Young Scientists Meeting of the CRC TRR 257

Session

Young Scientists Talks: Session 1

Jul 21, 2025, 2:20 PM

8. Three-loop QCD corrections to heavy-to-light form factors and applications to inclusive $B$ decays

Jakob Müller

7/21/25, 2:20 PM

In this talk, we discuss the computation of form factors for decays of heavy into light quarks at third order in QCD for various currents. We describe the different steps of the calculation and use the results to compute the hard matching coefficients in Soft-Collinear Effective Theory for all currents. Further, we extract the hard function in $\bar B \to X_s \gamma$ to three loops using the...

11. Explaining the γγ + X excesses at 152 GeV via the Drell-Yan production of a Higgs triplet

Saiyad Ashanujjaman (TTP & IAP, KIT)

7/21/25, 2:40 PM

The discovery of the 125 GeV Higgs boson marked the final piece of the Standard Model (SM), but no new particles have been observed since. However, multi-lepton anomalies at the LHC hint at a new scalar between 145–155 GeV, decaying mainly to WW, with no corresponding ZZ signal—suggesting a neutral $SU(2)_L$ triplet. Recasting ATLAS Run-2 di-photon data reveals a 4σ excess near 152 GeV and a...

14. The B^+ - B^0_d Lifetime Difference At NNLO

Francesco Moretti (TTP)

7/21/25, 3:00 PM

We study the QCD corrections to the spectator effects in the lifetimes of weakly decaying heavy hadrons containing a bottom quark in the framework of the Heavy Quark Expansion (HQE). These effects come from the contribution of dimension-6 four-quark effective operators which, despite being ${1\over m_b^3}$ suppressed, receive a phase-space enhancement. In our work, we neglect the light-quark...

20. A composite grandcolor axion from a composite Higgs model

Andrea Incrocci (KIT)

7/21/25, 3:20 PM

In this work we propose a unified model that simultaneously addresses the hierarchy problem and the strong CP problem by combining a composite Higgs scenario with an axion model. To do so, we construct a model in which both the Higgs and the axion arise as pseudo-Nambu-Goldstone bosons (pNGBs) from the same symmetry breaking. In particular, we work with an $SU(4)/Sp(4)$ composite Higgs model,...

29. A composite grandcolor axion from a composite Higgs model

Andrea Incrocci (KIT)

30. Explaining the γγ + X excesses at 152 GeV via the Drell-Yan production of a Higgs triplet

Saiyad Ashanujjaman (TTP & IAP, KIT)

28. The B^+ - B^0_d Lifetime Difference At NNLO

Francesco Moretti (TTP)

27. Three-loop QCD corrections to heavy-to-light form factors and applications to inclusive decays

Jakob Müller