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作者： Zhang, Yafang Ni, Jianbing Tao, Xiaoling Wang, Yong Yu, Yong Big Data Research Center School of Computer Science and Engineering University of Electronic Science and Technology of China Chengdu611731 China State Key Laboratory of Information Security Institute of Information Engineering Chinese Academy of Sciences Beijing100093 China Department of Electrical and Computer Engineering University of Waterloo WaterlooONN2L 3G1 Canada College of Information and Communication Guilin University of Electronic Technology Guilin541004 China Guangxi Cloud Security and Cloud Service Engineering Research Center Guilin University of Electronic Technology Guilin541004 China

Cloud storage has been gaining tremendous popularity among individuals and corporations because of its low maintenance cost and on-demand services for the clients. To improve the availability and the reliability of critical data, storing multiple replicas on multiple servers is a commonly used strategy. Currently, several provable data possession (PDP) protocols for multiple replicas of dynamic data have been proposed to ensure the integrity of outsourced multi-copy data, but the efficiency of these protocols on verifying multiple replicas one by one is not satisfactory. In this paper, we propose a provable multiple replication data possession protocol with full dynamics, named MR-DPDP. In MR-DPDP, we utilize a novel authenticated data structure called Merkle hash tree with rank to support both full dynamic data updates and efficient integrity verification. In addition, our construction with RSA signature can support both variable-sized file blocks and public verification. Through security proof and performance evaluation, we demonstrate that MR-DPDP not only is sound but also incurs less communication overhead when updating data blocks as well as verifying a proof of the integrity of multiple replicas. Copyright © 2015 John Wiley & Sons, Ltd.

关键词： Cloud storage

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research on Digital Output Verification technology of Electronic DC Current Transformer

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IOP Conference Series: Materials science and engineering 2017年第1期199卷

作者： Yuanjie Chen Bin Wang Haoliang Hu Qianzhu Xiong Chunyan Yang College of Information Science and Engineering Wuhan University of Science and Technology Wuhan 430081 China China Electric Power Research Institute Wuhan 430074 China

Aiming at the error of calibration system when conducting field calibration by electronic DC current transformer's digital calibration system, an electronic DC current transformer's digital calibration system based on protocol conversion is proposed and researched. data frames outputted from merging unit are collected and converted by the system, the digital synchronization is realized by using the synchronous clock device to trigger the second pulse, and it is verified by the virtual instrument design software. The field calibration is conducted to some converter station digital dc current transformer under the rated current of 500A by using the calibration system. By calibrating and analyzing errors, the error is less than 0.075% when tested current is more than 40% of the rated current. According the standard in literature[1], performance of the calibration system is perfect, measured results perfectly meet the requirements of design, and the calibration system has great practical application value.

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Utilizing Cat Swarm Optimization in Allocating the Sink Node in the Wireless Sensor Network Environment 3

Utilizing Cat Swarm Optimization in Allocating the Sink Node...

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3rd International Conference on Computing Measurement Control and Sensor Network, CMCSN 2016

作者： Tsai, Pei-Wei Kong, Lingping Vaclav, Snasel Pan, Jeng-Shyang Istanda, Vaci Hu, Zhi-Yong College of Information Science and Engineering Fujian University of Technology Fuzhou China Fujian Provincial Key Laboratory of Big Data Mining and Applications Fujian University of Technology Fuzhou China Innovative Information Industry Research Center Harbin Institute of Technology Shenzhen Graduate School Shenzhen China Department of Computer Science VSB Technical University of Ostrava Ostrava Czech Republic Council of Indigenous Peoples Executive Yuan New Taipei City Taiwan

ISBN: (纸本)9781509010936

A general wireless sensor network (WSN) is a system composed of a large number of sensor nodes. In the WSN system, all sensor nodes are responsible for sensing the interested events and transmitting the related information back to the sink node. The sink node acts like the brain of the whole WSN system for processing the collected data and giving control commands. The position of the sink node directly affects the data transmission efficiency and the distance from the terminal sensor node to the sink node. Thus, choosing the correct place to place the sink node in the whole network is a delicate work. In this paper, we propose a sink node placement method by proposing a newly designed object function and utilizing Cat Swarm Optimization (CSO) to find out the near best location for placing the sink node. The simulation results indicate that our proposed method presents good performance compared with the conventional Particle Swarm Optimization (PSO) algorithm in reducing the overall energy consumption and prolongs the lifetime of network in an efficient way. © 2016 IEEE.

