Capua M. De Cian J. M. De Miranda L. De Paula P. De Simone C.-T. Dean D. Decamp M. Deckenhoff L. Del Buono N. Déléage M. Demmer D. Derkach O. Deschamps F. Dettori B. Dey A. Di Canto F. Di Ruscio H. Dijkstra S. Donleavy F. Dordei M. Dorigo A. Dosil Suárez D. Dossett A. European Organization for Nuclear Research (CERN) Geneva Switzerland Physik-Institut Universität Zürich Zürich Switzerland Universidad de Santiago de Compostela Santiago de Compostela Spain H.H. Wills Physics Laboratory University of Bristol Bristol United Kingdom Oliver Lodge Laboratory University of Liverpool Liverpool United Kingdom Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Fakultät Physik Technische Universität Dortmund Dortmund Germany School of Physics and Astronomy University of Glasgow Glasgow United Kingdom Nikhef National Institute for Subatomic Physics Amsterdam The Netherlands Petersburg Nuclear Physics Institute (PNPI) Gatchina Russia Imperial College London London United Kingdom University of Cincinnati Cincinnati United States Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil Sezione INFN di Padova Padova Italy LAL Université Paris-Sud CNRS/IN2P3 Orsay France Center for High Energy Physics Tsinghua University Beijing China Sezione INFN di Firenze Firenze Italy Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne Switzerland Sezione INFN di Ferrara Ferrara Italy Università di Ferrara Ferrara Italy University of Maryland College Park United States School of Physics and Astronomy University of Manchester Manchester United Kingdom Max-Planck-Institut für Kernphysik (MPIK) Heidelberg Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany Institute for High Energy Physics (IHEP) Protvino Russia Syracuse University Syracuse United States Sezione INFN di Roma La Sapienza Roma Italy Università della Basilicata Potenza Italy Department of Physics University of Warwick Coventry United Kingdom Universitat de Barcelona Barcelona Spain Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio) Rio de Janeiro Brazil National Center for Nuclear Research (NCBJ) Warsaw Poland LAPP

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Measurement of transverse energy at midrapidity in Pb-Pb collisions at sNN=2.76 TeV

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Physical Review C 2016年第3期94卷 034903-034903页

作者： J. Adam D. Adamová M. M. Aggarwal G. Aglieri Rinella M. Agnello N. Agrawal Z. Ahammed S. Ahmad S. U. Ahn S. Aiola A. Akindinov S. N. Alam D. S. D. Albuquerque D. Aleksandrov B. Alessandro D. Alexandre R. Alfaro Molina A. Alici A. Alkin J. R. M. Almaraz J. Alme T. Alt S. Altinpinar I. Altsybeev C. Alves Garcia Prado C. Andrei A. Andronic V. Anguelov T. Antičić F. Antinori P. Antonioli L. Aphecetche H. Appelshäuser S. Arcelli R. Arnaldi O. W. Arnold I. C. Arsene M. Arslandok B. Audurier A. Augustinus R. Averbeck M. D. Azmi A. Badalà Y. W. Baek S. Bagnasco R. Bailhache R. Bala S. Balasubramanian A. Baldisseri R. C. Baral A. M. Barbano R. Barbera F. Barile G. G. Barnaföldi L. S. Barnby V. Barret P. Bartalini K. Barth J. Bartke E. Bartsch M. Basile N. Bastid S. Basu B. Bathen G. Batigne A. Batista Camejo B. Batyunya