Annual Meeting of the CRC TRR 257

Europe/Berlin Meeting ID: 924 0085 0622 Passcode: 810783
Michael Krämer (RWTH Aachen University)

The annual meeting of the CRC TRR 257 “Particle Physics Phenomenology after the Higgs Discovery'' will be held on May 26th-28th, 2021 

The meeting will be held as an online event. Connection details will be provided in due course. 

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  • Alan Price
  • Aleksey Rusov
  • Alessandro Morandini
  • Alexander Khodjamirian
  • Alexander Lenz
  • Alexander Mück
  • Alexei Pivovarov
  • Anja Butter
  • Arnd Behring
  • Björn O. Lange
  • Chen-Yu Wang
  • Chiara Signorile-Signorile
  • Christian Broennum-Hansen
  • Colomba Brancaccio
  • Daniel Moreno
  • Daniel Stremmer
  • Dennis Horstmann
  • Dieter Zeppenfeld
  • Elias Bernreuther
  • Emilio Villa
  • Emma Geoffray
  • Fabian Lange
  • Felix Egle
  • Felix Kahlhoefer
  • Gilberto Tetlalmatzi-Xolocotzi
  • Goutam Das
  • Gudrun Heinrich
  • Guido Bell
  • Hua-Yu Jiang
  • Huan-Yu Bi
  • Ilaria Brivio
  • Ivan Oleksiyuk
  • Jan Heisig
  • Jan Piclum
  • Jannis Lang
  • Jasmina Nasufi
  • Jeremie Quarroz
  • Jonas Mueller
  • Jonathan Hermann
  • Jure Zupan
  • Kay Schoenwald
  • Kevin Brune
  • Kevin Olschewsky
  • Kirill Melnikov
  • Lara Grabitz
  • Lars-Thorben Moos
  • Lisa Biermann
  • Long Chen
  • Lorenz Vogel
  • Lucas Kunz
  • Lukas Simon
  • Magnus Schaaf
  • Malgorzata Worek
  • Marcel Wald
  • Marco Bonetti
  • Marco Fedele
  • Marco Niggetiedt
  • Maria Laura Piscopo
  • Martin Lang
  • Marvin Gerlach
  • Matteo Fael
  • Matthew Black
  • Matthias Linster
  • Matthias Steinhauser
  • Maximilian Delto
  • Maximilian Löschner
  • Michael Krämer
  • Michal Czakon
  • Michelangelo Mangano
  • Michele Lupattelli
  • Milada Margarete Mühlleitner
  • Minos Reinartz
  • Muslem Rahimi
  • Nico Gubernari
  • Nils Kreher
  • Oliver Witzel
  • Oscar Cata
  • Philipp Müllender
  • Ramon Winterhalder
  • Robert Harlander
  • Robert Ziegler
  • Robin Brüser
  • Rusa Mandal
  • Ruth Schäfer
  • Sander Hummerich
  • Sebastian Bruggisser
  • Seraina Glaus
  • Stefan Gieseke
  • Susanne Westhoff
  • Tanmoy Modak
  • Terry Generet
  • Thanh Tien Dat Nguyen
  • Theo Heimel
  • Thomas Mannel
  • Thorsten Feldmann
  • Tim Kempkens
  • Tobias Huber
  • Tobias Striegl
  • Tomas Jezo
  • Vladyslav Shtabovenko
  • Wojciech Bizon
  • Wolfgang Kilian
  • Yao Ji
    • 13:00 13:30
      Welcome 30m
      Speakers: Kirill Melnikov (TTP KIT), Michael Krämer (RWTH Aachen University)
    • 13:30 15:30
      CRC reports: Flavour
      Convener: Alexander Lenz (Siegen University)
      • 13:30
        Project reports: SM flavour physics 1h
        Speaker: Tobias Huber (Siegen U)
      • 14:30
        Project reports: BSM flavour physics 1h
        Speaker: Ulrich Nierste (Institut fuer Theoretische Teilchenphysik, KIT CS)
    • 15:30 16:00
      Coffee break 30m
    • 16:00 17:00
      Invited talks: Effective field theories
      Convener: Kirill Melnikov (TTP KIT)
      • 16:00
        Effective field theories 1h
        Speaker: Matthias Neubert (Johannes Gutenberg-Universität Mainz)
    • 17:00 18:00
      Young Scientists Forum: Part 1
      Conveners: Elias Bernreuther (RWTH Aachen University), Martin Gabelmann (KIT), Oscar Cata
      • 17:00
        NLO QCD corrections for off-shell ttbb 20m

