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The Flavor Physics and CP Violation (FPCP) conferences are intended for the exchange of new ideas, for presentation of the latest experimental and theoretical results in the areas included in the conference title, and for discussions about future projects in the field. The conference is open to all experimental and theoretical physicists interested in the field.
This conference series results from the merging of the Heavy Flavor Physics Conference and the International Conference on B Physics and CP Violation in 2002.
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More information here.
Link to past conferences: https://fpcp-conferences.web.cern.ch/past-conferences
The observation of lepton flavour violation (LFV) in interactions involving charged leptons would be an unambiguous sign of physics beyond the Standard Model of particle physics. Given that muons can be produced at high intensities, searches for LFV with muons are particularly sensitive.
In a global initiative, ongoing and upcoming experiments are aiming to discover physics beyond the Standard Model in the three golden muon LFV channels: $\mu\to e\gamma$, $\mu\to eee$ and $\mu\to e$ conversion on nuclei. With innovative detector concepts and new muon beam lines, these experiments will be able to investigate muon LFV with sensitivities improved by up to four orders of magnitude compared to past searches in the coming years.
In this talk, the current status of muon LFV searches will be discussed and the ongoing MEG II and DeeMe experiments as well as the upcoming Mu2e, COMET and Mu3e experiments will be presented.
Motivated by the crucial role played by the discrete flavour symmetry groups in explaining the observed neutrino oscillation data, we consider the application $A_4$ modular symmetry in the linear seesaw framework. The basic idea behind using the modular symmetry is to minimize the necessity of the inclusion of extra flavon fields having specific vacuum expectation value (VEV) alignments. The breaking of flavor symmetry takes place when the complex modulus $\tau$ acquires VEV. The main issue of the perplexing vacuum alignment is avoided, the only requirement is a certain kind of mechanism which can fix the modulus $\tau$. Linear seesaw in this framework is realized with six heavy $SU(2)_L$ singlet fermion superfields and a weighton in a supersymmetric framework. The non-trivial transformation of Yukawa couplings under the $A_4$ modular symmetry helps to explore the neutrino phenomenology with a specific flavor structure of the mass matrix. We discuss the phenomena of neutrino mixing and show that the obtained mixing angles and CP violating phase in this framework are compatible with the observed $3\sigma$ range of the current oscillation data. In addition, we also investigate the non-zero CP asymmetry from the decay of lightest heavy fermion superfield to explain the preferred phenomena of baryogenesis through leptogenesis including flavor effects.
The B3−L2 Z′ model may explain some gross features of the fermion mass spectrum as well as the b -> sll anomalies. The Z' acquires its mass via a TeV-scale scalar field, the flavon (θ), whose VEV spontaneously breaks the family non-universal gauged U(1) symmetry. In this talk, I will discuss the phenomenology of the flavon field. After introducing the model, with an emphasis on its scalar potential, experimental data and perturbativity arguments are used to place bounds upon the parameter space of the model. I will then examine flavonstrahlung (Z'* → Z′ θ production) at hadron and muon colliders as a means to directly produce and discover the flavon. We will see that a 100 TeV FCC-hh or a 10 TeV muon collider would have high sensitivity to flavonstrahlung, whereas the HL-LHC can observe it only in extreme corners of parameter space.
Charm Physics is highly topical in the current flavour landscape, especially after the announcement by LHCb of the measurement of direct CP asymmetries in the separate decays of $D^0\rightarrow K^+K^-$ and consequently $D^0\rightarrow \pi^+\pi^-$, which was preceded by the discovery of direct CP violation in the difference of these two asymmetries. The experimental result is extremely difficult to interpret, as the fully hadronic decays of charm entail significant QCD uncertainties, precluding tests of the Kobayashi-Maskawa mechanism in the up-type sector. In this work we address the problem of the determination of the strong amplitudes involved by considering very general properties of amplitudes, namely unitarity and analyticity. We implement these properties in two-channel dispersion relations which describe the final-state interactions between the pion and kaon pairs. First, using data-driven parameterisations of just the two-pion and two-kaon rescattering phases as input for the dispersion relations we are able to set upper bounds for the amount of CP asymmetry allowed within the SM in either decay of $D$ mesons. In a second work, by also implementing an appropriate parameterisation of the inelasticity between these two channels which reproduces the experimental branching fractions we are able to make a prediction for the CP asymmetries in the aforementioned channels, as well as the isospin-related ones $\pi^0\pi^0$ and $K^0\overline{K^0}$.
