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One-dimensional charged kaon femtoscopy in p-Pb collisions at sNN = 5.02 TeV

physical Review C 2019年第2期100卷 024002-024002页

作者： S. Acharya D. Adamová S. P. Adhya A. Adler J. Adolfsson M. M. Aggarwal G. Aglieri Rinella M. Agnello N. Agrawal Z. Ahammed S. Ahmad S. U. Ahn S. Aiola A. Akindinov M. Al-Turany S. N. Alam D. S. D. Albuquerque D. Aleksandrov B. Alessandro H. M. Alfanda R. Alfaro Molina B. Ali Y. Ali A. Alici A. Alkin J. Alme T. Alt L. Altenkamper I. Altsybeev M. N. Anaam C. Andrei D. Andreou H. A. Andrews A. Andronic M. Angeletti V. Anguelov C. Anson T. Antičić F. Antinori P. Antonioli R. Anwar N. Apadula L. Aphecetche H. Appelshäuser S. Arcelli R. Arnaldi M. Arratia I. C. Arsene M. Arslandok A. Augustinus R. Averbeck S. Aziz M. D. Azmi A. Badalà Y. W. Baek S. Bagnasco R. Bailhache R. Bala A. Baldisseri M. Ball R. C. Baral R. Barbera L. Barioglio G. G. Barnaföldi L. S. Barnby V. Barret P. Bartalini K. Barth E. Bartsch N. Bastid S. Basu G. Batigne B. Batyunya P. C. Batzing D. Bauri J. L. Bazo Alba I. G. Bearden C. Bedda N. K. Behera I. Belikov F. Bellini R. Bellwied L. G. E. Beltran V. Belyaev G. Bencedi S. Beole A. Bercuci Y. Berdnikov D. Berenyi R. A. Bertens D. Berzano L. Betev A. Bhasin I. R. Bhat H. Bhatt B. Bhattacharjee A. Bianchi L. Bianchi N. Bianchi J. Bielčík J. Bielčíková A. Bilandzic G. Biro R. Biswas S. Biswas J. T. Blair D. Blau C. Blume G. Boca F. Bock A. Bogdanov L. Boldizsár A. Bolozdynya M. Bombara G. Bonomi M. Bonora H. Borel A. Borissov M. Borri H. Bossi E. Botta C. Bourjau L. Bratrud P. Braun-Munzinger M. Bregant T. A. Broker M. Broz E. J. Brucken E. Bruna G. E. Bruno M. D. Buckland D. Budnikov H. Buesching S. Bufalino O. Bugnon P. Buhler P. Buncic O. Busch Z. Buthelezi J. B. Butt J. T. Buxton D. Caffarri A. Caliva E. Calvo Villar R. S. Camacho P. Camerini A. A. Capon F. Carnesecchi J. Castillo Castellanos A. J. Castro E. A. R. Casula F. Catalano C. Ceballos Sanchez P. Chakraborty S. Chandra B. Chang W. Chang S. Chapeland M. Chartier S. Chattopadhyay A. Chauvin C. Cheshkov B. Cheynis V. Chibante Barroso D. D. Chinellato S. Cho P. Chochula T. Chowdhury P. Christakoglou C. H. Christensen P. Christiansen T. Chujo Variable Energy Cyclotron Centre Homi Bhabha National Institute Kolkata India Nuclear Physics Institute of the Czech Academy of Sciences Řež u Prahy Czech Republic Johann-Wolfgang-Goethe Universität Frankfurt Institut für Informatik Fachbereich Informatik und Mathematik Frankfurt Germany Lund University Department of Physics Division of Particle Physics Lund Sweden Physics Department Panjab University Chandigarh India European Organization for Nuclear Research (CERN) Geneva Switzerland Dipartimento DISAT del Politecnico and Sezione INFN Turin Italy Centro Fermi - Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi' Rome Italy Department of Physics Aligarh Muslim University Aligarh India Korea Institute of Science and Technology Information Daejeon Republic of Korea Yale University New Haven Connecticut United States Institute for Theoretical and Experimental Physics Moscow Russia Research Division and ExtreMe Matter Institute EMMI GSI Helmholtzzentrum für Schwerionenforschung GmbH Darmstadt Germany Universidade Estadual de Campinas (UNICAMP) Campinas Brazil National Research Centre Kurchatov Institute Moscow Russia INFN Sezione di Torino Turin Italy Central China Normal University Wuhan China Instituto de Física Universidad Nacional Autónoma de México Mexico City Mexico COMSATS University Islamabad Islamabad Pakistan INFN Sezione di Bologna Bologna Italy Dipartimento di Fisica e Astronomia dell'Università and Sezione INFN Bologna Italy Bogolyubov Institute for Theoretical Physics National Academy of Sciences of Ukraine Kiev Ukraine Department of Physics and Technology University of Bergen Bergen Norway Institut für Kernphysik Johann Wolfgang Goethe-Universität Frankfurt Frankfurt Germany St. Petersburg State University St. Petersburg Russia Horia Hulubei National Institute of Physics and Nuclear Engineering Bucharest Romania School of Physics and Astronomy University of Birmingham Birmingham United Kingdom Westfälische Wilhelms-Uni

