# Welcome

The Collaborative Research Center “Particle Physics Phenomenology after the Higgs Discovery'' is a joint venture of theoretical particle physicists from Karlsruhe Institute of Technology, RWTH Aachen University, University of Siegen and Heidelberg University. It is supported by the German Research Foundation (DFG).

Particle physics has long established itself as an important research discipline focused on understanding Nature at a fundamental level. The current knowledge is summarized in a theory called the Standard Model (SM) of particle physics that describes strong and electroweak interactions. The discovery of the Higgs boson in 2012 formally completes the SM and provides us with a consistent mathematical framework that can be used to describe Nature in fine detail. However, several aspects of the SM force us to raise questions about the foundations of this theory. Many proposed answers to these questions suggest that the SM is a low-energy approximation to a much more fundamental theory that we strive to discover.

Scientists of the CRC will conduct research in the phenomenology of elementary particles, focusing in particular on physics related to the Higgs boson, the physics of top quarks, electroweak gauge bosons, jets and dark matter, as well as flavour physics. Our goal is to develop novel concepts and methodologies to search for physics beyond the Standard Model through precise measurements at the LHC, at flavour factories and elsewhere.

### Open positions

The Collaborative Research Center invites applications for a number of postdoctoral and Ph.D. positions. More information can be found here, or directly contact the principal investigators.

##### News

17.07.2023-21.07.2023 - 11th International Workshop on Charm Physics (CHARM 2023) The purpose of the CHARM 2023 Workshop is to bring together theorists and experimentalists working in charm physics to discuss recent results in this area, including the impact on and from theory as well as projections for results to be expected from upcoming experimental facilities. More information can be found here

20.03.2023-24.03.2023 - 86th Annual Conference of the DPG and DPG Spring Meeting . The German Physical Society (Deutsche Physikalische Gesellschaft - DPG) Spring Meeting of the Matter and Cosmos Section (SMuK) will take place on the campus of the Technical University Dresden. The conference is organised by many divisions and working groups, among other by the Particle Physics division. More information can be found here: here

20.03.2023-24.03.2023 - The Gradient Flow in QCD and other Strongly Coupled Field Theories workshop will bring together experts in lattice and perturbative QCD to discuss recent progress in the application of the gradient flow, develop common ideas, identify needs and possibilities for the gradient flow and to spark collaborative efforts. More information can be found here

01.03.2023-02.03.2023 - The Annual Meeting of the CRC TRR 257 will take place at RWTH Aachen. A summary of the first funding period as well as new projects will be presented. In addition, former CRC members will present their current research. More information can be found here

13.02.2023-16.02.2023 - Mathematical Structures in Feynman Integrals . The workshop aims at bringing together experts from Mathematics and Physics to discuss the latest developments and future directions in unraveling the Mathematical Structures in Feynman Integrals. Topics will include among others Structures of Feynman integrals, Integral reduction, Applications from algebraic geometry, Finite fields and rational reconstruction, Differential equations, etc. The program will feature dedicated talks, but will also leave ample time for discussions among workshop participants. More information can be found here.

28.11.2022-30.11.2022 - The 19th Workshop of the LHC Higgs Working Group will take place in-person at CERN, but a video connection will be available for those who cannot travel to CERN. The aim of the LHC Higgs Working Group (LHCHWG) is to collect and produce theoretical predictions relevant for Higgs physics in the Standard Model and beyond. More information can be found here.

24.11.2022–27.11.2022 - The 26th Conference of Women in Physics (Deutsche Physikerinnentagung) offers female physicists at different career levels the possibility for networking and professional exchange. The program of the conference covers scientific talks from different areas of physics – this year with special focus on the research performed at KIT, the presentation of professional perspectives for physicists, school and didactic events as well as events on topics like equal opportunities, work-life balance, or career management. This year's conference has been hosted by KIT, the organisation was led by Prof. Margarete Mühlleitner, a PI of the CRC. More information can be found here.

