{"id":3232,"date":"2025-12-19T09:07:37","date_gmt":"2025-12-19T08:07:37","guid":{"rendered":"https:\/\/www.thphys.uni-heidelberg.de\/aitp\/?page_id=3232"},"modified":"2026-01-17T21:26:12","modified_gmt":"2026-01-17T20:26:12","slug":"anja-butter","status":"publish","type":"page","link":"https:\/\/www.thphys.uni-heidelberg.de\/aitp\/anja-butter\/","title":{"rendered":"Anja Butter"},"content":{"rendered":"<figure class=\"wp-block-post-featured-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1536\" height=\"635\" src=\"https:\/\/www.thphys.uni-heidelberg.de\/aitp\/wp-content\/uploads\/2026\/01\/bridge_HD_PA-1.png\" class=\"attachment-full size-full wp-post-image\" alt=\"\" style=\"object-fit:cover;\" srcset=\"https:\/\/www.thphys.uni-heidelberg.de\/aitp\/wp-content\/uploads\/2026\/01\/bridge_HD_PA-1.png 1536w, https:\/\/www.thphys.uni-heidelberg.de\/aitp\/wp-content\/uploads\/2026\/01\/bridge_HD_PA-1-300x124.png 300w, https:\/\/www.thphys.uni-heidelberg.de\/aitp\/wp-content\/uploads\/2026\/01\/bridge_HD_PA-1-1024x423.png 1024w, https:\/\/www.thphys.uni-heidelberg.de\/aitp\/wp-content\/uploads\/2026\/01\/bridge_HD_PA-1-768x318.png 768w\" sizes=\"auto, (max-width: 1536px) 100vw, 1536px\" \/><\/figure>\n\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-group alignfull has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\">\n<div class=\"wp-block-columns alignwide is-layout-flex wp-container-core-columns-is-layout-7fc3d43a wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:65%\">\n<h2 class=\"wp-block-heading\">ML bridges for  particle physics<\/h2>\n\n\n\n<p>Breaking things is one of the most efficient \u2014 and most entertaining \u2014 ways to learn something new. Luckily for us, machine learning is currently breaking down many long\u2011standing boundaries in particle physics, opening the door to new, ML\u2011based approaches for theory\u2011inspired and ML\u2011supported data analysis.<\/p>\n\n\n\n<p>Connecting Paris and Heidelberg, particle physics and computing, theory and experiment, my group and I work at the intersection of our favorite topics to learn more about particle physics and to develop increasingly powerful methods for analyzing LHC data. Over the past years, we have built a strong collaboration between LPNHE and ITP, leading to numerous joint research projects, workshops, and exchange programs.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">Neural networks for precision predictions<\/h5>\n\n\n\n<p>Precision predictions are essential for the success of the LHC physics program. To overcome current bottlenecks in high\u2011precision calculations, we develop neural\u2011network\u2011based methods that improve the efficiency and accuracy of various steps in the simulation chain. Our work includes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Precise estimation of scattering amplitudes<\/li>\n\n\n\n<li>Optimized phase\u2011space sampling<\/li>\n\n\n\n<li>Data\u2011driven hadronization models<\/li>\n\n\n\n<li>Fast and accurate detector simulations<\/li>\n<\/ul>\n\n\n\n<p>We employ a broad range of machine\u2011learning techniques, with a particular focus on generative models \u2014 from normalizing flows to diffusion models \u2014 including new approaches for reliable uncertainty estimation.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">Inverse problems or how to unfold the LHC<\/h5>\n\n\n\n<p>In an ideal world, we would have unbiased and precise methods to constrain the fundamental parameters of the Standard Model and beyond\u2011the\u2011Standard\u2011Model theories using the full, high\u2011dimensional LHC dataset. ML\u2011based unfolding takes a first step toward this goal.<\/p>\n\n\n\n<p>We develop novel methods that predict probability distributions over likely parton\u2011level or particle\u2011level configurations given a measured detector\u2011level event. This enables a significantly more direct interpretation of unfolded data and allows constraints on Lagrangian parameters to be derived in a transparent and statistically robust way.