The correlations of identical charged kaons were measured in p-Pb collisions at sNN=5.02 TeV by the ALICE experiment at the LHC. The femtoscopic invariant radii and correlation strengths were extracted from one-dimensional kaon correlation functions and were compared with those obtained in pp and Pb-Pb collisions at s=7 TeV and sNN=2.76 TeV, respectively. The presented results also complement the identical-pion femtoscopic data published by the ALICE collaboration. The extracted radii increase with increasing charged-particle multiplicity and decrease with increasing pair transverse momentum. At comparable multiplicities, the radii measured in p-Pb collisions are found to be close to those observed in pp collisions. The obtained femtoscopic parameters are reproduced by the EPOS 3 hadronic interaction model and disfavor models with large initial size or strong collective expansion at low multiplicities.

关键词： Particle interactions Relativistic heavy-ion collisions

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Performance Comparison of Binary Modulation Schemes for Visible Light Communication

Performance Comparison of Binary Modulation Schemes for Visi...

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IEEE International Conference on Communications

作者： Ki-Hong Park Changping Li Mohamed-Slim Alouini Electrical Engineering Program Computer Electrical and Mathematical Sciences and Engineering Division King Abdullah University of Science and Technology

ISBN: (纸本)9781467364300

In this paper, we investigate the power spectral density of several binary modulation schemes including variable on-off keying, variable pulse position modulation, and pulse dual slope modulation which were previously proposed for visible light communication with dimming control. We also propose a novel slope-based modulation called differential chip slope modulation (DCSM) and develop a chip-based hard-decision receiver to demodulate the resulting signal, detect the chip sequence, and decode the input bit sequence. We show that the DCSM scheme can exploit spectrum density more efficiently than the reference schemes while providing an error rate performance comparable to them.

关键词： Modulation Correlation Bit error rate Optical receivers Optical pulses Optical fiber networks

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Ground-wave propagation characterization and prediction for HF cognitive radio 34

Ground-wave propagation characterization and prediction for ...

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34th Annual IEEE Military Communications Conference, MILCOM 2015

作者： Conway, Michael J. Payne, Christopher J. Bilén, Sven G. Koski, Eric N. School of Electrical Engineering and Computer Science Pennsylvania State University University ParkPA16802 United States Harris Corporation RF Communications Division RochesterNY14610 United States

ISBN: (纸本)9781509000739

Various high-frequency (HF) ground-wave propagation models are evaluated by comparing the models' path-loss estimates with field measurements. Multiple sources of ground conductivity and permittivity information and various methods for estimating terrain effects are employed, with the goal of approximating the measured path-loss values as accurately as possible. Estimates are obtained using the Rotheram-Millington spherical-Earth model as well as models that take the path's terrain profile into account, including a simple clearance angle model and more elaborate models estimating knife-edge diffraction loss using the methods of Bullington, Epstein-Peterson, and Deygout. Ground conductivity and permittivity values are obtained from standard ITU conductivity maps or directly measured at the transmit and receive locations. The Google Maps API is used to provide the terrain profile across each link. The resulting improvements in ground-wave path-loss estimation will contribute to more effective communications planning in HF radio networks, and to defining realistic scenarios for simulation studies of MANET protocols and cognitive radio techniques for use at HF. © 2015 IEEE.