The Standard Model Effective Field Theory (SMEFT) is a powerful tool to search for new physics in a model-independent way. We explore the synergies arising from different types of observables in a combined, global SMEFT fit. Specifically, we investigate the combination of top-quark measurements, $b\to s$ flavor changing neutral current transitions, $Z \to b\bar b$ and $Z \to c\bar c$, as well as Drell-Yan data from the LHC. We also examine the impact of Minimal Flavor Violation (MFV) as a flavor pattern in the global fit. We find that the combination of high-pt with flavor physics observables provides powerful synergies that significantly improve the fit and enable more precise tests of various SMEFT operators. By incorporating different observables, we are able to remove flat directions in the parameter space and make inferences on the flavor structure based on the MFV parameterization. In particular, we find that MFV significantly strengthens the constraints in comparison to a flavor-specific approach. Furthermore, our analysis yields a prediction for the dineutrino branching ratios within MFV, which can be tested experimentally at Belle II
Theoretical developments over the last few years have lead to large shifts in the nuclear corrections to superallowed beta decays, albeit with enlarged uncertainties given different theoretical approaches. Nevertheless, this has lead to a shift in the value of $V_{ud}$, and a discrepancy when compared to the value implied by CKM unitarity.
On top of this, improved precision in lattice QCD calculations have revealed another discrepancy between kaon and pion semi-leptonic decays. The combination of these three can be referred as the Cabibbo angle anomalies (since in a two flavour model all three observables should determine a single parameter, the Cabibbo angle).
After summarising the current state of these issues, I will talk about new physics models that modify the coupling of the $W$ boson to quarks as a potential explanation. I will describe the results of a general analysis of all corresponding SMEFT operators, as well as of vector-like quarks, which are UV completions of these EFT scenarios, and how other constraints are important in determining the most likely explanation.
Based upon work in arXiv:2212.06862.
Deviations from the Standard Model have long been observed in semileptonic B-meson decays, notably b→ sll transitions, triggering speculations on potential New Physics effects in this sector. After the recent update of RK(*) and BR(B(s) → μμ) by the LHCb collaboration, the sole remaining significant deviations from the SM in FCNC B decays are found in the branching ratios of mesonic decays involving b → sμμ and in the angular observable P’5.
Unlike RK( ) and BR(B(s) → μμ), the observable BR(B(s) → Mμμ) (M = K(),φ,…) is theoretically challenging to predict accurately because of non-perturbative QCD contributions, both local and non-local. These contributions yield a theoretical error of order 30%, which can be as large as (sometimes larger than) the experimental uncertainty, and clearly hamper the potential of these observables for discovery.
At low hadronic recoil these form factors can be computed using lattice QCD methods, while the large recoil region requires analytical approaches such as Light Cone Sum Rules (LCSR). We undertake a new calculation of mesonic b → s form factors using LCSR with B-meson Distribution Amplitude. The form factors predictions are then used to compute relevant observables and perform fits of NP scenarios in the WET.
We report on the construction of a factorization theorem that allows to
systematically include QCD corrections to the contribution of the
electromagnetic dipole operator O7 to the $\bar B_s \to \mu^+\mu^-$
decay amplitude. We elaborate on how the occurring endpoint divergences
appearing in individual momentum regions cancel, and show how the
resulting rapidity logarithms can be isolated by suitable subtractions
applied to the corresponding bare factorization theorem. This allows to
include in a straightforward manner the QCD corrections arising from the
renormalization-group running of the hard matching coefficient, the
hard-collinear scattering kernel, and the $B_s$-meson distribution
amplitude. We estimate the effect numerically using a recently advocated
parameterization of the $B_s$-meson light-cone distribution amplitude.
CP violation in the quark sector has been established, which is described by the CKM phenomenon, and we are entering the precision era as far as Flavor physics is concerned. Accumulation of more data from the LHCb and Belle II experiments will, hopefully, guide us to the pathway to physics beyond the standard model. But the tiny CP asymmetry observed in the quark sector cannot explain the observed baryon asymmetry of the Universe. In this context, it is widely believed that leptonic CP violation could be the salvage. Interestingly, the measured non-zero value of $\theta_{13}$ has opened the door to optimism. Needless to mention, the determination of CP violating phase $\delta_{CP}$ is the prime target of most of the current and upcoming neutrino experiments. Unfortunately, non-standard interaction can be a spoiler for the clean determination of the CP phase. We explore, the effect of non-standard interaction and study NSI effect in the future experiments DUNE and T2HK, taking inputs from the currently running long baseline experiments, i.e., T2K and NOvA. Considering non-standard interaction effects from $e-\mu$ and $e-\tau$ sectors, we find interesting and perceptible results concerning the probabilities, the octant of the $\theta_{23}$, and the CP sensitivity. Therefore, better understanding of the NSI effects will be crucial for the immaculate determination of $\delta_{CP}$.
