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Multipion Bose-Einstein correlations in pp,p-Pb, and Pb-Pb collisions at energies available at the CERN Large Hadron Collider

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Physical Review C 2016年第5期93卷 054908-054908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. 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 P. Benacek 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 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 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 P. Christakoglou C. H. Christe 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 USA Institute for Theoretical and Experimental Physics Moscow Russia National Research Center 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 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 Rudjer Bošković Institute Zagreb Croatia Sezione INFN Padova Italy SUBATECH Ecole des Mines de Nantes Université de Nantes CNRS-IN2P3 Nantes France Institut für Kernphysik Johann Wolf

Three- and four-pion Bose-Einstein correlations are presented in pp,p-Pb, and Pb-Pb collisions at the LHC. We compare our measured four-pion correlations to the expectation derived from two- and three-pion measurements. Such a comparison provides a method to search for coherent pion emission. We also present mixed-charge correlations in order to demonstrate the effectiveness of several analysis procedures such as Coulomb corrections. Same-charge four-pion correlations in pp and p-Pb appear consistent with the expectations from three-pion measurements. However, the presence of non-negligible background correlations in both systems prevent a conclusive statement. In Pb-Pb collisions, we observe a significant suppression of three- and four-pion Bose-Einstein correlations compared to expectations from two-pion measurements. There appears to be no centrality dependence of the suppression within the 0%–50% centrality interval. The origin of the suppression is not clear. However, by postulating either coherent pion emission or large multibody Coulomb effects, the suppression may be explained.

关键词： Nucleon-nucleon interactions Particle correlations & fluctuations Relativistic heavy-ion collisions

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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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Charge-dependent flow and the search for the chiral magnetic wave in Pb-Pb collisions at sNN=2.76 TeV

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Physical Review C 2016年第4期93卷 044903-044903页

作者： J. Adam D. Adamová M. M. Aggarwal G. Aglieri Rinella M. Agnello N. Agrawal Z. Ahammed S. U. Ahn S. Aiola 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 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 P. Benacek 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 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 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 P. Christakoglou C. H. Chri 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 Yale University New Haven Connecticut USA Institute for Theoretical and Experimental Physics Moscow Russia 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 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 Italy SUBATECH Ecole des Mines de Nantes Université de Nantes CNRS-IN2P3 Nantes France Institut für K

We report on measurements of a charge-dependent flow using a novel three-particle correlator with ALICE in Pb-Pb collisions at the CERN Large Hadron Collider (LHC), and discuss the implications for observation of local parity violation and the chiral magnetic wave (CMW) in heavy-ion collisions. Charge-dependent flow is reported for different collision centralities as a function of the event charge asymmetry. While our results are in qualitative agreement with expectations based on the CMW, the nonzero signal observed in higher harmonics correlations indicates a possible significant background contribution. We also present results on a differential correlator, where the flow of positive and negative charges is reported as a function of the mean charge of the particles and their pseudorapidity separation. We argue that this differential correlator is better suited to distinguish the differences in positive and negative charges expected due to the CMW and the background effects, such as local charge conservation coupled with strong radial and anisotropic flow.

关键词： Collective flow Particle correlations & fluctuations Relativistic heavy-ion collisions

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A preliminary experimental design study on the friction coefficient of an ordered pebble bed core of the TMSR-SF1 reactor

A preliminary experimental design study on the friction coef...

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International Congress on Advances in nuclear Power Plants, ICAPP 2014

作者： Qu, Shixiang He, Zhaozhong Chen, Kun Liu, Xiaojing TMSR Centre Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China School of Nuclear Science and Engineering Shanghai Jiaotong University Shanghai 200240 China

ISBN: (纸本)9781632668264

An experiment is designed for studying flow resistance of the TMSR-SF1 reactor core. The experimental section is a cylinder that contains pebbles arranged in the same manner as the real reactor core. Because of the technical and financial challenges in using the FLiBe salt as the experimental fluid, water is used in the flow resistance experiment. A fluid-to-fluid scaling analysis method is introduced in designing the experimental program and applying the results obtained from the water experiment to the FLiBe system. The volumetric flow rate in the water experiment is up to 12.3 m3/h. From the results of the experiment, we may obtain the correlations between the friction coefficient of the experimental section and the Reynolds number. We also explore errors of the planned experiment and provide corresponding methods possible to reduce the errors.

