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Precision Measurement of the Longitudinal Double-Spin Asymmetry for Inclusive Jet Production in Polarized Proton Collisions at s=200 GeV

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Physical Review Letters 2015年第9期115卷 092002-092002页

作者： L. Adamczyk J. K. Adkins G. Agakishiev M. M. Aggarwal Z. Ahammed I. Alekseev J. Alford C. D. Anson A. Aparin D. Arkhipkin E. C. Aschenauer G. S. Averichev A. Banerjee D. R. Beavis R. Bellwied A. Bhasin A. K. Bhati P. Bhattarai H. Bichsel J. Bielcik J. Bielcikova L. C. Bland I. G. Bordyuzhin W. Borowski J. Bouchet A. V. Brandin S. G. Brovko S. Bültmann I. Bunzarov T. P. Burton J. Butterworth H. Caines M. Calderón de la Barca Sánchez J. M. Campbell D. Cebra R. Cendejas M. C. Cervantes P. Chaloupka Z. Chang S. Chattopadhyay H. F. Chen J. H. Chen L. Chen J. Cheng M. Cherney A. Chikanian W. Christie J. Chwastowski M. J. M. Codrington G. Contin J. G. Cramer H. J. Crawford A. B. Cudd X. Cui S. Das A. Davila Leyva L. C. De Silva R. R. Debbe T. G. Dedovich J. Deng A. A. Derevschikov R. Derradi de Souza S. Dhamija B. di Ruzza L. Didenko C. Dilks F. Ding P. Djawotho X. Dong J. L. Drachenberg J. E. Draper C. M. Du L. E. Dunkelberger J. C. Dunlop L. G. Efimov J. Engelage K. S. Engle G. Eppley L. Eun O. Evdokimov O. Eyser R. Fatemi S. Fazio J. Fedorisin P. Filip E. Finch Y. Fisyak C. E. Flores C. A. Gagliardi D. R. Gangadharan D. Garand F. Geurts A. Gibson M. Girard S. Gliske L. Greiner D. Grosnick D. S. Gunarathne Y. Guo A. Gupta S. Gupta W. Guryn B. Haag A. Hamed L.-X. Han R. Haque J. W. Harris S. Heppelmann A. Hirsch G. W. Hoffmann D. J. Hofman S. Horvat B. Huang H. Z. Huang X. Huang P. Huck T. J. Humanic G. Igo W. W. Jacobs H. Jang E. G. Judd S. Kabana D. Kalinkin K. Kang K. Kauder H. W. Ke D. Keane A. Kechechyan A. Kesich Z. H. Khan D. P. Kikola I. Kisel A. Kisiel D. D. Koetke T. Kollegger J. Konzer I. Koralt L. K. Kosarzewski L. Kotchenda A. F. Kraishan P. Kravtsov K. Krueger I. Kulakov L. Kumar R. A. Kycia M. A. C. Lamont J. M. Landgraf K. D. Landry J. Lauret A. Lebedev R. Lednicky J. H. Lee M. J. LeVine C. Li W. Li X. Li Y. Li Z. M. Li M. A. Lisa F. Liu T. Ljubicic W. J. Llope M. Lomnitz R. S. Longacre X. Luo G. L. Ma Y. G. Ma D. M. M. D. Madagodagettige Don D. P. Mahapatra R. Majka S. Margetis C. Markert H. Masui H. S AGH University of Science and Technology Cracow 30-059 Poland University of Kentucky Lexington Kentucky 40506-0055 USA Joint Institute for Nuclear Research Dubna 141 980 Russia Panjab University Chandigarh 160014 India Variable Energy Cyclotron Centre Kolkata 700064 India Alikhanov Institute for Theoretical and Experimental Physics Moscow 117218 Russia Kent State University Kent Ohio 44242 USA Ohio State University Columbus Ohio 43210 USA Brookhaven National Laboratory Upton New York 11973 USA University of Houston Houston Texas 77204 USA University of Jammu Jammu 180001 India University of Texas Austin Texas 78712 USA University of Washington Seattle Washington 98195 USA Czech Technical University in Prague FNSPE Prague 115 19 Czech Republic Nuclear Physics Institute AS CR 250 68 Řež/Prague Czech Republic SUBATECH Nantes France Moscow Engineering Physics Institute Moscow 115409 Russia University of California Davis California 95616 USA Old Dominion University Norfolk Virginia 23529 USA Rice University Houston Texas 77251 USA Yale University New Haven Connecticut 06520 USA Pennsylvania State University University Park Pennsylvania 16802 USA Texas A&M University College Station Texas 77843 USA University of Science and Technology of China Hefei 230026 China Shanghai Institute of Applied Physics Shanghai 201800 China Central China Normal University (HZNU) Wuhan 430079 China Tsinghua University Beijing 100084 China Creighton University Omaha Nebraska 68178 USA Cracow University of Technology Cracow 31-342 Poland Lawrence Berkeley National Laboratory Berkeley California 94720 USA University of California Berkeley California 94720 USA Institute of Physics Bhubaneswar 751005 India Shandong University Jinan Shandong 250100 China Institute of High Energy Physics Protvino 142281 Russia Universidade Estadual de Campinas Sao Paulo 05314-970 Brazil Indiana University Bloomington Indiana 47408 USA Valparaiso University Valparaiso Indi

