PLANCK2024

Session

Parallel Session PII.6

6 Jun 2024, 16:40

IST, Lisboa

Conveners

Parallel Session PII.6

• Renato Fonseca (University of Granada)

264. How to rule out $(g-2)_\mu$ in $U(1)_{L_\mu-L_\tau}$ with White Dwarf Cooling

Patrick Foldenauer (Instituto de Física Teórica UAM/CSIC Madrid)

06/06/2024, 16:40

In recent years, the gauge group $U(1)_{L_\mu-L_\tau}$ has received a lot of attention since it can, in principle, account for the observed excess in the anomalous muon magnetic moment $(g-2)_\mu$, as well as the Hubble tension. Due to unavoidable, loop-induced kinetic mixing with the SM photon and $Z$, the $U(1)_{L_\mu-L_\tau}$ gauge boson $A'$ can contribute to stellar cooling via decays...

269. New Constraints on Gauged U(1)$_{L_\mu-L_\tau}$ Models via $Z-Z'$ Mixing

光 宮尾

06/06/2024, 17:00

It is known that the model based on U(1)$_{L_\mu-L_\tau}$ gauge symmetry can explain not only the discrepancy between the measured value of muon $g-2$ and the theoretical prediction, but also the structure of the neutrino mass and mixings. We revisit the analysis of the mass matrix structure in the minimal U(1)$_{L_\mu-L_\tau}$ models based on the latest experimental result, where the minimal...

297. Looking closer at the U(1)_(B-L) explanation of the ATOMKI nuclear anomalies

Bernardo Lopes Gonçalves

06/06/2024, 17:20

We revisit the gauged U(1)B−L explanation of the ATOMKI nuclear anomalies, in which the new gauge boson is the hypothetical X(17) particle. It is known that the vanilla B−L scenario is unable to account for appropriate couplings, namely the suppression of the couplings of X(17) to neutrinos, which motivates adding vector-like leptons. The simplest case, in which the new fields have B−L charges...

293. Extending the SM with vector-like quarks: consequences for CKM unitarity and CP violation

José Bastos

06/06/2024, 17:40

Although, a fourth chiral generation of fermions is excluded by experimental data, the possibility of extending the SM with vector-like quarks, where both chiral components transform the same way under SU(2)_L, has not been ruled out. In fact, these fields are present in a great variety of NP models, from GUTs to solutions to the strong CP problem.
Moreover, introducing VLQs leads to the loss...

253. Quarks at the modular $S_4$ cusp

Miguel Levy

06/06/2024, 18:00

We analyse the possibility of describing quark masses, mixing and CP violation in $S'_4$ modular flavour models without flavons. We focus on the case where the closeness of the modulus to the point of residual $\mathbb{Z}^{ST}_3$ symmetry (the cusp) plays a role in generating quark mass hierarchies and discuss the role modular form normalisations play in such constructions. We find that...

262. Modular stabilisation in the multiple-modulus framework

Xin Wang (University of Southampton)

06/06/2024, 18:20

Modular symmetry provides us with a satisfactory and appealing framework for addressing the flavour problem. The only flavons present in such a framework are one or more moduli fields $\tau$. It seems that the fixed points $\tau = i$ and $\omega$ play a special role in both the phenomenological model building and the 10d supersymmetric orbifold examples. In this talk, I will investigate a...

279. Reduction of Couplings in the 2HDM

Dr Gregory Patellis (Instituto Superior Técnico, CFTP)

06/06/2024, 18:40

The method of reduction of couplings consists in the search for relations between seemingly independent couplings that are renormalization group invariant. In this talk the existence of such 1-loop relations among the top Yukawa, the Higgs quartic and the gauge colour couplings of the Type-II Two Higgs Doublet Model at a high-energy boundary is demonstrated. The phenomenological viability of...