Thu·Jul 20, 2023Thursday·July 20, 2023

1. 01*

   Charged Kaon Femtoscopy with Lévy Sources in $\sqrt{s_{\text{NN}}}$ = 200 GeV Au+Au Collisions at PHENIX

   László Kovács🇭🇺

   The PHENIX experiment measured Bose-Einstein quantum-statistical correlations of charged kaons in Au+Au collisions at $\sqrt{s_{\text{NN}}}$ = 200 GeV. The correlation functions are parametrized assuming that the source emitting the particles has a Lévy shape, characterized by the Lévy exponent $\alpha$ and the Lévy scale $R$. By introducing the intercept parameter $\lambda$, we account for the core-halo fraction. The parameters are investigated as a function of transverse mass. The comparison of the parameters measured for kaon-kaon with those measured from pion-pion correlation may clarify the connection of Lévy parameters to physical processes.

   nucl-exUniverse(2023)·6 citations
2. 02*

   Measurement of the 171Tm beta spectrum

   Frédéric Juget🇨🇭 · Maarten van Dijk🇨🇭 · Emilio Andrea Maugeri🇨🇭 · Maria Dorothea Schumann🇺🇸 · Stephan Heinitz🇨🇭 · Alexey Boyarsky🇳🇱 · Ulli Köster🇫🇷 · Lesya Shchutska🇨🇭 · Claude Bailat🇨🇭

   The beta spectrum of the main transition of the beta-decay of 171Tm was measured using a double focalizing spectrometer. The instrument was lately improved in order to reduce its low energy threshold to 34 keV. We used the spectrometer to measure the beta spectrum end-point energy of the main transition of 171Tm decay using the Kurie plot formalism. We report a new value of 97.60(38) keV, which is in agreement with previous measurements. In addition, the spectrum shape was compared with the xi-approximation calculation where the shape factor is equal to 1 and good agreement was found between the theory and the measurement at the 1% level.

   nucl-exphysics.ins-detAppl.Radiat.Isot.(2023)·1 citation
3. 03*

   Multiscale evolution of heavy flavor in the QGP

   G. Vujanovic · A. Angerami · R. Arora · S. A. Bass · S. Cao · Y. Chen · T. Dai · L. Du · R. Ehlers · H. Elfner · W. Fan · R. J. Fries and 43 other authors

   Shower development dynamics for a jet traveling through the quark-gluon plasma (QGP) is a multiscale process, where the heavy flavor mass is an important scale. During the high virtuality portion of the jet evolution in the QGP, emission of gluons from a heavy flavor is modified owing to heavy quark mass. Medium-induced radiation of heavy flavor is sensitive to microscopic processes (e.g. diffusion), whose virtuality dependence is phenomenologically explored in this study. In the lower virtuality part of shower evolution, i.e. when the mass is comparable to the virtuality of the parton, scattering and radiation processes of heavy quarks differ from light quarks. The effects of these mechanisms on shower development in heavy flavor tagged showers in the QGP is explored here. Furthermore, this multiscale study examines dynamical pair production of heavy flavor (via virtual gluon splittings) and their subsequent evolution in the QGP, which is not possible otherwise. A realistic event-by-event simulation is performed using the JETSCAPE framework. Energy-momentum exchange with the medium proceeds using a weak coupling recoil approach. Using leading hadron and open heavy flavor observables, differences in heavy versus light quark energy-loss mechanisms are explored, while the importance of heavy flavor pair production is highlighted along with future directions to study.

   ↳ hep-phnucl-exnucl-thPoS(2024)·0 citations
4. 04*

   A new metric improving Bayesian calibration of a multistage approach studying hadron and inclusive jet suppression

   W. Fan🇺🇸 · G. Vujanovic🇨🇦 · S. A. Bass🇺🇸 · A. Angerami🇺🇸 · R. Arora🇺🇸 · S. Cao🇨🇳 · Y. Chen🇺🇸 · T. Dai🇺🇸 · L. Du🇨🇦 · R. Ehlers🇺🇸 · H. Elfner🇩🇪 · R. J. Fries🇺🇸 and 43 other authors

   We study parton energy-momentum exchange with the quark gluon plasma (QGP) within a multistage approach composed of in-medium DGLAP evolution at high virtuality, and (linearized) Boltzmann Transport formalism at lower virtuality. This multistage simulation is then calibrated in comparison with high $p_T$ charged hadrons, D-mesons, and the inclusive jet nuclear modification factors, using Bayesian model-to-data comparison, to extract the virtuality-dependent transverse momentum broadening transport coefficient $\hat{q}$. To facilitate this undertaking, we develop a quantitative metric for validating the Bayesian workflow, which is used to analyze the sensitivity of various model parameters to individual observables. The usefulness of this new metric in improving Bayesian model emulation is shown to be highly beneficial for future such analyses.