We report a new measurement of the midrapidity inclusive jet longitudinal double-spin asymmetry, ALL, in polarized pp collisions at center-of-mass energy s=200 GeV. The STAR data place stringent constraints on polarized parton distribution functions extracted at next-to-leading order from global analyses of inclusive deep-inelastic scattering (DIS), semi-inclusive DIS, and RHIC pp data. The measured asymmetries provide evidence at the 3σ level for positive gluon polarization in the Bjorken-x region x>0.05.

关键词： QCD phase transitions Quark-gluon plasma

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Study of working depth in port ground under heavy vehicle load

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Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and engineering 2014年第SUPPL.1期33卷 2942-2949页

作者： Zhang, Jun Shen, Junmin Gan, Tian Yuan, Jingbo Key Laboratory of Highway Construction and Maintenance Technology in Loess Region Shanxi Transportation Research Institute Taiyuan Shanxi 030006 China School of Civil Engineering and Mechanics Huazhong University of Science and Technology Wuhan Hubei 430074 China CCCC Forth Harbor Engineering Investigation and Design Institute Co. Ltd. Guangzhou Guangdong 510230 China

A three-dimensional numerical simulation was conducted by FLAC3D software to simulate the field test. A model calibration was conducted to ensure that the numerical modeling was a realistic representation by the measured data. Finally, a sensitivity analysis was performed to investigate influence factors, such as the thickness of sand cushion, area of thrust surface and wheel pressure. The research results indicated that: (1) Under the vehicle load, when the ratio of additional stress to gravity stress was equal to 0.2 and 0.1, the corresponding depths were 1.63 and 2.03 m, respectively. (2) The maximum vertical strain occurred at the top of the mucky clay. (3) The lateral displacement increased first and then decreased along the depth and horizontal direction. (4) With the increase of thickness of sand cushion, the maximum vertical strain and the largest lateral displacement of the ground increased firstly and decreased lastly. (5) When the thickness of medium-coarse sand was about 1.25 m, the working depth was right at the bottom of medium-coarse sand. (6) The working depth, the maximum vertical strain and the maximum lateral displacement of ground increased with the increase of the area of thrust surface and wheel pressure.

关键词： Sensitivity analysis

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research on road information extraction from high resolution imagery based on global precedence

Research on road information extraction from high resolution...

