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Search for the Higgs Boson Decaying to Two Muons in Proton-Proton Collisions at s=13 TeV

Physical Review Letters 2019年第2期122卷 021801-021801页

作者： A. M. Sirunyan A. Tumasyan W. Adam F. Ambrogi E. Asilar T. Bergauer J. Brandstetter E. Brondolin M. Dragicevic J. Erö A. Escalante Del Valle M. Flechl R. Frühwirth V. M. Ghete J. Hrubec M. Jeitler N. Krammer I. Krätschmer D. Liko T. Madlener I. Mikulec N. Rad H. Rohringer J. Schieck R. Schöfbeck M. Spanring D. Spitzbart A. Taurok W. Waltenberger J. Wittmann C.-E. Wulz M. Zarucki V. Chekhovsky V. Mossolov J. Suarez Gonzalez E. A. De Wolf D. Di Croce X. Janssen J. Lauwers M. Pieters M. Van De Klundert H. Van Haevermaet P. Van Mechelen N. Van Remortel S. Abu Zeid F. Blekman J. D’Hondt I. De Bruyn J. De Clercq K. Deroover G. Flouris D. Lontkovskyi S. Lowette I. Marchesini S. Moortgat L. Moreels Q. Python K. Skovpen S. Tavernier W. Van Doninck P. Van Mulders I. Van Parijs D. Beghin B. Bilin H. Brun B. Clerbaux G. De Lentdecker H. Delannoy B. Dorney G. Fasanella L. Favart R. Goldouzian A. Grebenyuk A. K. Kalsi T. Lenzi J. Luetic E. Starling C. Vander Velde P. Vanlaer D. Vannerom T. Cornelis D. Dobur A. Fagot M. Gul I. Khvastunov D. Poyraz C. Roskas D. Trocino M. Tytgat W. Verbeke B. Vermassen M. Vit N. Zaganidis H. Bakhshiansohi O. Bondu S. Brochet G. Bruno C. Caputo P. David C. Delaere M. Delcourt B. Francois A. Giammanco G. Krintiras V. Lemaitre A. Magitteri A. Mertens M. Musich K. Piotrzkowski A. Saggio M. Vidal Marono S. Wertz J. Zobec F. L. Alves G. A. Alves L. Brito G. Correia Silva C. Hensel A. Moraes M. E. Pol P. Rebello Teles E. Belchior Batista Das Chagas W. Carvalho J. Chinellato E. Coelho E. M. Da Costa G. G. Da Silveira D. De Jesus Damiao C. De Oliveira Martins S. Fonseca De Souza H. Malbouisson D. Matos Figueiredo M. Melo De Almeida C. Mora Herrera L. Mundim H. Nogima W. L. Prado Da Silva L. J. Sanchez Rosas A. Santoro A. Sznajder M. Thiel E. J. Tonelli Manganote F. Torres Da Silva De Araujo A. Vilela Pereira S. Ahuja C. A. Bernardes L. Calligaris T. R. Fernandez Perez Tomei E. M. Gregores P. G. Mercadante S. F. Novaes Sandra S. Padula D. Romero Abad A. Aleksandrov R. Hadjiiska P. Iaydjiev A. Marinov M. M Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Wien Austria Institute for Nuclear Problems Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Universidade Estadual Paulista São Paulo Brazil Universidade Federal do ABC São Paulo Brazil Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences Sofia Bulgaria University of Sofia Sofia Bulgaria Beihang University Beijing China National Centre for Physics Quaid-I-Azam University Islamabad Pakistan Institute of High Energy Physics Beijing China CERN European Organization for Nuclear Research Geneva Switzerland Texas Tech University Lubbock Texas USA State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China University of Virginia Charlottesville Virginia USA Universidad de Los Andes Bogota Colombia University of Split Faculty of Electrical Engineering Mechanical Engineering and Naval Architecture Split Croatia University of Split Faculty of Science Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Charles University Prague Czech Republic Escuela Politecnica Nacional Quito Ecuador Universidad San Francisco de Quito Quito Ecuador Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo Egypt The University of Kansas Lawrence Kansas USA National Institute of Chemical Physics and Biophysics Tallinn Estonia Department of Physics University of Helsinki Helsinki Finland Helsinki Institute of Physics Helsinki Finland Lappeenranta University of Technology Lappeenranta Finland IRFU CEA Université Paris-Saclay Gif-s

