We discuss open heavy flavor and quarkonium production in $p+p$ and $p+A$ collisions. We describe cold nuclear matter effects in the context of $p+A$ collisions.
Acknowledgement: This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344 and supported by the U.S. Department of Energy, Office of...
The properties of parton shower in QCD depend on the flavor of the parton involved in the 1 → 2 splitting processes that drive the showers. In particular, they are sensitive to the different Casimir factors of quarks and gluons, as well as to parton mass effects. To explore these dependencies, we use heavy-flavor jets as an experimental tool, with a particular focus on the low transverse...
Heavy quark exotic candidates continue to be observed at CERN and other laboratories. A survey of the field is made with focus on whether an organizational scheme for the multitude of states is possible.
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 to probe its potentially exotic nature. We present several results related to the following processes: $e^+e^-\to...
The T_cc^+ is a a doubly charmed tetraquark that lies very close to the D^* D meson thresholds. As such it can be described as a molecular bound state in an effective field theory (EFT) of heavy mesons. An EFT calculation of the width is in excellent agreement with experiment and also successfully reproduces the invariant mass spectrum of the D mesons in the three body decays of the T_cc^+....
In the last years, several exotic hadrons have been observed in the charm sector; such particles cannot be interpreted as conventional baryons or mesons and are thought to be either quark bags or molecular states. To unveil their nature, it is crucial to experimentally constrain the strong force that governs the interaction between the charm hadrons and other hadrons, for instance, by...
This presentation will discuss three recent measurements conducted at BESIII of the cross-sections of electron-positron annihilation into open or hidden charm final states. The first measurement utilizes e+e- collision data collected at BESIII, spanning center-of-mass energies from the threshold to 4.95 GeV. Precise measurements of the cross-sections of e+ e- -> Ds+ Ds- have been performed....
We provide an overview of lepton flavor violation from a theoretical perspective, both using the effective field theory framework and a variety of concrete models, motivated, for example, by the observation of neutrino masses. We also discuss non-standard signatures such as light-boson emission and flavor violation by more than one unit, highlighting challenges and opportunities at future facilities.
Charged Lepton Flavor Violation (CLFV) processes are transitions involving electrons, muons, or tau leptons that do not preserve lepton family numbers, and they provide model-independent probes of new physics beyond the Standard Model. The Mu2e experiment at Fermilab will search for the CLFV neutrino-less muon-to-electron conversion in the presence of aluminum nuclei, through the detection of...
The Belle II experiment has collected a 424 fb$^{-1}$ sample of $e^+e^-$ collisions produced by the asymmetric SuperKEKB collider. Ninety percent of the sample is at the $\Upsilon(4S)$ resonance, which decays to $B$-meson pairs. The predecessor experiment, Belle, collected nearly 1$~$ab$^{-1}$ of data from 1999-2010, three-quarters of which was at the $\Upsilon(4S)$. From these $\Upsilon(4S)$...
In this talk I review recent perturbative and non-perturbative developments in Heavy Quark Effective Theory (HQET).
In light of the recent branching fraction measurement of $B^{+}\to K^{+}\nu\bar{\nu}$-decay and its deviation from the SM expectation, we analyze the prospect of an axion-like particle (ALP) as the cause of such a departure. We assume a long-lived ALP with a mass of the order of a pion that predominantly decays to two photons. We assess the scenario where the ALP decay length is several meters...
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 NA62 experiment at CERN is a multi-purpose high-intensity kaon decay experiment, and carries out a broad rare-decay and...
We present the most recent $BABAR$ searches for reactions that could
simultaneously explain the presence of dark matter and the
matter-antimatter asymmetry in the Universe. This scenario predicts
exotic $B$-meson decays of the kind $B\to\psi_{D} {\cal B}$, where
$\cal{B}$ is an ordinary matter baryon (proton, $\Lambda$, or
$\Lambda_c$) and $\psi_D$ is a dark-sector anti-baryon,...
