Portorož 2025: Particle Physics from Early Universe to Future Colliders

Session

Wine & cheese poster session

23 Apr 2025, 18:30

8. Neutrino Masses and Nucleon Decay as Probes of Standard Model Linear Extensions

Mr Arnau Bas i Beneito (Institut de Física Corpuscular (IFIC, UV))

23/04/2025, 18:30

Poster

Baryon and lepton number are excellent low-energy symmetries of the Standard Model (SM) that tightly constrain the form of its extensions. In this work, we investigate the possibility that these accidental symmetries are violated in the deep UV, in such a way that one multiple necessary for their violation lives at an intermediate energy M above the electroweak scale. We write down the...

42. Nonlocal condensate contributions to $D$-meson mixing

Lovro Dulibić (Ruđer Bošković Institute)

23/04/2025, 18:35

Poster

A longstanding mismatch of the theoretical predictions and experimental measurements of $D$-meson mixing parameters stands at a couple orders of magnitude. The Glashow–Iliopoulos–Maiani (GIM) mechanism is responsible for the cancellations which leave $SU(3)$ breaking effects highly suppressed - to the fourth power. Higher order corrections, as well as nonperturbative effects, may give rise to...

61. Stabilising the FxFx algorithm in the MadGraph event generator for the usage at the LHC

Lenart Jerala (Jozef Stefan Institute (SI))

23/04/2025, 18:40

Poster

In this poster, we present an in-depth investigation of the recently found issues in the FxFx matching-merging procedure in MadGraph5_aMC@NLO for usage at the LHC. We compare the predictions for $W+3$ jets and $Z+3$ jets against corresponding measurements from ATLAS and CMS, studying a variety of final-state kinematic distributions and highlighting regions where mismatches are most pronounced....

67. PT2GWFinder: A Package for Cosmological First Order Phase Transitions and Gravitational Waves

Marco Matteini (Jožef Stefan Institute)

23/04/2025, 18:45

Poster

The study of cosmological first order phase transitions, and the associated gravitational wave signal, has seen growing interest in recent years, driven by the prospects of detection with next-generation ground- and space-based interferometers.
Here, I present PT2GWFinder, a Mathematica package designed to compute phase transition parameters and the gravitational wave power spectrum for an...

68. Minimal scalar leptoquark model for RD(*)

Lovre Pavicic

23/04/2025, 18:50

Poster

Motivated by the long-standing discrepancy in lepton flavor universality ratios $R_D$ and $R_{D^{\ast}}$ we assess the status of scalar leptoquark states $R_2$, $\widetilde R_2$ and $S_1$ which can in principle provide a desired enhancement of $\mathcal{B}(B\to D^{(\ast )}\tau \nu)$ in a minimal setup with two Yukawa couplings only. We consider unavoidable low-energy constraints, $Z$-pole...

69. Functional determinants and lifetime of the Standard Model

Katarina Trailović (Institute Jožef Stefan)

23/04/2025, 18:55

Poster

We revisit the computation of the electroweak vacuum decay rate in the Standard Model, incorporating the full one-loop prefactor and focusing on the gauge degrees of freedom. Using group theoretical arguments, we derive the correct degeneracy factors in the functional determinant and identify an overcounting of transverse modes in previous calculations. The new result modifies the gauge...

74. Lifetimes of doubly charmed baryons

Lovro Dulibić (Ruđer Bošković Institute)

23/04/2025, 19:00

Poster

We present a theoretical background of heavy hadron decays within the heavy quark expansion and phenomenological implications to lifetimes of doubly charmed baryons by including available NLO QCD corrections and newly computed terms in the 1/m_c series. Heavy hadron decays are treated using the effective weak hamiltonian and perturbative and nonperturbative effects are decoupled into effective...

70. Inclusive charm reconstruction using Full Event Interpretation at Belle II

Kristof Spenko (Jozef Stefan Institute (SI))

23/04/2025, 19:05

Poster

Presentation of a newly develop tool for the purposes of inclusive reconstruction of charmed hadrons at the Belle II experiment and its potential use in future measurements.

71. False Vacuum Decay Rate of a Scalar Field at One Loop

Nikiša Plešec (Jožef Stefan Institute)

23/04/2025, 19:10

Poster

We investigate the false vacuum decay rate of a real scalar field theory in 2, 3, and 4 spacetime dimensions, incorporating quantum corrections at the one-loop level. This process, crucial for understanding phenomena such as metastable states in quantum field theory, phase transitions in the early universe, and critical behavior in condensed matter systems, is typically described using...

73. Doubly charmed tetraquark $T_{cc}^{+}$ ($cc \bar{u} \bar{d}$) from lattice QCD

Ivan Vujmilović (Jozef Stefan Institute)

23/04/2025, 19:15

Poster

The determination of the $DD^{*}$ scattering amplitude from lattice QCD is complicated by long-range interactions. In particular, the scattering amplitude exhibits a left-hand branch cut in the kinematical region where several states from lattice simulations appear, requiring careful treatment. We tackle this problem by adopting plane-wave and effective-field-theoretic methods, which also...

75. $\rho$ meson spectroscopy using Lattice QCD

Luka Jevšenak (University of Ljubljana)

23/04/2025, 19:20

Poster

Using Lattice QCD, we performed spectroscopy of the $\rho$ meson on a
C13 gauge ensemble, with pion mass $m_\pi = 317\ \text{MeV}$ and lattice
spacing $a = 0.114\ \text{fm}$. We constructed the two-point correlation
functions from the rho and two pion operators, from which we extracted
the eigenenergies of a finite Euclidean lattice. Using the Lüscher
formalism, we fit the infinite...