Conveners
Quark and Lepton Flavour Physics: Quark and Lepton Flavour Physics
- Weimin Song (Jilin University College of Physics (CN))
- Tomas Jakoubek (Weizmann Institute of Science (IL))
Quark and Lepton Flavour Physics: Quark and Lepton Flavour Physics
- Lucia Grillo (University of Glasgow (GB))
- Stefan Schacht (University of Manchester)
Quark and Lepton Flavour Physics
- Tomas Jakoubek (Weizmann Institute of Science (IL))
- Weimin Song (Jilin University College of Physics (CN))
Quark and Lepton Flavour Physics: Quark and Lepton Flavour Physics
- Lucia Grillo (University of Glasgow (GB))
- Stefan Schacht (University of Manchester)
Quark and Lepton Flavour Physics: Quark and Lepton Flavour Physics
- Weimin Song (Jilin University College of Physics (CN))
- Stefan Schacht (University of Manchester)
Quark and Lepton Flavour Physics: Quark and Lepton Flavour Physics
- Tomas Jakoubek (Weizmann Institute of Science (IL))
- Lucia Grillo (University of Glasgow (GB))
Quark and Lepton Flavour Physics: Quark and Lepton Flavour Physics
- Tomas Jakoubek (Weizmann Institute of Science (IL))
- Lucia Grillo (University of Glasgow (GB))
Quark and Lepton Flavour Physics: Quark and Lepton Flavour Physics
- Stefan Schacht (University of Manchester)
- Weimin Song (Jilin University College of Physics (CN))
Quark and Lepton Flavour Physics: Quark and Lepton Flavour Physics
- Lucia Grillo (University of Glasgow (GB))
- Weimin Song (Jilin University College of Physics (CN))
Quark and Lepton Flavour Physics: Quark and Lepton Flavour Physics
- Tomas Jakoubek (Weizmann Institute of Science (IL))
- Stefan Schacht (University of Manchester)
Quark and Lepton Flavour Physics: Quark and Lepton Flavour Physics
- Weimin Song (Jilin University College of Physics (CN))
- Stefan Schacht (University of Manchester)
Quark and Lepton Flavour Physics: Quark and Lepton Flavour Physics
- Lucia Grillo (University of Glasgow (GB))
- Tomas Jakoubek (Weizmann Institute of Science (IL))
Rare kaon decays are among the most sensitive probes of both heavy and light new physics beyond the Standard Model description thanks to high precision of the Standard Model predictions, availability of very large datasets, and the relatively simple decay topologies. The $K^{+} \rightarrow \pi^{+}\nu\bar{\nu}$ decay is a โgolden modeโ for search of New Physics in the flavour sector. The...
The NA62 experiment at CERN reports new results from the analyses of rare kaon and pion decays, using data samples collected in 2017-2018. A sample of $K^+ \rightarrow \pi^+ \gamma \gamma$ decays was collected using a minimum-bias trigger, and the results include measurement of the branching ratio, study of the di-photon mass spectrum, and the first search for production and prompt decay of an...
The KOTO experiment at J-PARC searches for the rare decay, $K_L โ ฯ^0ฮฝ\overlineฮฝ$. The mode is CP-violating, with a theoretical branching ratio highly suppressed in the Standard Model at $(2.94 ยฑ 0.15) ร 10^{โ11}$. With a small theoretical uncertainty, this search is sensitive to new physics. In the analysis of 2016-2018 data, there were three observed events within the signal region,...
The KOTO II is a next-generation experiment to measure the branching ratio of $K_L\to \pi^0\nu\overline{\nu}$ with 30-GeV proton beam at J-PARC. The KOTO II is a successor of the currently running KOTO experiment. We plan to expand the hadron experimental facility at J-PARC, and construct a new beamline of KOTO II there. The extraction angle of the $K_L$ is 5 degrees, which is smaller than...