P. C. Batzing I. G. Bearden H. Beck C. Bedda N. K. Behera I. Belikov F. Bellini H. Bello Martinez R. Bellwied R. Belmont E. Belmont-Moreno V. Belyaev G. Bencedi S. Beole I. Berceanu A. Bercuci Y. Berdnikov D. Berenyi R. A. Bertens D. Berzano L. Betev A. Bhasin I. R. Bhat A. K. Bhati B. Bhattacharjee J. Bhom L. Bianchi N. Bianchi C. Bianchin J. Bielčík J. Bielčíková A. Bilandzic G. Biro R. Biswas S. Biswas S. Bjelogrlic J. T. Blair D. Blau C. Blume F. Bock A. Bogdanov H. Bøggild L. Boldizsár M. Bombara J. Book H. Borel A. Borissov M. Borri F. Bossú E. Botta C. Bourjau P. Braun-Munzinger M. Bregant T. Breitner T. A. Broker T. A. Browning M. Broz E. J. Brucken E. Bruna G. E. Bruno D. Budnikov H. Buesching S. Bufalino P. Buncic O. Busch Z. Buthelezi J. B. Butt J. T. Buxton J. Cabala D. Caffarri X. Cai H. Caines L. Calero Diaz A. Caliva E. Calvo Villar P. Camerini F. Carena W. Carena F. Carnesecchi J. Castillo Castellanos A. J. Castro E. A. R. Casula C. Ceballos Sanchez J. Cepila P. Cerello J. Cerkala B. Chang S. Chapeland M. Chartier J. L. Charvet S. Chattopadhyay A. Chauvin V. Chelnokov M. Cherney C. Cheshkov B. Cheynis V. Chibante Barroso D. D. Chinellato S. Cho P. Chochula K. Choi M. Chojnacki S. Choudhury Faculty of Nuclear Sciences and Physical Engineering Czech Technical University in Prague Prague Czech Republic Nuclear Physics Institute Academy of Sciences of the Czech Republic Řež u Prahy Czech Republic Physics Department Panjab University Chandigarh India European Organization for Nuclear Research (CERN) Geneva Switzerland Sezione INFN Turin Italy Indian Institute of Technology Bombay (IIT) Mumbai India Variable Energy Cyclotron Centre Kolkata India Department of Physics Aligarh Muslim University Aligarh India Korea Institute of Science and Technology Information Daejeon South Korea Yale University New Haven Connecticut 06520 USA Institute for Theoretical and Experimental Physics Moscow Russia Universidade Estadual de Campinas (UNICAMP) Campinas Brazil National Research Centre Kurchatov Institute Moscow Russia School of Physics and Astronomy University of Birmingham Birmingham United Kingdom Instituto de Física Universidad Nacional Autónoma de México Mexico City Mexico Centro Fermi-Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi ” Rome Italy Sezione INFN Bologna Italy Bogolyubov Institute for Theoretical Physics Kiev Ukraine Universidad Autónoma de Sinaloa Culiacán Mexico Faculty of Engineering Bergen University College Bergen Norway Department of Physics and Technology University of Bergen Bergen Norway Frankfurt Institute for Advanced Studies Johann Wolfgang Goethe-Universität Frankfurt Frankfurt Germany V. Fock Institute for Physics St. Petersburg State University St. Petersburg Russia Universidade de São Paulo (USP) São Paulo Brazil National Institute for Physics and Nuclear Engineering Bucharest Romania Research Division and ExtreMe Matter Institute EMMI GSI Helmholtzzentrum für Schwerionenforschung Darmstadt Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany Rudjer Bošković Institute Zagreb Croatia Sezione INFN Padova Italy SUBATECH Ecole des Mines de Nantes Université de Nan