关键词： Friction

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Solitons in optical metamaterials with trial solution approach and Bäcklund transform of Riccati equation

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Journal of Computational and Theoretical Nanoscience 2015年第12期12卷 5940-5948页

作者： Arnous, A.H. Mirzazadeh, Mohammad Moshokoa, Seithuti Medhekar, Sarang Zhou, Qin Mahmood, M.F. Biswas, Anjan Belic, Milivoj Department of Engineering Mathematics and Physics Higher Institute of Engineering El Shorouk Egypt Department of Engineering Sciences University of Guilan Rudsar-Vajargah44891-63157 Iran Department of Mathematics and Statistics Tshwane University of Technology Pretoria0008 South Africa Centre for Applied Physics Central University of Jharkhand Brambe Ranchi835205 India School of Electronics and Information Engineering Wuhan Donghu University Wuhan430212 China Department of Mathematics Howard University WashingtonDC20059 United States Department of Mathematical Sciences Delaware State University DoverDE19901-2277 United States Department of Mathematics Faculty of Science King Abdulaziz University Jeddah21589 Saudi Arabia Science Program Texas A and M University at Qatar P.O. Box 23874 Doha Qatar

This paper obtains soliton solutions in optical metamaterials. There are a couple of integration techniques that are applied to the nonlinear Schrödinger's equation, with full nonlinearity, that serves as the governing model. These are trial solution approach and application of Bäcklund transform to Riccati equation. There are four types of nonlinear media that are studied in this paper. They are Kerr law that is also referred to as cubic law, power law, parabolic law occasionally referred to as cubic-quintic law and finally dual-power law nonlinearity. Bright, dark and singular soliton solutions are obtained in optical metamaterials with the aid of the two algorithms. As a byproduct of these two approaches, singular periodic solutions and plane wave solutions are also listed although these are not utilized in optical metamaterials. There are several constraint conditions that naturally fall out from the solution structure. These conditions guarantee the existence of these variety of solutions. Copyright © 2015 American Scientific Publishers All rights reserved.

关键词： Solitons

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The research progress of some key problems about the protection of industrial electron irradiation accelerator 18

The research progress of some key problems about the protect...

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18th Topical Meeting of the Radiation Protection and Shielding Division of ANS, RPSD 2014

作者： Lei, Jieying Chen, Zhi Yu, Guobing Yan, Mingyang Duan, Zongjin Li, Yuxiong Xu, X. George School of Nuclear Science and Technology University of Science and Technology of China Hefei China Program of Nuclear Engineering and Engineering Physics Rensselaer Polytechnic Institute TroyNY United States Radiation Environment Supervision Station of Anhui Province Hefei Huangshan road 443 Shushan-District Hefei China