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International Workshop on Earth Observation and Remote Sensing Applications (EORSA)

作者： Hao Chen Lili Yin Li Ma National-Local Joint Engineering Laboratory of Geo-Spatial Information Technology Hunan university of science and technology xiangtan hunan china Changjiang Institute of Survey Planning Design and Research wuhan hubei china

Semi-automatic/automatic road extraction from remote sensing imagery is one of the hot topics in the field of remote sensing, surveying and mapping and computer vision, etc. Traditional methods based on Marr's Computation Theory of Vision follow the pattern of local-to-global features extraction. However, in high resolution image, the local features such as road boundary and road width are easily affected by noise and make the traditional extraction process based on edge extraction and template matching more difficult. At the same time, it is inconsistent with the human cognitive process during the visual interpretation. For all of the above reasons, the paper develop a new road extraction method according with human cognitive process. It is a kind of top-down road extraction strategy based on global precedence in the background of GIS data updating. The proposed methodology consists of four parts: 1) extract road priori topological information from the now available GIS data; 2) extract road morphological skeleton; 3) built the global features of road in the image space using automatic approximation conflation between road vector and road skeleton; 4) extract the local features in the high resolution images under the constraints of global features. The global topological approximation method based on Network Snakes algorithm is the focus in the paper. With the experiment on IKONOS image of Weihai city, the method was confirmed to be able to produce acceptable road global characteristics and local features (such as centerlines).

关键词： Roads Feature extraction Skeleton Vectors Approximation methods Image edge detection data mining

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Current-aware scheduling for flash storage devices

Current-aware scheduling for flash storage devices

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IEEE International Conference on Embedded and Real-Time Computing Systems and Applications (RTCSA)

作者： Tzu-Jung Huang Chien-Chung Ho Po-Chun Huang Yuan-Hao Chang Che-Wei Chang Tei-Wei Kuo Department of Computer Science and Information Engineering National Taiwan University Taipei Taiwan R.O.C. Department of Computer Science and Engineering & Innovation Center for Big Data and Digital Convergence Yuan Ze University Taoyuan Taiwan R.O.C. Academia Sinica Institute of Information Science Taipei Taiwan R.O.C. Department of Computer Science and Information Engineering Chang Gung University Taoyuan Taiwan R.O.C. Academia Sinica Research Center for Information Technology Innovation Taipei Taiwan R.O.C.

ISBN: (纸本)9781479939541

As NAND flash memory has become a major choice of storage media in diversified computing environments, the performance issue of flash memory has been extensively addressed in many excellent designs. Among them, an effective strategy is to adopt multiple channels and flash-memory chips to improve the performance on data accesses. However, the degree of data access parallelism cannot be increased by simply increasing the number of channels and chips in the storage device, because it is seriously limited by the maximum current constraint of the bus interface and affected by the access patterns of user data. As a consequence, to maximize the degree of access parallelism, it is of paramount significance to have a proper scheduling strategy to determine the order that read/write requests are served. In this paper, a current-aware scheduling strategy for read/write requests is proposed to maximize the read performance without violating the bus current constraint and without missing (the deadline of) written data. The proposed strategy is then evaluated through a series of experiments, in which the results are quite encouraging.

关键词： Production Random access memory

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Measurement of electrons from semileptonic heavy-flavor hadron decays in pp collisions at s=2.76 TeV

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Physical Review D 2015年第1期91卷 012001-012001页