关键词： Cognitive radio

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On radiocoloring hierarchically specified planar graphs: PSPACE-completeness and approximations

On radiocoloring hierarchically specified planar graphs: PSP...

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European Symposium on Algorithms, ESA 2015

作者： Andreou, Maria Fotakis, Dimitris Lesta, Vicky Papadopoulou Nikoletseas, Sotiris Spirakis, Paul Professional Training Centre TC Square Ltd Nicosia Cyprus Division of Computer Science School of Electrical and Computer Engineering National Technical University of Athens Athens Greece Department of Computer Science and Engineering European University Cyprus Egkomi Cyprus University of Patras Patras Greece Department of Computer Science University of Liverpool Liverpool United Kingdom Department of Computer Engineering and Informatics University of Patras Patras Greece Computer Technology Institute and Press Diophantus Patras Greece

ISBN: (纸本)9783319240237

Hierarchical specifications of graphs have been widely used in many important applications, such as VLSI design, parallel programming and software engineering. A well known hierarchical specification model, considered in this work, is that of Lengauer [21,22], referred to as L-specifications. In this paper we discuss a restriction on the L-specifications resulting to graphs which we call Well-Separated (WS). This class is recognized in polynomial time. In this work we study the Radiocoloring Problem (RCP) on WS L-specified hierarchical planar graphs. The optimization version of RCP studied here, consists in assigning colors to the vertices of a graph, such that any two vertices of distance at most two get different colors. The objective here is to minimize the number of colors used. We first show that RCP is PSPACE-complete for WS L-specified hierarchical planar graphs. Second, we present a polynomial time 3-approximation algorithm as well as a more efficient asymptotic 10/3- approximation algorithm for RCP on graphs of this class. We note that, the best currently known approximation ratio for the RCP on ordinary (non-hierarchical) planar graphs of general degree is 5/3 asymptotically ([27,28]). © Springer International Publishing Switzerland 2015.

关键词： Color

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TID and SEE hardened n-MOSFET layout on a bulk silicon substrate which combines a DGA n-MOSFET and a guard drain

TID and SEE hardened n-MOSFET layout on a bulk silicon subst...

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IEEE Symposium on Nuclear science (NSS/MIC)

作者： Tak Roh Young Chul Lee Hee Division of Electrical Engineering School of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology Daejeon Daejeon KR

A new n-MOSFET layout on a bulk silicon substrate proposed for TID and SEE radiation tolerance combing a DGA n-MOSFET and a guard drain. The proposed n-MOSFET layout consists of a p+ and a p-active layer on the source-to-drain sidewall to prevent the development of a leakage path between the source and the drain, a dummy gate on the side drain/source to avoid the development of a leakage path between two MOSFETs, and a guard drain on the side dummy gate to reduce the SEE effect. The proposed n-MOSFET layout was found to eliminate all radiation-induced leakage current paths and to reduce SEE pulse to 35.36% in comparison with the conventional n-MOSFET. The simulation results demonstrated that the proposed n-MOSFET structure on the bulk silicon substrate performs well even when the fixed charge density increases and energetic protons are injected. These results confirm that the proposed n-MOSFET on the bulk silicon substrate is radiation-tolerant.

关键词： MOSFET circuits Layout Logic gates Silicon MOSFET Substrates Protons

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Monitoring and detecting atrial fibrillation using wearable technology

Monitoring and detecting atrial fibrillation using wearable ...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： Shamim Nemati Mohammad M. Ghassemi Vaidehi Ambai Nino Isakadze Oleksiy Levantsevych Amit Shah Gari D. Clifford Dept of Biomedical Informatics Emory University Atlanta GA Dept. of Electrical Engineering and Computer Science MIT Cambrige MA Philadelnhia Collece of Osteonathic Medicine Suwanee GA Dept of Medicine School of Medicine Atlanta GA Division of Cardiolosv Veterans Affairs Hosoital Atlanta GA Dept of Epidemiology Emory University Atlanta GA Dept of Biomedical Engineering Georgia Institute of Technology Atlanta GA