We present the most recent $BABAR$ searches for Dark-matter states with masses below the electroweak scale.The results are based on the full data set of about 470 $\text{fb}^{-1}$ collected at the $\Upsilon(4S)$ resonance by the $BABAR$ detector at the PEP-II collider.
They include, in particular, a search for decays like $B^{0}\to\psi_{D} {\cal B}$ where $\cal{B}$ is a baryon (proton, $\Lambda$, or $\Lambda_c$ ), which produce the dark matter particle ($\psi_{D}$) and baryogenesis simultaneously. The hadronic recoil method has been applied with one of the $B$ mesons from $\Upsilon(4S)$ decay fully reconstructed, while only one baryon is present in the signal $B$-meson side. The missing mass of signal $B$ meson is considered as the mass of the dark particle $\psi_{D}$. Stringent upper limits on the decay branching fraction are derived in the energy region between 0.5 and 4.2 GeV/c$^2$.
SND@LHC is a compact and stand-alone experiment to perform measurements with neutrinos produced at the LHC in a hitherto unexplored pseudo-rapidity region of 7.2 < 𝜂 < 8.6, complementary to all the other experiments at the LHC. The experiment is located 480 m downstream of IP1 in the unused TI18 tunnel. The detector is composed of a hybrid system based on a 800 kg target mass of tungsten plates, interleaved with emulsion and electronic trackers, followed downstream by a calorimeter and a muon system. The configuration allows efficiently distinguishing between all three neutrino flavours, opening a unique opportunity to probe physics of heavy flavour production at the LHC in the region that is not accessible to ATLAS, CMS and LHCb. This region is of particular interest also for future circular colliders and for predictions of very high-energy atmospheric neutrinos. The physics programme includes studies of charm production, and lepton universality tests in the neutral sector. The detector concept is also well suited to searching for Feebly Interacting Particles via signatures of scattering in the detector target. The first phase aims at operating the detector throughout LHC Run 3 to collect a total of 250 fb−1. The experiment was recently installed in the TI18 tunnel at CERN and has collected its first data in 2022. A new era of collider neutrino physics has started.
We report on the search for visible decays of exotic mediators from data taken in "beam-dump" mode with the NA62 experiment. The NA62 experiment can be run as a "beam-dump experiment" by removing the Kaon production target and moving the upstream collimators into a "closed" position. More than $10^{17}$ protons on target have been collected in this way during a week-long data-taking campaign by the NA62 experiment. We report on new results from analysis of this data, with a particular emphasis on Dark Photon and Axion-like particle Models.
The HIBEAM-NNBAR program is a proposed two-stage experiment at the European Spallation Source (ESS) designed to to search for baryon number violation, which is – together with C and CP violation – one of the three fundamental Sakharov conditions to explain the observed baryon asymmetry of the Universe. Taking advantage of the ESS' unique capabilities as the future brightest neutron source, the experiment would make high sensitivity searches for neutrons converting into antineutrons and/or sterile neutrons. In this talk I will present the status of the program and present the plans for the coming years.
Electric dipole moments (EDMs) in spin 1/2 particles such as the neutron or the electron are highly sensitive probes for CP violation beyond the Standard Model, which is required in order to fully explain the baryon asymmetry in the universe. n2EDM is an experiment in the commissioning phase at the Paul Scherrer Institute and one leading effort to search for the neutron EDM. The nEDM collaboration set the current limit $|d_n| < 1.8\times 10^{-26} e$cm (C.L. 90%) in our preceding experiment and now plans to improve it by one order of magnitude. This presentation will provide an overview of the n2EDM experimental concept, based on Ramsey's method of separated oscillating fields, and present the current state of the apparatus. Focusing on the most recent progress, we will in particular report on the characterization and optimization of the experiment's magnetic environment.
Employing the full $BABAR$ dataset, the first two-dimensional unbinned angular analysis of the semileptonic decay $\overline{B}\to D\ell^m \overline{\nu_\ell}$ is performed in both $q^2$ and lepton helicity angle, making use of the hadronic reconstruction of the tag-side $B$ meson. Here $\ell$ stands for an electron or a muon. A novel data-driven signal-background separation procedure with minimal dependence on simulation is developed, that preserves all multi-dimensional correlations present in the data.
Including input from latest lattice QCD and previously available experimental data, the underlying form-factors are extracted in both model-dependent and independent methods. The CKM matrix element $|V_{cb}|$ and the SM prediction of the lepton-flavor universality violation variable R(D) are extracted.