A search for the Higgs boson decaying to two oppositely charged muons is presented using data recorded by the CMS experiment at the CERN LHC in 2016 at a center-of-mass energy s=13 TeV, corresponding to an integrated luminosity of 35.9 fb−1. data are found to be compatible with the predicted background. For a Higgs boson with a mass of 125.09 GeV, the 95% confidence level observed (background-only expected) upper limit on the production cross section times the branching fraction to a pair of muons is found to be 3.0 (2.5) times the standard model expectation. In combination with data recorded at center-of-mass energies s=7 and 8 TeV, the background-only expected upper limit improves to 2.2 times the standard model value with a standard model expected significance of 1.0 standard deviation. The corresponding observed upper limit is 2.9 with an observed significance of 0.9 standard deviation. This corresponds to an observed upper limit on the standard model Higgs boson branching fraction to muons of 6.4×10−4 and to an observed signal strength of 1.0±1.0(stat)±0.1(syst).

关键词： Leptonic, semileptonic & radiative decays Higgs bosons Muons Hadron colliders

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Search for Narrow Hγ Resonances in Proton-Proton Collisions at s=13 TeV

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Physical Review Letters 2019年第8期122卷 081804-081804页

作者： A. M. Sirunyan A. Tumasyan W. Adam F. Ambrogi E. Asilar T. Bergauer J. Brandstetter M. Dragicevic J. Erö A. Escalante Del Valle M. Flechl R. Frühwirth V. M. Ghete J. Hrubec M. Jeitler N. Krammer I. Krätschmer D. Liko T. Madlener I. Mikulec N. Rad H. Rohringer J. Schieck R. Schöfbeck M. Spanring D. Spitzbart A. Taurok W. Waltenberger J. Wittmann C.-E. Wulz M. Zarucki V. Chekhovsky V. Mossolov J. Suarez Gonzalez E. A. De Wolf D. Di Croce X. Janssen J. Lauwers M. Pieters H. Van Haevermaet P. Van Mechelen N. Van Remortel S. Abu Zeid F. Blekman J. D’Hondt I. De Bruyn J. De Clercq K. Deroover G. Flouris D. Lontkovskyi S. Lowette I. Marchesini S. Moortgat L. Moreels Q. Python K. Skovpen S. Tavernier W. Van Doninck P. Van Mulders I. Van Parijs D. Beghin B. Bilin H. Brun B. Clerbaux G. De Lentdecker H. Delannoy B. Dorney G. Fasanella L. Favart R. Goldouzian A. Grebenyuk A. K. Kalsi T. Lenzi J. Luetic N. Postiau E. Starling L. Thomas C. Vander Velde P. Vanlaer D. Vannerom Q. Wang T. Cornelis D. Dobur A. Fagot M. Gul I. Khvastunov D. Poyraz C. Roskas D. Trocino M. Tytgat W. Verbeke B. Vermassen M. Vit N. Zaganidis H. Bakhshiansohi O. Bondu S. Brochet G. Bruno C. Caputo P. David C. Delaere M. Delcourt A. Giammanco G. Krintiras V. Lemaitre A. Magitteri A. Mertens M. Musich K. Piotrzkowski A. Saggio M. Vidal Marono S. Wertz J. Zobec F. L. Alves G. A. Alves M. Correa Martins Junior G. Correia Silva C. Hensel A. Moraes M. E. Pol P. Rebello Teles E. Belchior Batista Das Chagas W. Carvalho J. Chinellato E. Coelho E. M. Da Costa G. G. Da Silveira D. De Jesus Damiao C. De Oliveira Martins S. Fonseca De Souza H. Malbouisson D. Matos Figueiredo M. Melo De Almeida C. Mora Herrera L. Mundim H. Nogima W. L. Prado Da Silva L. J. Sanchez Rosas A. Santoro A. Sznajder M. Thiel E. J. Tonelli Manganote F. Torres Da Silva De Araujo A. Vilela Pereira S. Ahuja C. A. Bernardes L. Calligaris T. R. Fernandez Perez Tomei E. M. Gregores P. G. Mercadante S. F. Novaes Sandra S. Padula A. Aleksandrov R. Hadjiiska P. Iaydjiev A. Marinov M. Misheva M. Rodo Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Wien Austria Institute for Nuclear Problems Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium The University of Kansas Lawrence Kansas USA Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Universidade Estadual Paulista São Paulo Brazil Universidade Federal do ABC São Paulo Brazil Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences Sofia Bulgaria University of Sofia Sofia Bulgaria Beihang University Beijing China National Centre for Physics Quaid-I-Azam University Islamabad Pakistan Institute of High Energy Physics Beijing China CERN European Organization for Nuclear Research Geneva Switzerland Texas Tech University Lubbock Texas USA State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China University of Virginia Charlottesville Virginia USA Universidad de Los Andes Bogota Colombia University of Split Faculty of Electrical Engineering Mechanical Engineering and Naval Architecture Split Croatia University of Split Faculty of Science Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Charles University Prague Czech Republic Escuela Politecnica Nacional Quito Ecuador Universidad San Francisco de Quito Quito Ecuador Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo Egypt National Institute of Chemical Physics and Biophysics Tallinn Estonia Department of Physics University of Helsinki Helsinki Finland Helsinki Institute of Physics Helsinki Finland Lappeenranta University of Technology Lappeenranta Finland IRFU CEA Université Paris-Saclay Gif-s

