# Contact

Spokesperson:
Prof. Kirill Melnikov
Karlsruhe Institute of Technology
kirill.melnikov@kit.edu

Deputy spokesperson:
Prof. Michael Krämer
RWTH Aachen University
mkraemer@physik.rwth-aachen.de

Deputy spokesperson:
Prof. Th. Mannel
University of Siegen
mannel@physik.uni-siegen.de

Equal Opportunity Officer:
Dr. habil. Malgorzata Worek
RWTH Aachen University
worek@physik.rwth-aachen.de

Zahra Donyai
Karlsruhe Institute of Technology
trr257@particle.kit.edu
Working Hours: Mon - Tue 9:30-15:30 and Wen 9:30-12:30

# Open positions

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

# 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 recent discovery of the Higgs boson 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 phenomenology of elementary particles focusing, in particular, on the physics of Higgs boson, physics of top quarks, electroweak gauge bosons and jets and flavour physics. Our goal is to develop the necessary methodologies to search for physics beyond the Standard Model through precise measurements at the LHC, flavour factories and elsewhere.

# News

08.10.2020 - The Annual meeting of the Collaborative Research Center took place in Siegen from Oct. 6th to Oct. 8th. The meeting was held in a hybrid (live and zoom) format. Presentations are available online.

03.07.2020 - We would like to welcome Gudrun Heinrich (KIT) and Alexander Lenz (Siegen) as two new principal investigators of the CRC. Within the CRC, Gudrun will develop numerical methods for computing two-loop amplitudes with many mass scales and Alexander will study possible ways to constrain non-perturbative parameters that appear within the heavy quark expansion.

30.06.2020 - We have recently started the new series of talks – the CRC colloquium. The idea is to have CRC PIs talk about their current research. The first talk of the series on “How to GAN” was given by Tilman Plehn (Heidelberg) on June 30th. The second talk on “Precision Flavor physics” will be given by Tobias Huber (Siegen) on July 13th.

08.06.2020 - We are happy to announce the First Young Scientists Forum of the SFB TRR 257 which will take place on June 09th, June 17th and June 23rd from 2pm - 4:30pm. The Young Scientists Forum is a series of remote seminars given by Ph.D. students and young Postocs from Aachen, Heidelberg, Karlsruhe and Siegen. It features short (12+3 minutes) presentations. The purpose of the event is to train the speakers to talk about their research in front of a large audience and to strengthen scientific collaborations during the corona lock-down.

# Recent Seminars

The art of combining matrix elements and QCD parton showers

Steffen Schumann (Universität Göttingen), 23.06.2020, Aachen

Melissa Beekveld (Nikhef / Radboud University Nijmegen), 09.06.2020, Aachen

Scattering amplitudes on a periodic lattice

Maxwell Hansen, 16.07.2020, Karlsruhe

Sphalerons at the LHC and beyond

Kazuki Sakurai, 09.07.2020, Karlsruhe

Flavor Phenomenology of the QCD Axion

Robert Ziegler(KIT), 08.07.2020, Siegen

Prospects and implications of b->sll : Baryons and neutrinos

Martín Novoa Brunet(IJCLab), 29.06.2020, Siegen

Exploring the infrared structure of perturbative QCD

Lorenzo Magnea, 23.07.2020, Karlsruhe

CP violation in charm

Yuval Grossman, 12.11.2020, Karlsruhe

Connections between gravity and scattering amplitudes

Poul Hendrik Damgaard, 14.01.2021, Karlsruhe

New lattice calculations for hadronic contributions to g-2

Christoph Lehner, 26.11.2020, Karlsruhe

Mathematical developments for higher-order calculations

Pierpaolo Mastrolia, 03.12.2020, Karlsruhe

Unfolding with respect to ttbar cross-sections

Olaf Behnke (DESY), 09.02.2021, Aachen

Soft-collinear effective theory

Thomas Becher (University of Bern), 02.02.2021, Aachen

Usage of Machine Learning in Dark Matter searches

Christoph Weniger (University of Amsterdam), 01.12.2020, Aachen

Higgs pair production status at LHC (Run II)

Peter Fackeldey (RWTH), 21.01.2020, Aachen

Charming CP Violation

Yuval Grossman, 12.11.2020, Karlsruhe

News from KATRIN

Kathrin Valerius, 11.02.2021, Karlsruhe

Absence of CP violation from strong interactions in fermion correlations

Björn Garbrecht(Tech. U. Munich), 02.11.2020, Siegen

Neutrino Physics

Gabriela Barenboim, 21.01.2021, Karlsruhe

Precision SM Predictions for Flavour Observables

Aleksey Rusov(Siegen U.), 09.11.2020, Siegen

The Hidden Geometry of Particle Collisions

Jesse Thaler, 19.11.2020, Karlsruhe

Hadronic contributions to the muon anomalous magnetic moment from lattice gauge theory

Christoph Lehner, 26.11.2020, Karlsruhe

Baryogenesis and Dark Matter from B Mesons

Miguel Escudero(Tech. U. Munich), 23.11.2020, Siegen

Fundamental Interactions and Intersections

Pierpaolo Mastrolia, 03.12.2020, Karlsruhe

State-of-the-art of Higgs-CP measurements at the LHC

Mereijn van de Klundert, 10.12.2020, Karlsruhe

# Recent Publications

NLO QCD corrections to off-shell $\boldsymbol{t\bar{t}W^\pm}$ production at the LHC: Correlations and Asymmetries

Giuseppe Bevilacqua, Huan-Yu Bi, Heribertus Bayu Hartanto, Manfred Kraus, Jasmina Nasufi, Malgorzata Worek

Third order corrections to the semi-leptonic \boldmath{$b\to c$} and the muon decays

Matteo Fael, Kay Schönwald, Matthias Steinhauser

Non-local matrix elements in $B_{(s)}\to \{K^{(*)},\phi\}\ell^+\ell^-$

Nico Gubernari, Danny van Dyk, Javier Virto

Collider constraints on dark mediators

Hanna Mies, Christiane Scherb, Pedro Schwaller

ZH production in gluon fusion: two-loop amplitudes with full top quark mass dependence

L. Chen, G. Heinrich, S.P. Jones, M. Kerner, J. Klappert, J. Schlenk

Virtual corrections to $gg\to ZH$ in the high-energy and large-$m_t$ limits

Joshua Davies, Go Mishima, Matthias Steinhauser

view all publications