We report the transverse energy (ET) measured with ALICE at midrapidity in Pb-Pb collisions at sNN=2.76 TeV as a function of centrality. The transverse energy was measured using identified single-particle tracks. The measurement was cross checked using the electromagnetic calorimeters and the transverse momentum distributions of identified particles previously reported by ALICE. The results are compared to theoretical models as well as to results from other experiments. The mean ET per unit pseudorapidity (η), 〈dET/dη〉, in 0%–5% central collisions is 1737±6(stat.)±97(sys.) GeV. We find a similar centrality dependence of the shape of 〈dET/dη〉 as a function of the number of participating nucleons to that seen at lower energies. The growth in 〈dET/dη〉 at the LHC energies exceeds extrapolations of low-energy data. We observe a nearly linear scaling of 〈dET/dη〉 with the number of quark participants. With the canonical assumption of a 1 fm/c formation time, we estimate that the energy density in 0%–5% central Pb-Pb collisions at sNN=2.76 TeV is 12.3±1.0GeV/fm3 and that the energy density at the most central 80fm2 of the collision is at least 21.5±1.7GeV/fm3. This is roughly 2.3 times that observed in 0%–5% central Au-Au collisions at sNN=200 GeV.

关键词： Quark-gluon plasma Relativistic heavy-ion collisions

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Measurement of the proton-air cross section with Telescope Array’s Middle Drum detector and surface array in hybrid mode

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Physical Review D 2015年第3期92卷 032007-032007页