<\/p>\n\n\n\n<p>If you wanna discuss the latest ML ideas for better physics or just enjoy the view on my favorite cities, you can find me either at<\/p>\n\n\n\n<div class=\"wp-block-group has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\">\n<div class=\"wp-block-group has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\">\n<p><a href=\"https:\/\/lpnhe.in2p3.fr\/\" target=\"_blank\" rel=\"noreferrer noopener nofollow\"><\/a><a href=\"https:\/\/www.thphys.uni-heidelberg.de\/index.php?lang=e\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">LPNHE<\/a><br>4 Place Jussieu<br>1222-2-06 (read: between towers 12 and 22, 2nd floor, office 06)<br>75005 Paris, France<\/p>\n<\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Email: <a href=\"mailto:anja.butter@lpnhe.in2p3.fr\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">anja.butter@lpnhe.in2p3.fr<\/a><\/li>\n<\/ul>\n<\/div>\n\n\n\n<p>or at <\/p>\n\n\n\n<p><a href=\"https:\/\/www.thphys.uni-heidelberg.de\/index.php?lang=e\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">Institut f\u00fcr Theoretische Physik<\/a><br><a href=\"https:\/\/www.uni-heidelberg.de\/en\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">Universit\u00e4t Heidelberg<\/a><br>Philosophenweg 16<br>69120 Heidelberg, Germany<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Email: <a href=\"mailto:butter@thphys.uni-heidelberg.de\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">butter@thphys.uni-heidelberg.de<\/a><\/li>\n\n\n\n<li>Phone: +49 6221 54-9406<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button is-style-fill\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/www.thphys.uni-heidelberg.de\/~butter\/include\/cv.pdf\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">CV \u2794<\/a><\/div>\n\n\n\n<div class=\"wp-block-button is-style-fill\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/inspirehep.net\/authors\/1790622\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">INSPIRE-HEP \u2794<\/a><\/div>\n\n\n\n<div class=\"wp-block-button is-style-fill\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/scholar.google.com\/citations?user=zzfoadcAAAAJ&amp;hl=en\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">Google Scholar \u2794<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-top is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:35%\">\n<div class=\"wp-block-group has-custom-siegel-hintergrund-25-background-color has-background has-global-padding is-layout-constrained wp-container-core-group-is-layout-594587f7 wp-block-group-is-layout-constrained\" style=\"padding-top:var(--wp--preset--spacing--20);padding-right:var(--wp--preset--spacing--30);padding-bottom:var(--wp--preset--spacing--20);padding-left:var(--wp--preset--spacing--30)\">\n<h4 class=\"wp-block-heading\">News and Events<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Welcome to Suprio Dubey \ud83d\ude42<\/li>\n\n\n\n<li>Latest Paper: <a href=\"https:\/\/arxiv.org\/pdf\/2510.19906\">Generative Unfolding of Jets and Their Substructure<\/a><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<figure class=\"wp-block-image size-full is-style-rounded is-style-rounded--1\"><img loading=\"lazy\" decoding=\"async\" width=\"960\" height=\"960\" src=\"https:\/\/www.thphys.uni-heidelberg.de\/aitp\/wp-content\/uploads\/2025\/02\/butter1-2.jpeg\" alt=\"\" class=\"wp-image-278\" srcset=\"https:\/\/www.thphys.uni-heidelberg.de\/aitp\/wp-content\/uploads\/2025\/02\/butter1-2.jpeg 960w, https:\/\/www.thphys.uni-heidelberg.de\/aitp\/wp-content\/uploads\/2025\/02\/butter1-2-300x300.jpeg 300w, https:\/\/www.thphys.uni-heidelberg.de\/aitp\/wp-content\/uploads\/2025\/02\/butter1-2-150x150.jpeg 150w\" sizes=\"auto, (max-width: 960px) 100vw, 960px\" \/><\/figure>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>ML bridges for particle physics Breaking things is one of the most efficient \u2014 and most entertaining \u2014 ways to learn something new. Luckily for us, machine learning is currently breaking down many long\u2011standing boundaries in particle physics, opening the door to new, ML\u2011based approaches for theory\u2011inspired and ML\u2011supported data analysis. Connecting Paris and Heidelberg, [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":3296,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"anja","meta":{"footnotes":""},"class_list":["post-3232","page","type-page","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/www.thphys.uni-heidelberg.de\/aitp\/wp-json\/wp\/v2\/pages\/3232","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.thphys.uni-heidelberg.de\/aitp\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.thphys.uni-heidelberg.de\/aitp\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.thphys.uni-heidelberg.de\/aitp\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.thphys.uni-heidelberg.de\/aitp\/wp-json\/wp\/v2\/comments?post=3232"}],"version-history":[{"count":22,"href":"https:\/\/www.thphys.uni-heidelberg.de\/aitp\/wp-json\/wp\/v2\/pages\/3232\/revisions"}],"predecessor-version":[{"id":3444,"href":"https:\/\/www.thphys.uni-heidelberg.de\/aitp\/wp-json\/wp\/v2\/pages\/3232\/revisions\/3444"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.thphys.uni-heidelberg.de\/aitp\/wp-json\/wp\/v2\/media\/3296"}],"wp:attachment":[{"href":"https:\/\/www.thphys.uni-heidelberg.de\/aitp\/wp-json\/wp\/v2\/media?parent=3232"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}