Recent progress achieved in the standard B-unitarity triangle and in the Kaon unitarity triangle is discussed. In particular, we outline how further inroads into the Kaon UT can be made via K0=>pi0+l+l- in both theory and in experiments. In the current precision flavor era, where there are large fluxes of Bโs and kaonโs from LHCb, Belle-II, NA62, KOTO and the proposed experiments such as...
With the large datasets of $๐^+๐^โ$ annihilation at the ๐ฝ/๐ and ๐(3686) resonances collected by the BESIII experiment, multi-dimensional analyses making use of polarisation and entanglement can shed new light on the production and decay properties of hyperon-antihyperon pairs. In a series of recent studies performed at BESIII, significant transverse polarisation of the (anti)hyperons has been...
In any relativistic quantum field theory, such as Quantum Chromodynamics or Electroweak theory, the interactions are invariant under the combined operation of Charge conjugation (C), Parity transformation (P) and Time reversal (T). One of the consequences of this (CPT) symmetry is that particles and their corresponding antiparticles must have exactly the same mass. While the mass difference...
The Muon g-2 experiment at Fermilab aims to measure the muon magnetic moment anomaly, aฮผ = (gโ2)/2, with a final accuracy of 0.14 parts per million (ppm). The experimentโs first result, published in 2021 and based on Run-1 data collected in 2018, confirmed the previous result obtained at Brookhaven National Laboratory with a similar sensitivity of 0.46 ppm. In this talk, we will present the...
The Muon $g-2$ Experiment at Fermilab aims to measure the muon magnetic moment anomaly, $a_{\mu} = (g-2)/2$, with a final accuracy of 0.14 parts per million (ppm). A $3.1$-GeV muon beam is injected into a storage ring of $14\,$m diameter, in the presence of a $1.45\,$T magnetic field. The anomaly $a_\mu$ can be extracted by accurately measuring the anomalous muon spin precession frequency...
We describe the procedures that were developed to verify the consistency and combine multiple independent analyses of the muon precession measurement by the FNAL-E989 collaboration. These procedures were applied to the first (2021) and second (2023) results published by the collaboration. To properly verify the consistency of different analyses up to 20 ppb, correlations have been modeled and...
We report a measurement of the $e^+e^-\to\pi^+\pi^-\pi^0$ cross section in the energy range from 0.62$~$GeV to 3.5$~$GeV using an initial-state radiation technique. We use an $e^+e^-$ data sample corresponding to $191~\mathrm{fb}^{-1}$ of integrated luminosity, collected at a centre-of-mass energy at or near the $\Upsilon(4S)$ resonance with the Belle$~$II detector at the SuperKEKB collider....
Lepton flavor violation (LFV) is a suitable avenue to look for physics beyond the SM. The observation of neutrino oscillation has opened a new window, indicating new physics. In our work, we study the charged LFV $\mu$ decays such as $\mu\rightarrow e\gamma$, $\mu \rightarrow eee$, and $(\mu - e)_{\text{Ti}}$ with a vector leptoquark ($U_3$) by considering the constraints from non-standard...
The MEG II experiment searches for the lepton flavour violating decay $\mu^+\to e^+\gamma$ with the world's most intense continuous muon beam at the Paul Scherrer Institute and high-performance detectors, aiming at ten times higher sensitivity than the previous MEG experiment. The result with the first dataset in 2021 was published, and the MEG II experiment took data in 2022 and 2023...
The COMET Experiment at J-PARC aims to search for the lepton-flavour violating process of muon to electron conversion in a muonic atom, $\mu^{-}N\rightarrow\mathrm{e}^{-}N$, with a 90% confidence level branching-ratio limit of $6\times 10^{-17}$, in order to explore the parameter region predicted by most well-motivated theoretical models beyond the Standard Model. In order to realize the...
Explaining the matter-antimatter asymmetry in the Universe requires new sources of CP violation beyond the predictions of the Standard Model (SM). Electric dipole moments (EDMs) of particles, being zero if CP is exactly conserved and extremely small in the SM, are a very clean and sensitive probe for new physics. We will present the status of the muEDM experiment, a search for a muon EDM at...