作者： B. Abelev J. Adam D. Adamová M. M. Aggarwal M. Agnello A. Agostinelli N. Agrawal Z. Ahammed N. Ahmad I. Ahmed S. U. Ahn S. A. Ahn I. Aimo S. Aiola M. Ajaz A. Akindinov S. N. Alam D. Aleksandrov B. Alessandro D. Alexandre A. Alici A. Alkin J. Alme T. Alt S. Altinpinar I. Altsybeev C. Alves Garcia Prado C. Andrei A. Andronic V. Anguelov J. Anielski T. Antičić F. Antinori P. Antonioli L. Aphecetche H. Appelshäuser N. Arbor S. Arcelli N. Armesto R. Arnaldi T. Aronsson I. C. Arsene M. Arslandok A. Augustinus R. Averbeck T. C. Awes M. D. Azmi M. Bach A. Badalà Y. W. Baek S. Bagnasco R. Bailhache R. Bala A. Baldisseri F. Baltasar Dos Santos Pedrosa R. C. Baral R. Barbera F. Barile G. G. Barnaföldi L. S. Barnby V. Barret J. Bartke M. Basile N. Bastid S. Basu B. Bathen G. Batigne B. Batyunya P. C. Batzing C. Baumann I. G. Bearden H. Beck C. Bedda N. K. Behera I. Belikov F. Bellini R. Bellwied E. Belmont-Moreno R. Belmont, III V. Belyaev G. Bencedi S. Beole I. Berceanu A. Bercuci Y. Berdnikov D. Berenyi M. E. Berger R. A. Bertens D. Berzano L. Betev A. Bhasin I. R. Bhat A. K. Bhati B. Bhattacharjee J. Bhom L. Bianchi N. Bianchi C. Bianchin J. Bielčík J. Bielčíková A. Bilandzic S. Bjelogrlic F. Blanco D. Blau C. Blume F. Bock A. Bogdanov H. Bøggild M. Bogolyubsky F. V. Böhmer L. Boldizsár M. Bombara J. Book H. Borel A. Borissov F. Bossú M. Botje E. Botta S. Böttger P. Braun-Munzinger M. Bregant T. Breitner T. A. Broker T. A. Browning M. Broz E. Bruna G. E. Bruno D. Budnikov H. Buesching S. Bufalino P. Buncic O. Busch Z. Buthelezi D. Caffarri X. Cai H. Caines L. Calero Diaz A. Caliva E. Calvo Villar P. Camerini F. Carena W. Carena J. Castillo Castellanos E. A. R. Casula V. Catanescu C. Cavicchioli C. Ceballos Sanchez J. Cepila P. Cerello B. Chang S. Chapeland J. L. Charvet S. Chattopadhyay V. Chelnokov M. Cherney C. Cheshkov B. Cheynis V. Chibante Barroso D. D. Chinellato P. Chochula M. Chojnacki S. Choudhury P. Christakoglou C. H. Christensen P. Christiansen T. Chujo S. U. Chung C. Cicalo L. Cifarelli F. Cindolo J. Cleymans Lawrence Livermore National Laboratory Livermore California USA Faculty of Nuclear Sciences and Physical Engineering Czech Technical University in Prague Prague Czech Republic Nuclear Physics Institute Academy of Sciences of the Czech Republic Řežu Prahy Czech Republic Physics Department Panjab University Chandigarh India Sezione INFN Turin Italy Politecnico di Torino Turin Italy Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN Bologna Italy Indian Institute of Technology Bombay (IIT) Mumbai India Variable Energy Cyclotron Centre Kolkata India Department of Physics Aligarh Muslim University Aligarh India COMSATS Institute of Information Technology (CIIT) Islamabad Pakistan Korea Institute of Science and Technology Information Daejeon South Korea Yale University New Haven Connecticut USA Institute for Theoretical and Experimental Physics Moscow Russia Russian Research Centre Kurchatov Institute Moscow Russia School of Physics and Astronomy University of Birmingham Birmingham United Kingdom Centro Fermi - Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi” Rome Italy Sezione INFN Bologna Italy Bogolyubov Institute for Theoretical Physics Kiev Ukraine Faculty of Engineering Bergen University College Bergen Norway Frankfurt Institute for Advanced Studies Johann Wolfgang Goethe-Universität Frankfurt Frankfurt Germany Department of Physics and Technology University of Bergen Bergen Norway V. Fock Institute for Physics St. Petersburg State University St. Petersburg Russia Universidade de São Paulo (USP) São Paulo Brazil National Institute for Physics and Nuclear Engineering Bucharest Romania Research Division and ExtreMe Matter Institute EMMI GSI Helmholtzzentrum für Schwerionenforschung Darmstadt Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany Institut für Kernphysik Westfälische Wilhelms-Universität Münster Münster Germany Rudjer Bošković Institute Zagreb Croatia Sezione