A search for heavy, narrow resonances decaying to a Higgs boson and a photon (Hγ) has been performed in proton-proton collision data at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb−1 collected with the CMS detector at the LHC in 2016. Events containing a photon and a Lorentz-boosted hadronically decaying Higgs boson reconstructed as a single, large-radius jet are considered, and the γ+jet invariant mass spectrum is analyzed for the presence of narrow resonances. To increase the sensitivity of the search, events are categorized depending on whether or not the large-radius jet can be identified as a result of the merging of two jets originating from b quarks. Results in both categories are found to agree with the predictions of the standard model. Upper limits on the production rate of Hγ resonances are set as a function of their mass in the range of 720–3250 GeV, representing the most stringent constraints to date.

关键词： Extensions of gauge sector Particle production Higgs bosons Hypothetical gauge bosons Photons Hadron colliders

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An energy-efficient bandwidth allocation method for single-chip heterogeneous processor 7

An energy-efficient bandwidth allocation method for single-c...

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7th International Green and Sustainable computing Conference, IGSC 2016

作者： Zhu, Yatao Zhang, Shuai Ye, Xiaochun Wang, Da Tan, Xu Fan, Dongrui Zhang, Zhimin Li, Hongliang State Key Laboratory of Computer Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing China School of Computer and Control Engineering University of Chinese Academy of Sciences Beijing China National Computer Network Emergency Response Technical Team/Coordination Center of China Beijing China State Key Laboratory of Mathematical Engineering and Advanced Computing Wuxi Jiangsu China

ISBN: (纸本)9781509051175

In recent years, many studies on optimization of energy consumption have focused on heterogeneous processor architectures. Heterogeneous computing model composed of CPU and GPU has developed from co-processing between the chips to CPU and GPU integration on the same die. On the one hand, because GPU can work under low voltage and ultra-low frequency, heterogeneous multi-core processors exhibit better energy efficiency compared to traditional CPU;On the other hand, because GPU usually has little or no shared cache, its memory bandwidth demand will be several times more than that of CPU for the same performance. Considering the constraints of power consumption and memory bandwidth, the contention problems of power and bandwidth among CPU and GPU in heterogeneous processor will inevitably occur. In this paper, energy-efficient bandwidth allocation method for heterogeneous processors allocates bandwidth to CPU and GPU and increases the overall throughput of CPU and GPU. Meanwhile the efficiency of energy consumption of heterogeneous processors is improved. The queuing delay is introduced to build a performance-energy model for heterogeneous processors. According to experience parameters, we analyze how the memory bandwidth allocation of off-chip affects the total throughput and energy efficiency. This paper also explores the change of performance-energy gains with the cache miss ratio of processors and the degree of scarce of available peak bandwidth. Based on the above research, the analytical solution of energy-efficient bandwidth allocation for optimal performance is obtained, and the solution can get more performance-energy gains compared with natural bandwidth allocation. © 2016 IEEE.

