In this talk, we explore the dynamics of charm quarks through two key observables: charmed hadron lifetimes and neutral D-meson mixing. For lifetimes, we review the application of the Heavy Quark Expansion (HQE) to charm hadrons, examining recent theoretical efforts to quantify the convergence of the expansion at the charm scale, including the impact of higher-dimensional operators and...
In this talk I'll give an overview of the two-body decays of charmed mesons
and their CP violation. Recent developments in $D\to VP$ and $VV$ decays
are discussed. Attention is paid to the enigmas occurred in recent measurements
of $D\to VV$. The long-distance penguin, which is the key ingredient responsible for direct CP violation in $D\to PP$ and $VP$, is emphasized and elaborated on.
In this talk I will focus on the tau -> pi pi gamma nu process. Special attention will be paid to the triple-product asymmetry arising from this decay channel. Anomalous rho-omega-pi type of interacting vertices, together with the ones with even parity, are simultaneously included in our calculation. The branching fraction of the radiative two-pion tau decay is predicted to be around 10^-4...
For charm mixing, it is known that the lowest order analysis in the operator product expansion (OPE) does not reproduce the experimental data, indicating the importance of power-suppressed corrections. In particular, contributions induced by quark condensates are discussed as possible sources of enhancement in the previous works. Those investigations generically imply that chiral symmetry...
The $\tau$ lepton is the only known lepton massive enough to decay into hadrons. Besides serving as a clean laboratory for studying various low-energy aspects of the strong interactions, the hadronic $\tau$ decays may also allow us to explore CP-violating effects both within and beyond the SM. In this talk, I will discuss the CP asymmetries in $\tau \to K_S \pi \nu_\tau$ decays, which arise...
We extend the nonrelativistic QCD framework to explore the nature of the newly discovered di-$J/\psi$ resonances. Assuming them as either molecule-like states or tetraquarks, we calculated their hadroproduction cross sections at the LHC. We find that the observed resonances are most likely spin-2 particles, and there should exist their spin-0 counterparts near these resonances. The ratio of...
Semileptonic decays of charm-flavored hadrons, particularly D mesons, offer important avenues to address key questions in heavy-flavor physics, such as the long-standing discrepancy between inclusive and exclusive determinations of CKM matrix elements involving charm quarks. Precision measurements of semileptonic D-meson decays demand equally accurate theoretical predictions, for which QCD...
In this talk, I will present our recent follow-up lattice study building on our previous single-channel D\pi analysis (PRD 111, 014503 (2025)). In particular, I will discuss the two-pole structure of the D_0^*(2300) resonance.
Recent BESIII measurement of $J/\psi \to e^+e^-\pi^0$ has revealed a significant $\rho$-$\omega$ interference pattern in the di-electron invariant mass spectrum. This observed pattern is qualitatively similar to that of the pion form factor but features a relatively narrow $\rho$ resonance. Motivated by this observation, we present updated Vector Meson Dominance (VMD) predictions for the rare...
The doubly charmed baryon, $\Xi_{cc}^{++}$, was first observed by
LHCb through the non-leptonic decay modes of $\Xi_{cc}^{++}\to\Lambda_{c}^{+}K^{-}\pi^{+}\pi^{+}$
and $\Xi_{c}^{+}\pi^{+}$. Following this discovery, researchers shifted
their focus to identifying other doubly charmed baryons, specifically
$\Xi_{cc}^{+}$ and $\Omega_{cc}^{+}$. In this study, we examine
the non-leptonic weak...
In this talk we give an overview of the theory of charm decays. We present the special features that distinguish charm decays from other flavour processes and highlight the opportunities for the indirect discovery of NP in this sector. We explain the theoretical challenges present in the SM calculations of long-distance QCD effects, which are dominant both in the hadronic and the rare...
