2,113 research outputs found

    Estrategias didácticas en la resolución de problemas matemáticos, en equipo, en el tema de operaciones con expresiones algebraicas en una variable, en 8vo grado del Colegio Rubén Darío, del Municipio de la Conquista, departamento de Carazo, durante el I semestre del Año 2015

    Get PDF
    El presente trabajo de investigación tiene como objetivo fomentar las Estrategias didácticas utilizadas por los docentes en la exploración de conocimientos previos y la resolución de problemas matemáticos en equipos, en el tema de operaciones con expresiones algebraicas en una variable en 8vo grado del Colegio Rubén Darío, del Municipio de la Conquista, del departamento de Carazo durante el I semestre del Año 2015. La particularidad de esta investigación, permitió incidir en la problemática que presentan los niños y niñas en la exploración delcurriculum que poseen antes situaciones problemáticas de su entorno al interactuar con sus compañerosen el tema de operaciones con expresiones algebraicas. Para esto se introdujeronexperiencias innovadoras (Modelo epistemológico, Modelo de Poyla, y la contextualización de situaciones problemáticos) que permitieron mejorar la calidad de la enseñanza. Es un estudio que permite describir la metodología de la enseñanza y la aplicación de diferentes estrategias didácticas para abordar el tema de operaciones con expresiones algebraicas Para obtener información se aplicaron diferentes instrumentos como: guía de entrevista al docente de segundo grado, guía de observación directa al aula de clase de segundo grado, se aplicó encuestas, para ver el avance en la problemática que presentan los niños y niñas, analizar las experiencia en la exploración de temas en equipo que tenían los y las alumnos del 8vo grado del Colegio Rubén Darío, del Municipio de la Conquista, del departamento de Carazo, durante el I semestre del Año 2015

    Constructing a unifying theory of dynamic programming DCOP algorithms via the generalized distributive law

    Get PDF
    In this paper we propose a novel message-passing algorithm, the so-called Action-GDL, as an extension to the generalized distributive law (GDL) to ef¿ciently solve DCOPs. Action-GDL provides a unifying perspective of several dynamic programming DCOP algorithms that are based on GDL, such as DPOP and DCPOP algorithms. We empirically show how Action-GDL using a novel distributed post-processing heuristic can outperform DCPOP, and by extension DPOP, even when the latter uses the best arrangement provided by multiple state-of-the-art heuristics.Work funded by IEA (TIN2006-15662-C02-01), AT (CONSOLIDER CSD2007-0022, INGENIO 2010) and EVE (TIN2009-14702-C02-01 and 02). Vinyals is supported by the Spanish Ministry of Education (FPU grant AP2006-04636)Peer Reviewe

    Auctions and bidding: A guide for computer scientists

    Get PDF
    There is a veritable menagerie of auctions-single-dimensional, multi-dimensional, single-sided, double-sided, first-price, second-price, English, Dutch, Japanese, sealed-bid-and these have been extensively discussed and analyzed in the economics literature. The main purpose of this article is to survey this literature from a computer science perspective, primarily from the viewpoint of computer scientists who are interested in learning about auction theory, and to provide pointers into the economics literature for those who want a deeper technical understanding. In addition, since auctions are an increasingly important topic in computer science, we also look at work on auctions from the computer science literature. Overall, our aim is to identifying what both these bodies of work these tell us about creating electronic auctions. © 2011 ACM.This work was funded in part by HP under the “Always on” grant, by NSF IIS-0329037 “Tools and Techniques for Automated Mechanism Design”, and by IEA (TIN2006-15662-C02-01), OK (IST-4-027253-STP), eREP(EC-FP6-CIT5-28575) and Agreement Technologies (CONSOLIDER CSD2007-0022, INGENIO 2010).Peer Reviewe

