Annual Meeting of the SFB TRR 257

Oct 6, 2020, 11:00 AM → Oct 8, 2020, 6:00 PM Europe/Berlin

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

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

Final-Bulletin.pdf

Tuesday, October 6

11:30 AM → 11:40 AM Welcome: K. Melnikov (KIT), T. Mannel (Siegen)

Speakers: Kirill Melnikov (TTP KIT), Thomas Mannel (Siegen University)

Intro.pdf

11:40 AM → 12:30 PM Invited Talk: Gudrun Heinrich (KIT)

Speaker: Gudrun Heinrich (Max Planck Institute for Physics)

SFB_Higgs_Siegen.pdf

12:30 PM → 1:20 PM Invited Talk: Alexander Lenz Siegen)

Speaker: Alexander Lenz

Lenz_SFB_Siegen_2020_compressed.pdf

1:20 PM → 2:00 PM Buffet Lunch

2:00 PM → 2:30 PM Project A1a: R. Harlander (Aachen)

Speaker: Robert Harlander (RWTH Aachen University)

Harlander.pdf

2:30 PM → 3:00 PM Project A1b: K. Melnikov (KIT)

Speaker: Kirill Melnikov (TTP KIT)

ProjA1bSiegen.pdf

3:00 PM → 3:30 PM Project A1c: K. Melnikov (KIT)

Speaker: Kirill Melnikov (TTP KIT)

ProjA1cSiegen.pdf

3:30 PM → 4:00 PM Project B1a: M. Czakon (Aachen)

Speaker: Michal Czakon

talk.pdf

4:00 PM → 4:30 PM Coffee break

4:30 PM → 5:20 PM Invited talk: Jure Zupan (Cincinnati)

Speaker: Jure Zupan

CRC_Oct_2020_Zupan.pdf

5:20 PM → 5:50 PM Project B1b: M. Worek (Aachen)

Speaker: Malgorzata Worek (RWTH Aachen University)

SFB_MWorek.pdf

5:50 PM → 6:20 PM Project B1c: T. Jezo (KIT)

Speaker: Tomas Jezo (KIT ITP)

6:20 PM → 7:10 PM PI Meeting

Wednesday, October 7

8:30 AM → 9:20 AM Invited Talk: Claude Duhr (CERN)

Speaker: Claude Duhr

duhr.pdf

9:20 AM → 10:10 AM Invited talk: Julia Harz (TU München)

Speaker: Julia Harz

CRCSiegen2020.pdf

10:10 AM → 10:40 AM Coffee Break

10:40 AM → 11:10 AM Project B2a: G. Bell (Siegen)

Speaker: Guido Bell (University of Siegen)

SFB2020.pdf

11:10 AM → 1:00 PM Young Scientists Session: I

11:10 AM The full angle-dependence of the four-loop cusp anomalous dimension in QED

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)

Robin_Brueser_YSF.pdf

11:28 AM NLO QCD-EW corrections to Higgs boson gluon fusion

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)

20201003_CRC_Siegen.pdf

11:46 AM The Kinetic Heavy Quark Mass to Three Loop

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)

talk-schoenwald.pdf

12:04 PM On the status of the heavy quark expansion for charmed hadrons

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)

CRCcharmHQEV2.pdf

12:22 PM Automating the calculation of jet functions in SCET

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)

SFB_YSS_Brune.pdf

12:40 PM On inverse moment of B_s meson distribution amplitude

Speaker: Rusa Mandal

YSFSiegen_Rusa.pdf

1:00 PM → 1:45 PM Buffet Lunch

1:45 PM → 2:15 PM Project C1a: T. Huber (Siegen)

Speaker: Tobias Huber

C1aOct2020.pdf

2:15 PM → 2:45 PM Project C1b: U. Nierste (KIT)

Speaker: Ulrich Nierste (Institut fuer Theoretische Teilchenphysik, KIT CS)

nierste_c1b.pdf

2:45 PM → 3:15 PM Project A2a: T. Plehn (Heidelberg)

Speaker: Tilman Plehn

sfb_a2a_20.pdf

3:15 PM → 3:45 PM Project B3a: F. Kahlhöfer (Aachen)

Speaker: Felix Kahlhoefer

B3A.pdf

3:45 PM → 4:15 PM Project B1d: M. Löschner (KIT)

Speaker: Maximilian Löschner (KIT/ ITP)

Loeschner-SFB-TRR-257-Oct-2020.pdf

4:15 PM → 4:45 PM Project B2b: S. Bruggisser (Heidelberg)

Speaker: Sebastian Bruggisser (Heidelberg)

B2bBruggisserAllStagesOfBuilds.pdf

B2bBruggisserCompact.pdf

4:45 PM → 5:15 PM Coffee Break

5:15 PM → 5:55 PM Gender Awareness / Soft Skills

5:15 PM Implicit Bias: C. Schuster (DFG)

Speaker: Cosima Schuster

Präsentation_TRR257.pdf

Präsentation_TRR257.pptx

5:55 PM → 6:30 PM Young Scientists Session: II

5:55 PM Probing New Physics in b \to d Transitions

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)

SFB-meeting-2020-Rusov.pdf

6:13 PM Contribution of the Darwin operator to non-leptonic decays of heavy quarks

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

SFB_Meeting_2020.pdf

6:30 PM → 7:30 PM General Assembly

7:30 PM → 9:30 PM PI´s Dinner (Haus der Siegerländer Wirtschaft)

Thursday, October 8

8:30 AM → 9:00 AM Project C2a: T. Mannel (Siegen)

Speaker: Thomas Mannel (Siegen University)

c2a_2020.pdf

9:00 AM → 9:30 AM Project C2b: T. Feldmann (Siegen)

Speaker: Thorsten Feldmann

c2b_feldmann_2020.pdf

9:30 AM → 10:00 AM Project A3a: M. Mühlleitner (KIT)

Speaker: Milada Margarete Muhlleitner (KIT)

ProjectA3aSiegen2020.pdf

10:00 AM → 10:30 AM Coffee Break

10:30 AM → 11:00 AM Project A3b: M. Mühleitner (KIT) / M. Steinhauser (KIT)

Speakers: Milada Margarete Muhlleitner (KIT), Matthias Steinhauser

a3b.pdf

ProjectA3bSiegen2020.pdf

11:00 AM → 11:30 AM Project A2b: W. Kilian (Siegen) / H. Schäfer-Siebert (KIT)

Speakers: Heiko Schäfer-Siebert, Wolfgang Kilian

Siegen_A2b.pdf

11:30 AM → 1:00 PM Soft Skills Training

11:30 AM What kind of grants are available to young scientists? T. Mannel (Siegen)

Speaker: Thomas Mannel (Siegen University)

YSS.pdf

12:00 PM How to write a successful application: F. Kahlhoefer (Aachen)

Speaker: Felix Kahlhoefer

12:30 PM How are applications evaluated? M. Krämer (Aachen)

Speaker: Michael Krämer (RWTH Aachen University)

CRC_proposal_review.pdf

1:00 PM → 1:40 PM Buffet Lunch

1:40 PM → 2:10 PM Project C3a: M. Blanke (KIT)

Speaker: Monika Blanke (KIT)

2:10 PM → 2:40 PM Project C3b: R. Ziegler (KIT)

Speaker: Robert Ziegler

C3b_Ziegler.pdf

2:40 PM → 3:10 PM Coffee Break

3:10 PM → 4:00 PM Invited talk: (Fabio Maltoni)

Speaker: Fabio Maltoni

Siegen-maltoni.pdf

4:00 PM → 4:15 PM Closing Remarks