关键词： Sensor nodes

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A Multi-Source Approach for Bug Triage

A Multi-Source Approach for Bug Triage

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作者： Liu, Jin Tian, Yiqiuzi Yu, Xiao Yang, Zhijiang Jia, Xiangyang Ma, Chuanxiang Xu, Zheng State Key Laboratory of Software Engineering School of Computer Science Wuhan University Wuhan Hubei China Guangxi Key Laboratory of Trusted Software Guilin University of Electronic Technology Guilin Guangxi China Department of Computer Science Western Michigan University KalamazooMI49008-5466 United States School of Computer Science and Information Engineering Hubei University Wuhan Hubei China Third Research Institute of Ministry of Public Security Shanghai201204 China

Bug triaging refers to the process of assigning a bug to the most appropriate fixer. As the scale and complexity of software increases, bug triaging becomes a tedious and time-consuming work. Existing bug triaging approaches typically treat it as a problem of optimizing recommendation accuracy. However, the time that different fixers may spend also varies. Thus, we take time cost as another optimizing objective aside from accuracy and use modern portfolio theory to strike a balance between them. In addition, for fixers with little fixing records, we need more data to build profiles about their expertise. To address these problems, we propose a bug triaging approach with awareness of accuracy and time cost, and we use bug reports from other projects to enrich the bug fixing history of fixers. We evaluate our approach with experiments on data collected from Bugzilla. The experiment results validate the effectiveness of our approach. © 2016 World Scientific Publishing Company.

关键词： Costs

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Gamma-ray showers observed at ground level in coincidence with downward lightning leaders