        I will present next-to-leading order QCD predictions for the process of top quark pair production in association with a b-jet pair at the LHC with center of mass energy of 13 TeV. In the calculation we concentrated on the di-leptonic decay channel of the top quark pair and we considered full off-shell effects. This study is particularly relevant for the measurements of the Higgs properties, because it represents a background to the Higgs production in association with a top quark pair. In addition, our predictions might be used for precise measurements of the top quark fiducial cross sections and to improve top quark decay modeling at the LHC.

        Speaker: Michele Lupattelli (Aachen)
      • 17:20
        ttW: Correlations and Asymmetries 20m

        The ttW^{+/-} process in the multi-lepton plus b-jet final state has shown discrepancies between experiment and theory as reported by the ATLAS collaboration. To this end, we employ NLO QCD off-shell results for this process to investigate the cross section ratio between ttW^+ and ttW^- which is a precision observable. Using these results we obtain theoretical errors of order 1%-2%, depending of the transverse momentum cut on the b-jet. Furthermore, motivated by this discrepancy we analyse the charge asymmetry of the top quark and it's decay products for this process. These are quite sensitive to the chiral nature of possible new physics in this channel. The theoretical uncertainty, modelling and reconstruction issues are addressed and discussed and finally we reach theoretical uncertainties of below 15% for this observable.

        Speaker: Jasmina Nasufi (Aachen)
      • 17:40
        NNLO QCD corrections to the B-meson mixing 20m

        In this talk I will discuss selected aspects of our calculation of the previously unknown NNLO QCD corrections to the $B_s - \bar{B}_s$ mixing process. These contributions are required to reduce the existing theory uncertainty on $\Delta \Gamma_{12}^s$, the flavor mixing parameter governing lifetime differences of neutral $B_s$ mesons.

        Speaker: Vladyslav Shtabovenko (Karlsruhe)
    • 18:00 19:00
      Meeting of the principal investigators 1h
      Speaker: Kirill Melnikov (TTP KIT)
    • 18:00 19:00
      Meeting of the young scientists 1h
      Speakers: Elias Bernreuther (RWTH Aachen University), Martin Gabelmann (KIT), Oscar Cata
    • 09:00 11:00
      CRC reports: BSM physics and methods/tools for precision calculations
      Convener: Michal Czakon (RWTH Aachen University)
      • 09:00
        Project reports: BSM and dark matter at colliders 1h
        Speaker: Tilman Plehn (Heidelberg University)
      • 10:00
        Project reports: Tools and methods for precision physics 1h
        Speaker: Kirill Melnikov (TTP KIT)
    • 11:00 11:30
      Coffee break 30m
    • 11:30 12:30
      Invited talks: Physics at future colliders
      Convener: Dieter Zeppenfeld (KIT)
      • 11:30
        Physics at future colliders 1h
        Speaker: Michelangelo Mangano (CERN)
    • 12:30 14:00
      Lunch break 1h 30m
    • 14:00 15:20
      Young Scientists Forum: Part 2
      Conveners: Elias Bernreuther (RWTH Aachen University), Martin Gabelmann (KIT), Oscar Cata
      • 14:00
        Cornering the Two-Higgs-Doublet II Model 20m

        We perform a comprehensive study of the allowed parameter space of the Two-Higgs doublet model (2HDM) of type II. Using the theoretical framework flavio, we combine the most recent flavour, collider and electro-weak precision observables with theoretical constraints to obtain bounds on the mass spectrum of the theory. In particular we find that the wrong-sign limit is excluded and potential deviations from the alignment limit can only be small. Finally we test the consequences of our allowed parameter space on electro-weak baryo genesis via the programme package BSMPT.

        Speaker: Matthew Black (Siegen)
      • 14:20
        Top-quark fragmentation into a Higgs boson with next-to-leading order accuracy 20m

        We computed the tth fragmentation function at order O(yt2 αs). Real and virtual corrections have been computed by using modern loop computation techniques. In particular, we combined the unitary cut method with the differential equation approach. Moreover, we found a strategy for calculating the master integrals analytically, order by order in the dimensional regulator ε, in canonical basis.