Although unobservable in the standard model, charged lepton flavour violating (LVF) processes are predicted to be enhanced in new physics extensions. We present the final results of a search for electron-muon flavour violation in ๐ถ(3S) โ eยฑฮผโ decays using data collected with the BaBar detector at the SLAC PEP-II e+eโ collider operating with a 10.36 GeV centre-of-mass energy. The search was...
The Belle and Belle$~$II experiments have collected a $1.4~\mathrm{ab}^{-1}$ sample of $e^+e^-$ collision data at centre-of-mass energies near the $\Upsilon(nS)$ resonances. This sample contains approximately 1.3 billion $e^+e^-\to \tau^+\tau^{-}$ events, which we use to search for lepton-flavour violating decays. We present searches for tau decay to three charged leptons, $\tau^-\to K_{\rm...
The Belle$~$II experiment has collected a $424~\mathrm{fb}^{-1}$ sample of $e^+e^-$ collision data at centre-of-mass energies near the $\Upsilon(nS)$ resonances. This sample contains 389 million $e^+e^-\to \tau^+\tau^{-}$ events, which we use for precision tests of the standard model. We present measurements of leptonic branching fractions, lepton-flavour universality between electrons and...
The International Linear Collider (ILC) offers favorable low-background
environment as well as the high energy reach to measure properties of heavy
quarks and the top-quark in particular. As these particles are likely messengers of
new physics, precision measurements of their properties can be interpreted in the
context of search for beyond-the-Standard-Model (BSM) realizations. The...
The unparalleled production of beauty and charm hadrons and tau's in the $6\cdot 10^{12}$ Z boson decays expected at FCC-ee offers outstanding opportunities in flavour physics. A wide range of measurements will be possible in heavy-flavour spectroscopy, rare decays and CP violation, benefitting from a low-background environment, initial-state energy-momentum constraints, high Lorentz boost,...
Recent R&D work associated with upgrading the SuperKEKB $e^+e^โ$ collider with polarized electron beams and Chiral Belleโs program of unique precision measurements using Belle II will be described. These include five values of $\sin^2\theta_W$ via left-right asymmetry measurements ($A_{LR}$) in $e^+e^- \rightarrow e^+e^-, \mu^+\mu^-, \tau^+\tau^-, c\bar{c},b\bar{b}$. $A_{LR}$ yields values of...
The CEPC is a proposed electron-positron Higgs factory. It is expected to deliver millions of Higgs bosons, Teras of Z boson, Gigas of W boson, and potentially Teras of Z boson. On top of the precise Higgs property measurement, it could also conduct an intriguing flavor physics program that is highly complementary to other flavor physics facilities, as well as to other physics measurements at...
PIONEER is a next-generation precision experiment proposed at PSI to perform high precision measurements of rare pion decays. By improving the precision on the experimental result of the charged pion branching ratio to electrons vs. muons and the pion beta decay by an order of magnitude, PIONEER will provide a pristine test of Lepton Flavour Universality and the Cabibbo angle anomaly. In...
The Belle and Belle$~$II experiments have collected a 1.1$~$ab$^{-1}$ sample of $e^+ e^- \to B\bar{B}$ collisions at the $\Upsilon(4S)$ resonance. These data, with low particle multiplicity and constrained initial state kinematics, are an ideal environment to study semileptonic and leptonic decays of the $B$ meson. Combined with theoretical inputs, measurements of both inclusive and exclusive...
We investigate the role of different schemes in deciding at what order to truncate form factor expansions for semileptonic decays and how to determine the appropriate combination of truncations when multiple form factors are involved. The specific choice of truncation orders can significantly impact the reported values of exclusive $|V_{cb}|$. Additionally, we explore whether and how unitarity...
It is long known that interference effects play an important role in understanding the shape of the $\pi^+\pi^-$ spectrum of resonances near the threshold. In this manuscript, we investigate the role of the $\rho-\omega$ interference in the study of semileptonic $B \to \pi^+ \pi^- \ell \bar \nu_\ell$ decays. We determine for the first time the strong phase difference between $B \to \rho \ell...