作者： R. U. Abbasi M. Abe T. Abu-Zayyad M. Allen R. Azuma E. Barcikowski J. W. Belz D. R. Bergman S. A. Blake R. Cady M. J. Chae B. G. Cheon J. Chiba M. Chikawa W. R. Cho T. Fujii M. Fukushima T. Goto W. Hanlon Y. Hayashi N. Hayashida K. Hibino K. Honda D. Ikeda N. Inoue T. Ishii R. Ishimori H. Ito D. Ivanov C. C. H. Jui K. Kadota F. Kakimoto O. Kalashev K. Kasahara H. Kawai S. Kawakami S. Kawana K. Kawata E. Kido H. B. Kim J. H. Kim S. Kitamura Y. Kitamura V. Kuzmin Y. J. Kwon J. Lan S. I. Lim J. P. Lundquist K. Machida K. Martens T. Matsuda T. Matsuyama J. N. Matthews M. Minamino Y. Mukai I. Myers K. Nagasawa S. Nagataki T. Nakamura T. Nonaka A. Nozato S. Ogio J. Ogura M. Ohnishi H. Ohoka K. Oki T. Okuda M. Ono A. Oshima S. Ozawa I. H. Park M. S. Pshirkov D. C. Rodriguez G. Rubtsov D. Ryu H. Sagawa N. Sakurai L. M. Scott P. D. Shah F. Shibata T. Shibata H. Shimodaira B. K. Shin H. S. Shin J. D. Smith P. Sokolsky R. W. Springer B. T. Stokes S. R. Stratton T. A. Stroman T. Suzawa M. Takamura M. Takeda R. Takeishi A. Taketa M. Takita Y. Tameda H. Tanaka K. Tanaka M. Tanaka S. B. Thomas G. B. Thomson P. Tinyakov I. Tkachev H. Tokuno T. Tomida S. Troitsky Y. Tsunesada K. Tsutsumi Y. Uchihori S. Udo F. Urban G. Vasiloff T. Wong R. Yamane H. Yamaoka K. Yamazaki J. Yang K. Yashiro Y. Yoneda S. Yoshida H. Yoshii R. Zollinger Z. Zundel High Energy Astrophysics Institute and Department of Physics and Astronomy University of Utah Salt Lake City Utah USA The Graduate School of Science and Engineering Saitama University Saitama Saitama Japan Graduate School of Science and Engineering Tokyo Institute of Technology Meguro Tokyo Japan Department of Physics and Institute for the Early Universe Ewha Womans University Seodaaemun-gu Seoul Korea Department of Physics and The Research Institute of Natural Science Hanyang University Seongdong-gu Seoul Korea Department of Physics Tokyo University of Science Noda Chiba Japan Department of Physics Kinki University Higashi Osaka Osaka Japan Department of Physics Yonsei University Seodaemun-gu Seoul Korea Institute for Cosmic Ray Research University of Tokyo Kashiwa Chiba Japan Kavli Institute for the Physics and Mathematics of the Universe (WPI) Todai Institutes for Advanced Study The University of Tokyo Kashiwa Chiba Japan Graduate School of Science Osaka City University Osaka Osaka Japan Faculty of Engineering Kanagawa University Yokohama Kanagawa Japan Interdisciplinary Graduate School of Medicine and Engineering University of Yamanashi Kofu Yamanashi Japan Astrophysical Big Bang Laboratory RIKEN Wako Saitama Japan Department of Physics Tokyo City University Setagaya-ku Tokyo Japan Institute for Nuclear Research of the Russian Academy of Sciences Moscow Russia Advanced Research Institute for Science and Engineering Waseda University Shinjuku-ku Tokyo Japan Department of Physics Chiba University Chiba Chiba Japan Department of Physics School of Natural Sciences Ulsan National Institute of Science and Technology UNIST-gil Ulsan Korea Institute of Particle and Nuclear Studies KEK Tsukuba Ibaraki Japan Faculty of Science Kochi University Kochi Kochi Japan Department of Physical Sciences Ritsumeikan University Kusatsu Shiga Japan Department of Physics Kyushu University Fukuoka Fukuoka Japan Engineering Science Laboratory C

In this work we are reporting on the measurement of the proton-air inelastic cross section σp−airinel using the Telescope Array detector. Based on the measurement of the σp−airinel, the proton-proton cross section σp−p value is also determined at s=95−8+5 TeV. Detecting cosmic ray events at ultrahigh energies with the Telescope Array enables us to study this fundamental parameter that we are otherwise unable to access with particle accelerators. The data used in this report are the hybrid events observed by the Middle Drum fluorescence detector together with the surface array detector collected over five years. The value of the σp−airinel is found to be equal to 567.0±70.5[Stat]−25+29[Sys] mb. The total proton-proton cross section is subsequently inferred from Glauber formalism and the Block, Halzen and Stanev QCD inspired fit and is found to be equal to 170−44+48[Stat]−17+19[Sys] mb.

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Region-based interactive ranking optimization for person re-identification 15

Region-based interactive ranking optimization for person re-...

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15th Pacific-Rim Conference on Multimedia, PCM 2014

作者： Wang, Zheng Hu, Ruimin Liang, Chao Leng, Qingming Sun, Kaimin National Engineering Research Center for Multimedia Software School of Computer Wuhan University Wuhan China Research Institute of Wuhan University in Shenzhen China School of Information Science and Technology Jiujiang University Jiujiang China State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing Wuhan University Wuhan China

ISBN: (纸本)9783319131672

Person re-identification, aiming to identify images of the same person from various cameras configured in difference places, has attracted plenty of attention in the multimedia community. Previous work mainly focuses on feature presentation and distance measure, and achieves promising results on some standard databases. However, the performance is still not good enough due to appearance changes caused by variations in illuminations, poses, viewpoints and occlusion. This paper addresses the problem through result re-ranking by introducing user feedback. In particular, considering the peculiarity of scarce positive and global similar negative samples in the person re-identification problem, we propose a region-based interactive ranking optimization method, to improve the original query result by labeling locally similar and dissimilar image regions. Experiments conducted on two standard data sets have validated the effectiveness of the proposed method with an average improvement of 10-30% over original basic method. It is proved that the ranking optimization algorithm is both an effective and efficient method to improve the original person re-identification result. © Springer International Publishing Switzerland 2014.