        Speaker: Colomba Brancaccio (Aachen)
      • 14:40
        Top-Pair Events with B-hadrons at the LHC 20m

        In this talk, I will present NNLO QCD predictions for several differential distributions of B-hadrons in top-pair events at the LHC. Among other things, these predictions allow for a precise determination of the top-quark mass. The results also offer positive prospects for extracting heavy-flavour fragmentation functions from LHC data. On the technical side, I will demonstrate how to incorporate fragmentation in a subtraction scheme at NNLO.

        Speaker: Terry Generet (Aachen)
      • 15:00
        (g-2)𝜇, B anomalies and DM: a loop model tale 20m

        In this talk I will review how the anomalous magnetic moment of the muon and the B anomalies can be addressed by a combined explaination, by means of loop models characterized by minimal field content. Moreover, I will show how some of these model can also provide a viable DM candidate, accounting for the measured relic density while evading direct and indirect DM constraints.

        Speaker: Marco Fedele (Karlsruhe)
    • 15:20 16:00
      Coffee break 40m
    • 16:00 17:00
      General assembly 1h
      Speaker: Kirill Melnikov (TTP KIT)
    • 09:00 11:00
      CRC reports: Higgs and collider physics
      Convener: Gudrun Heinrich (Max Planck Institute for Physics)
      • 09:00
        Project reports: Collider phenomenology 1h
        Speaker: Malgorzata Worek (RWTH Aachen University)
      • 10:00
        Project reports: Precision Higgs physics 1h
        Speaker: Robert Harlander (RWTH Aachen University)
    • 11:00 11:30
      Coffee break 30m
    • 11:30 12:30
      Invited talks: Cosmology and particle physics
      Convener: Michael Krämer (RWTH Aachen University)
      • 11:30
        Cosmology and Particle Physics 1h
        Speaker: Geraldine Servant (DESY)
    • 12:30 14:00
      Lunch break 1h 30m
    • 14:00 15:00
      Young Scientists Forum: Part 3
      Conveners: Elias Bernreuther (RWTH Aachen University), Martin Gabelmann (KIT), Oscar Cata
      • 14:00
        Exact top-quark mass dependence in hadronic Higgs production 20m

        The impact of the finite top-quark mass on the inclusive Higgs production cross section at higher perturbative orders has been an open question for almost three decades. I will report on the computation of this effect at NNLO QCD. This result eliminates one of the main theoretical uncertainties to inclusive Higgs production cross section at the LHC.

        Speaker: Marco Niggetiedt (Aachen)
      • 14:20
        Third order corrections to the semi-leptonic $b\to c$ and the muon decays 20m

        In this talk we present our recent calculation of order $\alpha_s^3$ corrections to the semi-leptonic $b\to c$ and the muon decays. The calculation has been performed in an expansion around the heavy-daughter limit $m_c \sim m_b$, but also shows decent convergence for $m_c=0$ from which the contribution to the muon decay can be extracted.

        Speaker: Kay Schoenwald (Karlsruhe)
      • 14:40
        Automated calculation of beam functions in SCET 20m

        Over the last decades, factorization theorems became an important method to tackle problems in perturbative QCD, especially within the framework of effective field theories. In Soft-Collinear Effective Theory, these factorization theorems include beam functions accounting for the initial-state collinear interactions. While these functions have been calculated case by case for different observables until now, we are investigating an automated approach for a general class of observables. For this, we study a general phase-space parameterization which factorizes the singularities of the beam function in an universal way. This approach has been implemented in the public code "pySecDec" in order to calculate the next-to-leading order and part of the next-to-next-to leading order beam function.

        Speaker: Marcel Wald (Siegen)
    • 15:00 16:00
      Invited talks: Implicit bias in physics
      Convener: Thomas Mannel (Siegen University)
      • 15:00
        Implicit bias in physics 1h
        Speaker: Marika Taylor (University of Southampton)
    • 16:00 16:30
      Concluding remarks 30m
      Speaker: Kirill Melnikov (TTP KIT)
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