Moderadores
Física Teórica
- Juan José Sanz-Cillero (Universidad Complutense de Madrid and IPARCOS)
Física Teórica
- Mercedes Martín (UCM)
Física Teórica
- Francesco Aprile (UCM)
Event shapes for massless quarks in $e^+e^−$ colliders have been widely used to investigate the gauge structure of the strong interactions, tune Monte Carlo simulations, learn about hadronization, and to determine the strong coupling with high precision. For the production of primary top quarks, it has been shown that a class of event shapes related to the invariant mass of the hemisphere can...
Atoms can act as electron accelerators, effectively providing a scan in energy when fixed-energy positrons from a beam collide with them. This talk explores the potential of this phenomenon for new physics searches, particularly for new vector bosons or pseudoscalars coupling to fermions, such as Dark Photons and ALPs. We propose using a positron beam directed at a fixed high-$Z$ target, such...
The LHCb has recently reported a huge CP violation (CPV) in $B$ meson decaying to three charmless light-pseudoscalar mesons, the greatest ever seen. It is strongly believed that this giant CPV is due to strong Final State Interactions (FSI), which amplify the CPV effect. However, the formalism that the LHCb is currently using to describe its phenomenology includes some unnecessary and crude...
Phenomenological evidence indicates that low-excitation hadrons often decay via the $^3P_0$ mechanism, involving the creation of a light quark-antiquark pair with zero angular momentum. This scalar decay term arises spontaneously upon chiral symmetry breaking, despite Quantum Chromodynamics being mediated by spin-one gluons and displaying chiral symmetry in its Lagrangian. We explore this by...
It is well-known that CP violation is one of the necessary ingredients to generate the observed matter-antimatter asymmetry of the Universe. Neutral B mesons naturally exhibit CP violating oscillations which can be related to the baryon asymmetry through the B-Mesogenesis mechanism. With this in mind, it is interesting to analyze how large this CP violation could be in different scenarios...
We have studied multi-Higgs production using the equivalence theorem for VBF and made some studies with LHC data to give some future predictions.
With the first detection of gravitational waves in 2016 a new window on the observation of the Universe has been opened. This has made possible several new tests of general relativity, discoveries on the physics of black holes, and opened a new way of studying physics beyond the Standard Model. There is evidence that the Standard Model (SM) of particle physics is not the ultimate description...
The upcoming launch of the LISA interferometer has recently strengthened the interest in exploring SM extensions where a gravitational wave-producing, strong first-order electroweak phase transition (SFOEWPT) occurs in the early universe. One of the preferred approaches to the study of thermal FOPTs is through the construction of a dimensionally reduced effective field theory (3dEFT) where the...
We study the J/ψ production at small transverse momenta at lepton-hadron colliders in the limit when the exchange photon is real, i.e. leptoproduction. In this talk I discuss the TMD factorization of the cross-section of that process in terms of the so-called TMD Shape Functions (TMDShFs), the promoted LDMEs when the transverse momentum becomes relevant. I then discuss our results for the...
The discrepancy between the fixed-order (FOPT) and contour-improved (CIPT) perturbative expansions for $\tau$-lepton decay hadronic spectral function moments have been affecting the precision of $α_s$ determinations for many years. The CIPT expansion is special because it is not a power expansion, but represents an asymptotic expansion in a sequence of functions of the strong coupling. In this...
This talk presents recent advances in the cancellation of ultraviolet (UV) and infrared (IR) singularities within perturbative quantum field theory (QFT), focusing on automating theoretical tools for more precise predictions at high-energy colliders. Loop-Tree Duality (LTD) is introduced as an efficient technique to achieve the local cancellation of singularities directly at the integrand...
The Standard Model Effective Field Theory (SMEFT) provides a systematic way to incorporate potential new physics effects and is therefore instrumental in testing the validity of the SM. To this end, a major challenge lies in achieving greater precision in SMEFT calculations, which includes the computation of observables to O(1/Λ²) (dimension-six) at one-loop and to O(1/Λ⁴) (dimension-eight) at...
