Annual Meeting of the SFB TRR 257

University of Siegen
Jan Piclum (University of Siegen), Thomas Mannel (Siegen University)

October 6th-8th, 2020 

Information on Hotel accommodation and Conference venue in the attached final bulletin


Siegen, Spandauersaal (Eingang B), Koblenzer-Str. 151

  • Aleksey Rusov
  • Alexander Khodjamirian
  • Alexander Lenz
  • Alexander Mück
  • Alexei Pivovarov
  • Anja Butter
  • Arnd Behring
  • Benjamin Summ
  • Bjorn O. Lange
  • Chen-Yu Wang
  • Colomba Brancaccio
  • Daniel Baranowski
  • Daniel Moreno Torres
  • Dat Nguyen Thanh Tien
  • Dieter Zeppenfeld
  • Elias Bernreuther
  • Emilio Villa
  • Emma Geoffray
  • Emma Simpson Dore
  • Fabian Lange
  • Fabio Maltoni
  • Florian Herren
  • Gilberto Tetlalmatzi-Xolocotzi
  • Goutam Das
  • Gudrun Heinrich
  • Guido Bell
  • Hanna Mies
  • Harun Acaroglu
  • Heiko Schäfer-Siebert
  • Hua-Yu Jiang
  • Huan-Yu Bi
  • Ilaria Brivio
  • Jan Piclum
  • Jannis Lang
  • Jasmina Nasufi
  • Jeremie Quarroz
  • Jonas Mueller
  • Jonathan Hermann
  • Joshua Davies
  • Joshua Schophoven
  • Jure Zupan
  • Kay Schönwald
  • Kevin Brune
  • Kevin Olschewsky
  • Kirill Melnikov
  • kodai Sakurai
  • Lars-Thorben Moos
  • Long Chen
  • Lukas Simon
  • Magnus Schaaf
  • Malgorzata Worek
  • Marcel Wald
  • Marco Bonetti
  • Marco Niggetiedt
  • Margarete Mühlleitner
  • Maria Laura Piscopo
  • Martin Gabelmann
  • Martin Lang
  • Marvin Gerlach
  • Matteo Fael
  • Matthias Linster
  • Matthias Steinhauser
  • Max Delto
  • Maximilian Löschner
  • Michael Krämer
  • Michal Czakon
  • Michele Lupattelli
  • Monika Blanke
  • Muslem Rahimi
  • Mussa Rajamov
  • Mustafa Tabet
  • Nicolas Seitz
  • Nils Kreher
  • Oscar Cata
  • Philipp Müllender
  • Ramon Winterhalder
  • Robert Harlander
  • Robert Ziegler
  • Robin Brüser
  • Rusa Mandal
  • Ruth Schaefer
  • Sebastian Bruggisser
  • Seraina Glaus
  • Sophie Williamson
  • Stefan Gieseke
  • Susanne Westhoff
  • Terry Generet
  • Thomas Mannel
  • Thorben Finke
  • Thorsten Feldmann
  • Tobias Huber
  • Tobias Mohrmann
  • Tobias Striegl
  • Tomas Jezo
  • Ulrich Nierste
  • Vladyslav Shtabovenko
  • Wojciech Bizon
  • Wolfgang Kilian
  • Yao Ji
    • 11:30 11:40
      Welcome: K. Melnikov (KIT), T. Mannel (Siegen) 10m
      Speakers: Kirill Melnikov (TTP KIT), Thomas Mannel (Siegen University)
    • 11:40 12:30
      Invited Talk: Gudrun Heinrich (KIT) 50m
      Speaker: Gudrun Heinrich (Max Planck Institute for Physics)
    • 12:30 13:20
      Invited Talk: Alexander Lenz Siegen) 50m
      Speaker: Alexander Lenz
    • 13:20 14:00
      Buffet Lunch 40m
    • 14:00 14:30
      Project A1a: R. Harlander (Aachen) 30m
      Speaker: Robert Harlander (RWTH Aachen University)
    • 14:30 15:00
      Project A1b: K. Melnikov (KIT) 30m
      Speaker: Kirill Melnikov (TTP KIT)
    • 15:00 15:30
      Project A1c: K. Melnikov (KIT) 30m
      Speaker: Kirill Melnikov (TTP KIT)
    • 15:30 16:00
      Project B1a: M. Czakon (Aachen) 30m
      Speaker: Michal Czakon
    • 16:00 16:30
      Coffee break 30m
    • 16:30 17:20
      Invited talk: Jure Zupan (Cincinnati) 50m
      Speaker: Jure Zupan
    • 17:20 17:50
      Project B1b: M. Worek (Aachen) 30m
      Speaker: Malgorzata Worek (RWTH Aachen University)
    • 17:50 18:20
      Project B1c: T. Jezo (KIT) 30m
      Speaker: Tomas Jezo (KIT ITP)
    • 18:20 19:10
      PI Meeting 50m
    • 08:30 09:20
      Invited Talk: Claude Duhr (CERN) 50m
      Speaker: Claude Duhr
    • 09:20 10:10
      Invited talk: Julia Harz (TU München) 50m
      Speaker: Julia Harz
    • 10:10 10:40
      Coffee Break 30m
    • 10:40 11:10
      Project B2a: G. Bell (Siegen) 30m
      Speaker: Guido Bell (University of Siegen)
    • 11:10 13:00
      Young Scientists Session: I
      • 11:10
        The full angle-dependence of the four-loop cusp anomalous dimension in QED 18m