    A Survey on Sensor Networks from a Multiagent Perspective

    Get PDF
    Sensor networks (SNs) have arisen as one of the most promising technologies for the next decades. The recent emergence of small and inexpensive sensors based upon microelectromechanical systems ease the development and proliferation of this kind of networks in a wide range of actual-world applications. Multiagent systems (MAS) have been identified as one of the most suitable technologies to contribute to the deployment of SNs that exhibit flexibility, robustness and autonomy. The purpose of this survey is 2-fold. On the one hand, we review the most relevant contributions of agent technologies to this emerging application domain. On the other hand, we identify the challenges that researchers must address to establish MAS as the key enabling technology for SNs.This work has been funded by projects IEA(TIN2006-15662-C02-01), Agreement Technologies (CONSOLIDER CSD2007-0022, INGENIO 2010), EVE (TIN2009-14702-C02-01,TIN2009-14702-C02-02) and Generalitat de Catalunya under the gran t2009-SGR-1434. Meritxell Vinyals is supported by the Spanish Ministry of Education (FPU grant AP2006-04636)Peer Reviewe

    Efecto de la aplicación de ALGASOIL ® sobre el rendimiento y valor nutricional del kikuyo (Pennisetum clandestinum Hoechst. Ex Chiov.) en Palmira, Zarcero, Alajuela, Costa Rica

    Get PDF
    Trabajo Final de Graduación (Licenciatura en Ingeniería en Agronomía). Instituto Tecnológico de Costa Rica, Escuela de Agronomía, 2017.Aguilar, R. 2017. Effects of the application of Algasoil® on the efficacy and nutritional value of the kikuyo (Pennisetum clandestinum Hoechst Ex Chiov.) In Palmira, Zarcero, Alajuela, Costa Rica. The present work was conducted with the objective of evaluating the effect of the commercial fertilizer Algasoil® on the production and nutritional value of kikuyo forage (Pennisetum clandestinum Hoechst, Ex Chiov.) and its economic feasibility in the dairy cattle production system in the El Encino farm. The “El Encino” farm is owned by the Blanco Porras family. The farm is located in Palmira, Zarcero, Alajuela, Costa Rica, located at 10 ° 12 '01.5 "north latitude and 84 ° 22' 57.4" west longitude, at a altitude of 1980 m. The farm receives an average annual precipitation of 2735 mm and has an average monthly temperature of 17.3 ° C and 80% relative humidity. In this project, four treatments were carried out: treatment 1 (farm management 113 kg of urea Ha-1); treatment 2 (farm management 113 kg of urea Ha-1 + 75 kg of Algasoil® Ha-1); treatment 3 (farm management 113 kg of urea Ha-1 + 50 kg of Algasoil® Ha-1) and treatment 4 (farm management 113 kg of urea Ha-1 + 25 kg of Algasoil® Ha-1). All treatments were applied by hand three days after each grazing cycle (1 day of grazing followed by 31 of rest). For the dry matter production, significant differences were found between treatments with Algasoil® and the control (3,427, 4,646, 4,486 and 4,179 kg MS Ha-1, for one through four treatments respectively). No significant differences in the value of the dry matter were found between treatments for any of the evaluated variables (ash 10.36%, ethereal extract 3.02%, FND 54%, FAD 28%, lignin 1.99% and PC 24.4%). Fertilization costs were higher for the control treatment as the application level of Algasoil® increased (costs were 29.907, 79.790, 63.149 and 46.528 colones Ha-1 respectively for treatments one through four)

    Measurement of the c-jet mistagging efficiency in t ¯t events using pp collision data at √ s = 13 TeV collected with the ATLAS detector