The dataset collected by the LHCb collaboration during Run 1 and Run 2 has played a major role in the progress of charm physics. For Run 3 of the LHC, the LHCb detector was upgraded to operate at higher instantaneous luminosities. This talk presents the first results obtained with early Run 3 data, measuring the production asymmetries of $D^0$, $D^+$, and $D_s^+$ charm and anticharm mesons in...
The BESIII experiment has collected 2.7 billion psi(3686) events, 10 billion J/psi events, 20 fb^-1 D meson pairs at 3.773 GeV, and 7.33 fb^-1 DsDs* events from 4.128 to 4.226 GeV. The huge data samples allow us to search for rare processes and new physics in charm hadron decays. In this talk, we report the search for FCNC decay in Ds+âh(h')e+e-, lepton number violation process...
Meson decays offer a powerful probe for studying Axion-Like Particles (ALPs). In this talk, I will present our recent phenomenological analysis exploring ALP production in these decays, reviewing the current bounds across different channels. For this study, we systematically include hadronic ALP decays alongside a comprehensive set of ALP signatures: invisible, prompt, and displaced decays. We...
Electric dipole moments (EDMs) provide strong bounds on the CP structure of many New Physics (NP) scenarios. In this work, we study the charm Chromo-EDM (CEDM) within a new light scalar singlet with top-quark Flavour-Changing Neutral Current (FCNC) interactions. Such scalar singlet appears naturally in many well-motivated NP scenarios, such as the composite Higgs models. Unlike the Higgs boson...
The study of polarization in heavy-flavor meson decays into Vector-Vector （VV） states offers a unique opportunity to explore the non-perturbative aspects of Quantum Chromodynamics. While the B→VV puzzle has been extensively investigated, there remains a scarcity of data in the charm sector. This report aims to present a concise summary of the measurements related to D→VV decays as conducted by...
The violation of the charge-parity (CP) transformation symmetry, which although has been observed in plenty of pure meson decay processes, was only confirmed just very recently by the LHCb collaboration in the four-body decay of the heavy baryon $\Lambda_b^0$, $\Lambda_b^0\to p K^- \pi^+ \pi ^-$, through a comparison of the decay branching ratio with that of the CP-conjugate process. However,...
The decay of the D meson into multibody final states is a complex process that provides valuable insights into the fundamental interactions within the Standard Model of particle physics. This study focuses on the decay cascade $D^{+}\to K^{*}_{J} \ell^{+}\nu \to K^{\pm}\pi^{\mp} \ell^{+}\nu$ where the $K^*_J$ resonance encompasses the $K^*(892),K^{*}(1410),K^{*}_0(1430)$ states. We...
I will talk about the general aspect of charm CPV and then focus on the recent progresses on CPV of charmed baryons.
This talk aims to systematically examine the state-of-the-art developments, persistent challenges, and emerging frontiers in first-principles determinations of heavy meson non-perturbative structure, including the light-cone distribution amplitudes (LCDAs) and shape functions (SFs). We will critically assess recent breakthroughs in effective theory frameworks and lattice QCD simulations, while...
Charmed hadrons can be described in a non-relativistic theory framework by theories such as pNRQCD and Born-Oppenheimer field theory. While the appropriate effective field descriptions are known up to high orders in perturbation theory, they require non-perturbative information of low-energy correlators. Lattice QCD is a perfect tool to measure these correlators and potentials. In this talk,...
We present a comprehensive study of near-threshold structures in the J/\psi J/\psi mass spectrum using the fully reconstructed J/\psi J/\psi \rightarrow 4\mu final state, based on proton-proton collision data at \sqrt{s} = 13 and 13.6 TeV collected by the CMS experiment. With approximately four times more J/\psi pair candidates compared to the previous Run 2 dataset, the combined data sample...
In this talk, I will introduce recent progresses on the radiative and semileptonic decays of charmed mesons using the lattice QCD method.