The pT-differential production cross section of electrons from semileptonic decays of heavy-flavor hadrons has been measured at midrapidity in proton-proton collisions at s=2.76 TeV in the transverse momentum range 0... 详细信息

关键词： PROTON-proton interactions HADRONS -- Decay CROSS sections (Nuclear physics) LARGE Hadron Collider (France & Switzerland) PERTURBATIVE quantum chromodynamics

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Centrality dependence of particle production in p−Pb collisions at sNN=5.02TeV

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Physical Review C 2015年第6期91卷 064905-064905页

作者： J. Adam D. Adamová M. M. Aggarwal G. Aglieri Rinella M. Agnello A. Agostinelli N. Agrawal Z. Ahammed I. Ahmed S. U. Ahn I. Aimo S. Aiola M. Ajaz A. Akindinov S. N. Alam D. Aleksandrov B. Alessandro D. Alexandre R. Alfaro Molina A. Alici A. Alkin J. Alme T. Alt S. Altinpinar I. Altsybeev C. Alves Garcia Prado C. Andrei A. Andronic V. Anguelov J. Anielski T. Antičić F. Antinori P. Antonioli L. Aphecetche H. Appelshäuser S. Arcelli N. Armesto R. Arnaldi T. Aronsson I. C. Arsene M. Arslandok A. Augustinus R. Averbeck M. D. Azmi M. Bach A. Badalà Y. W. Baek S. Bagnasco R. Bailhache R. Bala A. Baldisseri M. Ball F. Baltasar Dos Santos Pedrosa R. C. Baral A. M. Barbano R. Barbera F. Barile G. G. Barnaföldi L. S. Barnby V. Barret P. Bartalini J. Bartke E. Bartsch M. Basile N. Bastid S. Basu B. Bathen G. Batigne A. Batista Camejo B. Batyunya P. C. Batzing I. G. Bearden H. Beck C. Bedda N. K. Behera I. Belikov F. Bellini H. Bello Martinez R. Bellwied R. Belmont E. Belmont-Moreno V. Belyaev G. Bencedi S. Beole I. Berceanu A. Bercuci Y. Berdnikov D. Berenyi R. A. Bertens D. Berzano L. Betev A. Bhasin I. R. Bhat A. K. Bhati B. Bhattacharjee J. Bhom L. Bianchi N. Bianchi C. Bianchin J. Bielčík J. Bielčíková A. Bilandzic S. Biswas S. Bjelogrlic F. Blanco D. Blau C. Blume F. Bock A. Bogdanov H. Bøggild L. Boldizsár M. Bombara J. Book H. Borel A. Borissov M. Borri F. Bossú M. Botje E. Botta S. Böttger P. Braun-Munzinger M. Bregant T. Breitner T. A. Broker T. A. Browning M. Broz E. Bruna G. E. Bruno D. Budnikov H. Buesching S. Bufalino P. Buncic O. Busch Z. Buthelezi J. T. Buxton D. Caffarri X. Cai H. Caines L. Calero Diaz A. Caliva E. Calvo Villar P. Camerini F. Carena W. Carena J. Castillo Castellanos A. J. Castro E. A. R. Casula V. Catanescu C. Cavicchioli C. Ceballos Sanchez J. Cepila P. Cerello B. Chang S. Chapeland M. Chartier J. L. Charvet S. Chattopadhyay V. Chelnokov M. Cherney C. Cheshkov B. Cheynis V. Chibante Barroso D. D. Chinellato P. Chochula K. Choi M. Chojnacki S. Choudhury P. Christakoglou C. H. Christensen P. Ch Faculty of Nuclear Sciences and Physical Engineering Czech Technical University in Prague Prague Czech Republic Nuclear Physics Institute Academy of Sciences of the Czech Republic Řež u Prahy Czech Republic Physics Department Panjab University Chandigarh India European Organization for Nuclear Research (CERN) Geneva Switzerland Sezione INFN Turin Italy Politecnico di Torino Turin Italy Dipartimento di Fisica e Astronomia dell'Università and Sezione INFN Bologna Italy Indian Institute of Technology Bombay (IIT) Mumbai India Variable Energy Cyclotron Centre Kolkata India COMSATS Institute of Information Technology (CIIT) Islamabad Pakistan Korea Institute of Science and Technology Information Daejeon South Korea Yale University New Haven Connecticut USA Institute for Theoretical and Experimental Physics Moscow Russia Russian Research Centre Kurchatov Institute Moscow Russia School of Physics and Astronomy University of Birmingham Birmingham United Kingdom Instituto de Física Universidad Nacional Autónoma de México Mexico City Mexico Centro Fermi–Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi ” Rome Italy Sezione INFN Bologna Italy Bogolyubov Institute for Theoretical Physics Kiev Ukraine Faculty of Engineering Bergen University College Bergen Norway Frankfurt Institute for Advanced Studies Johann Wolfgang Goethe-Universität Frankfurt Frankfurt Germany Department of Physics and Technology University of Bergen Bergen Norway V. Fock Institute for Physics St. Petersburg State University St. Petersburg Russia Universidade de São Paulo (USP) São Paulo Brazil National Institute for Physics and Nuclear Engineering Bucharest Romania Research Division and ExtreMe Matter Institute EMMI GSI Helmholtzzentrum für Schwerionenforschung Darmstadt Germany Physikalisches Institut Ruprecht–Karls-Universität Heidelberg Heidelberg Germany Institut für Kernphysik Westfälische Wilhelms-Universität Münster Münster Germany Rudjer Bošković Institute Zagr