关键词： Human computer interaction

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Centrality dependence of the nuclear modification factor of charged pions, kaons, and protons in Pb-Pb collisions at sNN=2.76 TeV

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Physical Review C 2016年第3期93卷 034913-034913页

作者： J. Adam D. Adamová M. M. Aggarwal G. Aglieri Rinella M. Agnello N. Agrawal Z. Ahammed S. U. Ahn I. Aimo S. Aiola M. Ajaz A. Akindinov S. N. Alam D. Aleksandrov B. Alessandro D. Alexandre R. Alfaro Molina A. Alici A. Alkin J. R. M. Almaraz J. Alme T. Alt S. Altinpinar I. Altsybeev C. Alves Garcia Prado C. Andrei A. Andronic V. Anguelov J. Anielski T. Antičić F. Antinori P. Antonioli L. Aphecetche H. Appelshäuser S. Arcelli N. Armesto R. Arnaldi I. C. Arsene M. Arslandok B. Audurier A. Augustinus R. Averbeck M. D. Azmi M. Bach A. Badalà Y. W. Baek S. Bagnasco R. Bailhache R. Bala A. Baldisseri F. Baltasar Dos Santos Pedrosa R. C. Baral A. M. Barbano R. Barbera F. Barile G. G. Barnaföldi L. S. Barnby V. Barret P. Bartalini K. Barth J. Bartke E. Bartsch M. Basile N. Bastid S. Basu B. Bathen G. Batigne A. Batista Camejo B. Batyunya P. C. Batzing I. G. Bearden H. Beck C. Bedda N. K. Behera I. Belikov F. Bellini H. Bello Martinez R. Bellwied R. Belmont E. Belmont-Moreno V. Belyaev G. Bencedi S. Beole I. Berceanu A. Bercuci Y. Berdnikov D. Berenyi R. A. Bertens D. Berzano L. Betev A. Bhasin I. R. Bhat A. K. Bhati B. Bhattacharjee J. Bhom L. Bianchi N. Bianchi C. Bianchin J. Bielčík J. Bielčíková A. Bilandzic R. Biswas S. Biswas S. Bjelogrlic J. T. Blair F. Blanco D. Blau C. Blume F. Bock A. Bogdanov H. Bøggild L. Boldizsár M. Bombara J. Book H. Borel A. Borissov M. Borri F. Bossú E. Botta S. Böttger P. Braun-Munzinger M. Bregant T. Breitner T. A. Broker T. A. Browning M. Broz E. J. Brucken E. Bruna G. E. Bruno D. Budnikov H. Buesching S. Bufalino P. Buncic O. Busch Z. Buthelezi J. B. Butt J. T. Buxton D. Caffarri X. Cai H. Caines L. Calero Diaz A. Caliva E. Calvo Villar P. Camerini F. Carena W. Carena F. Carnesecchi J. Castillo Castellanos A. J. Castro E. A. R. Casula C. Cavicchioli C. Ceballos Sanchez J. Cepila P. Cerello J. Cerkala B. Chang S. Chapeland M. Chartier J. L. Charvet S. Chattopadhyay V. Chelnokov M. Cherney C. Cheshkov B. Cheynis V. Chibante Barroso D. D. Chinellato P. Chochula K. Choi M. Chojnacki S. Choud Faculty of Nuclear Sciences and Physical Engineering Czech Technical University in Prague Prague Czech Republic Nuclear Physics Institute Academy of Sciences of the Czech Republic Řež u Prahy Czech Republic Physics Department Panjab University Chandigarh India European Organization for Nuclear Research (CERN) Geneva Switzerland Sezione INFN Turin Italy Indian Institute of Technology Bombay (IIT) Mumbai India Variable Energy Cyclotron Centre Kolkata India Korea Institute of Science and Technology Information Daejeon South Korea Politecnico di Torino Turin Italy Yale University New Haven Connecticut USA COMSATS Institute of Information Technology (CIIT) Islamabad Pakistan Institute for Theoretical and Experimental Physics Moscow Russia Russian Research Centre Kurchatov Institute Moscow Russia School of Physics and Astronomy University of Birmingham Birmingham United Kingdom Instituto de Física Universidad Nacional Autónoma de México Mexico City Mexico Sezione INFN Bologna Italy Centro Fermi - Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi” Rome Italy Bogolyubov Institute for Theoretical Physics Kiev Ukraine Universidad Autónoma de Sinaloa Culiacán Mexico Faculty of Engineering Bergen University College Bergen Norway Frankfurt Institute for Advanced Studies Johann Wolfgang Goethe-Universität Frankfurt Frankfurt Germany Department of Physics and Technology University of Bergen Bergen Norway V. Fock Institute for Physics St. Petersburg State University St. Petersburg Russia Universidade de São Paulo (USP) São Paulo Brazil National Institute for Physics and Nuclear Engineering Bucharest Romania Research Division and ExtreMe Matter Institute EMMI GSI Helmholtzzentrum für Schwerionenforschung Darmstadt Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany Institut für Kernphysik Westfälische Wilhelms-Universität Münster Münster Germany Rudjer Bošković Institute Zagreb Croatia Sezione INFN Padova