    Get PDF
    A technique is presented to measure the efficiency with which c-jets are mistagged as b-jets (mistagging efficiency) using t ¯t events, where one of theW bosons decays into an electron or muon and a neutrino and the other decays into a quark–antiquark pair. The measurement utilises the relatively large and known W → cs branching ratio, which allows ameasurement to be made in an inclusive c-jet sample. The data sample used was collected by the ATLAS detector at √ s = 13 TeV and corresponds to an integrated luminosity of 139 fb−1. Events are reconstructed using a kinematic likelihood technique which selects the mapping between jets and t ¯t decay products that yields the highest likelihood value. The distribution of the b-tagging discriminant for jets from the hadronic W decays in data is compared with that in simulation to extract the mistagging efficiency as a function of jet transverse momentum. The total uncertainties are in the range 3–17%. The measurements generally agree with those in simulation but there are some differences in the region corresponding to the most stringent b-jet tagging requirementANPCyTYerPhI, ArmeniaAustralian Research CouncilBMWFW, AustriaAustrian Science Fund (FWF)Azerbaijan National Academy of Sciences (ANAS)SSTC, BelarusConselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPQ)Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)Natural Sciences and Engineering Research Council of Canada (NSERC)NRC, CanadaCERNANID, ChileChinese Academy of SciencesMinistry of Science and Technology, ChinaMinciencias, ColombiaMinistry of Education, Youth & Sports - Czech Republic Czech Republic GovernmentCzech Republic GovernmentNational Research Foundation of KoreaDanish Natural Science Research CouncilCentre National de la Recherche Scientifique (CNRS)CEA-DRF/IRFU, FranceSRNSFG, GeorgiaFederal Ministry of Education & Research (BMBF)HGF, GermanyMax Planck SocietyGSRI, GreeceRGC, ChinaHong Kong SAR, ChinaIsrael Science FoundationBenoziyo Center, IsraelIstituto Nazionale di Fisica Nucleare (INFN)Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT)CNRST, MoroccoNetherlands Organization for Scientific Research (NWO) Netherlands GovernmentRCN, NorwayMinistry of Science and Higher Education, PolandNCN, PolandFundacao para a Ciencia e a Tecnologia (FCT)MNE/IFA, RomaniaJINRMES of RussiaNRC KIRussian FederationMinistry of Education, Science & Technological Development, SerbiaMSSR, SlovakiaSlovenian Research Agency - SloveniaMIZS, SloveniaDSI/NRF, South AfricaMinistry of Science and Innovation, Spain (MICINN) Spanish GovernmentSRC, SwedenWallenberg Foundation, SwedenSERI, SwitzerlandSwiss National Science Foundation (SNSF)Cantons of Bern and Geneva, SwitzerlandMinistry of Science and Technology, TaiwanMinistry of Energy & Natural Resources - TurkeyUK Research & Innovation (UKRI) Science & Technology Facilities Council (STFC)United States Department of Energy (DOE)National Science Foundation (NSF)BCKDF, CanadaCANARIE, CanadaCompute Canada, CanadaCRC, CanadaCOST, FranceERC, FranceERDF, FranceHorizon 2020, FranceMarie Sklodowska-Curie Actions, FranceEuropean Union, FranceFrench National Research Agency (ANR)German Research Foundation (DFG)Alexander von Humboldt FoundationHerakleitos programmeThales GroupAristeia programmeEU-ESF, GreeceGreek NSRF, GreeceBSFNSF, IsraelGerman-Israeli Foundation for Scientific Research and DevelopmentNorwegian FinancialMechanism 2014-2021, NorwayLa CaixaBanking Foundation, SpainGeneralitat de CatalunyaPROMETEO, SpainGenT Programmes Generalitat Valenciana, SpainGoran Gustafssons Stiftelse, SwedenRoyal Society of LondonLeverhulme TrustATLAS Tier-1 facilities at TRIUMF (Canada)NDGF (Denmark)NDGF (Norway)NDGF ( Sweden)CC-IN2P3 (France)KIT/GridKA (Germany)INFN-CNAF (Italy)Netherlands GovernmentPIC (Spain)ASGC (Taiwan)RAL (UK)BNL (USA