The unique structure of charmed baryons makes them an ideal laboratory for studying QCD in the non-perturbative regime. Research in charm baryon spectroscopy has provided valuable insights into QCD interactions, quark confinement, and broader topics in modern physics. The LHCb detector, dedicated to heavy flavor studies, enables high production rates and efficient detection of charmed...
Semi-leptonic decays offer an ideal place to deeply understand hadronic transitions in the nonperturbative region of QCD and explore the weak and strong interactions in the charm sector. Combining with experimental data, the CKM matrix element can be extracted, and it helps to test unitarity of CKM matrix and searching for new physics beyond SM. In this talk, the full lattice QCD calculations...
While the light scalar mesons ($S_0$) are considered to be either ordinary $q\bar q$ or exotic tetraquark states, we investigate the semileptonic decays $D\to S_0 e^+\nu_e$, by taking into account the resonant effects of $S_0\to M_1 M_2$, where $S_0=a_0(980)$, $f_0(980)$, and $f_0(500)/\sigma_0$, and $M_{1(2)}$ represents a pseudoscalar meson. The $D\to S_0$ form factors in the different quark...
One of the primary goals of the AdS/QCD program is to describe hadron spectroscopy accurately. The holographic confining potential, typically written through geometrical deformations or AdS bulk dilaton fields that induce confinement, plays a central role in achieving this. Specifically, the dilaton derivatives govern the large $z$ behavior of the holographic confining potential, where $z$...
We simulate the production of charmed-strange tetraquarks, $T_{cs0}(2900)^0$, $T_{cs1}(2900)^0$, $T_{c\bar{s}}(2900)^{0}$ and $T_{c\bar{s}}(2900)^{++}$ , as hadronic molecules, in $pp$ collisions through the framework of hadronic rescattering. The transverse momentum and rapidity distributions of selected tetraquarks are also studied under different multiple-parton interaction (MPI) tuning....
We study the nonleptonic three-body charmed baryon weak decays of $\mathbf{B}_{c}\rightarrow\mathbf{B}_{n}PP^{\prime}$ and the two-body decays of $\mathbf{B}_{c}\rightarrow\mathbf{B}_{D}P$ under the $SU(3)_{F}$ flavor symmetry,in which $\mathbf{B}_{c}$ denotes the anti-triplet charmed baryon, comprising $(\Xi^{0}_{c},-\Xi^{+}_{c},\Lambda^{+}_{c})$, while $\mathbf{B}_{D}$, $\mathbf{B}_{n}$, and...
Our study focuses on the weak decay of ( D_s^+ \to p \overline{n} ), which is the only possible two-body baryonic decay in the ( D ) meson system. An analysis using perturbative quantum chromodynamics (pQCD) is challenging in this decay due to the small amount of energy released. In particular, naive factorization, suppressed by the light quark masses, results in a minor contribution to...
Hyperons offer a distinctive approach for studying the strong interaction, and their production in $e^+e^-$ collisions constitutes a novel and feasible means to acquire information for comprehending hyperon structure, internal dynamics, and even the nature of charmonium(-like) states. With the unique datasets obtained by the BESIII experiment, the recent findings regarding the hyperon pair...
The Upgrade II of the LHCb experiment is proposed for the long shutdown 4 of the LHC. The upgraded detector will operate at a maximum luminosity of 1.5×1034 cm-2 s-1, with the aim of reaching a total integrated luminosity of ∼300 fb-1 over the lifetime of the HL-LHC. The collected data will probe a wide range of physics observables with unprecedented accuracy, with unique sensitivities for the...
The Super Tau Charm Facility (STCF), a planned symmetric electron-positron collider in China, aims to facilitate $e^+e^−$ collisions across a center-of-mass energy range of 2 to 7 GeV, targeting a peak luminosity of $0.5×10^{35}\mathrm{cm}^{−2}\mathrm{s}^{−1}$. With an anticipated annual integrated luminosity exceeding $1~ab^{−1}$, the STCF is poised to generate vast datasets. These will...