Transverse momentum (pT) spectra of pions, kaons, and protons up to pT=20GeV/c have been measured in Pb-Pb collisions at sNN=2.76TeV using the ALICE detector for six different centrality classes covering 0%–80%. The proton-to-pion and the kaon-to-pion ratios both show a distinct peak at pT≈3GeV/c in central Pb-Pb collisions that decreases for more peripheral collisions. For pT>10GeV/c, the nuclear modification factor is found to be the same for all three particle species in each centrality interval within systematic uncertainties of 10%–20%. This suggests there is no direct interplay between the energy loss in the medium and the particle species composition in the hard core of the quenched jet. For pT<10GeV/c, the data provide important constraints for models aimed at describing the transition from soft to hard physics.

关键词： Hard scattering Particle & resonance production Relativistic heavy-ion collisions

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Search for Structure in the Bs0π± Invariant Mass Spectrum

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Physical Review Letters 2016年第15期117卷 152003-152003页

作者： R. Aaij B. Adeva M. Adinolfi Z. Ajaltouni S. Akar J. Albrecht F. Alessio M. Alexander S. Ali G. Alkhazov P. Alvarez Cartelle A. A. Alves, Jr S. Amato S. Amerio Y. Amhis L. An L. Anderlini G. Andreassi M. Andreotti J. E. Andrews R. B. Appleby F. Archilli P. d’Argent J. Arnau Romeu A. Artamonov M. Artuso E. Aslanides G. Auriemma M. Baalouch I. Babuschkin S. Bachmann J. J. Back A. Badalov C. Baesso S. Baker W. Baldini R. J. Barlow C. Barschel S. Barsuk W. Barter M. Baszczyk V. Batozskaya B. Batsukh V. Battista A. Bay L. Beaucourt J. Beddow F. Bedeschi I. Bediaga L. J. Bel V. Bellee N. Belloli K. Belous I. Belyaev E. Ben-Haim G. Bencivenni S. Benson J. Benton A. Berezhnoy R. Bernet A. Bertolin F. Betti M.-O. Bettler M. van Beuzekom Ia. Bezshyiko S. Bifani P. Billoir T. Bird A. Birnkraut A. Bitadze A. Bizzeti T. Blake F. Blanc J. Blouw S. Blusk V. Bocci T. Boettcher A. Bondar N. Bondar W. Bonivento A. Borgheresi S. Borghi M. Borisyak M. Borsato F. Bossu M. Boubdir T. J. V. Bowcock E. Bowen C. Bozzi S. Braun M. Britsch T. Britton J. Brodzicka E. Buchanan C. Burr A. Bursche J. Buytaert S. Cadeddu R. Calabrese M. Calvi M. Calvo Gomez A. Camboni P. Campana D. Campora Perez D. H. Campora Perez L. Capriotti A. Carbone G. Carboni R. Cardinale A. Cardini P. Carniti L. Carson K. Carvalho Akiba G. Casse L. Cassina L. Castillo Garcia M. Cattaneo Ch. Cauet G. Cavallero R. Cenci M. Charles Ph. Charpentier G. Chatzikonstantinidis M. Chefdeville S. Chen S.-F. Cheung V. Chobanova M. Chrzaszcz X. Cid Vidal G. Ciezarek P. E. L. Clarke M. Clemencic H. V. Cliff J. Closier V. Coco J. Cogan E. Cogneras V. Cogoni L. Cojocariu P. Collins A. Comerma-Montells A. Contu A. Cook S. Coquereau G. Corti M. Corvo C. M. Costa Sobral B. Couturier G. A. Cowan D. C. Craik A. Crocombe M. Cruz Torres S. Cunliffe R. Currie C. D’Ambrosio F. Da Cunha Marinho E. Dall’Occo J. Dalseno P. N. Y. David A. Davis O. De Aguiar Francisco K. De Bruyn S. De Capua M. De Cian J. M. De Miranda L. De Paula M. De Serio P. De Simone C. T. Dean D. Decamp M. Deckenhoff L. Del Bu European Organization for Nuclear Research (CERN) Geneva Switzerland Universidad de Santiago de Compostela Santiago de Compostela Spain H.H. Wills Physics Laboratory University of Bristol Bristol United Kingdom Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Fakultät Physik Technische Universität Dortmund Dortmund Germany School of Physics and Astronomy University of Glasgow Glasgow United Kingdom Nikhef National Institute for Subatomic Physics Amsterdam Netherlands Petersburg Nuclear Physics Institute (PNPI) Gatchina Russia Imperial College London London United Kingdom University of Cincinnati Cincinnati Ohio USA Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil Sezione INFN di Padova Padova Italy LAL Université Paris-Sud CNRS/IN2P3 Orsay France Institute of Physics Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne Switzerland Sezione INFN di Firenze Firenze Italy Sezione INFN di Ferrara Ferrara Italy University of Maryland College Park Maryland USA School of Physics and Astronomy University of Manchester Manchester United Kingdom Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany Institute for High Energy Physics (IHEP) Protvino Russia Syracuse University Syracuse New York USA Sezione INFN di Roma La Sapienza Roma Italy Department of Physics University of Warwick Coventry United Kingdom ICCUB Universitat de Barcelona Barcelona Spain Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio) Rio de Janeiro Brazil (associated with Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil) Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences Kraków Poland National Center for Nuclear Research (NCBJ) Warsaw Poland LAPP Université Savoie Mont-Blanc CNRS/IN2P3 Annecy-Le-Vieux France Sezione INFN di Pisa Pisa Italy Centro Brasileiro de Pesquisas Físicas (

