Conveners
Poster Session
- Wolfgang Gradl
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Yasemin Schelhaas (JGU Mainz)17/10/2023, 16:30Poster
The anomalous magnetic moment of the muon $a_\mu=(g_\mu-2)/2$ is one of the most precisely measured quantities in modern physics. However, there is a sizable discrepancy between the Standard Model (SM) prediction of the Muon $g-2$ Theory Initiative and the experimental average of the latest direct measurements at BNL and FNAL. This discrepancy is known as the Muon $g-2$ puzzle. For the SM...
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Thomas Lenz (JGU Mainz)17/10/2023, 16:35Poster
The hadronic vacuum polarization is an important contribution to the running QED coupling constant at the $Z$ pole, $\alpha_\mathrm{QED}(M_Z^2)$, and the anomalous magnetic moment of the muon $a_\mu = (g_\mu - 2) / 2$. Both quantities allow for precision tests of the Standard Model (SM). Their theoretical uncertainties are dominated by hadronic contributions. Experimental inputs, like the...
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Nikolai in der Wiesche (University of Münster)17/10/2023, 16:38Poster
The 10 billion J/\psi decays collected with the BESIII experiment offer a unique opportunity to investigate the decays of \eta and \eta^\prime mesons produced in the radiative and hadronic J/\psi \to \gamma \eta^{(\prime)}, \phi \eta^{(\prime)} transitions. Using this clean production mechanism, the BESIII experiment is making important contributions to
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precision studies of the strong and... -
Viacheslav Tsaran (JGU Mainz)17/10/2023, 16:41Poster
Coherent pion photoproduction on nuclei is an efficient tool for studying nucleon density and determining neutron skin thickness. However, a reliable description of pion scattering and other medium effects is needed for these purposes. We build a universal model describing both pion scattering and photoproduction on spin-zero nuclei within the same framework. We develop second-order momentum...
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Mr Chunjiang Shi (Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, P.R. China)17/10/2023, 16:44Poster
By extracting the transition amplitudes, we give the first lattice QCD prediction of the two-body decay partial widths of the $1^{-+}$ charmoniumlike hybrid $\eta_{c1}$. Given the calculated mass value $m_{\eta_{c1}}=4.329(36)$ GeV, the $\eta_{c1}$ decay is dominated by the open charm modes $D_1\bar{D}$, $D^*\bar{D}$ and $D^*\bar{D}^*$ with partial widths of $258(133)$ MeV, $88(18)$ MeV and...
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Sungwook Choi (Korea University)17/10/2023, 16:47Poster
K$^*$(892) production from nuclei provides a crucial test ground for exploring possible in-medium modification of K$^*$(892) properties. Recently, we collected high-statistics datasets for $^{12}$C(K$^-$,p) reactions at 1.8 GeV/c. We performed this measurement simultaneously in the J-PARC E42 run for the H-dibaryon search. The HypTPC helps reconstruct the K$^*$(892)-> K$^0_{s}\pi^-$ decay,...
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Jenny Taylor (GSI)17/10/2023, 16:50Poster
Hyperon-hyperon and hyperon-nucleon interaction potentials are important to study in order to understand the strangeness content of neutron star cores. Strangeness is energetically favorable to be created in such dense matter since it lowers the Fermi pressure but the resulting maximum allowed mass is lower than observed masses. This could be explained by including strongly repulsive hyperon -...
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Saskia Plura (JGU Mainz)17/10/2023, 16:53Poster
The search for Dark Matter is an integral part of New Physics searches, however, Dark Matter has yet to be observed directly. Theoretical models provide a large parameter space for Dark Matter and allow for different properties of the particles. Models incorporating so-called portal interactions, where Dark Matter interacts with Standard Model particles through a mediator particle, are of...
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Max Lellmann (JGU Mainz)17/10/2023, 16:56Poster
The anomalous magnetic moment of the muon, $a_\mu = (g-2)_\mu/2$, is one of the most precisely measured observables of the Standard Model. However, its value shows a sizeable discrepancy to the Standard Model prediction. It is still under discussion whether this discrepancy is a hint for New Physics or a proof for the limited understanding of strong interaction at low energies. To get a better...