arXiv

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arXiv 2017年

作者： Abbasi, R.U. Abu-Zayyad, T. Allen, M. Barcikowski, E. Belz, J.W. Bergman, D.R. Blake, S.A. Byrne, M. Cady, R. Cheon, B.G. Chiba, J. Chikawa, M. Fujii, T. Fukushima, M. Furlich, G. Goto, T. Hanlon, W. Hayashi, Y. Hayashida, N. Hibino, K. Honda, K. Ikeda, D. Inoue, N. Ishii, T. Ito, H. Ivanov, D. Jeong, S. Jui, C.C.H. Kadota, K. Kakimoto, F. Kalashev, O. Kasahara, K. Kawai, H. Kawakami, S. Kawata, K. Kido, E. Kim, H.B. Kim, J.H. Kim, J.H. Kishigami, S.S. Krehbiel, P.R. Kuzmin, V. Kwon, Y.J. Lan, J. LeVon, R. Lundquist, J.P. Machida, K. Martens, K. Matuyama, T. Matthews, J.N. Minamino, M. Mukai, K. Myers, I. Nagataki, S. Nakamura, R. Nakamura, T. Nonaka, T. Ogio, S. Ohnishi, M. Ohoka, H. Oki, K. Okuda, T. Ono, M. Onogi, R. Oshima, A. Ozawa, S. Park, I.H. Pshirkov, M.S. Remington, J. Rison, W. Rodeheffer, D. Rodriguez, D.C. Rubtsov, G. Ryu, D. Sagawa, H. Saito, K. Sakaki, N. Sakurai, N. Seki, T. Sekino, K. Shah, P.D. Shibata, F. Shibata, T. Shimodaira, H. Shin, B.K. Shin, H.S. Smith, J.D. Sokolsky, P. Springer, R.W. Stokes, B.T. Stroman, T.A. Takai, H. Takeda, M. Takeishi, R. Taketa, A. Takita, M. Tameda, Y. Tanaka, H. Tanaka, K. Tanaka, M. Thomas, R.J. Thomas, S.B. Thomson, G.B. Tinyakov, P. Tkachev, I. Tokuno, H. Tomida, T. Troitsky, S. Tsunesada, Y. Uchihori, Y. Udo, S. Urban, F. Vasiloff, G. Wong, T. Yamamoto, M. Yamane, R. Yamaoka, H. Yamazaki, K. Yang, J. Yashiro, K. Yoneda, Y. Yoshida, S. Yoshii, H. Zundel, Z. High Energy Astrophysics Institute Department of Physics and Astronomy University of Utah Salt Lake CityUT United States 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 Research Institute of Natural Science Hanyang University Seongdong-gu Seoul Korea Republic of Department of Physics Tokyo University of Science Chiba Noda Japan Department of Physics Kinki University Osaka Higashi Osaka Japan Institute for Cosmic Ray Research University of Tokyo Chiba Kashiwa Japan Todai Institutes for Advanced Study University of Tokyo Chiba Kashiwa Japan Graduate School of Science Osaka City University Osaka Osaka Japan Faculty of Engineering Kanagawa University Kanagawa Yokohama Japan Interdisciplinary Graduate School of Medicine and Engineering University of Yamanashi Yamanashi Kofu Japan Astrophysical Big Bang Laboratory RIKEN Saitama Wako Japan Department of Physics Sungkyunkwan University Jang-an-gu Suwon Korea Republic of Department of Physics Tokyo City University Setagaya-ku Tokyo Japan National Nuclear Research University Moscow Engineering Physics Institute 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 Republic of Langmuir Laboratory for Atmospheric Research New Mexico Institute of Mining and Technology SocorroNM87801 United States Department of Physics Yonsei University Seodaemun-gu Seoul Korea Republic of Institute of Particle and Nuclear Studies KEK Ibaraki Tsukuba Japan Faculty of Science Kochi University Kochi Kochi Japan Department of Physical Sciences Ritsumeikan University Shiga Kusatsu Japan Department of Physics Kyushu Un

Bursts of gamma ray showers have been observed in coincidence with downward propagating negative leaders in lightning flashes by the Telescope Array Surface Detector (TASD). The TASD is a 700 square kilometer cosmic ray observatory located in southwestern Utah, U.S.A. In data collected between 2014 and 2016, correlated observations showing the structure and temporal development of three shower-producing flashes were obtained with a 3D lightning mapping array, and electric field change measurements were obtained for an additional seven flashes, in both cases co-located with the TASD. National Lightning Detection Network (NLDN) information was also used throughout. The showers arrived in a sequence of 2–5 short-duration (≤10 µs) bursts over time intervals of several hundred microseconds, and originated at an altitude of 3–5 kilometers above ground level during the first 1–2 ms of downward negative leader breakdown at the beginning of cloud-to-ground lightning flashes. The shower footprints, associated waveforms and the effect of atmospheric propagation indicate that the showers consist primarily of downward-beamed gamma radiation. This has been supported by GEANT simulation studies, which indicate primary source fluxes of 1012–1014 photons for 16◦ half-angle beams. We conclude that the showers are terrestrial gamma-ray flashes (TGFs), similar to those observed by satellites, but that the ground-based observations are more representative of the temporal source activity and are also more sensitive than satellite observations, which detect only the most powerful TGFs. Copyright © 2017, The Authors. All rights reserved.