We report measurements of the primary charged-particle pseudorapidity density and transverse momentum distributions in p−Pb collisions at sNN=5.02TeV and investigate their correlation with experimental observables sensitive to the centrality of the collision. Centrality classes are defined by using different event-activity estimators, i.e., charged-particle multiplicities measured in three different pseudorapidity regions as well as the energy measured at beam rapidity (zero degree). The procedures to determine the centrality, quantified by the number of participants (Npart) or the number of nucleon-nucleon binary collisions (Ncoll) are described. We show that, in contrast to Pb-Pb collisions, in p−Pb collisions large multiplicity fluctuations together with the small range of participants available generate a dynamical bias in centrality classes based on particle multiplicity. We propose to use the zero-degree energy, which we expect not to introduce a dynamical bias, as an alternative event-centrality estimator. Based on zero-degree energy-centrality classes, the Npart dependence of particle production is studied. Under the assumption that the multiplicity measured in the Pb-going rapidity region scales with the number of Pb participants, an approximate independence of the multiplicity per participating nucleon measured at mid-rapidity of the number of participating nucleons is observed. Furthermore, at high-pT the p−Pb spectra are found to be consistent with the pp spectra scaled by Ncoll for all centrality classes. Our results represent valuable input for the study of the event-activity dependence of hard probes in p−Pb collisions and, hence, help to establish baselines for the interpretation of the Pb-Pb data.

关键词： LEAD isotopes HEAVY ion collisions NUCLEON-nucleon interactions PARTICLES (Nuclear physics) -- Multiplicity ANGULAR momentum (Nuclear physics) INELASTIC cross sections

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Measurement of the Ratio of Branching Fractions B(B¯0→D*+τ−ν¯τ)/B(B¯0→D*+μ−ν¯μ)

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Physical Review Letters 2015年第11期115卷 111803-111803页

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

The branching fraction ratio R(D*)≡B(B¯0→D*+τ−ν¯τ)/B(B¯0→D*+μ−ν¯μ) is measured using a sample of proton-proton collision data corresponding to 3.0 fb−1 of integrated luminosity recorded by the LHCb experiment during 2011 and 2012. The tau lepton is identified in the decay mode τ−→μ−ν¯μντ. The semitauonic decay is sensitive to contributions from non-standard-model particles that preferentially couple to the third generation of fermions, in particular, Higgs-like charged scalars. A multidimensional fit to kinematic distributions of the candidate B¯0 decays gives R(D*)=0.336±0.027(stat)±0.030(syst). This result, which is the first measurement of this quantity at a hadron collider, is 2.1 standard deviations larger than the value expected from lepton universality in the standard model.