Atrial fibrillation (AFib) is diagnosed by analysis of the morphological and rhythmic properties of the electrocardiogram. It was recently shown that accurate detection of AFib is possible using beat-to-beat interval variations. This raises the question of whether AFib detection can be performed using a pulsatile waveform such as the Photoplethysmogram (PPG). The recent explosion in use of recreational and professional ambulatory wrist-based pulse monitoring devices means that an accurate pulse-based AFib screening algorithm would enable large scale screening for silent or undiagnosed AFib, a significant risk factor for multiple diseases. We propose a noise-resistant machine learning approach to detecting AFib from noisy ambulatory PPG recorded from the wrist using a modern research watch-based wearable device (the Samsung Simband). Ambulatory pulsatile and movement data were recorded from 46 subjects, 15 with AFib and 31 non symptomatic. Single channel electrocardiogram (ECG), multi-wavelength PPG and tri-axial accelerometry were recorded simultaneously at 128 Hz from the non-dominant wrist using the Simband. Recording lengths varied from 3.5 to 8.5 minutes. Pulse (beat) detection was performed on the PPG waveforms, and eleven features were extracted based on beat-to-beat variability and waveform signal quality. Using 10-fold cross validation, an accuracy of 95 % on out-of-sample data was achieved, with a sensitivity of 97%, specificity of 94%, and an area under the receiver operating curve (AUROC) of 0.99. The described approach provides a noise-resistant, accurate screening tool for AFib from PPG sensors located in an ambulatory wrist watch. To our knowledge this is the first study to demonstrate an algorithm with a high enough accuracy to be used in general population studies that does not require an ambulatory Holter electrocardiographic monitor.

关键词： Biomedical monitoring Electrocardiography Feature extraction Hospitals Monitoring Sensitivity Standards

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Enhanced brain storm optimization algorithm for wireless sensor networks deployment 6th

Enhanced brain storm optimization algorithm for wireless sen...

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6th International Conference on Swarm Intelligence, ICSI 2015 held in conjunction with the 2nd BRICS Congress on Computational Intelligence, CCI 2015

作者： Chen, Junfeng Cheng, Shi Chen, Yang Xie, Yingjuan Shi, Yuhui College of IOT Engineering Hohai University Changzhou213022 China Division of Computer Science University of Nottingham Ningbo Ningbo China College of Science and Technology Ningbo University Ningbo China Department of Electrical and Electronic Engineering Xi’an Jiaotong-Liverpool University Suzhou China

ISBN: (纸本)9783319204659

Brain storm optimization is a young and promising swarm intelligence algorithm, which simulates the human brainstorming process. The convergent operation and divergent operation are two basic operators of the brain storm optimization. The k means clustering is utilized in the original brain storm optimization, which needs to define the k value before the search. To adaptively change the number of clusters during the search, a modified Affinity Propagation (AP) clustering method and an enhanced creating strategy are proposed on account of the structure information of single or multiple clusters. In addition, the modified brain storm optimization is applied to optimize the dynamic deployments of two different wireless sensor networks (WSN). Experimental results show that the proposed algorithm achieves satisfactory results and guarantees a high coverage rate. © Springer International Publishing Switzerland 2015.

关键词： Wireless sensor networks

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OPNET/simulink based testbed for disturbance detection in the smart grid 15

OPNET/simulink based testbed for disturbance detection in th...

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10th Annual Cyber and Information Security Research Conference, CISRC 2015

作者： Sadi, Mohammad Ashraf Hossain Ali, Mohd. Hassan Dasgupta, Dipankar Abercrombie, Robert K. Electrical and Computer Engineering Department University of Memphis United States Computer Science Department University of Memphis MemphisTN38152-3240 United States Computational Sciences and Engineering Division Oak Ridge National Laboratory Oak RidgeTN37831-6085 United States

ISBN: (纸本)9781450333450

The important backbone of the Smart Grid is the cyber/information infrastructure, which is primarily used to communicate with different grid components. Smart grid is a complex cyber physical system containing a numerous and variety number of sources, devices, controllers and loads. Therefore, smart grid is vulnerable to the grid related disturbances. For such a dynamic system, disturbance and intrusion detection is a paramount issue. This paper presents a Simulink and Opnet based co-simulated platform to carry out a cyber-intrusion in a cybernetwork for modern power systems and smart grid. The IEEE 30 bus power system model is used to demonstrate the effectiveness of the simulated testbed. The experiments were performed by disturbing the circuit breakers reclosing time through a cyberattack. Different disturbance situations in the considered test system are considered and the results indicate the effectiveness of the proposed co-simulated scheme. © 2015 ACM.