关键词： Gamma rays

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Erratum to: Measurement of the CKM angle γ using B ± → DK ± with D → K S 0 π + π −, K S 0 K + K − decays

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Journal of High Energy Physics 2018年第10期2018卷 1-7页

作者： Aaij, R. Adeva, B. Adinolfi, M. Aidala, C. A. Ajaltouni, Z. Akar, S. Albicocco, P. Albrecht, J. Alessio, F. Alexander, M. Alfonso Albero, A. Ali, S. Alkhazov, G. Alvarez Cartelle, P. Alves, A. A. Amato, S. Amerio, S. Amhis, Y. An, L. Anderlini, L. Andreassi, G. Andreotti, M. Andrews, J. E. Appleby, R. B. Archilli, F. d’Argent, P. Arnau Romeu, J. Artamonov, A. Artuso, M. Arzymatov, K. Aslanides, E. Atzeni, M. Bachmann, S. Back, J. J. Baker, S. Balagura, V. Baldini, W. Baranov, A. Barlow, R. J. Barsuk, S. Barter, W. Baryshnikov, F. Batozskaya, V. Batsukh, B. Battista, V. Bay, A. Beddow, J. Bedeschi, F. Bediaga, I. Beiter, A. Bel, L. J. Beliy, N. Bellee, V. Belloli, N. Belous, K. Belyaev, I. Ben-Haim, E. Bencivenni, G. Benson, S. Beranek, S. Berezhnoy, A. Bernet, R. Berninghoff, D. Bertholet, E. Bertolin, A. Betancourt, C. Betti, F. Bettler, M. O. van Beuzekom, M. Bezshyiko, Ia. Bhasin, S. Bhom, J. Bifani, S. Billoir, P. Birnkraut, A. Bizzeti, A. Bjørn, M. Blago, M. P. Blake, T. Blanc, F. Blusk, S. Bobulska, D. Bocci, V. Boente Garcia, O. Boettcher, T. Bondar, A. Bondar, N. Borghi, S. Borisyak, M. Borsato, M. Bossu, F. Boubdir, M. Bowcock, T. J. V. Bozzi, C. Braun, S. Brodski, M. Brodzicka, J. Brundu, D. Buchanan, E. Buonaura, A. Burr, C. Bursche, A. Buytaert, J. Byczynski, W. Cadeddu, S. Cai, H. Calabrese, R. Calladine, R. Calvi, M. Calvo Gomez, M. Camboni, A. Campana, P. Campora Perez, D. H. Capriotti, L. Carbone, A. Carboni, G. Cardinale, R. Cardini, A. Carniti, P. Carson, L. Carvalho Akiba, K. Casse, G. Cassina, L. Cattaneo, M. Cavallero, G. Cenci, R. Chamont, D. Chapman, M. G. Charles, M. Charpentier, Ph. Chatzikonstantinidis, G. Chefdeville, M. Chekalina, V. Chen, C. Chen, S. Chitic, S.-G. Chobanova, V. Chrzaszcz, M. Chubykin, A. Ciambrone, P. Cid Vidal, X. Ciezarek, G. Clarke, P. E. L. Clemencic, M. Cliff, H. V. Closier, J. Coco, V. Cogan, J. Cogneras, E. Cojocariu, L. Collins, P. Colombo, T. Comerma-Montells, A. Contu, A. Coombs, G. Coquereau, S. Corti, G. Corvo, M. Costa Sobral, C. M. Couturier, B. Cowan, G Nikhef National Institute for Subatomic Physics Amsterdam Netherlands Instituto Galego de Física de Altas Enerxías (IGFAE) Universidade de Santiago de Compostela Santiago de Compostela Spain H.H. Wills Physics Laboratory University of Bristol Bristol United Kingdom University of Michigan Ann Arbor United States Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France University of Cincinnati Cincinnati United States INFN Laboratori Nazionali di Frascati Frascati Italy Fakultät Physik Technische Universität Dortmund Dortmund Germany European Organization for Nuclear Research (CERN) Geneva Switzerland School of Physics and Astronomy University of Glasgow Glasgow United Kingdom ICCUB Universitat de Barcelona Barcelona Spain Petersburg Nuclear Physics Institute (PNPI) Gatchina Russia Imperial College London London United Kingdom Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil INFN Sezione di Padova Padova Italy LAL Univ. Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay France Center for High Energy Physics Tsinghua University Beijing China INFN Sezione di Firenze Firenze Italy Institute of Physics Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne Switzerland INFN Sezione 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 Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany Aix Marseille Univ CNRS/IN2P3 CPPM Marseille France Institute for High Energy Physics (IHEP) Protvino Russia Syracuse University Syracuse United States Yandex School of Data Analysis Moscow Russia Physik-Institut Universität Zürich Zürich Switzerland Department of Physics University of Warwick Coventry United Kingdom Laboratoire Leprince-Ringuet Palaiseau France National University of Science and Technology “MISIS” Moscow Russia National Center

The B + and B − labels of the confidence regions in figure 10 of the original paper [1] were erroneously swapped. The corrected figure is shown in figure 10.

