Portorož 2023: Particle Physics from Early Universe to Future Colliders

Session

Posters, wine and cheese

12 Apr 2023, 18:35

24. Rare $B_s \rightarrow l^+ l^-$ decays in a Two-Higgs-Doublet model of type III

Martin Sebastian Lang

12/04/2023, 18:35

Flavour

Poster

Leptonic decays of neutral B mesons provide an excellent probe of physics beyond the Standard Model, due to the absence of tree-level flavour-changing neutral currents in the Standard Model and the corresponding smallness of the branching ratio. We present a Two-Higgs-Doublet model in which flavour-changing neutral Higgs couplings to up-type quarks can lift part of the SM suppression. The...

4. Impact of $\Lambda_b\to \Lambda_c\tau\nu$ measurement on New Physics in $b\to c \, l \nu$ transitions

Marco Fedele (KIT)

12/04/2023, 18:40

Poster

Measurements of the branching ratios of $B \to D^{(*)}\tau\bar\nu/B \to D^{(*)}\ell\bar\nu$ and $B_c\to J/\psi\, \tau\bar\nu/B_c\to J/\psi\, \ell\bar\nu$ by the BaBar, Belle and LHCb collaborations consistently point towards an abundance of taus compared to channels with light leptons. However, the ratio $\Lambda_b \to\Lambda_c \tau\bar\nu/\Lambda_b \to\Lambda_c \ell\bar\nu$ shows a relative...

66. Analytic thin wall false vacuum decay rate

Marco Matteini (Jožef Stefan Institute)

12/04/2023, 18:45

Early Universe

Poster

We derive a closed-form false vacuum decay rate at one loop for a single real scalar field in the thin wall limit. We obtain the bounce solution, together with the Euclidean action, counter-terms and RG running, and we extract the functional determinant via the Gel’fand-Yaglom theorem. Our procedure is valid for a generic spacetime dimension D, and we provide an explicit finite renormalized...

67. Lattice QCD study of $Z_b$ and $Z_c$

Mr Mitja Sadl

12/04/2023, 18:50

Flavour

Poster

We present two lattice studies: The $\bar bb\bar qq$ systems with various quantum numbers using static bottom quarks and $\bar cc \bar qq$ systems with $I(J^{PC})=1(1^{+\pm})$.
Only one set of quantum numbers that couples to $Z_b$ and $\Upsilon\;\pi$ was explored on the lattice before; these studies found an attractive potential between $B$ and $\bar B^*$ resulting in a bound state below the...

18. Searching for Low-Mass Resonances Decaying into W Bosons

Guglielmo Coloretti (University of Zurich (UZH) / Paul Scherrer Institute (PSI))

Collider Physics and Machine Learning

Poster

In the light of the current hints for new scalars at the LHC at 95 GeV and 151 GeV, I present an analysis of low mass resonances decaying into W bosons. Recasting and combining the SM Higgs analyses of ATLAS and CMS, our results give further support to the existance of such new Higgs bosons.