Tag Archives: Evento scientifico

Speaker: Prisco Lo Chiatto (Max Planck Für Physik, Weizmann Institute of Science) We study scenarios in which ultralight dark matter (ULDM) causes oscillations of the Cabibbo–Kobayashi—Maskawa (CKM) matrix elements, considering two frameworks. The first, previously proposed in the literature, employs the Nelson–Barr mechanism to solve the strong CP problem and the CKM phase is identified with a pseudo-Nambu– Goldstone boson. The second, inspired by Froggatt–Nielsen flavor models, relies on quadratic couplings of the ULDM to the Standard Model while naturally suppressing linear couplings. On the experimental side, we outline a strategy to search for such oscillations at flavor factories using meson decays, focusing on the NA62 experiment as the most promising candidate for discovery thanks to its large kaon statistics. We show that the sensitivity of lifetime-based observables is parametrically degraded when the total particle flux is not known exactly, leading to a substantial loss of sensitivity compared to naive estimates. We therefore advocate alternative observables based on direct counting of events, which retain the expected 1/N1/N scaling and provide a robust probe of oscillating CKM elements. Our results highlight flavor experiments as a novel probe of ULDM through time-dependent signatures.

Speaker: Konstantin Schmid (University and INFN Padova) In searches for beyond the Standard Model (BSM) Physics, bottom-up effective field theories (EFTs), such as the Standard Model EFT (SMEFT) and Higgs EFT (HEFT), have become crucial theoretical tools. Especially the di-Higgs production process offers the opportunity to probe correlations among the couplings of one or two Higgs bosons to fermions and gauge bosons and this context, it serves as a powerful test of the underlying EFT framework. In this talk, we study Higgs pair production via gluon fusion within the HEFT and SMEFT, also including NLO QCD corrections and sub-leading operators. In particular, we focus on the effect of the Wilson coefficients on the invariant mass shapes and assess the sensitivity of angular observables to the contribution of sub-leading operators.

Speaker: Vindy Prasad (Jilin Univ.) The Standard Model (SM) successfully describes fundamental particles and their interactions but fails to explain several outstanding issues, including the nature of dark matter (DM). DM constitutes approximately one quarter of the total matter density of the universe and is invisible across the electromagnetic spectrum. It may account for observed anomalies such as galaxy rotation curves and other fundamental characteristics of our universe. DM may couple to SM particles via portals. These portals introduce several new physics particles, such as light Higgs boson, dark photon, axion-like particle, and sterile neutrinos. These new physics scenarios may also appear in several baryon- and lepton-number-violating processes. Furthermore, the origin of DM and the observed asymmetry between visible matter and antimatter may be connected through the introduction of a dark baryon. The new physics particles can be accessible at high-intensity electron-positron collider experiments, such as the BESIII experiment, if their masses are in the MeV-GeV range. BESIII has recently explored the possibilities of these new physics scenarios using large data samples collected at several energy points, including the J/psi, psi(2S) and psi(3770) resonances. This talk will review the recent BESIII results related to searches for new physics.

Il Convegno Nazionale SIRR, che ha una cadenza biennale, rappresenta il più importante momento di aggregazione sia per gli iscritti alla Società che per potenziali futuri soci interessati a condividere il loro lavoro e a discuterne le prospettive nei vari ambiti di ricerca coperti dalla SIRR. Il Convegno Nazionale SIRR 2026 è organizzato in collaborazione con l’Istituto Nazionale di Fisica Nucleare (INFN), grazie al recente accordo INFN–SIRR che formalizza e rafforza la sinergia tra le due comunità scientifiche. Sito web: https://web.infn.it/convegnonazionalesirr2026/