        The cusp anomalous dimension is a ubiquitous quantity in gauge theories such as QCD and QED. It governs the infrared behaviour of scattering amplitudes and is a universal ingredient in heavy quark effective theory and soft collinear effective theory. In this talk I present new results for the full angle-dependence of the fermionic quartic Casimir contributions at four loops. These are the first truly non-planar matter dependent contributions and the last missing pieces to obtain the full cusp anomalous dimension in QED.

        Speaker: Robin Brüser (University Siegen)
      • 11:28
        NLO QCD-EW corrections to Higgs boson gluon fusion 18m

        The study of the Higgs boson properties is one of the main
        tasks of contemporary high-energy physics. Among Higgs properties, its interaction with gluons is interesting since it can be facilitated by yet unknown elementary particles. At present, one of the major sources of uncertainty in the theoretical description of ggH coupling originates from mixed QCD-electroweak contributions. I will present the analytic results for the NLO mixed QCD-EW corrections to gg→H(g).

        Speaker: Marco Bonetti (RWTH)
      • 11:46
        The Kinetic Heavy Quark Mass to Three Loop 18m

        We compute three-loop corrections to the relation between the heavy quark masses defined in the pole and kinetic schemes. Using known relations between the pole and $\overline{\rm MS}$ quark masses we can establish precise relations between the kinetic and $\overline{\rm MS}$
        charm and bottom masses. As compared to two loops, the precision is improved by a factor two to three. Our results constitute important ingredients for the precise determination of the Cabibbo-Kobayashi-Maskawa matrix element $V_{cb}$ at Belle~II.

        Speaker: Kay Schoenwald (KIT)
      • 12:04
        On the status of the heavy quark expansion for charmed hadrons 18m

        The heavy quark expansion (HQE), which provides a perturbative expansion in the inverse heavy quark mass, has proven to be very successful for describing bottomed hadrons. However, its applicability has often been questioned for charmed hadrons due to the charm quark is actually not so heavy. In this talk we revisit the status of the HQE for charm. In particular, we study pseudoscalar $D$-meson semileptonic and nonleptonic decay widths including available NLO QCD and subleading $1/m_c$ corrections. We find good agreement with experimental data up to large uncertainties due to hadronic matrix elements and the charm quark mass definition. We also study the behavior of the HQE for observables specially designed for charm, where the free quark decay contribution cancels to a large extent.

        Speaker: Daniel Moreno (University of Siegen)
      • 12:22
        Automating the calculation of jet functions in SCET 18m

        In pertubative QCD large logarithms can arise in the computation of collider observables. These logarithms can be resummed via factorization theorems within Soft-Collinear Effective Theory(SCET). The
        factorization theorems contain jet functions, which describe collinear interactions.
        In this talk I present a systematic framework for the computation of jet functions for generic observables. For this purpose we introduce a phase space parametrization which allows the factorization of universal singularities of jet functions. We have implemented this framework for different observables, by using the public code "pySecDec" to compute the next-to-leading order and part of the next-to-next-to-leading order jet function.