    Production of ϒ(nS) mesons in Pb + Pb and pp collisions at 5.02 TeV

    Get PDF
    A measurement of the production of vector bottomonium states, ϒ(1S), ϒ(2S), and ϒ(3S), in Pb + Pb and pp collisions at a center-of-mass energy per nucleon pair of 5.02 TeV is presented. The data correspond to integrated luminosities of 1.38 nb−1 of Pb + Pb data collected in 2018, 0.44 nb−1 of Pb + Pb data collected in 2015, and 0.26 fb−1 of pp data collected in 2017 by the ATLAS detector at the Large Hadron Collider. The measurements are performed in the dimuon decay channel for transverse momentum pμμ T < 30 GeV, absolute rapidity |yμμ| < 1.5, and Pb + Pb event centrality 0–80%. The production rates of the three bottomonium states in Pb + Pb collisions are compared with those in pp collisions to extract the nuclear modification factors as functions of event centrality, pμμ T , and |yμμ|. In addition, the suppression of the excited states relative to the ground state is studied. The results are compared with theoretical model calculations.ANPCyTYerPhI, ArmeniaAustralian Research CouncilBMWFW, AustriaAustrian Science Fund (FWF)Azerbaijan National Academy of Sciences (ANAS)Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPQ)Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)Natural Sciences and Engineering Research Council of Canada (NSERC)Canada Foundation for InnovationNational Natural Science Foundation of China (NSFC)MEYS CR, Czech RepublicNational Research Foundation of KoreaDanish Natural Science Research CouncilCentre National de la Recherche Scientifique (CNRS)CEA-DRF/IRFU, FranceFederal Ministry of Education & Research (BMBF)Max Planck SocietyHong Kong SAR, ChinaIsrael Science FoundationIstituto Nazionale di Fisica Nucleare (INFN)Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT)Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) Japan Society for the Promotion of ScienceCNRST, MoroccoRCN, NorwayMEiN, PolandFundacao para a Ciencia e a Tecnologia (FCT)MNE/IFA, RomaniaMinistry of Education, Science & Technological Development, SerbiaMSSR, SlovakiaSlovenian Research Agency - SloveniaMIZS, SloveniaSpanish GovernmentWallenberg Foundation, SwedenSERI, SwitzerlandMinistry of Science and Technology, TaiwanUnited States Department of Energy (DOE)National Science Foundation (NSF)BCKDF, CanadaCANARIE, CanadaCompute Canada, CanadaCzech Republic Government PRIMUS 21/SCI/017 UNCE SCI/013COST, European UnionEuropean Union (EU) European Research Council (ERC)European Union (EU) Marie Curie ActionsHorizon 2020, European UnionEuropean Union (EU) Marie Curie ActionsAgence Nationale de la Recherche (ANR)German Research Foundation (DFG)Alexander von Humboldt FoundationHerakleitos programme - EU-ESF, GreeceThales GroupAristeia programme - EU-ESF, GreeceGreek NSRF, GreeceBSF-NSF, IsraelMINERVA, IsraelNorwegian Financial Mechanism 2014-2021, NorwayNCN, PolandPolish National Agency for Academic Exchange (NAWA)La Caixa Banking Foundation, SpainCERCA Programme Generalitat de Catalunya, SpainPROMETEO Programme Generalitat Valenciana, SpainGenT Programme Generalitat Valenciana, SpainGoran Gustafssons Stiftelse, SwedenRoyal SocietyLeverhulme TrustUK Research & Innovation (UKRI) Science & Technology Facilities Council (STFC)TENMAK, TurkiyeCanton of Geneva, SwitzerlandCanton of Bern, SwitzerlandSwiss National Science Foundation (SNSF)SRC, SwedenDSI/NRF, South AfricaNetherlands Organization for Scientific Research (NWO) Netherlands GovernmentBenoziyo Center, IsraelRGC, ChinaGSRI, GreeceHGF, GermanySRNSFG, GeorgiaMinciencias, ColombiaMinistry of Science and Technology, ChinaChinese Academy of SciencesANID, ChileCERNNRC, Canad

    Measurement of the production of a W boson in association with a charmed hadron in pp collisions at ffiffi s p =13 TeV with the ATLAS detector