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Maurice Anderson17/10/2023, 16:59Poster
The $g-2$ puzzle describes a sizable discrepancy between the experimental measurements of the muon’s magnetic moment and the theoretical Standard Model prediction. In order to determine whether this observed deviation is a significant discovery of possible physics beyond the Standard Model, the uncertainty of the theoretical prediction must be reduced. The primary source of systematic error...
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Xiaoxuan Ding17/10/2023, 17:02Poster
I shall present a few recent measurements of charmonium decays at BESIII in this talk. It will include i) based on 448M psi(3686) events collected with theBESIII detector, the decay psi(3686) -> phi Ks0 Ks0 is observed for the first time. And the branching fraction is measured with considering the interference between psi(3686) and continuum production; ii) using an electron positron collision...
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Hong-Fei Shen (IHEP)17/10/2023, 17:05Poster
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...
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Sebastian Ciupka (HISKP, Bonn)17/10/2023, 17:08Poster
It is experimentally and theoretically challenging to determine the exact number of exited nucleon states and their properties, since the short lifetime of these exited states leads to strongly overlapping resonances. Using a polarized beam, a polarized target or using the polarization of the recoil nucleon helps to measure single or double polarization observables, that are needed for an...
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Cornelis J.G. Mommers17/10/2023, 17:11Poster
We propose a novel direct search experiment for X17 using the photon-deuteron reaction $\gamma d \to e^+ e^- pn$. X17 is a hypothetical particle conjectured by the ATOMKI collaboration to explain anomalous signals around 17 MeV in excited ${}^8$Be, ${}^4$He and ${}^{12}$C nuclear decays via internal pair creation. It has been subject to a global experimental and theoretical research program....
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Vladyslava Sharkovska (Paul Scherrer Institute)17/10/2023, 17:14Poster
In this poster presentation, I will discuss the two-photon exchange (TPE) as a crucial higher-order contribution to lepton-proton scattering and the theory of light muonic atoms. In particular, I will focus on the proton polarizability contribution as the dominant uncertainty in the theory prediction of the Lamb shift and the hyperfine splitting (HFS) in muonic hydrogen ($\mu$H). It is...
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Tommaso Vittorini (Università di Genova)17/10/2023, 17:17Poster
A(i)DAPT is a program which aims to utilize AI techniques, in particular generative modeling, to support Nuclear and High Energy Physics experiments. Its purpose is to extract physics directly from data in the most complete manner possible. Generative models such GANs and Normalizing Flows are employed to capture the full correlations between particles in the final state of nuclear reactions....
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Viktoriia Ermolina (Johannes Gutenberg University Mainz)17/10/2023, 17:20Poster
We present results for the charged and neutral pion polarizabilities, obtained through a dispersive analysis of the photon-photon fusion process. This analysis is motivated by the current and future measurements at COMPASS and JLab (Hall D). While the predictions based on the unsubtracted dispersion relation, considering only the pion-pole left-hand cut, provide a relatively good qualitative...
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Aleksandr Pustyntsev (Johannes Gutenberg University of Mainz)17/10/2023, 17:23Poster
Axions and axion-like particles (ALPs) are one of the most widely discussed extensions of the Standard Model when it comes to the strong CP problem and dark matter candidates. Current experiments are focused on the indirect searches of invisible pseudoscalars in a wide parameter range. In this paper we investigate limits on ALP mass, and its couplings to photons and leptons from 3-photon...
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Julian Parrino (Johannes Gutenberg-Universität)17/10/2023, 17:26Poster
Lattice QCD (LQCD) has proven to be an important tool in understanding the tension between the experimental value for the anomalous magnetic moment of the muon and its standard model prediction. The lattice gives an unique insight to the hadronic sector, which contributes the largest amount to the uncertainty of the theoretical prediction. The common method for evaluating the hadronic vacuum...
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Sotiris Pitelis (Johannes Gutenberg-Universität Mainz)17/10/2023, 17:29Poster
Spectroscopy experiments at the precision frontier allow us to study low-energy nuclear structure, test bound-state QED, refine fundamental constants, and potentially find New Physics. As the experimental uncertainties are continuously improved, theory predictions need to follow suit.
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The finite-size corrections to the spectra of hydrogen-like atoms are often expanded in terms of the moments...