        Speaker: Kevin Brune (University of Siegen)
      • 12:40
        On inverse moment of B_s meson distribution amplitude 18m
        Speaker: Rusa Mandal
    • 13:00 13:45
      Buffet Lunch 45m
    • 13:45 14:15
      Project C1a: T. Huber (Siegen) 30m
      Speaker: Tobias Huber
    • 14:15 14:45
      Project C1b: U. Nierste (KIT) 30m
      Speaker: Ulrich Nierste (Institut fuer Theoretische Teilchenphysik, KIT CS)
    • 14:45 15:15
      Project A2a: T. Plehn (Heidelberg) 30m
      Speaker: Tilman Plehn
    • 15:15 15:45
      Project B3a: F. Kahlhöfer (Aachen) 30m
      Speaker: Felix Kahlhoefer
    • 15:45 16:15
      Project B1d: M. Löschner (KIT) 30m
      Speaker: Maximilian Löschner (KIT/ ITP)
    • 16:15 16:45
      Project B2b: S. Bruggisser (Heidelberg) 30m
      Speaker: Sebastian Bruggisser (Heidelberg)
    • 16:45 17:15
      Coffee Break 30m
    • 17:15 17:55
      Gender Awareness / Soft Skills
    • 17:55 18:30
      Young Scientists Session: II
      • 17:55
        Probing New Physics in b \to d Transitions 18m

        Recent experimental data on several observables in semileptonic $B$-meson decays are found to be in tension with the corresponding Standard Model predictions. Most of these deviations are related to $b \to c$ and $b \to s$ flavour changing transitions. In this talk, I plan to discuss possible New Physics effects in $b \to d \mu^+ \mu^-$ flavour changing neutral currents.
        These NP contributions are parameterised in a model independent way and the $1 \sigma$ ranges of corresponding Wilson coefficients are determined from the data on the exclusive $B^\pm \to \pi^\pm \mu^+ \mu^-$ decays measured recently by the LHCb collaboration.
        Afterwards, I will briefly discuss the impact of these results on other $b \to d$ processes such as the leptonic $B^0 \to \mu^+ \mu^-$ decays and $B^0 - \bar B^0$ mixing.
        As an example, I will consider a simplified $Z^\prime$ model that is found to be consistent with the current $b \to d$ data in the certain regions of the NP parameters space.
        In the final part of the talk, I will briefly mention other $b \to d \ell^+ \ell^-$ modes to be measured in the future

        Speaker: Aleksey Rusov (University of Siegen)
      • 18:13
        Contribution of the Darwin operator to non-leptonic decays of heavy quarks 17m

        The total decay width of heavy hadrons can be systematically computed using the Heavy Quark Expansion (HQE) framework, as a series in inverse powers of the heavy quark mass m_Q. Computation of higher corrections is crucial both to test the consistency of HQE itself and to constrain the size of possible new physics effects. In this talk I will present the result of our recent paper on the determination of the two-loop 1/m_b^3 correction (Darwin term) to the non-leptonic decays of B mesons.

        Speaker: Maria Piscopo
    • 18:30 19:30
      General Assembly 1h
    • 19:30 21:30
      PI´s Dinner (Haus der Siegerländer Wirtschaft) 2h
    • 08:30 09:00
      Project C2a: T. Mannel (Siegen) 30m
      Speaker: Thomas Mannel (Siegen University)
    • 09:00 09:30
      Project C2b: T. Feldmann (Siegen) 30m
      Speaker: Thorsten Feldmann
    • 09:30 10:00
      Project A3a: M. Mühlleitner (KIT) 30m
      Speaker: Milada Margarete Muhlleitner (KIT)
    • 10:00 10:30
      Coffee Break 30m
    • 10:30 11:00
      Project A3b: M. Mühleitner (KIT) / M. Steinhauser (KIT) 30m
      Speakers: Milada Margarete Muhlleitner (KIT), Matthias Steinhauser
    • 11:00 11:30
      Project A2b: W. Kilian (Siegen) / H. Schäfer-Siebert (KIT) 30m
      Speakers: Heiko Schäfer-Siebert, Wolfgang Kilian
    • 11:30 13:00
      Soft Skills Training
      • 11:30
        What kind of grants are available to young scientists? T. Mannel (Siegen) 30m
        Speaker: Thomas Mannel (Siegen University)
      • 12:00
        How to write a successful application: F. Kahlhoefer (Aachen) 30m
        Speaker: Felix Kahlhoefer
      • 12:30
        How are applications evaluated? M. Krämer (Aachen) 30m
        Speaker: Michael Krämer (RWTH Aachen University)
    • 13:00 13:40
      Buffet Lunch 40m
    • 13:40 14:10
      Project C3a: M. Blanke (KIT) 30m
      Speaker: Monika Blanke (KIT)
    • 14:10 14:40
      Project C3b: R. Ziegler (KIT) 30m
      Speaker: Robert Ziegler
    • 14:40 15:10
      Coffee Break 30m
    • 15:10 16:00
      Invited talk: (Fabio Maltoni) 50m
      Speaker: Fabio Maltoni
    • 16:00 16:15
      Closing Remarks 15m
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