关键词： Smart power grids

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Construction of KAGRA: An underground gravitational wave observatory

arXiv

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arXiv 2017年

作者： Akutsu, T. Ando, M. Araki, S. Araya, A. Arima, T. Aritomi, N. Asada, H. Aso, Y. Atsuta, S. Awai, K. Baiotti, L. Barton, M.A. Chen, D. Cho, K. Craig, K. DeSalvo, R. Doi, K. Eda, K. Enomoto, Y. Flaminio, R. Fujibayashi, S. Fujii, Y. Fujimoto, M.-K. Fukushima, M. Furuhata, T. Hagiwara, A. Haino, S. Harita, S. Hasegawa, K. Hasegawa, M. Hashino, K. Hayama, K. Hirata, N. Hirose, E. Ikenoue, B. Inoue, Y. Ioka, K. Ishizaki, H. Itoh, Y. Jia, D. Kagawa, T. Kaji, T. Kajita, T. Kakizaki, M. Kakuhata, H. Kamiizumi, M. Kanbara, S. Kanda, N. Kanemura, S. Kaneyama, M. Kasuya, J. Kataoka, Y. Kawaguchi, K. Kawai, N. Kawamura, S. Kawazoe, F. Kim, C. Kim, J. Kim, J.C. Kim, W. Kimura, N. Kitaoka, Y. Kobayashi, K. Kojima, Y. Kokeyama, K. Komori, K. Kotake, K. Kubo, K. Kumar, R. Kume, T. Kuroda, K. Kuwahara, Y. Lee, H.-K. Lee, H.-W. Lin, C.-Y. Liu, Y. Majorana, E. Mano, S. Marchio, M. Matsui, T. Matsumoto, N. Matsushima, F. Michimura, Y. Mio, N. Miyakawa, O. Miyake, K. Miyamoto, A. Miyamoto, T. Miyo, K. Miyoki, S. Morii, W. Morisaki, S. Moriwaki, Y. Muraki, Y. Murakoshi, M. Musha, M. Nagano, K. Nagano, S. Nakamura, K. Nakamura, T. Nakano, H. Nakano, M. Nakano, M. Nakao, H. Nakao, K. Narikawa, T. Ni, W.-T. Nonomura, T. Obuchi, Y. Oh, J.J. Oh, S.-H. Ohashi, M. Ohishi, N. Ohkawa, M. Ohmae, N. Okino, K. Okutomi, K. Ono, K. Ono, Y. Oohara, K. Ota, S. Park, J. Peña Arellano, F.E. Pinto, I.M. Principe, M. Sago, N. Saijo, M. Saito, T. Saito, Y. Saitou, S. Sakai, K. Sakakibara, Y. Sasaki, Y. Sato, S. Sato, T. Sato, Y. Sekiguchi, T. Sekiguchi, Y. Shibata, M. Shiga, K. Shikano, Y. Shimoda, T. Shinkai, H. Shoda, A. Someya, N. Somiya, K. Son, E.J. Starecki, T. Suemasa, A. Sugimoto, Y. Susa, Y. Suwabe, H. Suzuki, T. Tachibana, Y. Tagoshi, H. Takada, S. Takahashi, H. Takahashi, R. Takamori, A. Takeda, H. Tanaka, H. Tanaka, K. Tanaka, T. Tatsumi, D. National Astronomical Observatory of Japan Tokyo181-8588 Japan Graduate School of Science University of Tokyo Tokyo113-0033 Japan Department of Physics Graduate School of Science University of Tokyo Tokyo113-0033 Japan Ibaraki305-0801 Japan Earthquake Research Institute University of Tokyo Tokyo113-0032 Japan Department of Physics Graduate School of Science Osaka City University Osaka558-8585 Japan Graduate School of Science and Technology Hirosaki University Aomori036-8561 Japan Department of Physics Graduate School of Science and Engineering Tokyo Institute of Technology Tokyo152-8551 Japan Institute for Cosmic Ray Research University of Tokyo Chiba277-8582 Japan Institute for Cosmic Ray Research University of Tokyo Gifu506-1205 Japan Graduate School of Science Osaka University Osaka560-0043 Japan Department of Physics Sogang University Seoul121-742 Korea Republic of University of Sannio at Benevento BeneventoI-82100 Italy Sezione di Napoli NapoliI-80126 Italy University of Toyama Toyama930-8555 Japan Department of Physics Graduate School of Science Kyoto University Kyoto606-8502 Japan Institute of Physics Academia Sinica Taipei11529 Taiwan University of Toyama Toyama930-8555 Japan Yukawa Institute for Theoretical Physics Kyoto University Kyoto606-8502 Japan Albert-Einstein-Institut Max-Planck-Institut für Gravitationsphysik HannoverD-30167 Germany Department of Physics and Astronomy Seoul National University Seoul151-742 Korea Republic of Daejeon34055 Korea Republic of Department of Physics Myongji University Yongin449-728 Korea Republic of Department of Computer Simulation Inje University Gimhae-shi50834 Korea Republic of Daejeon34047 Korea Republic of Department of Physical Science Graduate School of Science Hiroshima University Hiroshima903-0213 Japan Department of Applied Physics Graduate School of Science Fukuoka University Fukuoka814-0180 Japan Graduate School of Science and Engineer