Observed anomalies in the flavor sector as displayed by the LFU ratios $R_{D^{(*)}}$ in the tree level $b\rightarrow c \tau\nu_\tau$ transitions motivate the search for new physics beyond the standard model. The semileptonic tree level $b\rightarrow u$ sector may hide similar unexplored new physics. Considering a model-dependent approach, we explore the decay channel $B_c\rightarrow D...
Semileptonic $b$-hadron decays proceed via charged-current interactions and provide powerful probes for testing the Standard Model and for searching for New Physics effects. The advantages of studying such decays include the large branching fractions and reliable calculations of the hadron matrix elements. In this contribution, LHCb measurements on CKM paramenters and test of new physics will...
We review recent higher order calculations to properties of $B$ mesons. This includes next-to-next-to-leading order corrections to hadronic and next-to-next-to-next-to-leading order corrections to semi-leptonic $B$ meson decays. The latter is important in connection to the determination of the CKM matrix element $V_{cb}$. We also discuss next-to-next-to-leading order corrections to the width...
The Heavy Quark Expansion (HQE) has become the major tool to perform precision calculations for inclusive heavy hadron decays. With this method, $V_{cb}$ has been extracted with percent-level precision from moments of $B\to X_c\ell\bar{\nu}$. The HQE is an expansion in $1/m_b$ and introduces nonperturbative HQE matrix elements which can be extracted from data.
To further increase the...
Employing the full $BABAR$ dataset with hadronic tagging, we present a model-independent form factor analysis for $B\to D^{(*)}\ell\nu$ and a moments analysis for $B\to D^{*}\ell\nu$ . We also perform a combined lattice+$BABAR$ joint $B\to D^{(*)}\ell\nu$ form factor analysis employing an HQET parameterization. We report updated $|V_{cb}|$ and SM theory predictions for R(D(*)) from this analysis
We present a new global fit for inclusive $|V_{cb}|$ based on the Kolya open-source library, utilizing the full available set of spectral moments of semileptonic $B \to X_c \ell \bar \nu_\ell$ decays with state-of-the-art precision. Our approach includes a novel prescription to estimate the uncertainty arising from missing higher-order contributions of order $1/m^4$ in the heavy quark...
We systematically compute the ฮb(p,sb)โฮc(2595)+ and ฮb(p,sb)โฮc(2625)+ form factors within the heavy quark effective theory (HQET) framework including O(1/m^c_2) contributions. Besides taking into account the Standard Modelโlike vector and axial contributions, we further determine tensor and pseudotensor form factors. Our work constitutes a step forward with respect to previous analyses...
The Mu2e experiment at Fermilab will search for the coherent, neutrino-less conversion of a negative muon into an electron in the field of an aluminum nucleus, an example of Charged Lepton Flavor Violation (CLFV). Observation of CLFV at Mu2e would be an unambiguous signal of physics beyond the Standard Model (BSM). Mu2e aims to improve previous sensitivity on the conversion rate by four orders...
The Mu2e experiment at Fermilab will search for the neutrinoless muon-to-electron conversion in the nuclear field by stopping $\mu^{-}$ on an Al target. The experimental signature of $\mu^{-}$ to $e^{-}$ conversion on Al is the 104.97 MeV mono-energetic conversion $e^{-}$s. Rejection of one of the most important experimental backgrounds coming from muon Decays-In-Orbit requires a momentum...
The Belle and Belle II experiments have collected a 1.1$~$ab$^{-1}$ sample of $e^+ e^-\to B\bar{B}$ collisions at the $\Upsilon(4S)$ resonance. These data, with low particle multiplicity, constrained initial state kinematics and excellent lepton identification, are ideal to study lepton-flavour universality in semileptonic decays of the $B$ meson.
We present results on the ratios of...