关键词： Bandwidth

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Classification of Handwriting Number Based on PCANet network with data Augmentation

Classification of Handwriting Number Based on PCANet Network...

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2016 2nd International Conference on Advances in Mechanical Engineering and Industrial Informatics(AMEII 2016)

作者： Tianmei Guo Jiwen Dong Lei Wang Department of Computer Science and Technology Shandong Provincial Key Laboratory of Network based Intelligent Computing University of Jinan

ISBN: (纸本)9781510823808

In this paper we proposed an algorithm for classification of handwriting number which use depth of the structure of the simple convolution neural network-- PCANet network with data *** network with data augmentation consists of four parts,one is data augmentation,two is the basic PCA filters,part three is binary quantization,four is the block-wise *** simple convolution neural network improve some defects of classic convolution neural network such as training time too long,need special tuning parameters and technique *** allows for training networks with many features,making them insensitive to variability between class and *** of experimental results show that the PCANet network with data augmentation algorithms have higher recognition rate than the classification effect with that of SVM algorithm,BP neural network and PCANet.

关键词： handwriting number recognition Deep learning PCANet network data augmentation

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Performance analysis of parallel replica molecular dynamics

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AIP Conference Proceedings 2018年第1期1978卷

作者： Boyao Zhang Jue Wang Yangde Feng Ji Xiang Lei Wang 1Computer Network Information Center Chinese Academy of Science Department of High Performance Computing Technology and Application Development Beijing China 2University of Chinese Academy of Sciences Beijing China 3State Key Laboratory of Information Security Institute of Information Engineering Chinese Academy of Sciences China 4School of cybersecurity Chinese Academy of Sciences China

Molecular dynamics simulation is an important tool for studying materials microstructure evolution under radiation effects. It is difficult to simulate atomic diffusion in materials owing to the time-scale limitations of the molecular dynamics method. Accelerated molecular dynamics has been developed as a solution and the parallel replica method is the simplest and most accurate of the accelerated dynamics techniques. The simulation time scale can reach several orders more than the direct molecular dynamics, while retaining the complete atomic detail. In parallel replica method, the entire system is replicated on each of M available parallel or distributed processors, it is in line with the characteristics of high-performance parallel computing and can be optimized from the program level.

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An interval-based Bayesian generative model for human complex activity recognition

arXiv

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arXiv 2017年

作者： Liu, Li Yang, Yongzhong Govindarajan, Lakshmi N. Wang, Shu Hu, Bin Cheng, Li Rosenblum, David S. Ministry of Education Key Laboratory of Dependable Service Computing in Cyber Physical Society Chongqing400044 China School of Software Engineering Chongqing University Chongqing400044 China School of Computing National University of Singapore 117417 Singapore Bioinformatics Institute A*STAR 138671 Singapore College of Material Science and Engineering Lanzhou University of Technology Lanzhou730050 China School of Information Science and Engineering Lanzhou University 730000 China

Complex activity recognition is challenging due to the inherent uncertainty and diversity of performing a complex activity. Normally, each instance of a complex activity has its own configuration of atomic actions and their temporal dependencies. We propose in this paper an atomic action-based Bayesian model that constructs Allen's interval relation networks to characterize complex activities with structural varieties in a probabilistic generative way: By introducing latent variables from the Chinese restaurant process, our approach is able to capture all possible styles of a particular complex activity as a unique set of distributions over atomic actions and relations. We also show that local temporal dependencies can be retained and are globally consistent in the resulting interval network. Moreover, network structure can be learned from empirical data. A new dataset of complex hand activities has been constructed and made publicly available, which is much larger in size than any existing datasets. Empirical evaluations on benchmark datasets as well as our in-house dataset demonstrate the competitiveness of our approach. Copyright © 2017, The Authors. All rights reserved.

关键词： Bayesian networks

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Automatic mobile retinal microaneurysm detection using handheld fundus camera via cloud computing

Automatic mobile retinal microaneurysm detection using handh...