    Get PDF
    The production of a W boson in association with a single charm quark is studied using 140     fb − 1 of √ s = 13     TeV proton-proton collision data collected with the ATLAS detector at the Large Hadron Collider. The charm quark is tagged by the presence of a charmed hadron reconstructed with a secondary-vertex fit. The W boson is reconstructed from the decay to either an electron or a muon and the missing transverse momentum present in the event. The charmed mesons reconstructed are D + → K − π + π + and D * + → D 0 π + → ( K − π + ) π + and the charge conjugate decays in the fiducial regions where p T ( e , μ ) > 30     GeV , | η ( e , μ ) | < 2.5 , p T ( D ( * ) ) > 8     GeV , and | η ( D ( * ) ) | < 2.2 . The integrated and normalized differential cross sections as a function of the pseudorapidity of the lepton from the W boson decay, and of the transverse momentum of the charmed hadron, are extracted from the data using a profile likelihood fit. The measured total fiducial cross sections are σ OS – SS fid ( W − + D + ) = 50.2 ± 0.2 ( stat ) + 2.4 − 2.3 ( syst )     pb , σ OS – SS fid ( W + + D − ) = 48.5 ± 0.2 ( stat ) + 2.3 − 2.2 ( syst )     pb , σ OS – SS fid ( W − + D * + ) = 51.1 ± 0.4 ( stat ) + 1.9 − 1.8 ( syst )     pb , and σ OS – SS fid ( W + + D * − ) = 50.0 ± 0.4 ( stat ) + 1.9 − 1.8 ( syst )     pb . Results are compared with the predictions of next-to-leading-order quantum chromodynamics calculations performed using state-of-the-art parton distribution functions. Additionally, the ratio of charm to anticharm production cross sections is studied to probe the s − ¯ s quark asymmetry. The ratio is found to be R ± c = 0.971 ± 0.006 ( stat ) ± 0.011 ( syst ) . The ratio and cross-section measurements are consistent with the predictions obtained with parton distribution function sets that have a symmetric s − ¯ s sea, indicating that any s − ¯ s asymmetry in the Bjorken- x region relevant for this measurement is small.ANPCyTYerevaYerevan Physics Institute (YerPhI), Armenian Physics Institute (YerPhI), ArmeniaAustralian Research CouncilBMWFW, AustriaAustrian Science Fund (FWF)Azerbaijan National Academy of Sciences (ANAS)Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPQ)Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)Natural Sciences and Engineering Research Council of Canada (NSERC)NRC, CanadaCanada Foundation for InnovationCERNANID, ChileChinese Academy of SciencesMinistry of Science and Technology, ChinaNational Natural Science Foundation of China (NSFC)Minciencias, ColombiaMEYS CR, Czech RepublicNational Research Foundation of KoreaDanish Natural Science Research CouncilCentre National de la Recherche Scientifique (CNRS)Institut de recherche sur les lois fondamentales de l'Univers, Direction des Sciences de la Matiere, Commissariat a l'Energie Atomique (CEA-DRF/IRFU), FranceShota Rustaveli National Science Foundation of Georgia (SRNSFG), GeorgiaFederal Ministry of Education & Research (BMBF)HGF, GermanyMax Planck SocietyGeneral Secretariat for Research and Innovation (GSRI), GreeceRGC, ChinaHong Kong SAR, ChinaIsrael Science FoundationBenoziyo Center, IsraelIstituto Nazionale di Fisica Nucleare (INFN)Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT)Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) Japan Society for the Promotion of ScienceCNRST, MoroccoNetherlands Organization for Scientific Research (NWO) Netherlands GovernmentRCN, NorwayMEiN, PolandFundacao para a Ciencia e a Tecnologia (FCT)MNE/IFA, RomaniaMinistry of Education, Science & Technological Development, SerbiaMinistry of Education, Science, Research and Sport (MSSR), SlovakiaSlovenian Research Agency - SloveniaDSI/NRF, South AfricaSpanish GovernmentSwedish Research CouncilWallenberg Foundation, SwedenSERISwiss National Science Foundation (SNSF)Cantons of BernGeneva, SwitzerlandMIZZ, SloveniaMinistry of Science and Technology, TaiwanTENMAK, TuerkiyeUK Research & Innovation (UKRI) Science & Technology Facilities Council (STFC)United States Department of Energy (DOE)National Science Foundation (NSF)BCKDFCANARIECompute CanadaCRC, CanadaRIMUS Research ProgrammeUniversity Research Center, Czech RepublicEuropean Cooperation in Science and Technology (COST)European Research Council (ERC)European Union (EU)Horizon 2020European Union (EU) Marie Curie ActionsAgence Nationale de la Recherche (ANR)German Research Foundation (DFG)Alexander von Humboldt FoundationThales GroupEuropean Union (EU)National Strategic Reference Framework (Greek NSRF), GreeceBSF-NSFMINERVA Foundation (MINERVA), IsraelNorwegian Financial Mechanism 2014-2021, Norway PRIMUS 21/SCI/017NCNPolish National Agency for Academic Exchange (NAWA)La Caixa FoundationCERCA Programme Generalitat de CatalunyaPROMETEOGenT Programmes Generalitat Valenciana (PROMETEO)GenT Programmes Generalitat Valenciana, SpainGoeran Gustafssons Stiftelse, SwedenRoyal Society Leverhulme Trust UNCE SCI/01