关键词： BRANCHING ratios (Nuclear physics) STATISTICAL reliability HADRON colliders FERMIONS LEPTON interactions

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Search for Hidden-Sector Bosons in B0→K*0μ+μ− Decays

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Physical Review Letters 2015年第16期115卷 161802-161802页

作者： R. Aaij B. Adeva M. Adinolfi A. Affolder Z. Ajaltouni S. Akar J. Albrecht F. Alessio M. Alexander S. Ali G. Alkhazov P. Alvarez Cartelle A. A. Alves, Jr S. Amato S. Amerio Y. Amhis L. An L. Anderlini J. Anderson G. Andreassi M. Andreotti J. E. Andrews R. B. Appleby O. Aquines Gutierrez F. Archilli P. d’Argent A. Artamonov M. Artuso E. Aslanides G. Auriemma M. Baalouch S. Bachmann J. J. Back A. Badalov C. Baesso W. Baldini R. J. Barlow C. Barschel S. Barsuk W. Barter V. Batozskaya V. Battista A. Bay L. Beaucourt J. Beddow F. Bedeschi I. Bediaga L. J. Bel V. Bellee N. Belloli I. Belyaev E. Ben-Haim G. Bencivenni S. Benson J. Benton A. Berezhnoy R. Bernet A. Bertolin M.-O. Bettler M. van Beuzekom A. Bien S. Bifani P. Billoir T. Bird A. Birnkraut A. Bizzeti T. Blake F. Blanc J. Blouw S. Blusk V. Bocci A. Bondar N. Bondar W. Bonivento S. Borghi M. Borsato T. J. V. Bowcock E. Bowen C. Bozzi S. Braun M. Britsch T. Britton J. Brodzicka N. H. Brook E. Buchanan A. Bursche J. Buytaert S. Cadeddu R. Calabrese M. Calvi M. Calvo Gomez P. Campana D. Campora Perez L. Capriotti A. Carbone G. Carboni R. Cardinale A. Cardini P. Carniti L. Carson K. Carvalho Akiba G. Casse L. Cassina L. Castillo Garcia M. Cattaneo Ch. Cauet G. Cavallero R. Cenci M. Charles Ph. Charpentier M. Chefdeville S. Chen S.-F. Cheung N. Chiapolini M. Chrzaszcz X. Cid Vidal G. Ciezarek P. E. L. Clarke M. Clemencic H. V. Cliff J. Closier V. Coco J. Cogan E. Cogneras V. Cogoni L. Cojocariu G. Collazuol P. Collins A. Comerma-Montells A. Contu A. Cook M. Coombes S. Coquereau G. Corti M. Corvo B. Couturier G. A. Cowan D. C. Craik A. Crocombe M. Cruz Torres S. Cunliffe R. Currie C. D’Ambrosio E. Dall’Occo J. Dalseno P. N. Y. David A. Davis K. De Bruyn S. De Capua M. De Cian J. M. De Miranda L. De Paula P. De Simone C.-T. Dean D. Decamp M. Deckenhoff L. Del Buono N. Déléage M. Demmer D. Derkach O. Deschamps F. Dettori B. Dey A. Di Canto F. Di Ruscio H. Dijkstra S. Donleavy F. Dordei M. Dorigo A. Dosil Suárez D. Dossett A. Dovbnya K. Dreimanis L. Dufour G. Dujany F. D 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 Oliver Lodge Laboratory University of Liverpool Liverpool United Kingdom Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Fakultät Physik Technische Universität Dortmund Dortmund Germany School of Physics and Astronomy University of Glasgow Glasgow United Kingdom Nikhef National Institute for Subatomic Physics Amsterdam The Netherlands Petersburg Nuclear Physics Institute (PNPI) Gatchina Russia Imperial College London London United Kingdom University of Cincinnati Cincinnati Ohio 45221 USA Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil Sezione INFN di Padova Padova Italy LAL Université Paris-Sud CNRS/IN2P3 Orsay France Center for High Energy Physics Tsinghua University Beijing China Sezione INFN di Firenze Firenze Italy Physik-Institut Universität Zürich Zürich Switzerland Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne Switzerland Sezione INFN di Ferrara Ferrara Italy University of Maryland College Park Maryland 20742 USA School of Physics and Astronomy University of Manchester Manchester United Kingdom Max-Planck-Institut für Kernphysik (MPIK) Heidelberg Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany Institute for High Energy Physics (IHEP) Protvino Russia Syracuse University Syracuse New York 13244 USA Sezione INFN di Roma La Sapienza Roma Italy Department of Physics University of Warwick Coventry United Kingdom Universitat de Barcelona Barcelona Spain Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio) Rio de Janeiro Brazil (associated with Institution Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil) National Center for Nuclear Rese