Speaker: Salvatore Procopio (ARPACal) Le attività di indagine radiometriche svolte sul territorio dall’Agenzia Regionale per la Protezione dell’Ambiente della Calabria, hanno individuato aree urbanizzate contaminate da Tenorm[i], rifiuti meta silicati fosforici generati dai processi produttivi presenti nella città di Crotone. Si tratta di aree aggiuntive, dove è stata accertata la presenza di una contaminazione radiologica, cosi come nel perimetro industriale, si registra un’anomalia radiometrica che conferma l’utilizzo degli scarti di lavorazione con eccellenti proprietà meccaniche. Il principio di sostenibilità ambientale praticato in questo territorio, a partire dalla fine degli anni ‘70 si è concretizzato con il reimpiego dei materiali contenenti radioattività naturale, potrebbe apparire persino visionario se analizzato con un sistema di riferimento che contempla le certezze o incertezze sul cambiamento climatico globale, salvo aver determinato evidentemente, l’impatto radiologico derivante dalla presenza di una vasta sorgente piana di radioattività naturale di uranio (238U) e torio (232Th). Le attività lavorative che prevedono l’impiego, il deposito e la produzione di materiali e/o di residui contenenti NORM (Naturally Occurring Radioactive Materials) possono determinare un aumento dell’esposizione radiologica dei lavoratori e/o della popolazione e sono opportunamente considerati dalla letteratura tecnica- scientifica[ii] e dalla normativa italiana sulle radiazioni ionizzanti (D. Lgs n. 101/2020 ss. mm. e ii). Sulla base dei dati acquisiti e dalle caratterizzazioni che hanno accertato la tipologia di contaminanti, vengono proposti modelli di calcolo per la stima delle dosi considerando le tre vie di esposizione ed in particolare per un gruppo di riferimento posizionato in prossimità dei punti caldi. [i] Technologically Enhanced …

Speaker: Dibyashree Sengupta (Cyprus Univ.) Since its discovery, the top quark has never been produced and studied in an environment as clean as that predicted for collisions at future electron-positron colliders. In this talk, I will discuss the possibility of inclusively measuring exotic excesses in the top decay width by studying the direct production at the FCC-ee in the all-jet decay channel, thus establishing model-independent limits on rare decays branching fractions of the top quark.  

Speaker: Haoyu Shi (IHEP) The discovery of the Higgs boson at the LHC in 2012 completed the Standard Model, yet precision measurements of its couplings and the electroweak sector are essential to reveal physics beyond it. The Circular Electron-Positron Collider (CEPC), a proposed next-generation Higgs factory, is designed to operate at a centre-of-mass energy of 240 GeV with a peak luminosity of $10^34 cm^{-2}~s^{-1}$, producing millions of Higgs bosons over its operation. The facility will also serve as a Z -boson factory and, in subsequent stages, explore higher energy frontiers. In this talk, I will present the baseline designs of the CEPC accelerator and reference detector—based on the Technical Design Reports published in 2023 and 2025, respectively —with particular emphasis on the machine–detector interface and integration challenges.

Speaker: Fernando Arias Aragón (LPSC, CNRS) Neutron stars are very dense media in which axions may be produced. Such a link leads to stringent limits on the axion characteristic energy scale by imposing restrictions on the neutron star cooling. In this presentation, I will show our current study on the dependence of this limit with respect to the particle composition of the neutron star core. We will do so by recalculating the limits on KSVZ and DFSZ axions using equations of state that assume different particles to be present within the neutron star.

Speaker: Claudio Emma (SLAC National Accelerator Laboratory) High intensity relativistic electron beams are among the most versatile and powerful probes of the natural world.Progress in our understanding of the fundamental forces of nature, as well as the structure of matter, has gone hand in hand with improvements to beam brightness, intensity and control. Next generation experiments will require beams with unprecedented properties: bunch lengths of 10s – 100s of nm, peak currents in the Mega Ampere scale and peak electric fields exceeding 1 V/angstrom. These experiments will push the boundaries of our understanding in areas ranging from high energy physics, strong field quantum electrodynamics, laboratory astrophysics, ultrafast photochemistry and material science. Furthermore, ultrashort, ultrahigh current electron beams are envisioned as drivers for future light sources, advanced particle accelerators and laserless gamma-gamma colliders. In this talk I will report on progress towards generating such extreme beams at the FACET-II facility at SLAC National Accelerator Laboratory. I will highlight recent experimental work conducted at the FACET-II Facility which generated the first 100 kA peak current, petawatt peak power electron bunches in a particle accelerator [1]. I will also outline a planned experimental campaign dedicated to increasing the peak current further from this result by an order of magnitude using plasma-based electron beam compression [2]. Finally, I will discuss relevant applications of these beams focusing on driving advanced attosecond X-ray sources with high peak power and broad tunability [3-4]. [1] C. Emma, N. Majernik, K. Swanson et al., PRL 134, 085001 (2025) [2] …