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Imaging and Multimedia Analytics in a Web and Mobile World 2016

作者： You, Jane Li, Qin Guo, Zhenhua Department of Computing Hong Kong Polytechnic University Kowloon Hong Kong Shenzhen Institute of Information Technology School of Software Engineering Shenzhen China Shenzhen Key Laboratory of Broaband Network and Multimedia Graduate School at Shenzhen Tsinghua University China

This paper presents a new system to monitor retinal microaneurysm which are regarded as the first sign of diabetic retinopathy(DR). The proposed approach to automatic microaneurysm detection aims to enhance screening large populations. Most of the existing computer-Aided systems for microaneurysm detection are based on the sophisticated medical device in a clinical environment. However, the popular medical devices such as table fundus camera and portable fundus camera are subject to certain limitations for its usage beyond the scope of clinical practice. The challenges include the complexity of operation, cost issue and requirement of professional maintenance, etc. Unlike the conventional approaches, we developed an automatic mobile retinal microaneurysm detection system by using a handheld fundus camera to facilitate retinal healthcare and monitoring with flexibility and convenience. Our system includes: (1) retinal image capturing by handheld fundus camera;(2) retinal image analysis via cloud computing;(3) microaneurysm detection by Multi-orientation Sum of Matched Filter and SVM. The experimental results demonstrate the feasibility of our system by performance improvement on the aspects of speed, accuracy, and convenience. © 2016 Society for Imaging science and technology.

关键词： Cloud computing

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Combination of Searches for Higgs Boson Pair Production in Proton-Proton Collisions at s=13 TeV

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Physical Review Letters 2019年第12期122卷 121803-121803页

作者： A. M. Sirunyan A. Tumasyan W. Adam F. Ambrogi E. Asilar T. Bergauer J. Brandstetter M. Dragicevic J. Erö A. Escalante Del Valle M. Flechl R. Frühwirth V. M. Ghete J. Hrubec M. Jeitler N. Krammer I. Krätschmer D. Liko T. Madlener I. Mikulec N. Rad H. Rohringer J. Schieck R. Schöfbeck M. Spanring D. Spitzbart A. Taurok W. Waltenberger J. Wittmann C.-E. Wulz M. Zarucki V. Chekhovsky V. Mossolov J. Suarez Gonzalez E. A. De Wolf D. Di Croce X. Janssen J. Lauwers M. Pieters H. Van Haevermaet P. Van Mechelen N. Van Remortel S. Abu Zeid F. Blekman J. D’Hondt J. De Clercq K. Deroover G. Flouris D. Lontkovskyi S. Lowette I. Marchesini S. Moortgat L. Moreels Q. Python K. Skovpen S. Tavernier W. Van Doninck P. Van Mulders I. Van Parijs D. Beghin B. Bilin H. Brun B. Clerbaux G. De Lentdecker H. Delannoy B. Dorney G. Fasanella L. Favart R. Goldouzian A. Grebenyuk A. K. Kalsi T. Lenzi J. Luetic N. Postiau E. Starling L. Thomas C. Vander Velde P. Vanlaer D. Vannerom Q. Wang T. Cornelis D. Dobur A. Fagot M. Gul I. Khvastunov D. Poyraz C. Roskas D. Trocino M. Tytgat W. Verbeke B. Vermassen M. Vit N. Zaganidis H. Bakhshiansohi O. Bondu S. Brochet G. Bruno C. Caputo P. David C. Delaere M. Delcourt A. Giammanco G. Krintiras V. Lemaitre A. Magitteri K. Piotrzkowski A. Saggio M. Vidal Marono S. Wertz J. Zobec F. L. Alves G. A. Alves M. Correa Martins Junior G. Correia Silva C. Hensel A. Moraes M. E. Pol P. Rebello Teles E. Belchior Batista Das Chagas W. Carvalho J. Chinellato E. Coelho E. M. Da Costa G. G. Da Silveira D. De Jesus Damiao C. De Oliveira Martins S. Fonseca De Souza H. Malbouisson D. Matos Figueiredo M. Melo De Almeida C. Mora Herrera L. Mundim H. Nogima W. L. Prado Da Silva L. J. Sanchez Rosas A. Santoro A. Sznajder M. Thiel E. J. Tonelli Manganote F. Torres Da Silva De Araujo A. Vilela Pereira S. Ahuja C. A. Bernardes L. Calligaris T. R. Fernandez Perez Tomei E. M. Gregores P. G. Mercadante S. F. Novaes Sandra S. Padula A. Aleksandrov R. Hadjiiska P. Iaydjiev A. Marinov M. Misheva M. Rodozov M. Shopova G. Sultanov A. Dim Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Wien Austria Institute for Nuclear Problems Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium The University of Kansas Lawrence Kansas USA Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Universidade Estadual Paulista São Paulo Brazil Universidade Federal do ABC São Paulo Brazil Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences Sofia Bulgaria University of Sofia Sofia Bulgaria Beihang University Beijing China National Centre for Physics Quaid-I-Azam University Islamabad Pakistan Institute of High Energy Physics Beijing China CERN European Organization for Nuclear Research Geneva Switzerland Texas Tech University Lubbock Texas USA State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China University of Virginia Charlottesville Virginia USA Universidad de Los Andes Bogota Colombia University of Split Faculty of Electrical Engineering Mechanical Engineering and Naval Architecture Split Croatia University of Split Faculty of Science Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Charles University Prague Czech Republic Escuela Politecnica Nacional Quito Ecuador Universidad San Francisco de Quito Quito Ecuador Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo Egypt National Institute of Chemical Physics and Biophysics Tallinn Estonia Department of Physics University of Helsinki Helsinki Finland Helsinki Institute of Physics Helsinki Finland Lappeenranta University of Technology Lappeenranta Finland IRFU CEA Université Paris-Saclay Gif-s