   ↳ hep-phnucl-exnucl-thPRC(2024)·17 citations
5. 05*

   Lowest-order QED radiative corrections in unpolarized elastic electron-deuteron scattering beyond the ultra-relativistic limit for the proposed deuteron charge radius measurement at Jefferson Laboratory

   Jingyi Zhou🇺🇸 · Vladimir Khachatryan🇺🇸 · Igor Akushevich🇺🇸 · Haiyan Gao🇺🇸 · Alexander Ilyichev🇧🇾 · Chao Peng🇺🇸 · Stanislav Srednyak🇺🇸 · Weizhi Xiong🇨🇳

   Analogous to the well-known proton charge radius puzzle, a similar puzzle exists for the deuteron charge radius, $r_d$. There are discrepancies observed in the results of $r_d$, measured from electron-deuteron ($e-d$) scattering experiments, as well as from atomic spectroscopy. In order to help resolve the charge radius puzzle of the deuteron, the PRad collaboration at Jefferson Lab has proposed an experiment for measuring $r_d$, named DRad. This experiment is designed to measure the unpolarized elastic $e-d$ scattering cross section in a low-$Q^2$ region. To extract the cross section with a high precision, having reliable knowledge of QED radiative corrections is important. In this paper, we present complete numerical calculations of the lowest-order radiative corrections in $e-d$ scattering for the DRad kinematics. The calculations have been performed within a covariant formalism and beyond the ultra-relativistic approximation ($m_e^2\ll Q^2$). Besides, we present a systematic uncertainty on $r_d$ arising from higher-order radiative corrections, estimated based on our cross-section results.

   ↳ nucl-thnucl-exEPJA(2023)·2 citations
6. 06*

   Inverse problem in femtoscopic correlation functions: The $T_{cc}(3875{)}^{+}$ state

   M. Albaladejo🇪🇸 · A. Feijoo🇪🇸 · I. Vidaña🇮🇹 · J. Nieves🇪🇸 · E. Oset🇪🇸

   We study here the inverse problem of starting from the femtoscopic correlation functions of related channels and analyze them with an efficient tool to extract the maximum information possible on the interaction of the components of these channels, and the existence of possible bound states tied to this interaction. The method is flexible enough to accommodate non-molecular components and the effect of missing channels relevant for the interaction. We apply the method to realistic correlation functions for the $D^{\ast +}{D}^0$ and $D^{\ast 0}{D}^{+}$ channels derived consistently from the properties of the $T_{cc}(3875{)}^{+}$ and find that we can extract the existence of a bound state, its nature as a molecular state of the $D^{\ast +}{D}^0$ and $D^{\ast 0}{D}^{+}$ channels, the probabilities of each channel, as well as scattering lengths and effective ranges for the channels, together with the size of the source function, all of them with a relatively good precision.

   ↳ hep-phhep-exnucl-exnucl-thEPJA(2025)·31 citations
7. 07*

   Inclusion of $K\Lambda$ electroproduction data in a coupled channel analysis

   M. Mai🇺🇸 · J. Hergenrather🇺🇸 · M. Döring🇺🇸 · T. Mart🇮🇩 · Ulf-G. Meißner🇩🇪 · D. Rönchen🇩🇪 · R. Workman🇺🇸

   Exclusive electroproduction reactions provide an access to the structure of excited baryons. To extract electroproduction multipoles encoding this information, the Jülich-Bonn-Washington (JBW) analysis framework is extended to the analysis of differential cross sections in $K\Lambda$ electroproduction. This update enlarges the scope of previous coupled-channel analyses of pions and eta mesons, with photoproduction reactions as boundary condition in all analyzed electroproduction reactions. Polarization observables are predicted and compared to recent CLAS data. The comparison shows the relevance of these data to pin down baryon properties.

   ↳ nucl-thhep-phnucl-exEPJA(2023)·20 citations
8. 08*

   Development of Neutron Interferometer using Multilayer Mirrors and Measurements of Neutron-Nuclear Scattering Length with Pulsed Neutron Source

   Takuhiro Fujiie🇯🇵 · Masahiro Hino🇯🇵 · Takuya Hosobata🇯🇵 · Go Ichikawa🇯🇵 · Masaaki Kitaguchi🇯🇵 · Kenji Mishima🇯🇵 · Yoshichika Seki🇯🇵 · Hirohiko M. Shimizu🇯🇵 · Yutaka Yamagata🇯🇵

   This study entailed the successful deployment of a novel neutron interferometer that utilizes multilayer mirrors. The apparatus facilitates a precise evaluation of the wavelength dependence of interference fringes utilizing a pulsed neutron source. Our interferometer achieved an impressive precision of 0.02 rad within a 20-min of recording time. Compared to systems using silicon crystals, the measurement sensitivity was maintained even when using a simplified disturbance suppressor. By segregating beam paths entirely, we achieved successful measurements of neutron-nuclear scattering lengths across various samples. The values measured for Si, Al, and Ti were in agreement with those found in the literature, while V showed a disparity of 45%. This discrepancy may be attributable to impurities encountered in previous investigations. The accuracy of measurements can be enhanced further by mitigating systematic uncertainties that are associated with neutron wavelength, sample impurity, and thickness. This novel neutron interferometer enables us to measure fundamental parameters, such as the neutron-nuclear scattering length of materials, with a precision that surpasses that of conventional interferometers.

   ↳ physics.ins-detnucl-exPRL(2024)·7 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.