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Evidence of sub-surface energy storage in comet 67P from the outburst of 2016 July 3

arXiv

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arXiv 2017年

作者： Agarwal, J. della Corte, V. Feldman, P.D. Geiger, B. Merouane, S. Bertini, I. Bodewits, D. Fornasier, S. Grün, E. Hasselmann, P. Hilchenbach, M. Höfner, S. Ivanovski, S. Kolokolova, L. Pajola, M. Rotundi, A. Sierks, H. Steffl, A.J. Thomas, N. A’Hearn, M.F. Barbieri, C. Barucci, M.A. Bertaux, J.-L. Boudreault, S. Cremonese, G. da Deppo, V. Davidsson, B. Debei, S. de Cecco, M. Deller, J.F. Feaga, L.M. Fischer, H. Fulle, M. Gicquel, A. Groussin, O. Güttler, C. Gutiérrez, P.J. Hofmann, M. Hornung, K. Hviid, S.F. Ip, W.-H. Jorda, L. Keller, H.U. Kissel, J. Knollenberg, J. Koch, A. Koschny, D. Kramm, J.-R. Kührt, E. Küppers, M. Lamy, P.L. Langevin, Y. Lara, L.M. Lazzarin, M. Lin, Z.-Y. Lopez Moreno, J.J. Lowry, S.C. Marzari, F. Mottola, S. Naletto, G. Oklay, N. Parker, J.Wm. Rodrigo, R. Rynö, J. Shi, X. Stenzel, O. Tubiana, C. Vincent, J.-B. Weaver, H.A. Zaprudin, B. Max Planck Institute for Solar System Research Justus-von-Liebig-Weg 3 Göttingen37077 Germany Dipartimento di Scienze e Tecnologie Università degli Studi di Napoli "Parthenope" CDN IC4 Naples80143 Italy Institute for Space Astrophysics and Planetology Via Fosso del Cavaliere 100 RomaI-00133 Italy Johns Hopkins University Department of Physics and Astronomy 3400 N. Charles Street BaltimoreMD21218 United States European Space Astronomy Centre Camino bajo del Castillo s/n Villanueva de la Cañada28692 Spain University of Padova Via Venezia 15 Padova35131 Italy Department for Astronomy University of Maryland College ParkMD20742-2421 United States LESIA Observatoire de Paris PSL Research University CNRS Univ. Paris Diderot Sorbonne Paris Cité UPMC Univ. Paris 06 Sorbonne Universités 5 Place J. Janssen Meudon Pricipal Cedex92195 France Max Planck Institute for Nuclear Physics Saupfercheckweg 1 Heidelberg69117 Germany Laboratory for Atmospheric and Space Physics University of Colorado 1234 Innovation Dr BoulderCO80303 United States NASA Ames Research Center Moffett FieldCA94035 United States Southwest Research Institute Department of Space Studies BoulderCO United States Physikalisches Institut University of Bern Sidlerstrasse 5 BernCH-3012 Switzerland Department of Physics and Astronomy "G. Galilei" University of Padova Vic. Osservatorio 3 Padova35122 Italy LATMOS CNRS/UVSQ/IPSL 11 Boulevard d’Alembert Guyancourt78280 France INAF Osservatorio Astronomico di Padova Vicolo dell’Osservatorio 5 Padova35122 Italy CNR-IFN UOS Padova LUXOR Via Trasea 7 Padova35131 Italy Jet Propulsion Laboratory M/S 183-401 4800 Oak Grove Drive PasadenaCA91109 United States Department of Industrial Engineering University of Padova Via Venezia 1 Padova35131 Italy INAF - Osservatorio Astronomico di Trieste via Tiepolo 11 Trieste34143 Italy UMR 7326 Marseille13388 France Instituto de Astrofisica de Andalucia-CSIC Glorieta de la Astronomia