This Letter describes a search for Higgs boson pair production using the combined results from four final states: bbγγ, bbττ, bbbb, and bbVV, where V represents a W or Z boson. The search is performed using data collected in 2016 by the CMS experiment from LHC proton-proton collisions at s=13 TeV, corresponding to an integrated luminosity of 35.9 fb−1. Limits are set on the Higgs boson pair production cross section. A 95% confidence level observed (expected) upper limit on the nonresonant production cross section is set at 22.2 (12.8) times the standard model value. A search for narrow resonances decaying to Higgs boson pairs is also performed in the mass range 250–3000 GeV. No evidence for a signal is observed, and upper limits are set on the resonance production cross section.

关键词： Higgs bosons Hypothetical scalars Hadron colliders

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Search for W Boson Decays to Three Charged Pions

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Physical Review Letters 2019年第15期122卷 151802-151802页

作者： A. M. Sirunyan A. Tumasyan W. Adam F. Ambrogi E. Asilar T. Bergauer J. Brandstetter M. Dragicevic J. Erö A. Escalante Del Valle M. Flechl R. Frühwirth V. M. Ghete J. Hrubec M. Jeitler N. Krammer I. Krätschmer D. Liko T. Madlener I. Mikulec N. Rad H. Rohringer J. Schieck R. Schöfbeck M. Spanring D. Spitzbart W. Waltenberger J. Wittmann C.-E. Wulz M. Zarucki V. Chekhovsky V. Mossolov J. Suarez Gonzalez E. A. De Wolf D. Di Croce X. Janssen J. Lauwers A. Lelek M. Pieters H. Van Haevermaet P. Van Mechelen N. Van Remortel F. Blekman J. D’Hondt J. De Clercq K. Deroover G. Flouris D. Lontkovskyi S. Lowette I. Marchesini S. Moortgat L. Moreels Q. Python K. Skovpen S. Tavernier W. Van Doninck P. Van Mulders I. Van Parijs D. Beghin B. Bilin H. Brun B. Clerbaux G. De Lentdecker H. Delannoy B. Dorney G. Fasanella L. Favart A. Grebenyuk A. K. Kalsi J. Luetic A. Popov N. Postiau E. Starling L. Thomas C. Vander Velde P. Vanlaer D. Vannerom Q. Wang T. Cornelis D. Dobur A. Fagot M. Gul I. Khvastunov C. Roskas D. Trocino M. Tytgat W. Verbeke B. Vermassen M. Vit N. Zaganidis O. Bondu G. Bruno C. Caputo P. David C. Delaere M. Delcourt A. Giammanco G. Krintiras V. Lemaitre A. Magitteri K. Piotrzkowski A. Saggio M. Vidal Marono P. Vischia J. Zobec F. L. Alves G. A. Alves G. Correia Silva C. Hensel A. Moraes M. E. Pol P. Rebello Teles E. Belchior Batista Das Chagas W. Carvalho J. Chinellato E. Coelho E. M. Da Costa G. G. Da Silveira D. De Jesus Damiao C. De Oliveira Martins S. Fonseca De Souza L. M. Huertas Guativa H. Malbouisson D. Matos Figueiredo M. Melo De Almeida C. Mora Herrera L. Mundim H. Nogima W. L. Prado Da Silva L. J. Sanchez Rosas A. Santoro A. Sznajder M. Thiel E. J. Tonelli Manganote F. Torres Da Silva De Araujo A. Vilela Pereira S. Ahuja C. A. Bernardes L. Calligaris T. R. Fernandez Perez Tomei E. M. Gregores P. G. Mercadante S. F. Novaes Sandra S. Padula A. Aleksandrov R. Hadjiiska P. Iaydjiev A. Marinov M. Misheva M. Rodozov M. Shopova G. Sultanov A. Dimitrov L. Litov B. Pavlov P. Petkov W. Fang X. Gao L. Yuan M. Ahmad Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Wien Austria Institute for Nuclear Problems Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium The University of Kansas Lawrence Kansas USA Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Universidade Estadual Paulista São Paulo Brazil Universidade Federal do ABC São Paulo Brazil Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences Sofia Bulgaria University of Sofia Sofia Bulgaria Beihang University Beijing China National Centre for Physics Quaid-I-Azam University Islamabad Pakistan Institute of High Energy Physics Beijing China CERN European Organization for Nuclear Research Geneva Switzerland State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China University of Virginia Charlottesville Virginia USA Universidad de Los Andes Bogota Colombia Universidad de Antioquia Medellin Colombia University of Split Faculty of Electrical Engineering Mechanical Engineering and Naval Architecture Split Croatia University of Split Faculty of Science Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Charles University Prague Czech Republic Escuela Politecnica Nacional Quito Ecuador Universidad San Francisco de Quito Quito Ecuador Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo Egypt National Institute of Chemical Physics and Biophysics Tallinn Estonia Department of Physics University of Helsinki Helsinki Finland Helsinki Institute of Physics Helsinki Finland Lappeenranta University of Technology Lappeenranta Finland IRFU CEA Université Paris-Saclay Gif

For the first time, a search for the rare decay of the W boson to three charged pions has been performed. Proton-proton collision data recorded by the CMS experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 77.3 fb−1, have been analyzed. No significant excess is observed above the background expectation. An upper limit of 1.01×10−6 is set at 95% confidence level on the branching fraction of the W boson to three charged pions. This provides a strong motivation for theoretical calculations of this branching fraction.

关键词： Particle decays W & Z bosons Hadron colliders

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Jet Shapes of Isolated Photon-Tagged Jets in Pb-Pb and pp Collisions at sNN=5.02 TeV

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Physical Review Letters 2019年第15期122卷 152001-152001页

The modification of jet shapes in Pb-Pb collisions, relative to those in pp collisions, is studied for jets associated with an isolated photon. The data were collected with the CMS detector at the LHC at a nucleon-nucleon center-of-mass energy of 5.02 TeV. Jet shapes are constructed from charged particles with track transverse momenta (pT) above 1 GeV/c in annuli around the axes of jets with pTjet>30 GeV/c associated with an isolated photon with pTγ>60 GeV/c. The jet shape distributions are consistent between peripheral Pb-Pb and pp collisions, but are modified for more central Pb-Pb collisions. In these central Pb-Pb events, a larger fraction of the jet momentum is observed at larger distances from the jet axis compared to pp, reflecting the interaction between the partonic medium created in heavy ion collisions and the traversing partons.

关键词： Quark & gluon jets Relativistic heavy-ion collisions Hadron colliders

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