    Inclusive and differential cross-sections for dilepton t¯t production measured in p s = 13 TeV pp collisions with the ATLAS detector

    Get PDF
    Differential and double-differential distributions of kinematic variables of leptons from decays of top-quark pairs (tt¯ ) are measured using the full LHC Run 2 data sample collected with the ATLAS detector. The data were collected at a pp collision energy of s√ = 13 TeV and correspond to an integrated luminosity of 140 fb−1. The measurements use events containing an oppositely charged eμ pair and b-tagged jets. The results are compared with predictions from several Monte Carlo generators. While no prediction is found to be consistent with all distributions, a better agreement with measurements of the lepton pT distributions is obtained by reweighting the tt¯ sample so as to reproduce the top-quark pT distribution from an NNLO calculation. The inclusive top-quark pair production cross-section is measured as well, both in a fiducial region and in the full phase-space. The total inclusive cross-section is found to be σtt¯=829±1 (stat)±13 (syst)±8 (lumi)±2 (beam) pb, where the uncertainties are due to statistics, systematic effects, the integrated luminosity and the beam energy. This is in excellent agreement with the theoretical expectation.CEA-DRFCantons of Bern and GenevaDNSRCEU-ESFGenT Programmes Generalitat Valenciana, SpainLa Caixa Banking FoundationMIZŠMNENorwegian Financial MechanismPROMETEORGCUNCEWallenberg FoundationNational Science FoundationU.S. Department of EnergyAlexander von Humboldt-StiftungCRC Health GroupCanarieH2020 Marie Skłodowska-Curie ActionsMultiple Sclerosis Scientific Research FoundationCERNCompute CanadaGöran Gustafssons StiftelserNatural Sciences and Engineering Research Council of CanadaNational Research Council CanadaCanada Foundation for InnovationScience and Technology Facilities CouncilLeverhulme TrustEuropean Research CouncilEuropean Cooperation in Science and TechnologyAustralian Research CouncilNational Stroke FoundationNeurosurgical Research FoundationHelmholtz-GemeinschaftMinerva FoundationDeutsche ForschungsgemeinschaftAgence Nationale de la RechercheJapan Society for the Promotion of ScienceMinistry of Education, Culture, Sports, Science and TechnologySchweizerischer Nationalfonds zur Förderung der Wissenschaftlichen ForschungDanmarks GrundforskningsfondFundação de Amparo à Pesquisa do Estado de São PauloNational Natural Science Foundation of ChinaMinisterstvo Školství, Mládeže a TělovýchovyFundação para a Ciência e a TecnologiaBundesministerium für Bildung und ForschungChinese Academy of SciencesAustrian Science FundAustrian Science FundMinistry of Science and Technology of the People's Republic of ChinaAgencia Nacional de Promoción Científica y TecnológicaNederlandse Organisatie voor Wetenschappelijk OnderzoekBundesministerium für Wissenschaft, Forschung und WirtschaftConselho Nacional de Desenvolvimento Científico e TecnológicoNella and Leon Benoziyo Center for Neurological Diseases, Weizmann Institute of ScienceIsrael Science FoundationInstituto Nazionale di Fisica NucleareNarodowe Centrum NaukiJavna Agencija za Raziskovalno Dejavnost RSMinistarstvo Prosvete, Nauke i Tehnološkog RazvojaMinisterio de Ciencia e InnovaciónCentre National pour la Recherche Scientifique et TechniqueStaatssekretariat für Bildung, Forschung und InnovationHorizon 2020British Columbia Knowledge Development FundEuropean Regional Development FundDefence Science InstituteNarodowa Agencja Wymiany AkademickiejInstitutul de Fizică AtomicăAgencia Nacional de Investigación y DesarrolloRoyal Society of South AustraliaIrish Rugby Football Unio