The Bs0π± invariant mass distribution is investigated in order to search for possible exotic meson states. The analysis is based on a data sample recorded with the LHCb detector corresponding to 3 fb−1 of pp collision data at s=7 and 8 TeV. No significant excess is found, and upper limits are set on the production rate of the claimed X(5568) state within the LHCb acceptance. Upper limits are also set as a function of the mass and width of a possible exotic meson decaying to the Bs0π± final state. The same limits also apply to a possible exotic meson decaying through the chain Bs*0π±, Bs*0→Bs0γ where the photon is excluded from the reconstructed decays.

关键词： Branching fraction Hadronic decays Quantum chromodynamics Bottom mesons Exotic mesons

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Measurement of the CP Asymmetry in Bs0−B¯s0 Mixing

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Physical Review Letters 2016年第6期117卷 061803-061803页

作者： R. Aaij B. Adeva M. Adinolfi Z. Ajaltouni S. Akar J. Albrecht F. Alessio M. Alexander S. Ali G. Alkhazov P. Alvarez Cartelle A. A. Alves, Jr. S. Amato S. Amerio Y. Amhis L. An L. Anderlini G. Andreassi M. Andreotti J. E. Andrews R. B. Appleby F. Archilli P. d’Argent J. Arnau Romeu A. Artamonov M. Artuso E. Aslanides G. Auriemma M. Baalouch S. Bachmann J. J. Back A. Badalov C. Baesso W. Baldini R. J. Barlow C. Barschel S. Barsuk W. Barter M. Baszczyk V. Batozskaya V. Battista A. Bay L. Beaucourt J. Beddow F. Bedeschi I. Bediaga L. J. Bel V. Bellee N. Belloli K. Belous I. Belyaev E. Ben-Haim G. Bencivenni S. Benson J. Benton A. Berezhnoy R. Bernet A. Bertolin M.-O. Bettler M. van Beuzekom S. Bifani P. Billoir T. Bird A. Birnkraut A. Bitadze A. Bizzeti T. Blake F. Blanc J. Blouw S. Blusk V. Bocci T. Boettcher A. Bondar N. Bondar W. Bonivento S. Borghi M. Borisyak M. Borsato F. Bossu M. Boubdir T. J. V. Bowcock E. Bowen C. Bozzi S. Braun M. Britsch T. Britton J. Brodzicka E. Buchanan C. Burr A. Bursche J. Buytaert S. Cadeddu R. Calabrese M. Calvi M. Calvo Gomez P. Campana D. Campora Perez L. Capriotti A. Carbone G. Carboni R. Cardinale A. Cardini P. Carniti L. Carson K. Carvalho Akiba G. Casse L. Cassina L. Castillo Garcia M. Cattaneo Ch. Cauet G. Cavallero R. Cenci M. Charles Ph. Charpentier G. Chatzikonstantinidis M. Chefdeville S. Chen S.-F. Cheung V. Chobanova M. Chrzaszcz X. Cid Vidal G. Ciezarek P. E. L. Clarke M. Clemencic H. V. Cliff J. Closier V. Coco J. Cogan E. Cogneras V. Cogoni L. Cojocariu P. Collins A. Comerma-Montells A. Contu A. Cook S. Coquereau G. Corti M. Corvo C. M. Costa Sobral B. Couturier G. A. Cowan D. C. Craik A. Crocombe M. Cruz Torres S. Cunliffe R. Currie C. D’Ambrosio E. Dall’Occo J. Dalseno P. N. Y. David A. Davis O. De Aguiar Francisco K. De Bruyn S. De Capua M. De Cian J. M. De Miranda L. De Paula P. De Simone C. T. Dean D. Decamp M. Deckenhoff L. Del Buono M. Demmer D. Derkach O. Deschamps F. Dettori B. Dey A. Di Canto H. Dijkstra F. Dordei M. Dorigo A. Dosil Suárez A. Dovbnya K. Dre European Organization for Nuclear Research (CERN) Geneva Switzerland Universidad de Santiago de Compostela Santiago de Compostela Spain H.H. Wills Physics Laboratory University of Bristol Bristol United Kingdom Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Fakultät Physik Technische Universität Dortmund Dortmund Germany School of Physics and Astronomy University of Glasgow Glasgow United Kingdom Nikhef National Institute for Subatomic Physics Amsterdam Netherlands Petersburg Nuclear Physics Institute (PNPI) Gatchina Russia Imperial College London London United Kingdom University of Cincinnati Cincinnati Ohio USA Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil Sezione INFN di Padova Padova Italy LAL Université Paris-Sud CNRS/IN2P3 Orsay France Institute of Physics Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne Switzerland Sezione INFN di Firenze Firenze Italy Sezione INFN di Ferrara Ferrara Italy University of Maryland College Park Maryland USA School of Physics and Astronomy University of Manchester Manchester United Kingdom Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany Institute for High Energy Physics (IHEP) Protvino Russia Syracuse University Syracuse New York USA Sezione INFN di Roma La Sapienza Roma Italy Department of Physics University of Warwick Coventry United Kingdom ICCUB Universitat de Barcelona Barcelona Spain Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio) Rio de Janeiro Brazil (associated with Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil) Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences Kraków Poland National Center for Nuclear Research (NCBJ) Warsaw Poland LAPP Université Savoie Mont-Blanc CNRS/IN2P3 Annecy-Le-Vieux France Sezione INFN di Pisa Pisa Italy Centro Brasileiro de Pesquisas Físicas (

The CP asymmetry in the mixing of Bs0 and B¯s0 mesons is measured in proton-proton collision data corresponding to an integrated luminosity of 3.0 fb−1, recorded by the LHCb experiment at center-of-mass energies of 7 and 8 TeV. Semileptonic Bs0 and B¯s0 decays are studied in the inclusive mode Ds∓μ±ν(−)μX with the Ds∓ mesons reconstructed in the K+K−π∓ final state. Correcting the observed charge asymmetry for detection and background effects, the CP asymmetry is found to be asls=(0.39±0.26±0.20)%, where the first uncertainty is statistical and the second systematic. This is the most precise measurement of asls to date. It is consistent with the prediction from the standard model and will constrain new models of particle physics.

关键词： Hadron mixing Bottom mesons CP violation

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Centrality dependence of pion freeze-out radii in Pb-Pb collisions at sNN=2.76 TeV

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Physical Review C 2016年第2期93卷 024905-024905页