Heavy meson decays with missing energy in final state offer interesting avenues to search for light dark matter (DM) particles. In this context, we show that such DM interactions also affect lifetime difference in neutral meson-antimeson mixing. We consider general dimension-six effective quark interactions involving a pair of light DM fields, and calculate their contributions to lifetime...
Recent results on open heavy flavour and charmonium production from ATLAS experiment with Run-2 data are presented. This covers the double differential measurements of J/ψ and ψ(2S) production, D mesons and B+ production at √s=13 TeV
ATLAS has used the W and Z boson production processes to perform a range of precision measurements of SM parameters. The recoil of the Z-boson is sensitive to quark and gluon emissions and is used to determine the strong coupling constant in a novel approach. The production rate of Z+jet events with large missing transverse momentum is used to measure the decay width of the Z boson decaying to...
LHCb has collected the world's largest sample of charmed hadrons. This sample is used to measure the $D^0 -\overline{D}^0$ mixing, to search for rare decays and for $C\!P$ violation, and to perform precise measurements of properties and production of known charmed mesons and baryons. New measurements of several decay modes are presented, along with prospects for the sensitivity at the LHCb upgrades.
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. Direct $C\!P$ violation is searched for in $D^0\to K^0_{\rm S}K^0_{\rm S}$ decays and $D$-meson decays to a four-body final...
The 12 GeV Continuous Electron Beam Accelerator Facility (CEBAF) at JLab allows the study of J/ψ photoproduction and some higher-mass charmonium states at their thresholds, starting from 8.2 GeV. In this regime, the reaction amplitude is dominated by its real part (in contrast to the high-energy case) and contains important information about the interactions of the c-cbar pair with the proton...
Considering QCD in the limit of the number of colors $N_c$ being large provides important constraints on the interactions between baryons. These constraints are particularly valuable when the available data is too limited to accurately determine the interactions. In particular, while symmetry-preserving nucleon-nucleon interactions are constrained from a large amount of scattering data,...
CEBAF delivers the world’s highest intensity and highest precision multi-GeV electron beams and has been do so for more than 25 years. In Fall 2017, with the completion of the 12 GeV upgrade and the start of the 12 GeV science program, a new era at the Laboratory began. The 12 GeV era is now well under way and many experimental results are delivered from the three Halls A, B, and C that...
The Sigma+ -> p mu+ mu- decay is observed for the first time at the
LHCb experiment.
This is a flavour changing neutral current sensitive to physics beyond
the Standard Model, which could modify it's properties.
In particular the HyperCP experiment years ago presented an evidence of
this decay with a hint of a possible unknown intermediate particle.
This was excluded by LHCb already in...
The NA62 experiment at CERN collected the world's largest dataset of charged kaon decays in 2016-2018, leading to the first measurement of the branching ratio of the ultra-rare $K^+ \rightarrow \pi^+ \nu \bar\nu$ decay, based on 20 candidates. In this talk NA62 reports new results from the analyses of rare kaon and pion decays, using data samples collected in 2017-2018.
A sample of $K^+...
KOTO is the dedicated experiment to study the CP-violating decay $K_L^0 \to \pi^0 \nu \overline{\nu}$. This decay is sensitive to New Physics because its branching ratio is predicted to be $3 \times 10^{-11}$ with only 2\% theoretical uncertainty. By using the data collected in 2021, we have set the worldwide best limit on the branching ratio of this decay to be $2.0 \times 10^{-9}$ at the 90%...
The muon's anomalous magnetic moment is now known with a precision of 0.19 ppm with the latest run-2 and run-3 results of the Fermilab g-2 experiment. Further improvement in the precision of the experimental result is expected in the near future as the analysis of the final, subsequent run's 4, 5 and 6 are underway. On the theoretical side, the largest source of uncertainty in the 0.37 ppm...
The Fermilab Muon g-2 Experiment measured the muon magnetic moment anomaly to a precision of 200 parts per billion (ppb), after combining data from 2019 and 2020 with those from 2018. It involves high-precision measurements of the anomalous muon spin precession frequency $\omega_a$, as well as the magnetic field experienced by the muons. $\omega_a$ is measured with polarized muons decaying in...