07.11.2022–11.11.2022 - The Higgs 2022 Conference will focus on new experimental and theoretical results on the Higgs boson. Latest measurement of the Higgs boson properties and recent theoretical developments in the Higgs boson sector, in the Standard Model and in physics Beyond the Standard Model will be presented and discussed at the Conference. Contributions will be organised in several parallel and plenary sessions. More information can be found here

27.09.2022-30.09.2022 - The annual DESY Theory Workshop - Higgs, Flavour and Beyond - is organised by the elementary particle physics community in Germany. The focus is on a topical subject in theoretical particle physics and related fields. The workshop features: a) plenary sessions of specialised talks by invited speakers, b) parallel sessions, allowing young researchers to present their work (Wednesday and Thursday afternoon) and c) the DESY Heinrich-Hertz-Lecture on Physics for public outreach. More information can be found here

20.09.2022–22.09.2022 - The Eighth International Workshop on High Precision for Hard Processes at the LHC - HP2 2022 - will be hosted by the IPPP, University of Durham at the Discovery Museum in Newcastle, UK. This series of workshops is devoted to high precision studies of hard scattering processes at hadron colliders. The main themes of these workshops are recent developments and new results in theoretical computations in quantum field theory and their applications to collider phenomenology. More information can be found here

12.09.2022-14.09.2022 - The 12th workshop of the - Higgs Hunting - series will present an overview of the following topics: new physics through precision studies of the properties of the Higgs boson, new production and decay modes and new Higgs-like states and signals for physics beyond the Standard Model. It will focus on new developments in the LHC Run-2 analyses, detailed studies of Higgs boson properties and possible deviations from Standard Model predictions. Highlights will also include a first look at LHC Run-3 analyses, prospects from studies at future colliders, and recent theoretical developments. More information can be found here

04.09.2022-09.09.2022 - TOP2022 - The 15th International Workshop on Top-Quark Physics will be held at Durham University, Durham (UK). It brings together experimentalists and theorists to present and discuss the latest developments in top-quark physics. This year's programme includes a mini-workshop on the connection between top and flavour physics. More information can be found here

06.07.2022-13.07.2022 - ICHEP 2022 - The XLI International Conference on High Energy Physics. ICHEP has been held every two years for more than 50 years, and is the reference conference of particle physics where most relevant results are presented. At ICHEP, physicists from around the world gather to share the latest advancements in particle physics, astrophysics/cosmology, and accelerator science and discuss plans for major future facilities. More information can be found here

08.06.2022-10.06.2022 - The Young Scientists Meeting is a three-day meeting for all members of the Collaborative Research Center (CRC) TRR 257. Besides scientific talks, this workshop also includes talks about soft skills and gender equality. More information can be found here:

31.05.2022-02.06.2022 - Status and propects of Non-leptonic B meson decay. The aim of this event is to discuss the current status in theory and experiment of non-leptonic B meson decays. This entails talks on calculation techniques, including QCD factorization and perturbative QCD with special emphasis on the current status of estimating power corrections. More information can be found here

16.05.2022-20.05.2022 - The programme of the 10th Edition of the Large Hadron Collider Physics Conference - LHCP2022 - will contain a detailed review of the latest experimental and theoretical results on collider physics, with many final results of the Large Hadron Collider Run-2, potentially a first glimpse of the upgraded accelerator and detector operation in Run-3, and discussions on further research directions within the high energy particle physics community, both in theory and experiment. The main goal of the conference is to provide intense and lively discussions between experimenters and theorists in such research areas as the Standard Model Physics and Beyond, the Higgs Boson, Heavy Quark Physics and Heavy Ion Physics as well as to share recent progress in the high luminosity upgrades and future collider developments. More information can be found here

12.05.2022-15.05.2022 - LoopFest XX conference, University of Pittsburgh, USA. LoopFest provides a forum for discussing the latest results in precision quantum field theory and their applications to understanding experimental data at current and future colliders.Topics include: a) The potential of the LHC and future colliders for precision measurements b) Progress in multi-loop and multi-leg calculations c) Interfacing fixed-order higher-order calculations with multi-purpose event generators d) Application of effective field theory techniques to precision calculations e) Prospects for improving PDFs for precision measurements. More information can be found here

25.04.2022-30.04.2022 - The 16th Workshop on Elementary Particle Physics: Loops and Legs in Quantum Field Theory, Ettal, Germany. Topics discussed: Precision calculations and technology for scattering cross sections at high energy colliders, computer algebra, related mathematical developments, algorithms and methods, higher loop and multi-leg calculations. More information can be found here