作者： J. Adam D. Adamová M. M. Aggarwal G. Aglieri Rinella M. Agnello N. Agrawal Z. Ahammed S. U. Ahn I. Aimo S. Aiola M. Ajaz A. Akindinov S. N. Alam D. Aleksandrov B. Alessandro D. Alexandre R. Alfaro Molina A. Alici A. Alkin J. R. M. Almaraz J. Alme T. Alt S. Altinpinar I. Altsybeev C. Alves Garcia Prado C. Andrei A. Andronic V. Anguelov J. Anielski T. Antičić F. Antinori P. Antonioli L. Aphecetche H. Appelshäuser S. Arcelli N. Armesto R. Arnaldi I. C. Arsene M. Arslandok B. Audurier A. Augustinus R. Averbeck M. D. Azmi M. Bach A. Badalà Y. W. Baek S. Bagnasco R. Bailhache R. Bala A. Baldisseri F. Baltasar Dos Santos Pedrosa R. C. Baral A. M. Barbano R. Barbera F. Barile G. G. Barnaföldi L. S. Barnby V. Barret P. Bartalini K. Barth J. Bartke E. Bartsch M. Basile N. Bastid S. Basu B. Bathen G. Batigne A. Batista Camejo B. Batyunya P. C. Batzing I. G. Bearden H. Beck C. Bedda N. K. Behera I. Belikov F. Bellini H. Bello Martinez R. Bellwied R. Belmont E. Belmont-Moreno V. Belyaev G. Bencedi S. Beole I. Berceanu A. Bercuci Y. Berdnikov D. Berenyi R. A. Bertens D. Berzano L. Betev A. Bhasin I. R. Bhat A. K. Bhati B. Bhattacharjee J. Bhom L. Bianchi N. Bianchi C. Bianchin J. Bielčík J. Bielčíková A. Bilandzic R. Biswas S. Biswas S. Bjelogrlic J. T. Blair F. Blanco D. Blau C. Blume F. Bock A. Bogdanov H. Bøggild L. Boldizsár M. Bombara J. Book H. Borel A. Borissov M. Borri F. Bossú E. Botta S. Böttger P. Braun-Munzinger M. Bregant T. Breitner T. A. Broker T. A. Browning M. Broz E. J. Brucken E. Bruna G. E. Bruno D. Budnikov H. Buesching S. Bufalino P. Buncic O. Busch Z. Buthelezi J. B. Butt J. T. Buxton D. Caffarri X. Cai H. Caines L. Calero Diaz A. Caliva E. Calvo Villar P. Camerini F. Carena W. Carena F. Carnesecchi J. Castillo Castellanos A. J. Castro E. A. R. Casula C. Cavicchioli C. Ceballos Sanchez J. Cepila P. Cerello J. Cerkala B. Chang S. Chapeland M. Chartier J. L. Charvet S. Chattopadhyay V. Chelnokov M. Cherney C. Cheshkov B. Cheynis V. Chibante Barroso D. D. Chinellato P. Chochula K. Choi M. Chojnacki S. Choud Faculty of Nuclear Sciences and Physical Engineering Czech Technical University in Prague Prague Czech Republic Nuclear Physics Institute Academy of Sciences of the Czech Republic Řež u Prahy Czech Republic Physics Department Panjab University Chandigarh India European Organization for Nuclear Research (CERN) Geneva Switzerland Sezione INFN Turin Italy Indian Institute of Technology Bombay (IIT) Mumbai India Variable Energy Cyclotron Centre Kolkata India Korea Institute of Science and Technology Information Daejeon South Korea Politecnico di Torino Turin Italy Yale University New Haven Connecticut United States COMSATS Institute of Information Technology (CIIT) Islamabad Pakistan Institute for Theoretical and Experimental Physics Moscow Russia Russian Research Centre Kurchatov Institute Moscow Russia School of Physics and Astronomy University of Birmingham Birmingham United Kingdom Instituto de Física Universidad Nacional Autónoma de México Mexico City Mexico Sezione INFN Bologna Italy Centro Fermi–Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi ” Rome Italy Bogolyubov Institute for Theoretical Physics Kiev Ukraine Universidad Autónoma de Sinaloa Culiacán Mexico Faculty of Engineering Bergen University College Bergen Norway Frankfurt Institute for Advanced Studies Johann Wolfgang Goethe-Universität Frankfurt Frankfurt Germany Department of Physics and Technology University of Bergen Bergen Norway V. Fock Institute for Physics St. Petersburg State University St. Petersburg Russia Universidade de São Paulo (USP) São Paulo Brazil National Institute for Physics and Nuclear Engineering Bucharest Romania Research Division and ExtreMe Matter Institute EMMI GSI Helmholtzzentrum für Schwerionenforschung Darmstadt Germany Physikalisches Institut Ruprecht–Karls-Universität Heidelberg Heidelberg Germany Institut für Kernphysik Westfälische Wilhelms-Universität Münster Münster Germany Rudjer Bošković Institute Zagreb Croatia Sezione INFN

We report on the measurement of freeze-out radii for pairs of identical-charge pions measured in Pb-Pb collisions at sNN=2.76 TeV as a function of collision centrality and the average transverse momentum of the pair kT. Three-dimensional sizes of the system (femtoscopic radii), as well as direction-averaged one-dimensional radii are extracted. The radii decrease with kT, following a power-law behavior. This is qualitatively consistent with expectations from a collectively expanding system, produced in hydrodynamic calculations. The radii also scale linearly with 〈dNch/dη〉1/3. This behavior is compared to world data on femtoscopic radii in heavy-ion collisions. While the dependence is qualitatively similar to results at smaller sNN, a decrease in the ratio Rout/Rside is seen, which is in qualitative agreement with a specific prediction from hydrodynamic models: a change from inside-out to outside-in freeze-out configuration. The results provide further evidence for the production of a collective, strongly coupled system in heavy-ion collisions at the CERN Large Hadron Collider.

关键词： Hydrodynamic models Particle correlations & fluctuations Relativistic heavy-ion collisions

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