New sources of CP violation, beyond the CKM matrix in the Standard Model (SM), which encodes the weak sector, are required to explain the baryon asymmetry of the universe. An additional mechanism within the SM that can generate CP violating electric dipole moments (EDMs), is through the QCD $\theta_s$ parameter, via the strong sector. Significant advances in the recent past coming from new...
In the SM, the electroweak bosons couple to the three lepton families with the same strength, the only difference in their behaviour being due to the difference in mass. In recent years, some deviations have been found in measurements of the ratios of branching fractions for $b$-hadrons decaying into final states with different lepton flavours. This talk presents recent results of lepton...
In arxiv:2312.07758 and arxiv:2206.11281 we applied the recently-developed Residual Chiral Expansion (RCE) to significantly reduce the set of unknown subsubleading hadronic functions to a set of highly-constrained functions at second order in Heavy Quark Effective Theory (HQET). In this talk, we present updated predictions for $R(D/D*)$ using the RCE and the recent new experimental inputs...
We do the complete 4-body angular distribution for the decay of $\Lambda_b^0 \to \Lambda_c^{+}(\to \Lambda \pi^{+})\tau \bar{\nu_{\tau}}$.We provide form factor for BGL parametrization and update the SM prediction for angular observables with the LFUV ratio $R(\Lambda_{c})$ which we find consistent with the Lattice.For the first time,the CP violating(CPV) observable are analyzed. Using the...
Results are presented on LF(U)V tests through precise measurements of decays involving heavy mesons and leptons, which are compared to the standard model predictions. The measurements use 13 TeV pp collision data collected by the CMS experiment at the LHC.
Charged lepton flavor violation (CLFV), poses a compelling indicator of potential physics beyond the standard model by violating the conservation of lepton flavor. A model is utilized featuring an additional Z$^{\prime}$ gauge boson to conduct an extensive comparative analysis of CLFV investigations at future lepton collider facilities, including a 240 GeV electron-positron collider and a muon...
The tension of $B\to K^{(*)}\bar\ell\ell$ decays with the Standard Model (SM) can be attributed to a short-distance (SD) $b s\bar\ell\ell$ interaction.
We show two methods to disentangle this effect from long-distance (LD) dynamics. Firstly, we do a comparison of the inclusive $b\to s\bar\ell\ell$ rate at high $q^2=m^2_{\ell\ell}\geq 15~\rm GeV^2$ with a determination based on data on the...
The $B^0 \to K^{*0}\mu^+\mu^-$ decay is mediated via the rare flavour changing neutral current transition $b \to s\ell^+\ell^-$, and constitute sensitive probes for New Physics (NP), as they are forbidden at tree-level in the SM. Virtual NP contributions can therefore have a large impact, and previous LHCb measurements of the decay have shown interesting tensions with the SM predictions at the...
Rare B-hadron decays mediated by $b\to s\ell^+\ell^-$ transitions provide a sensitive test of Lepton Flavour Universality (LFU), a symmetry of the Standard Model by which the coupling of the electroweak gauge bosons to leptons is flavour universal. Extensions of the SM do not necessarily preserve this symmetry and may give sizable contributions to these processes. Precise measurements of LFU...
Charged Lepton flavour violation (cLFV) is a flavour-changing short-range interaction among charged leptons. cLFV processes, although allowed by neutrino oscillations, are in the Standard Model highly suppressed, hence below any experiment sensitivity. Thus, a search for cLFV constitutes a clear probe of Beyond the Standard Model (BSM) physics. The LHCb collaboration has recently conducted...
Recent CMS results on rare decays with FCNC transition. The analyses are based on proton-proton collision data collected in pp collisions at sqrt(s)=13 TeV.
At the LHCb Experiment, we search for very rare decays of heavy hadrons containing b or c quarks. Most of these decays occur in the Standard Model (SM) through heavily-suppressed Flavour-Changing Neutral Currents (FCNC) leading to decay rates expected to be as tiny as 10^-9 or considerably below. These decays offer therefore various possibilities to search for deviations from SM predictions....