A dedicated measurement of additional radiation in $e^+e^- \to \mu^+\mu^-\gamma$ and $e^+e^- \to \pi^+\pi^-\gamma$ initial-state-radiation events is presented using the full $BABAR$ data sample. For the first time results are presented at next-to-leading and next-to-next-to-leading order, with one and two additional photons, respectively, for radiation from the initial and final states. The...
The MUon proton Scattering Experiment (MUSE) simultaneously measures elastic electron-proton and muon-proton scattering using the PiM1 beam line at Paul Scherrer Institute in Villigen, Switzerland. Using both positive and negative beam polarities, MUSE will extract the proton charge radius by scattering off a liquid hydrogen target and contribute precise data to the investigation of the proton...
The MUSE experiment at the Paul Scherrer Institute is measuring elastic lepton-proton scattering cross sections in a four-momentum transfer range from Q2 of approximately 0.002 to 0.08 GeV2 using positively and negatively charged electrons and muons. The extraction of the Born cross sections from the experimental data requires radiative corrections. Estimates of the instrumental uncertainties...
I will provide a discussion of open questions surrounding neutrinos and how they connect to particle physics at large. I specifically, will also provide a review of the various low-energy experimental anomalies.
Neutrinos are central to many questions in particle physics, nuclear physics, and cosmology. I will give an overview of what we have learned about neutrino properties, their masses, their mixings, and their symmetries from experiments and what we have to look forward to from future experiments.
I discuss recent and imminent progress in the computation of the nuclear matrix elements that govern neutrinoless double-beta decay. Lattice QCD, effective field theory, and ab initio nuclear structure all play a role in those computations. Bayesian model mixing promises to produce a reliable uncertainty estimate for the computed matrix elements.
The Standard Model of Particle Physics explains many natural phenomena yet remains incomplete. Leptoquarks (LQs) are hypothetical particles predicted to mediate interactions between quarks and leptons, bridging the gap between the two fundamental classes of particles. Vectorlike quarks (VLQs) lie at the heart of many extensions seeking to address the Hierarchy Problem, as they can naturally...
Supersymmetry (SUSY) provides elegant solutions to several problems in the Standard Model, and searches for SUSY particles are an important component of the LHC physics program. This talk will present the latest results from SUSY searches conducted by the ATLAS experiment. The searches target multiple final states and different assumptions about the decay mode of the produced SUSY particles,...
With the large datasets on 𝑒+𝑒−-annihilation at the 𝐽/𝜓 and 𝜓(3686) resonances collected at the BESIII experiment, multi-dimensional analyses making use of polarization and entanglement can shed new light on the production and decay properties hyperon-antihyperon pairs. In a series of recent studies performed at BESIII, significant transverse polarization of the (anti)hyperons has been...
Hyperons play important role in the study of non-perturbative Quantum Chromodynamics. Hyperon-nucleon scattering experiments and hypernuclear spectroscopy provide much needed experimental constraints on poorly known low-energy parameters of the hyperon-nucleon interaction, such as scattering lengths, that are needed in the calculations of the properties of neutron stars. Measurements of...
This presentation will explore recent experimental findings in the domain of charmonium decays, encompassing four independent measurements conducted at BESIII. 1) Utilizing 27B psi(3686) events collected with the BESIII detector, various hc decays have been sought and measured. The decay channel hc -> 3(pi+pi-)pi0 has been observed for the first time, with strong evidence of hc -> 2(pi+...
PIONEER is a next-generation precision experiment proposed at Paul Scherrer Institute, Switzerland, to perform high precision measurements of rare pion decays. The measurement of the charged pion branching ratio R$_{e/μ}$ = Γ(π+→e+ν(γ) / Γ(π+→ μ+ν(γ) for pion decays to positrons relative to muons is extremely sensitive to a wide variety of new physics effects. At present, the Standard Model...