[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-664712-105":59,"doc-detail-664712-en":130},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":123,"head_meta":125,"extra_data":127,"updated_unix":129},105,"en","introduction-to-particle-particles-chapter-1-motivation","Introduction to Particle Particles - Chapter 1 - Motivation","","Introduction to Particle Particles (18/03/2020) presents Feynman diagrams as a practical tool for visualising quantum interactions in particle scattering. It motivates why these diagrams are useful, then builds the core interpretation at the quantum level: elementary particles interact through exchange of force carriers. The material also outlines how to draw diagrams for reactions involving composite hadrons, including quark decomposition and consistent quantum-number bookkeeping, and how to arrange initial- and final-state particles.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":40,"@type":76,"position":81},"https://docshare.wps.com/document/research-report/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/introduction-to-particle-particles-chapter-1-motivation/664712/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/introduction-to-particle-particles-chapter-1-motivation/664712.png","ImageObject",300,407,{"name":92,"@type":93},"cimolpedes","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-30","2026-10-29",true,{"@type":102,"interactionType":103,"userInteractionCount":81},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What do Feynman diagrams represent in particle scattering?","Question",{"text":112,"@type":113},"They visualise the trajectories of particles in space and time during a scattering reaction, making quantum interactions easier to understand.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How do elementary particles interact according to the lecture?",{"text":117,"@type":113},"They interact through exchange of force carriers, such as photons in Quantum Electrodynamics.",{"name":119,"@type":110,"acceptedAnswer":120},"How should one start drawing a Feynman diagram for a reaction involving composite hadrons?",{"text":121,"@type":113},"First determine the hadron’s quark decomposition while ensuring all quantum numbers add up consistently.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},664712,1793268627,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":39,"category_name":40,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":81,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":11,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":129,"read_time":143},962094243610,"https://ap-avatar.wpscdn.com/davatar_3d24733baf745e90a7e4bdd5f77d97b2","Feynman diagrams in Particle Physics  \nDr Juan Rojo  \nVU Amsterdam and Nikhef Theory group  \n[j.rojo@vu. nl](j.rojo@vu. nl)  \nadditional material: [https://juanrojo.com/teaching/](https://juanrojo.com/teaching/)  \nJuan Rojo  \n1  \nIntroduction to Particle Particles, 18/03/2020  \nOutline  \n Motivation: what Feynman diagrams are useful for?  \n Feynman diagrams in Quantum Electrodynamics  \n Feynman diagrams in Quantum Chromodynamics  \n Feynman diagrams in Electroweak Theory  \n Effective Theories and Feynman diagrams  \n2  \nJuan Rojo Introduction to Particle Particles, 18/03/2020  \nMotivation  \n3  \nJuan Rojo Introduction to Particle Particles, 18/03/2020  \nFeynman diagrams  \nAt the quantum level, fundamental interactions look very different that at the classical level  \nElementary particles interact by exchanging force carriers among them  \nFor example, the photon is the force carried particle of Quantum Electrodynamics, the quantum version of classical electromagnetic theory  \nA powerful tool to visualise interactions between elementary particles is known as Feynman diagrams, that represent the trajectories in space and time of the  \nparticles involved in a scattering reaction  \n4  \nJuan Rojo Introduction to Particle Particles, 18/03/2020  \nFeynman diagrams  \nAt the quantum level, fundamental interactions look very different that at the classical level  \nElementary particles interact by exchanging force carriers among them  \n5  \nJuan Rojo Introduction to Particle Particles, 18/03/2020  \nFeynman diagrams  \nAt the quantum level, fundamental interactions look very different that at the classical level  \nElementary particles interact by exchanging force carriers among them  \n6  \nJuan Rojo Introduction to Particle Particles, 18/03/2020  \nDrawing Feynman diagrams  \nIf the scattering reaction involves composite particles (hadrons) first of all determine their quark decomposition making sure all quantum numbers add up consistently  \n7  \nJuan Rojo Introduction to Particle Particles, 18/03/2020  \nDrawing Feynman diagrams  \nIf the scattering reaction involves composite particles (hadrons) first of all determine their quark decomposition making sure all quantum numbers add up consistently  \nThen put at the left of the diagram the initial-state particles and at the right of the diagram the final-state particles  \n8  \nJuan Rojo Introduction to Particle Particles, 18/03/2020  \nDrawing Feynman diagrams  \nIf the scattering reaction involves composite particles (hadrons) first of all determine their quark decomposition making sure all quantum numbers add up consistently  \nThen put at the left of the diagram the initial-state particles and at the right of the diagram the final-state particles  \nAttempt to connect the initial and final state particles among them. Note that some particles will not interact and will be just spectators in the reaction  \n9  \nJuan Rojo Introduction to Particle Particles, 18/03/2020  \nDrawing Feynman diagrams  \nIf the scattering reaction involves composite particles (hadrons) first of all determine their quark decomposition making sure all quantum numbers add up consistently  \nThen put at the left of the diagram the initial-state particles and at the right of the diagram the final-state particles  \nAttempt to connect the initial and final state particles among them. Note that some particles will not interact and will be just spectators in the reaction  \nMake sure that all interaction vertices conserve the corresponding quantum numbers: for example, if gluons or photons are conserved, then Q, B, S, C, b,…should be conserved  \n10  \nJuan Rojo Introduction to Particle Particles, 18/03/2020","cbCaiaS9nLDjMKgF","https://ap.wps.com/l/cbCaiaS9nLDjMKgF","pdf",6845083,"English","# Introduction\n## Motivation: what Feynman diagrams are useful for?\n## Feynman diagrams in Quantum Electrodynamics\n## Feynman diagrams in Quantum Chromodynamics\n## Feynman diagrams in Electroweak Theory\n## Effective Theories and Feynman diagrams\n# Drawing Feynman diagrams\n## Composite particles (hadrons) and quark decomposition\n## Initial-state and final-state placement\n## Connecting interactions and spectators\n## Quantum-number conservation at vertices","[{\"question\":\"What do Feynman diagrams represent in particle scattering?\",\"answer\":\"They visualise the trajectories of particles in space and time during a scattering reaction, making quantum interactions easier to understand.\"},{\"question\":\"How do elementary particles interact according to the lecture?\",\"answer\":\"They interact through exchange of force carriers, such as photons in Quantum Electrodynamics.\"},{\"question\":\"How should one start drawing a Feynman diagram for a reaction involving composite hadrons?\",\"answer\":\"First determine the hadron’s quark decomposition while ensuring all quantum numbers add up consistently.\"}]","Introduction to Particle Particles - Chapter 1 - Motivation | PDF",227]