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Erratum to: Measurement of CP observables in B± → DK*± decays using two- and four-body D final states

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Journal of High Energy Physics 2018年第5期2018卷 1-7页

作者： Aaij, R. Adeva, B. Adinolfi, M. Ajaltouni, Z. Akar, S. Albrecht, J. Alessio, F. Alexander, M. Alfonso Albero, A. Ali, S. Alkhazov, G. Alvarez Cartelle, P. Alves, A. A. Amato, S. Amerio, S. Amhis, Y. An, L. Anderlini, L. Andreassi, G. Andreotti, M. Andrews, J. E. Appleby, R. B. Archilli, F. d’Argent, P. Arnau Romeu, J. Artamonov, A. Artuso, M. Aslanides, E. Atzeni, M. Auriemma, G. Baalouch, M. Babuschkin, I. Bachmann, S. Back, J. J. Badalov, A. Baesso, C. Baker, S. Balagura, V. Baldini, W. Baranov, A. Barlow, R. J. Barschel, C. Barsuk, S. Barter, W. Baryshnikov, F. Batozskaya, V. Battista, V. Bay, A. Beaucourt, L. Beddow, J. Bedeschi, F. Bediaga, I. Beiter, A. Bel, L. J. Beliy, N. Bellee, V. Belloli, N. Belous, K. Belyaev, I. Ben-Haim, E. Bencivenni, G. Benson, S. Beranek, S. Berezhnoy, A. Bernet, R. Berninghoff, D. Bertholet, E. Bertolin, A. Betancourt, C. Betti, F. Bettler, M.-O. van Beuzekom, M. Bezshyiko, Ia. Bifani, S. Billoir, P. Birnkraut, A. Bizzeti, A. Bjørn, M. Blake, T. Blanc, F. Blusk, S. Bocci, V. Boettcher, T. Bondar, A. Bondar, N. Bordyuzhin, I. Borgheresi, A. Borghi, S. Borisyak, M. Borsato, M. Bossu, F. Boubdir, M. Bowcock, T. J. V. Bowen, E. Bozzi, C. Braun, S. Britton, T. Brodzicka, J. Brundu, D. Buchanan, E. Burr, C. Bursche, A. Buytaert, J. Byczynski, W. Cadeddu, S. Cai, H. Calabrese, R. Calladine, R. Calvi, M. Calvo Gomez, M. Camboni, A. Campana, P. Campora Perez, D. H. Capriotti, L. Carbone, A. Carboni, G. Cardinale, R. Cardini, A. Carniti, P. Carson, L. Carvalho Akiba, K. Casse, G. Cassina, L. Cattaneo, M. Cavallero, G. Cenci, R. Chamont, D. Chapman, M. G. Charles, M. Charpentier, Ph. Chatzikonstantinidis, G. Chefdeville, M. Chen, S. Cheung, S. F. Chitic, S.-G. Chobanova, V. Chrzaszcz, M. Chubykin, A. Ciambrone, P. Cid Vidal, X. Ciezarek, G. Clarke, P. E. L. Clemencic, M. Cliff, H. V. Closier, J. Cogan, J. Cogneras, E. Cogoni, V. Cojocariu, L. Collins, P. Colombo, T. Comerma-Montells, A. Contu, A. Cook, A. Coombs, G. Coquereau, S. Corti, G. Corvo, M. Costa Sobral, C. M. Couturier, B. Cowan, 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 University of Cincinnati Cincinnati United States Fakultät Physik Technische Universität Dortmund Dortmund Germany School of Physics and Astronomy University of Glasgow Glasgow United Kingdom ICCUB Universitat de Barcelona Barcelona Spain Nikhef National Institute for Subatomic Physics Amsterdam The Netherlands Petersburg Nuclear Physics Institute (PNPI) Gatchina Russia Imperial College London London United Kingdom 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 Institute of Physics Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne Switzerland Universita e INFN 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 Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany Aix Marseille Univ CNRS/IN2P3 CPPM Marseille France Institute for High Energy Physics (IHEP) Protvino Russia Syracuse University Syracuse United States Physik-Institut Universität Zürich Zürich Switzerland Sezione INFN di Roma La Sapienza Roma Italy Department of Physics University of Warwick Coventry United Kingdom LIFAELS La Salle Universitat Ramon Llull Barcelona Spain Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio) Rio de Janeiro Brazil Laboratoire Leprince-Ringuet Palaiseau France Yandex School of Data Analysis Moscow Russia Institute of Theoretical and Experimental Physics (ITEP) Moscow