A theoretical review of the $D^{+}_S\rightarrow K^+K^-K^+$ decay is shown by introducing the $W$-external emission topology and its visualization using Dalitz plots. The model relies on chiral perturbation theory ($\chi PT$) with resonances, the heavy quark spin symmetry (HQSS), form factors, and two bodies' final states interactions. The resulting amplitude for the $D^{+}_S\rightarrow 3K$...
Unraveling the inner dynamics of gluons and quarks inside nucleons is a primary target of studies at colliders. Finding an answer to fundamental problems of Quantum ChromoDynamics, such as the origin of nucleon mass and spin, strongly depends on our ability of reconstructing the 3D motion of partons inside the parent hadrons. We present progresses and challenges in the study and extraction of...
We explore "ridges" in the macroscopic properties of rotating neutron stars as potential indicators of first-order phase transitions in their matter. These phase transitions induce non-analytic behavior in observables like angular momentum, moment of inertia, mass, and radii, with the intensity of this behavior directly tied to the latent heat of the transition. Notably, the Seidov limit sets...
Effective field theories have been gathering increasing attention in recent years. Within this field, the matching process is a key question for connecting this formalism with precise UV theories beyond the Standard Model. It is precisely here where functional methods have emerged as very efficient tools, especially for automating computations.
So far, this method has been applied up to one...
Particle production from the vacuum due to a time-dependent geometry is a well-known phenomenon in quantum field theory in curved spacetimes and plays a significant role in the early Universe as spacetime evolves rapidly. In this work, we investigate particle production for spectator scalar and vector fields non-minimally coupled to gravity, accounting for the full dynamics of spacetime during...
Radiative neutrino mass models represent a vast landscape of possibilities for very exotic beyond Standard Model physics. In this talk, we will explore the idea of non-standard thermal histories in the Zee-Babu neutrino mass generation model and specifically consider the possibility of hypercharge non-restoration in the early Universe. We will find that careful treatment of finite-temperature...
The strong coupling $\alpha_s$ is the most important parameter of Quantum Chromodynamics (QCD) therefore it is essential to determine it with high precission. This work presents an improved approach for extracting $\alpha_s$ comparing the numerical results of lattice QCD simulations to the perturbative expansion of the QCD static energy. We apply R-improvement to its 3-loop fixed-order...
We discuss model-independent contributions to the electron-EDM, focusing on those
contributions emerging from a heavy scalar sector linearly realized. To provide a concrete new physics realization, we investigate the aligned 2HDM in the decoupling limit. We point out that logarithmically enhanced contributions generated from Barr-Zee diagrams with a fermion loop are present in the aligned...
In this presentation I will talk about the PNG-UNITsims suite, which includes the largest full N-body simulation to date with local primordial non-Gaussianities (local PNG), the PNG-UNIT. The amplitude of the PNGs is given by fNLlocal=100. The simulation follows the evolution of 4096^3 particles in a periodic box with Lbox=1h^−1Gpc, resulting in a mass resolution...
We propose an efficient method to perform on-shell matching calculations in effective field theories. The standard off-shell approach to matching requires the use of a Green's basis that includes redundant and evanescent operators. The reduction of such a basis to a physical one is often highly non-trivial, difficult to automate and error prone. However, on-shell matching allows to perform the...
A precise description of pion-pion interactions at low energies is
fundamental for many processes in hadronic physics. We present
preliminary work that introduces several improvements over a previous
dispersive analysis*. These include a refined treatment of
inelasticities, the introduction of G-waves, the study of Forward
Dispersion Relations (FDRs) up to 1.6 GeV, data description up to...
The ALICE collaboration has recently reported pi+-K_S femtoscopic correlations in pp collisions[1]. Here we show [2] how they can be well described using existing realistic pi-K interactions obtained from a dispersive analysis of scattering data [3], containing an accurate description of the kappa/K0*(700) resonance pole.
[1] . Acharya et al. (ALICE), Phys. Lett. B 856, 138915 (2024),...