Major construction and initial-phase operation of a second-generation gravitational-wave detector KAGRA has been completed. The entire 3-km detector is installed underground in a mine in order to be isolated from background seismic vibrations on the surface. This allows us to achieve a good sensitivity at low frequencies and high stability of the detector. Bare-bones equipment for the interferometer operation has been installed and the first test run was accomplished in March and April of 2016 with a rather simple configuration. The initial configuration of KAGRA is named iKAGRA. In this paper, we summarize the construction of KAGRA, including the study of the advantages and challenges of building an underground detector and the operation of the iKAGRA interferometer together with the geophysics interferometer that has been constructed in the same tunnel. Copyright © 2017, The Authors. All rights reserved.

关键词： Interferometers

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Charged jet cross section and fragmentation in proton-proton collisions at s=7 TeV

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physical Review D 2019年第1期99卷 012016-012016页

作者： S. Acharya D. Adamová A. Adler J. Adolfsson M. M. Aggarwal G. Aglieri Rinella M. Agnello N. Agrawal Z. Ahammed S. U. Ahn S. Aiola A. Akindinov M. Al-Turany S. N. Alam D. S. D. Albuquerque D. Aleksandrov B. Alessandro R. Alfaro Molina Y. Ali A. Alici A. Alkin J. Alme T. Alt L. Altenkamper I. Altsybeev M. N. Anaam C. Andrei D. Andreou H. A. Andrews A. Andronic M. Angeletti V. Anguelov C. Anson T. Antičić F. Antinori P. Antonioli R. Anwar N. Apadula L. Aphecetche H. Appelshäuser S. Arcelli R. Arnaldi O. W. Arnold I. C. Arsene M. Arslandok A. Augustinus R. Averbeck M. D. Azmi A. Badalà Y. W. Baek S. Bagnasco R. Bailhache R. Bala A. Baldisseri M. Ball R. C. Baral A. M. Barbano R. Barbera F. Barile L. Barioglio G. G. Barnaföldi L. S. Barnby V. Barret P. Bartalini K. Barth E. Bartsch N. Bastid S. Basu G. Batigne B. Batyunya P. C. Batzing J. L. Bazo Alba I. G. Bearden H. Beck C. Bedda N. K. Behera I. Belikov F. Bellini H. Bello Martinez R. Bellwied L. G. E. Beltran V. Belyaev G. Bencedi S. Beole A. Bercuci Y. Berdnikov D. Berenyi R. A. Bertens D. Berzano L. Betev P. P. Bhaduri A. Bhasin I. R. Bhat H. Bhatt B. Bhattacharjee J. Bhom A. Bianchi L. Bianchi N. Bianchi J. Bielčík J. Bielčíková A. Bilandzic G. Biro R. Biswas S. Biswas J. T. Blair D. Blau C. Blume G. Boca F. Bock A. Bogdanov L. Boldizsár M. Bombara G. Bonomi M. Bonora H. Borel A. Borissov M. Borri E. Botta C. Bourjau L. Bratrud P. Braun-Munzinger M. Bregant T. A. Broker M. Broz E. J. Brucken E. Bruna G. E. Bruno D. Budnikov H. Buesching S. Bufalino P. Buhler P. Buncic O. Busch Z. Buthelezi J. B. Butt J. T. Buxton J. Cabala D. Caffarri H. Caines A. Caliva E. Calvo Villar R. S. Camacho P. Camerini A. A. Capon W. Carena F. Carnesecchi J. Castillo Castellanos A. J. Castro E. A. R. Casula C. Ceballos Sanchez S. Chandra B. Chang W. Chang S. Chapeland M. Chartier S. Chattopadhyay A. Chauvin C. Cheshkov B. Cheynis V. Chibante Barroso D. D. Chinellato S. Cho P. Chochula T. Chowdhury P. Christakoglou C. H. Christensen