The measurements of Aππ and RKK in B± → DK*± decays were incorrectly reported in the paper [1], due to a transposition of the systematic uncertainties. This error was present in the reporting of the indiv...

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A software reliability prediction based on RBM algorithm improvement method

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International Journal of Electrical engineering 2016年第3期23卷 105-112页

作者： Yang, Chunhui Chen, Songli Dai, Qingyun Liu, Yihong Chen, Dingfang Software Quality Engineering Research Center College of Computer Science and Technology Wuhan University of Technology China Information Engineering College Guangdong University of Technology China Software Quality Engineering Research Center China Electronic Product Reliability and Environmental Testing Research Institute China College of Computer Science and Technology Wuhan University of Technology China

College of computer science and technology, wuhan university of technology;Software Quality engineering research Center, China Electronic Product Reliability and Environmental Testing research institute, China Songli Chen, Although the classic DBN has a good capability of feature extraction layer by layer and plays an important role in the area of software reliability prediction, training data still costs more time, and test error rate is relatively large. Therefore, the algorithm and network structure of DBN still has room for improvement. In this paper, the algorithms and architectures of DBN model is improved by determining the input dimension combined with self-organizing algorithm, automatically adjusting the number of hidden units and adding the support vector machine (SVM) classifier with the model output. In this way, it will not only substantially reduce the amount of information loss in each layer and the time of training data, but also improving the prediction accuracy of software reliability prediction. In order to verify the superiority of the improved software reliability prediction model, we have compared the traditional DBN software reliability prediction model with the improved one by experiment in this paper.

关键词： Software reliability

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Measurement of the Ωc0 Baryon Lifetime

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Physical Review Letters 2018年第9期121卷 092003-092003页