On 3 July 2016, several instruments on board ESA’s Rosetta spacecraft detected signs of an outburst event on comet 67P, at a heliocentric distance of 3.32 AU from the sun, outbound from perihelion. We here report on the inferred properties of the ejected dust and the surface change at the site of the outburst. The activity coincided with the local sunrise and continued over a time interval of 14 – 68 minutes. It left a 10m-sized icy patch on the surface. The ejected material comprised refractory grains of several hundred microns in size, and sub-micron-sized water ice grains. The high dust mass production rate is incompatible with the free sublimation of crystalline water ice under solar illumination as the only acceleration process. Additional energy stored near the surface must have increased the gas density. We suggest a pressurized sub-surface gas reservoir, or the crystallization of amorphous water ice as possible causes. Copyright © 2017, The Authors. All rights reserved.

关键词： Comets

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Centrality-Dependent Modification of Jet-Production Rates in Deuteron-Gold Collisions at sNN=200 GeV

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Physical Review Letters 2016年第12期116卷 122301-122301页

作者： A. Adare C. Aidala N. N. Ajitanand Y. Akiba H. Al-Bataineh J. Alexander M. Alfred A. Angerami K. Aoki N. Apadula Y. Aramaki H. Asano E. T. Atomssa R. Averbeck T. C. Awes B. Azmoun V. Babintsev M. Bai G. Baksay L. Baksay N. S. Bandara B. Bannier K. N. Barish B. Bassalleck A. T. Basye S. Bathe V. Baublis C. Baumann A. Bazilevsky M. Beaumier S. Beckman S. Belikov R. Belmont R. Bennett A. Berdnikov Y. Berdnikov J. H. Bhom D. S. Blau J. S. Bok K. Boyle M. L. Brooks J. Bryslawskyj H. Buesching V. Bumazhnov G. Bunce S. Butsyk S. Campbell A. Caringi C.-H. Chen C. Y. Chi M. Chiu I. J. Choi J. B. Choi R. K. Choudhury P. Christiansen T. Chujo P. Chung O. Chvala V. Cianciolo Z. Citron B. A. Cole Z. Conesa del Valle M. Connors M. Csanád T. Csörgő T. Dahms S. Dairaku I. Danchev T. W. Danley K. Das A. Datta M. S. Daugherity G. David M. K. Dayananda K. DeBlasio K. Dehmelt A. Denisov A. Deshpande E. J. Desmond K. V. Dharmawardane O. Dietzsch A. Dion P. B. Diss J. H. Do M. Donadelli L. D’Orazio O. Drapier A. Drees K. A. Drees J. M. Durham A. Durum D. Dutta S. Edwards Y. V. Efremenko F. Ellinghaus T. Engelmore A. Enokizono H. En’yo S. Esumi B. Fadem N. Feege 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 C. Gal P. Gallus P. Garg I. Garishvili H. Ge F. Giordano A. Glenn H. Gong M. Gonin Y. Goto R. Granier de Cassagnac N. Grau S. V. Greene G. Grim M. Grosse Perdekamp T. Gunji H.-Å. Gustafsson T. Hachiya J. S. Haggerty K. I. Hahn H. Hamagaki J. Hamblen H. F. Hamilton R. Han S. Y. Han J. Hanks S. Hasegawa T. O. S. Haseler K. Hashimoto E. Haslum R. Hayano X. He M. Heffner T. K. Hemmick T. Hester J. C. Hill M. Hohlmann R. S. Hollis W. Holzmann K. Homma B. Hong T. Horaguchi D. Hornback T. Hoshino N. Hotvedt J. Huang S. Huang T. Ichihara R. Ichimiya Y. Ikeda K. Imai M. Inaba A. Iordanova D. Isenhower M. Ishihara M. Issah D. Ivanishchev Y. Iwanaga B. V. Jacak M. Jezghani J. Jia X. Jiang J. Jin B. M. Johnson T. Jones K. S. Joo D. Jouan D. S. Jumper University of Colorado Boulder Colorado 80309 USA Department of Physics University of Massachusetts Amherst Massachusetts 01003-9337 USA Department of Physics University of Michigan Ann Arbor Michigan 48109-1040 USA Chemistry Department Stony Brook University SUNY Stony Brook 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 Department of Physics and Astronomy Howard University Washington DC 20059 USA Columbia University New York New York 10027 and Nevis Laboratories Irvington New York 10533 USA KEK High Energy Accelerator Research Organization Tsukuba Ibaraki 305-0801 Japan Kyoto University Kyoto 606-8502 Japan Iowa State University Ames Iowa 50011 USA Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794-3800 USA Center for Nuclear Study Graduate School of Science University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 113-0033 Japan Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS-IN2P3 Route de Saclay F-91128 Palaiseau France 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 University of California-Riverside Riverside California 92521 USA University of New Mexico Albuquerque New Mexico 87131 USA Abilene Christian University Abilene Texas 79699 USA Baruch College City University of New York New York New York 10010 USA PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad region 188300 Russia Institut für Kernphysik University o

Jet production rates are measured in p+p and d+Au collisions at sNN=200 GeV recorded in 2008 with the PHENIX detector at the Relativistic Heavy Ion Collider. Jets are reconstructed using the R=0.3 anti-kt algorithm from energy deposits in the electromagnetic calorimeter and charged tracks in multiwire proportional chambers, and the jet transverse momentum (pT) spectra are corrected for the detector response. Spectra are reported for jets with 12nuclear-modification factor (RdAu) values for 0%–100% d+Au events are found to be consistent with unity, constraining the role of initial state effects on jet production. However, the centrality-selected RdAu values and central-to-peripheral ratios (RCP) show large, pT-dependent deviations from unity, challenging the conventional models that relate hard-process rates and soft-particle production in collisions involving nuclei.

关键词： Jets & heavy flavor physics Quark-gluon plasma Relativistic heavy-ion collisions

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Azimuthally anisotropic emission of low-momentum direct photons in Au + Au collisions at sNN=200 GeV

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Physical Review C 2016年第6期94卷 064901-064901页