The Belle and Belle II experiments have collected a 1.1$~$ab$^{-1}$ sample of $e^+ e^-\to B\bar{B}$ collisions at the $\Upsilon(4S)$ resonance. These data, with low particle multiplicity and constrained initial state kinematics, are an ideal environment to search for rare $B$ decays proceeding via electroweak penguin processes and lepton-flavour violating decays to final states with missing...
The Belle-II experiment has recently measured $\mathcal{B}(B\to K\nu\nu)$, which appears to be almost $3\sigma$ larger than its Standard Model (SM) prediction. In this talk, I will critically revisit the status of the SM predictions for the $B\to K^{(\ast)}\nu\nu$ decays, and discuss the interpretation of this Belle-II measurement in terms of a general Effective Field Theory, as well as...
The Belle and Belle$~$II experiments have collected a 1.1$~$ab$^{-1}$ sample of $e^+ e^-\to B\bar{B}$ collisions at the $\Upsilon(4S)$ resonance. We present results on the radiative decays $B^0\to \gamma\gamma$, $B\to \rho\gamma$ and $B\to K^{*}\gamma$. $C\!P$ and isospin asymmetries are presented for the latter two decays. We also present results from decays involving $b\to s\ell^+\ell^-$...
Radiative rare b-hadron decays are sensitive probes of new Physics through the study of branching fractions, angular observables, CP violation paramenters and photon polarization. The LHCb experiment is ideally suited for the analysis of these decays due to its high trigger efficiency, as well as excellent tracking and particle identification performance. Recent measurements of the b-hadron...
Weak decays of beauty baryons offer an attractive laboratory to search for effects beyond the Standard Model (SM), complementary to searches in meson decays. Flavour changing neutral currents such as $b \to s\ell^+\ell^-$ transitions are of particular interest due to their high suppression in the SM. The LHCb experiment is ideally suited for the analysis of these decays due to its high trigger...
We present an update of the likelihood analysis of the general two Higgs doublet model, using both theoretical constraints and the latest experimental measurements of the flavour observables. We make use of the public code GAMBIT and find that the model can explain the neutral anomalies while respecting the latest measurement of RK((*)) by the LHCb and simultaneously fitting the values of the...
The beauty baryon spectroscopy exhibit a rich phenomenology, which contributes to a deep comprehension of fundamental interactions. The large sample of beauty baryons produced at the Large Hadron Collider offers an unprecedented opportunity to enhance our understanding of these particles through searching for new decay channels, measurement of b-baryon properties, and the exploration of new...
The latest CMS results on spectroscopy and properties of beauty mesons and baryons are presented. The results are obtained with the data collected by the CMS experiment in proton-proton collisions at sqrt(s)=13 TeV.
The Belle and Belle$~$II experiments have collected a $1.4~\mathrm{ab}^{-1}$ sample of $e^+e^-$ collision data at centre-of-mass energies near the $\Upsilon(nS)$ resonances. These data include a 19.2$~$fb$^{-1}$ sample collected near the $\Upsilon(10753)$ resonance. We present several results related to the following processes: $e^+e-\to \Upsilon(nS)\eta$, $e^+e-\to \gamma...
The latest studies of beauty meson decays to open charm final states from LHCb are presented. Several first observations and branching fraction measurements using Run 1 and Run 2 data samples are shown. These decay modes will provide important spectroscopy information and inputs to other analyses.
The LHCb experiment collected the world's largest sample of charmed hadrons during the Run 1 and 2 of the LHC (2011--2018). This allows performing some of the world's most precise measurements of production, quantum numbers and decay properties of known charmed baryons, as well as searching for new excited states. The latest results in this field are presented, including some new amplitude analyses.
The worldโs largest sample of $J/ฯ$ events accumulated at the BESIII detector offers a unique opportunity to investigate $ฮท$ and $ฮท^โฒ$ physics via two body $J/ฯ$ radiative or hadronic decays. In recent years the BESIII experiment has made significant progresses in $ฮท/ฮท^โฒ$ decays. A selection of recent highlights in light meson spectroscopy at BESIII are reviewed in this report, including...