作者： R. Aaij B. Adeva M. Adinolfi C. A. Aidala Z. Ajaltouni S. Akar P. Albicocco J. Albrecht F. Alessio M. Alexander A. Alfonso Albero 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 K. Arzymatov E. Aslanides M. Atzeni B. Audurier S. Bachmann J. J. Back S. Baker V. Balagura W. Baldini A. Baranov R. J. Barlow S. Barsuk W. Barter F. Baryshnikov V. Batozskaya B. Batsukh V. Battista A. Bay J. Beddow F. Bedeschi I. Bediaga A. Beiter L. J. Bel S. Belin N. Beliy V. Bellee N. Belloli K. Belous I. Belyaev E. Ben-Haim G. Bencivenni S. Benson S. Beranek A. Berezhnoy R. Bernet D. Berninghoff E. Bertholet A. Bertolin C. Betancourt F. Betti M. O. Bettler M. van Beuzekom Ia. Bezshyiko S. Bhasin J. Bhom S. Bifani P. Billoir A. Birnkraut A. Bizzeti M. Bjørn M. P. Blago T. Blake F. Blanc S. Blusk D. Bobulska V. Bocci O. Boente Garcia T. Boettcher A. Bondar N. Bondar S. Borghi M. Borisyak M. Borsato F. Bossu M. Boubdir T. J. V. Bowcock C. Bozzi S. Braun M. Brodski J. Brodzicka A. Brossa Gonzalo D. Brundu E. Buchanan A. Buonaura C. Burr A. Bursche J. Buytaert W. Byczynski S. Cadeddu H. Cai R. Calabrese R. Calladine M. Calvi M. Calvo Gomez A. Camboni P. Campana 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 M. Cattaneo G. Cavallero R. Cenci D. Chamont M. G. Chapman M. Charles Ph. Charpentier G. Chatzikonstantinidis M. Chefdeville V. Chekalina C. Chen S. Chen S.-G. Chitic V. Chobanova M. Chrzaszcz A. Chubykin P. Ciambrone X. Cid Vidal G. Ciezarek P. E. L. Clarke M. Clemencic H. V. Cliff J. Closier V. Coco J. A. B. Coelho J. Cogan E. Cogneras L. Cojocariu P. Collins T. Colombo A. Comerma-Montells A. Contu G. Coombs S. Coquereau G. Corti M. Corvo C. M. Costa Sobral B. Couturier G. A. Cowan D. C. Craik A. Crocombe M. Cruz Torres R. Currie C. D’Ambrosio F. Da Cunha Marinho C. L. Da Silva Nikhef National Institute for Subatomic Physics Amsterdam Netherlands Instituto Galego de Física de Altas Enerxías (IGFAE) Universidade de Santiago de Compostela Santiago de Compostela Spain H.H. Wills Physics Laboratory University of Bristol Bristol United Kingdom University of Michigan Ann Arbor USA (associated with Syracuse University Syracuse New York USA) Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France University of Cincinnati Cincinnati Ohio USA INFN Laboratori Nazionali di Frascati Frascati Italy Fakultät Physik Technische Universität Dortmund Dortmund Germany European Organization for Nuclear Research (CERN) Geneva Switzerland School of Physics and Astronomy University of Glasgow Glasgow United Kingdom ICCUB Universitat de Barcelona Barcelona Spain Petersburg Nuclear Physics Institute (PNPI) Gatchina Russia Imperial College London London United Kingdom Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil INFN Sezione di Padova Padova Italy LAL Univ. Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay France Center for High Energy Physics Tsinghua University Beijing China INFN Sezione di Firenze Firenze Italy Institute of Physics Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne Switzerland INFN Sezione 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 Aix Marseille Univ CNRS/IN2P3 CPPM Marseille France Institute for High Energy Physics (IHEP) Protvino Russia Syracuse University Syracuse New York USA Yandex School of Data Analysis Moscow Russia Physik-Institut Universität Zürich Zürich Switzerland INFN Sezione di Cagliari Monserrato Italy Department of Physics University of Warwick Coventry United Kingdom National University of Science and Technology “MISIS” Moscow Russia (associa

We report a measurement of the lifetime of the Ωc0 baryon using proton-proton collision data at center-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3.0 fb−1 collected by the LHCb experiment. The sample consists of about 1000 Ωb−→Ωc0μ−ν¯μX signal decays, where the Ωc0 baryon is detected in the pK−K−π+ final state and X represents possible additional undetected particles in the decay. The Ωc0 lifetime is measured to be τΩc0=268±24±10±2 fs, where the uncertainties are statistical, systematic, and from the uncertainty in the D+ lifetime, respectively. This value is nearly four times larger than, and inconsistent with, the current world-average value.