A search is presented for hidden-sector bosons, χ, produced in the decay B0→K*(892)0χ, with K*(892)0→K+π− and χ→μ+μ−. The search is performed using pp-collision data corresponding to 3.0 fb−1 collected with the LHCb detector. No significant signal is observed in the accessible mass range 214≤m(χ)≤4350 MeV, and upper limits are placed on the branching fraction product B(B0→K*(892)0χ)×B(χ→μ+μ−) as a function of the mass and lifetime of the χ boson. These limits are of the order of 10−9 for χ lifetimes less than 100 ps over most of the m(χ) range, and place the most stringent constraints to date on many theories that predict the existence of additional low-mass bosons.

关键词： Leptonic, semileptonic & radiative decays Particle production Bottom mesons Hypothetical scalars Hadron colliders

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Evidence for the Strangeness-Changing Weak Decay Ξb−→Λb0π−

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Physical Review Letters 2015年第24期115卷 241801-241801页

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

Using a pp collision data sample corresponding to an integrated luminosity of 3.0 fb−1, collected by the LHCb detector, we present the first search for the strangeness-changing weak decay Ξb−→Λb0π−. No b hadron decay of this type has been seen before. A signal for this decay, corresponding to a significance of 3.2 standard deviations, is reported. The relative rate is measured to be fΞb−fΛb0B(Ξb−→Λb0π−)=(5.7±1.8−0.9+0.8)×10−4,where fΞb− and fΛb0 are the b→Ξb− and b→Λb0 fragmentation fractions, and B(Ξb−→Λb0π−) is the branching fraction. Assuming fΞb−/fΛb0 is bounded between 0.1 and 0.3, the branching fraction B(Ξb−→Λb0π−) would lie in the range from (0.57±0.21)% to (0.19±0.07)%.

关键词： HEAVY quark effective theory BRANCHING ratios (Nuclear physics) LARGE Hadron Collider (France & Switzerland) HADRONS -- Decay CENTER of mass

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Measurement of CP Violation in B0→J/ψKS0 Decays

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Physical Review Letters 2015年第3期115卷 031601-031601页

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

Measurements are presented of the CP violation observables S and C in the decays of B0 and B¯0 mesons to the J/ψKS0 final state. The data sample corresponds to an integrated luminosity of 3.0 fb−1 collected with the LHCb experiment in proton-proton collisions at center-of-mass energies of 7 and 8 TeV, and contains a total of 41 560 selected B0 and B¯0 decays. The analysis of the time evolution of these decays yields S=0.731±0.035(stat)±0.020(syst) and C=−0.038±0.032(stat)±0.005(syst). In the standard model, S equals sin(2β) to a good level of precision. The values are consistent with the current world averages and with the standard model expectations.

关键词： CP violation (Nuclear physics) PARTICLE decays MESONS PROTON-proton interactions THEORETICAL particle physics

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