11.04.2022-14.04.2022 - The Standard Model at the LHC workshop - SM@LHC 2022 - deals with the latest developments as well as future prospects in Standard Model phenomenology at the LHC. The emphasis lies in bringing together experimentalists and theorists to stimulate discussions on the most interesting and topical aspects across the various fields. The main topics include Electroweak, Higgs, QCD, Top, Flavour Physics and EFT . More information can be found here:

29.11.2021 - The third and the last session in 2021 Public Speaking & Presentation Skills Training including Video Analysis will take place on Monday, November 29th from 09:00 till 13:00. Individual trainings will take place on Monday, November 29th (14:00-17:00) and on Tuesday, November 30th (13:00-17:00). Our trainer is Mrs. Sonja Fuhrmann - TV-journalist, TV-presenter and trainer for rhetoric and voice.

11.11.2021 - The second session Public Speaking & Presentation Skills Training including Video Analysis will take place on Thursday, November 11th from 12:00 till 16:00. Individual trainings will take place on Friday, November 12th from 9:00 till 15:00. Our trainer is Mrs. Sonja Fuhrmann - TV-journalist, TV-presenter and trainer for rhetoric and voice.

01.07.2021 - The first session Public Speaking & Presentation Skills Training including Video Analysis will take place on Thursday, July 1st from 09:00 till 13:00. Individual trainings will take place on Thursday, July 1st (14:00-17:00) and on Friday, July 2nd (13:00-17:00). Our trainer is Mrs. Sonja Fuhrmann - TV-journalist, TV-presenter and trainer for rhetoric and voice.

16.06.2021 - The second (virtual) session Physicists in Industry will take place on Wednesday, June 16th at 4.00pm. Our second speaker is Dr. Waldemar Martens (European Space Agency, ESA).

26.05.2021 - The annual meeting of the CRC TRR 257 “Particle Physics Phenomenology after the Higgs Discovery'' took place (virtually) in Aachen from May 26th to May 28th. Presentations are available online.

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##### Recent Seminars
EFT Interpretations

Ilaria Brivio (University of Bologna, Italy), 11.07.2023, Aachen

KATRIN experiment - What is the absolute mass scale of neutrinos?

Markus Steidl (KIT, Karlsruhe), 25.04.2023, Aachen

Jet identification and flavoured jet algorithms

Rene Poncelet (Cambridge University, UK), 18.04.2023, Aachen

Matching and Merging: Combining Matrix Elements and Parton Showers

Rikkert Frederix (Lund University, Sweden), 11.04.2023, Aachen

Jet event shapes at the LHC and the precision determination of alpha_s from jet data

Javier Llorente (Simon Fraser University, Canada), 04.04.2023, Aachen

Neutrinoless double beta decay

Fabian Kuger, 16.02.2023, Karlsruhe

TBA

Ferrucio Feruglio, 16.02.2023, Karlsruhe

Building the future together

Jorgen d’Hondt, 09.02.2023, Karlsruhe

##### Recent Publications
Learning the language of QCD jets with transformers

Thorben Finke, Michael Krämer, Alexander Mück, Jan Tönshoff

Full NLO QCD predictions for Higgs-pair production in the 2-Higgs-Doublet Model

J. Baglio, F. Campanario, S. Glaus, M. Mühlleitner, J. Ronca, M. Spira

A coup de grace to the charged Higgs solution to $P_5^\prime$ and $R_{D^{(*)}}$ discrepancies

Syuhei Iguro

Studies of New Physics in $B^0_q-\bar B^0_q$ Mixing and Implications for Leptonic Decays

Kristof De Bruyn, Robert Fleischer, Eleftheria Malami, Philine van Vliet

A new puzzle in non-leptonic B decays

Aritra Biswas, Sebastien Descotes-Genon, Joaquim Matias, Gilberto Tetlalmatzi-Xolocotzi

Alternative Treatment of the Quark Mass in the Heavy Quark Expansion

Anastasia Boushmelev, Thomas Mannel, K. Keri Vos

NNLO QCD corrections to event shapes at the LHC

M. Alvarez, J. Cantero, M. Czakon, J. Llorente, A. Mitov, R. Poncelet

NNLO subtraction for any massless final state: a complete analytic expression

Gloria Bertolotti, Lorenzo Magnea, Giovanni Pelliccioli, Alessandro Ratti, Chiara Signorile-Signoril…

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