This presentation will feature several recent results of charmonium decays, including four first-time observations: $\psi(3686) \to \Omega^- K^+ anti-\Xi^0$, $\eta_c(2S) \to K^+ K^- \eta$, $\eta_c(2S) \to \pi^+ \pi^- K_s K^{+/-} \pi^{-/+}$, and $\chi_{cJ} \to 3(K^+K^-)$. Additionally, an updated measurement of the M1 transition $\psi(3686) \to \gamma \eta_c(2S)$ with $\eta_c(2S) \to K\bar{K}...
The Belle and Belle$~$II experiments have collected a $1.4~\mathrm{ab}^{-1}$ sample of $e^+e^-$ collision data at centre-of-mass energies near the $\Upsilon(nS)$ resonances. These samples contain a large number of $e^+e^-\to c\bar{c}$ events that produce charmed mesons. We present measurements of charm-mixing parameters from flavour-tagged $D^0\to K^0_{\rm S}\pi^+\pi^-$ decays. Direct $C\!P$...
LHCb has collected the world's largest sample of charmed hadrons. This sample is used to measure the $D^0 -\overline{D}^0$ mixing and to search for $C\!P$ violation in the mixing. New measurements of several decay modes are presented, along with prospects for the sensitivity at the LHCb upgrades.
The LHCb experiment published the first observation of CP violation in the decay of charmed particles in 2019, using the decay channels $D^0 \to \pi^+\pi^-$ and $D^0 \to K^+K^-$. Additional measurements in other decay channels are essential to understand whether this effect can be explained within the Standard Model, or if new sources of CP violation are needed. We present the latest searches...
We update our analysis of D meson mixing including the latest experimental results. We derive constraints on absorptive and dispersive CP violation by combining all available data, and discuss future projections. We also provide posterior distributions for observable parameters appearing in D physics.
We revisit the problem of nonperturbative contribution to the mass difference in D0โD0bar mixing within the Standard Model.
As it is known the GIM cancellation in the leading OPE is very effective, and the SM calculation gives the result which is orders of magnitude smaller than the experimental value for this quantity. Therefore, it is necessary to go beyond the leading terms to catch...
The Belle and Belle$~$II experiments have collected a $1.4~\mathrm{ab}^{-1}$ sample of $e^+e^-$ collision data at centre-of-mass energies near the $\Upsilon(nS)$ resonances. These samples contain a large number of $e^+e^-\to c\bar{c}$ events that produce charmed mesons and baryons. We present searches for rare flavour-changing neutral current $c\to u\ell^+\ell^-$ processes in several decay...
It is well known that the decay rates of leptonic decays of mesons, as well as the rates and angular observables of semileptonic decays of mesons and baryons, can provide a window to physics beyond the Standard Model. We point out the difficulties and prospects of such an endeavor in the case of $c\to s e\nu$ for which both the experimental and theoretical uncertainties are under control....
LHCb is playing a crucial role in the study of rare and forbidden semileptonic decays of charm hadrons, which might reveal interactions beyond the Standard Model. We present the latest measurements of charm decays with two leptons in the final state.
BESIII has accumulated 4.5 $fb^{-1}$ of $e^+e^-$ collision data at the 4.6 and 4.7 GeV energies, presenting a unique opportunity to investigate $\Lambda_c^+$ decays. Our presentation will include the first measurement of the decay asymmetry in the pure W-boson-exchange decay $ฮ_c^+โฮ^0 K^+$, as well as the study of $\Lambda_c^+ \to \Lambda l^+ \nu$ and the branching fraction measurements of...
BESIII has collected 2.93 and 7.33 $fb^{-1}$ of $e^+e^-$ collision data at 3.773 and 4.128-4.226 GeV, recording the largest dataset of $D\bar{D}$ and $D_sD_s$ pairs in the world, respectively.