关键词： Heavy baryons

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Evidence for the Rare Decay Σ+→pμ+μ−

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Physical Review Letters 2018年第22期120卷 221803-221803页

作者： R. Aaij B. Adeva M. Adinolfi Z. Ajaltouni S. Akar J. Albrecht F. Alessio M. Alexander A. Alfonso Albero 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 M. Atzeni G. Auriemma M. Baalouch I. Babuschkin S. Bachmann J. J. Back A. Badalov C. Baesso S. Baker V. Balagura W. Baldini A. Baranov R. J. Barlow C. Barschel S. Barsuk W. Barter F. Baryshnikov V. Batozskaya V. Battista A. Bay L. Beaucourt J. Beddow F. Bedeschi I. Bediaga A. Beiter L. J. Bel N. Beliy V. Bellee N. Belloli K. Belous I. Belyaev E. Ben-Haim G. Bencivenni S. Benson S. Beranek A. Berezhnoy R. Bernet D. Berninghoff E. Bertholet A. Bertolin C. Betancourt F. Betti M. O. Bettler M. van Beuzekom Ia. Bezshyiko S. Bifani P. Billoir A. Birnkraut A. Bizzeti M. Bjørn T. Blake F. Blanc S. Blusk V. Bocci T. Boettcher A. Bondar N. Bondar I. Bordyuzhin S. Borghi M. Borisyak M. Borsato F. Bossu M. Boubdir T. J. V. Bowcock E. Bowen C. Bozzi S. Braun J. Brodzicka D. Brundu E. Buchanan C. Burr A. Bursche J. Buytaert W. Byczynski S. Cadeddu H. Cai R. Calabrese R. Calladine M. Calvi M. Calvo Gomez A. Camboni P. Campana 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 M. Cattaneo G. Cavallero R. Cenci D. Chamont M. G. Chapman M. Charles Ph. Charpentier G. Chatzikonstantinidis M. Chefdeville S. Chen S. F. Cheung S.-G. Chitic V. Chobanova M. Chrzaszcz A. Chubykin P. Ciambrone 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 T. Colombo A. Comerma-Montells A. Contu G. Coombs S. Coquereau G. Corti M. Corvo C. M. Costa Sobral B. Couturier G. A. Cowan D. C. Craik A. Crocombe M. Cruz Torres R. Currie C. D’Ambrosio F. Da Cunha Marinho C. L. Da Silva E. Dall’Occo J. Dalseno A. Davis O. De Aguiar Francisco K. De Bruyn S. De Ca European Organization for Nuclear Research (CERN) Geneva Switzerland Instituto Galego de Física de Altas Enerxías (IGFAE) Universidade 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 University of Cincinnati Cincinnati Ohio USA Fakultät Physik Technische Universität Dortmund Dortmund Germany School of Physics and Astronomy University of Glasgow Glasgow United Kingdom ICCUB Universitat de Barcelona Barcelona Spain Nikhef National Institute for Subatomic Physics Amsterdam Netherlands Petersburg Nuclear Physics Institute (PNPI) Gatchina Russia Imperial College London London United Kingdom Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil Sezione INFN di Padova Padova Italy LAL Univ. Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay France Center for High Energy Physics Tsinghua University Beijing China Sezione INFN di Firenze Firenze Italy Institute of Physics Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne Switzerland Universita e INFN 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 Aix Marseille Univ CNRS/IN2P3 CPPM Marseille France Institute for High Energy Physics (IHEP) Protvino Russia Syracuse University Syracuse New York USA Physik-Institut Universität Zürich Zürich Switzerland Sezione INFN di Roma La Sapienza Roma Italy Department of Physics University of Warwick Coventry United Kingdom Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio) Rio de Janeiro Brazil (associated with Institution Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil) Yandex School of Data Analysis Moscow Russia Institute of Theoretical and Experimental Phy

A search for the rare decay Σ+→pμ+μ− is performed using pp collision data recorded by the LHCb experiment at center-of-mass energies s=7 and 8 TeV, corresponding to an integrated luminosity of 3 fb−1. An excess of events is observed with respect to the background expectation, with a signal significance of 4.1 standard deviations. No significant structure is observed in the dimuon invariant mass distribution, in contrast with a previous result from the HyperCP experiment. The measured Σ+→pμ+μ− branching fraction is (2.2−1.3+1.8)×10−8, where statistical and systematic uncertainties are included, which is consistent with the standard model prediction.

关键词： Electroweak interaction Rare decays Baryons Hypothetical scalars Hadron colliders

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