P. Christiansen T. Chujo S. U. Chung C. Cicalo L. Cifa Variable Energy Cyclotron Centre Homi Bhabha National Institute Kolkata India Nuclear Physics Institute of the Czech Academy of Sciences Řež u Prahy Czech Republic Johann-Wolfgang-Goethe Universität Frankfurt Institut für Informatik Fachbereich Informatik und Mathematik Frankfurt Germany Lund University Department of Physics Division of Particle Physics Lund Sweden Physics Department Panjab University Chandigarh India European Organization for Nuclear Research (CERN) Geneva Switzerland Dipartimento DISAT del Politecnico and Sezione INFN Turin Italy Indian Institute of Technology Bombay (IIT) Mumbai India Korea Institute of Science and Technology Information Daejeon Republic of Korea Yale University New Haven Connecticut USA Institute for Theoretical and Experimental Physics Moscow Russia Research Division and ExtreMe Matter Institute EMMI GSI Helmholtzzentrum für Schwerionenforschung GmbH Darmstadt Germany Universidade Estadual de Campinas (UNICAMP) Campinas Brazil National Research Centre Kurchatov Institute Moscow Russia INFN Sezione di Torino Turin Italy Instituto de Física Universidad Nacional Autónoma de México Mexico City Mexico COMSATS Institute of Information Technology (CIIT) Islamabad Pakistan Centro Fermi—Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi’ Rome Italy Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN Bologna Italy INFN Sezione di Bologna Bologna Italy Bogolyubov Institute for Theoretical Physics National Academy of Sciences of Ukraine Kiev Ukraine Department of Physics and Technology University of Bergen Bergen Norway Institut für Kernphysik Johann Wolfgang Goethe-Universität Frankfurt Frankfurt Germany St. Petersburg State University St. Petersburg Russia Central China Normal University Wuhan China Horia Hulubei National Institute of Physics and Nuclear Engineering Bucharest Romania School of Physics and Astronomy University of Birmingham Birmingham United Kingdom Westfälische Wilhelms

We report the differential charged jet cross section and jet fragmentation distributions measured with the ALICE detector in proton-proton collisions at a center-of-mass energy s=7 TeV. Jets with pseudorapidity |η|<0.5 are reconstructed from charged particles using the anti-kT jet-finding algorithm with a resolution parameter R=0.4. The jet cross section is measured in the transverse momentum interval 5≤pTch jet<100 GeV/c. Jet fragmentation is studied measuring the scaled transverse momentum spectra of the charged constituents of jets in four intervals of jet transverse momentum between 5 and 30 GeV/c. The measurements are compared to calculations from the pythia model as well as next-to-leading-order perturbative QCD calculations with powheg+pythia8. The charged jet cross section is well described by powheg for the entire measured range of pTch jet. For pTch jet>40 GeV/c, the pythia calculations also agree with the measured charged jet cross section. pythia6 simulations describe the fragmentation distributions to 15%. Larger discrepancies are observed for pythia8.

关键词： Relativistic heavy-ion collisions

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