We will present the observation of $D^+ \to K_s a^0(980)$ and a new $a^0$-like state with a mass of 1.817 GeV, and the determination of U-spin breaking parameters of the decay $D^0 \to K_L \pi^+...
The rich structure of flavor physics provides a plethora of possibilities to test or constrain the standard model. This requires both precise experimental measurements as well as theoretical predictions. Determining nonperturbative contributions due to the strong force is the prime task of lattice QCD calculations leading e.g. to determinations of decay constants, form factors or bag...
The measurement of the decay rates $\eta_c\to\gamma\gamma$ and $\eta_b\to\gamma\gamma$ are part of the BES3 and Belle II programmes respectively as tests of the Standard Model. Here we provide, for the first time, precise SM values for these decay rates using lattice QCD. For $\Gamma(\eta_c\to\gamma\gamma)$ we obtain 6.788(61) keV in good agreement with, but much more accurate than,...
he Belle and Belle$~$II experiments have collected a 1.1$~$ab$^{-1}$ sample of $e^+ e^-\to B\bar{B}$ collisions at the $\Upsilon(4S)$. The study of hadronic $B$ decays in these data allow the precise measurement of absolute branching fractions and angular distributions of the decay products. These measurements provide tests of QCD and enable the generation of more realistic simulation samples....
We present an update of the analysis of $B^0_d$ and $B^0_s$ mesons to charmless three-body final states that include a $K^0_S$ meson. The primary goal of the analysis is to search for the as-yet unobserved decay mode $B^0_s \to K^0_S K^+K^-$ In addition, the branching-fraction measurements for the set of decay modes $B^0_{(d,s)} \to K^0_S h^+ h^{'-}$ (where $h$ and $h^{'}$ are each a pion or...
The presence of charmonium in the final states of $B$ decays is a very clean experimental signature that allow the efficient collection of large samples of these decays. Such a clean experimental signature makes these decays also suitable for precision measurements of beauty hadrons lifetime and width differences $\Delta\Gamma_{q}$ ($q=d,s$). In this work we present the most recent results of...
Uncover recent breakthroughs in Charge-Parity Violation (CPV) and lifetime measurements as presented by the CMS experiment. The measurements use 13 TeV pp collision data collected by the CMS experiment at the LHC.
ATLAS results on weak decays on b hadrons are presented, including studies of $B^0_{(s)}\to\mu^+\mu^-$ rare decay, precision CP violation measurements with $B^0_s\to J/\psi\phi$ decay, as well as $B^0$ meson lifetime measurement.
We propose a set of new optimized observables using penguin mediated decays together with their CP conjugate partners that are substantially cleaner than the corresponding branching ratios, which are plagued by large end point divergences. We find that the dominant contribution to the uncertainties of these observables stem from the corresponding form factors. The Standard model estimate of...
The latest time-dependent CP violation measurements using beauty to open charm decays from LHCb are presented. These decays provide sensitivity to important CKM parameters such as the angles beta and gamma from the unitarity triangle.
The Belle$~$II experiment has collected a 362 fb$^{-1}$ sample of $e^+e^-\to B\bar{B}$ decays at the $\Upsilon(4S)$ resonance. The asymmetric-energy SuperKEKB collider provides a boost to the $B$ mesons in the laboratory frame, enabling measurements of time-dependent $C\!P$ violation. We present measurements of both time-dependent and direct $C\!P$ violation in hadronic $B$ decays. Among the...
Measuring the mixing phases of the B0 and Bs mesons is very important to validate the CP violation paradigm of the Standard Model and to search for new physics beyond it. Golden modes to measure these quantities are those governed by tree-level $b\to c\bar{c}q$ transitions, that allow precise and theoretically clean determinations to be performed. Besides, measuring the mixing phases with...
Flavour physics represents a unique test bench for the Standard Model (SM). New analyses performed at the LHC experiments and new results coming from Belle II are bringing unprecedented insights into CKM metrology and new results for rare decays. The CKM picture provides very precise SM predictions through global analyses. We present here the results of the latest global SM analysis performed...