作者： A. Adare S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba R. Akimoto H. Al-Bataineh J. Alexander M. Alfred H. Al-Ta'ani A. Angerami K. Aoki N. Apadula Y. Aramaki H. Asano E. C. Aschenauer E. T. Atomssa R. Averbeck T. C. Awes B. Azmoun V. Babintsev M. Bai G. Baksay L. Baksay N. S. Bandara B. Bannier K. N. Barish B. Bassalleck A. T. Basye S. Bathe V. Baublis C. Baumann S. Baumgart A. Bazilevsky M. Beaumier S. Beckman S. Belikov R. Belmont R. Bennett A. Berdnikov Y. Berdnikov A. A. Bickley D. S. Blau J. S. Bok K. Boyle M. L. Brooks J. Bryslawskyj H. Buesching V. Bumazhnov G. Bunce S. Butsyk C. M. Camacho S. Campbell P. Castera C.-H. Chen C. Y. Chi M. Chiu I. J. Choi J. B. Choi S. Choi R. K. Choudhury P. Christiansen T. Chujo P. Chung O. Chvala V. Cianciolo Z. Citron B. A. Cole M. Connors P. Constantin M. Csanád T. Csörgő T. Dahms S. Dairaku I. Danchev T. W. Danley K. Das A. Datta M. S. Daugherity G. David K. DeBlasio K. Dehmelt A. Denisov A. Deshpande E. J. Desmond K. V. Dharmawardane O. Dietzsch L. Ding A. Dion P. B. Diss J. H. Do M. Donadelli L. D'Orazio O. Drapier A. Drees K. A. Drees J. M. Durham A. Durum D. Dutta S. Edwards Y. V. Efremenko F. Ellinghaus T. Engelmore A. Enokizono H. En'yo S. Esumi K. O. Eyser B. Fadem N. Feege 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 K. Gainey C. Gal P. Gallus P. Garg A. Garishvili I. Garishvili H. Ge F. Giordano A. Glenn H. Gong X. Gong M. Gonin Y. Goto R. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp T. Gunji L. Guo H.-Å. Gustafsson T. Hachiya J. S. Haggerty K. I. Hahn H. Hamagaki J. Hamblen H. F. Hamilton R. Han S. Y. Han J. Hanks E. P. Hartouni S. Hasegawa T. O. S. Haseler K. Hashimoto E. Haslum R. Hayano X. He M. Heffner T. K. Hemmick T. Hester J. C. Hill M. Hohlmann R. S. Hollis W. Holzmann K. Homma B. Hong T. Horaguchi Y. Hori D. Hornback T. Hoshino N. Hotvedt J. Huang S. Huang T. Ichihara R. Ichimiya J. Ide H. Iinuma Y. Ikeda K. Imai J. Imrek M. Inaba A. Io University of Colorado Boulder Colorado 80309 USA Joint Institute for Nuclear Research 141980 Dubna Moscow Region Russia Los Alamos National Laboratory Los Alamos New Mexico 87545 USA Department of Physics University of Massachusetts Amherst Massachusetts 01003-9337 USA Department of Physics University of Michigan Ann Arbor Michigan 48109-1040 USA Chemistry Department Stony Brook University SUNY Stony Brook 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 Center for Nuclear Study Graduate School of Science University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 113-0033 Japan New Mexico State University Las Cruces New Mexico 88003 USA Department of Physics and Astronomy Howard University Washington D.C. 20059 USA Columbia University New York New York 10027 USA and Nevis Laboratories Irvington New York 10533 USA KEK High Energy Accelerator Research Organization Tsukuba Ibaraki 305-0801 Japan Kyoto University Kyoto 606-8502 Japan Iowa State University Ames Iowa 50011 USA Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794-3800 USA 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 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 University of California-Riverside Riverside California 92521 USA University of New Mexico Albuquerque New Mexico 87131 USA Abilene Christian University Abilene Texas 79699 USA Baruch College City University of New York New York

The PHENIX experiment at the BNL Relativistic Heavy Ion Collider has measured second- and third-order Fourier coefficients of the azimuthal distributions of direct photons emitted at midrapidity in Au+Au collisions at sNN=200 GeV for various collision centralities. Combining two different analysis techniques, results were obtained in the transverse momentum range of 0.4

关键词： Photon, lepton & quark production Relativistic heavy-ion collisions

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D-meson production in p-Pb collisions at sNN=5.02 TeV and in pp collisions at s=7 TeV

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Physical Review C 2016年第5期94卷 054908-054908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. 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 L. G. E. Beltran 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 M. Bonora 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. 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 Politecnico di Torino and Sezione INFN Turin Italy 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 Department of Physics and Technology University of Bergen Bergen Norway Faculty of Engineering Bergen University College 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

Background: In the context of the investigation of the quark gluon plasma produced in heavy-ion collisions, hadrons containing heavy (charm or beauty) quarks play a special role for the characterization of the hot and dense medium created in the interaction. The measurement of the production of charm and beauty hadrons in proton–proton collisions, besides providing the necessary reference for the studies in heavy-ion reactions, constitutes an important test of perturbative quantum chromodynamics (pQCD) calculations. Heavy-flavor production in proton–nucleus collisions is sensitive to the various effects related to the presence of nuclei in the colliding system, commonly denoted cold-nuclear-matter effects. Most of these effects are expected to modify open-charm production at low transverse momenta (pT) and, so far, no measurement of D-meson production down to zero transverse momentum was available at mid-rapidity at the energies attained at the CERN Large Hadron Collider (LHC).

关键词： Nucleon induced nuclear reactions Particle & resonance production Relativistic heavy-ion collisions

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