The $D^0 \to K_S^0 \pi^+ \pi^-$ decay channel plays a central role in precision studies of charm mixing and indirect CP violation.
In this talk, we present the status of the time-dependent binned analysis of this decay using data collected by the LHCb experiment during Run 3 in 2024.
This dataset benefits from the fully software-based trigger system introduced in Run 3, which significantly...
In this work, we present the development of an experimental apparatus aimed at testing the violation of CP symmetry in the decay of positronium. The experimental approach involves the detection of photons emitted in this process using the Nossa Caixa gamma spectrometer and the application of a magnetic field to manipulate the Ps states. Two complementary methods will be used to analyze the...
Recently, a strong tension in the global fit to $B\to h^+ h'{}^-\,(h\in\{\pi,K\})$ decay parameters has been highlighted by the theoretical community. These decays can be probed with high precision at LHCb: thanks to the high centre-of-mass energy provided by the LHC, it is possible to investigate time-dependent observables which are inaccessible at $b$-factory experiments. In this talk,...
The HIKE experiment was intended to continue the successful tradition of kaon experiments at CERN, building on the achievements of NA62 and exploiting the availability of a high-intensity beam together with an advanced detector design. In particular, the new shashlik electromagnetic calorimeter (MEC) was designed to reach a time resolution of approximately $100\,\text{ps}$, while maintaining...
The LHCb experiment is going to face much higher occupancies and radiation levels in its high-luminosity phase, requiring major upgrades of the electromagnetic calorimeter (ECAL). As a first step, an enhancement is planned during Long Shutdown 3 (LS3) of the LHC to mitigate ageing in the central region and to ensure stable performance after Run 3. This upgrade introduces Spaghetti Calorimeter...
Exotic hadron spectroscopy plays a crucial role in deepening our understanding of the confining regime of Quantum Chromodynamics (QCD). The discovery of the $X(3872)$ in 2003 by the Belle collaboration marked a turning point in hadron physics, as it represented the first strong candidate for an exotic meson beyond the conventional quark model. To date, the internal structure of the $X(3872)$...
The rare radiative leptonic decay $B^+\to\ell^+\nu_\ell\gamma$, with $\ell=\mu,e$, is considered a golden channel to probe the internal structure of the $B$ meson through its Light-Cone Distribution Amplitude (LCDA). Predicted by the Standard Model with a Branching Ratio (BR) of $\mathcal{O}(10^{-6})$, it has not yet been observed. The most stringent upper limit on its BR has been set by the...
Rare semileptonic four-body charm decays such as $D^0\to h^+h^-e^+e^-$ (with $h=\pi,K$) can proceed via long-distance (LD) resonant contributions or short-distance (SD) Flavor Changing Neutral Currents (FCNC) $c\to ue^+e^-$, which are highly suppressed in the Standard Model. These modes are therefore sensitive to potential new physics effects and provide a probe of Lepton Flavour Universality...
LADDIN (An LHC Apparatus for Direct Dipole moments INvestigation, https://aladdin.web.cern.ch/) è un esperimento compatto a bersaglio fisso proposto per LHC, concepito per ottenere misure di precisione senza precedenti dei momenti di dipolo magnetico (MDM) ed elettrico (EDM) dei barioni con charm. Il suo design innovativo sfrutta la deviazione dei protoni provenienti dall’alone del fascio...
The origin of Majorana neutrino masses suggests the existence of a sterile neutrino sector, which may be either too heavy or too weakly coupled to the Standard Model (SM) to be detected in the near future. The inverse seesaw mechanism provides a testable framework where the coupling between the sterile sector and the SM is large enough to allow direct experimental probes. In this context, it...
Over the past two decades, several heavy-flavor hadrons have been observed, with their properties inconsistent with predictions from conventional $q\bar{q}$ or $qqq$ models. These findings offer insights into quark binding and QCD. It is then important to continue the search for new states, as each discovery improves our knowledge and provides important input to the theory.
This talk...
More than twenty years have elapsed since the discovery of $\chi_{c1}(3872)$ previously denoted as $X(3872)$, and an impressive amount of theoretical and experimental studies has been devoted to its properties, decays and production mechanisms.
Despite the extensive work, a full understanding of the nature of $\chi_{c1}(3872)$ is still missing.
In the present study I reconsider a...
The LHCb experiment was designed to play a decisive role in the study of particle and flavor physics. From the very beginning, LHCb has performed measurements of CP violation in the decays of hadrons containing the charm quark with extremely high precision, and in 2019 it observed direct CP violation in the two-body charged decays of the $D^0$ meson for the first time, using data collected...
Lepton-flavour conservation is an almost perfect symmetry in the Standard Model of particle physics, violated so far only by neutrino oscillations. Neutrino mixing implies that lepton-flavour violation occurs in charged decays as well, albeit with extremely low branching fractions ($\mathcal{B}$) of order $\mathcal{O}(10^{-50})$. Therefore, any direct observation would be a clear and...