    Strong Constraints on Jet Quenching in Centrality-Dependent p + Pb Collisions at 5.02 TeV from ATLAS

    Get PDF
    Jet quenching is the process of color-charged partons losing energy via interactions with quark-gluon plasma droplets created in heavy-ion collisions. The collective expansion of such droplets is well described by viscous hydrodynamics. Similar evidence of collectivity is consistently observed in smaller collision systems, including pp and p þ Pb collisions. In contrast, while jet quenching is observed in Pb þ Pb collisions, no evidence has been found in these small systems to date, raising fundamental questions about the nature of the system created in these collisions. The ATLAS experiment at the Large Hadron Collider has measured the yield of charged hadrons correlated with reconstructed jets in 0.36 nb−1 of p þ Pb and 3.6 pb−1 of pp collisions at 5.02 TeV. The yields of charged hadrons with pch T > 0.5 GeV near and opposite in azimuth to jets with pjet T > 30 or 60 GeV, and the ratios of these yields between p þ Pb and pp collisions, IpPb, are reported. The collision centrality of p þ Pb events is categorized by the energy deposited by forward neutrons from the struck nucleus. The IpPb values are consistent with unity within a few percent for hadrons with pch T > 4 GeV at all centralities. These data provide new, strong constraints that preclude almost any parton energy loss in central p þ Pb collisions.BSF-NSFCEA-DRFCantons of Bern and GenevaDNSRC IN2P3-CNRSEU-ESFGenT Programmes Generalitat Valenciana, SpainGridKAINFN-CNAFLa Caixa Banking FoundationMIZŠMNENDGFNDGFNorwegian Financial Mechanism 2014-2021PROMETEORGCUNCE SCI/013UNCE SCI/013Wallenberg FoundationU.S. Department of EnergyAlexander von Humboldt-StiftungAlabama Space Grant ConsortiumBrookhaven National LaboratoryCRC Health GroupCanarieKarlsruhe Institute of TechnologyH2020 Marie Skłodowska-Curie ActionsMultiple Sclerosis Scientific Research FoundationCERNCompute CanadaGöran Gustafssons StiftelserNatural Sciences and Engineering Research Council of CanadaNational Research Council CanadaCanada Foundation for InnovationScience and Technology Facilities CouncilLeverhulme TrustEuropean Research CouncilEuropean Cooperation in Science and TechnologyAustralian Research CouncilNational Stroke FoundationNeurosurgical Research FoundationHelmholtz-GemeinschaftHelmholtz-GemeinschaftMinerva FoundationDeutsche ForschungsgemeinschaftAgence Nationale de la RechercheJapan Society for the Promotion of ScienceMinistry of Education, Culture, Sports, Science and TechnologySchweizerischer Nationalfonds zur Förderung der Wissenschaftlichen ForschungDanmarks GrundforskningsfondFundação de Amparo à Pesquisa do Estado de São PauloNational Natural Science Foundation of ChinaFundação para a Ciência e a TecnologiaBundesministerium für Bildung und ForschungChinese Academy of SciencesAustrian Science FundGeneralitat de CatalunyaMinistry of Science and Technology of the People's Republic of ChinaAgencia Nacional de Promoción Científica y TecnológicaNederlandse Organisatie voor Wetenschappelijk OnderzoekBundesministerium für Wissenschaft, Forschung und WirtschaftConselho Nacional de Desenvolvimento Científico e TecnológicoNella and Leon Benoziyo Center for Neurological Diseases, Weizmann Institute of ScienceIsrael Science FoundationInstituto Nazionale di Fisica NucleareNarodowe Centrum NaukiJavna Agencija za Raziskovalno Dejavnost RSMinistarstvo Prosvete, Nauke i Tehnološkog RazvojaMinisterio de Ciencia e InnovaciónCentre National pour la Recherche Scientifique et TechniqueStaatssekretariat für Bildung, Forschung und InnovationHorizon 2020British Columbia Knowledge Development FundEuropean Regional Development FundDefence Science InstituteNarodowa Agencja Wymiany AkademickiejInstitutul de Fizică AtomicăAgencia Nacional de Investigación y DesarrollRoyal Society of South Australi
    corecore