Thu·Jan 11, 2024Thursday·January 11, 2024

1. 01*

   Results of the MAJORANA DEMONSTRATOR's Search for Neutrinoless Double Beta Decay

   David J. Tedeschi (for the MAJORANA Collaboration)🇺🇸

   The MAJORANA DEMONSTRATOR recently concluded its search for neutrinoless double-beta decay. The experiment operated an array of up to 40.4 kg of germanium detectors, 27 kg of which were isotopically enriched in 76Ge and housed inside a compact shield consisting of lead and copper at the Sanford Underground Research Facility (SURF) in Lead, SD. The experiment achieved a world leading energy resolution of 0.12% FWHM at 2039 keV, one of the lowest background rates in the region of the 0vBB Q-value, 15.7 +1.4 -1.3 cnts/(FWHM t y), and set a 0vBB half-life limit of T_1/2 > 8.3x10^25 yrs based on its full active exposure of 65 kg yr, resulting in limits on the effective neutrino mass of mBB < 113-269 meV.

   nucl-exAIP Conf.Proc.(2024)·0 citations
2. 02*

   Insight into Emergence of Hadron Mass from $\text{boldmath}{N}^{\ast }$ Electroexcitation Amplitudes

   V.I. Mokeev🇺🇸 · D.S. Carman🇺🇸

   The emergence of hadron mass represents one of the most challenging and still open problems in contemporary hadron physics. The results on the nucleon resonance electroexcitation amplitudes available from the CLAS data on $\pi N$ and ${\pi }^{+}{\pi }^{-}p$ electroproduction analyzed within the continuum Schwinger method open up a new avenue for gaining insight into the strong interaction dynamics that are responsible for the generation of the dominant part of hadron mass. Future prospects of these studies in experiments of the 12-GeV era with CLAS12 and after a potential increase of the CEBAF energy up to 22 GeV will offer a unique opportunity to explore the full range of distances where the dominant part of hadron mass and $N^{\ast }$ structure emerge from QCD.

   nucl-exhep-phNuovo Cim.C(2024)·4 citations
3. 03*

   Exploring Electromagnetic Field Effects and Constraining Transport Parameters of QGP using STAR BES-II data

   Aditya Prasad Dash🇺🇸

   Heavy-ion collisions undergo various stages in their evolution and it is crucial to disentangle the initial- and final-stage effects. In this work, we report measurements of two types of observables: (i) charge-dependent directed flow ($\Delta v_1$), which is sensitive to the initial ultra-strong electromagnetic fields, and (ii) flow correlations, such as $r_n(\eta )$ which is sensitive to the initial longitudinal de-correlation, and correlations among flow harmonics. These measurements contribute to constraining the initial state of the collisions, and through a comprehensive beam energy scan, we gain significant insights into the system evolution in the presence of initial spatial asymmetry and electromagnetic fields.

   nucl-exhep-exEPJ Web Conf.(2024)·3 citations
4. 04*

   Light Hypernuclei Production in Au+Au Collisions at $\sqrt{s_{NN}}=$ 3 GeV within Thermodynamic Approach

   M. Kozhevnikova🇷🇺 · Yu. B. Ivanov🇷🇺

   Simulations of the $\Lambda$-hyperon and light-hypernuclei production in Au+Au collisions at $\sqrt{s_{NN}}=$ 3 GeV were performed within updated Three-fluid Hydrodynamics-based Event Simulator Extended by UrQMD (Ultra-relativistic Quantum Molecular Dynamics) final State interactions (THESEUS). The light (hyper)nuclei are treated thermodynamically, i.e. they are considered on the equal basis with hadrons. The only additional parameter is related to the late freeze-out that imitates the afterburner stage for the light (hyper)nuclei because the UrQMD is not able to dynamically treat them. The calculation of hypernuclei production is completely similar to that of light nuclei. The hypernuclei results are compared with recent STAR data. It is found that the calculated midrapidity ${}_{\Lambda }^3$H/$\Lambda$ ratio falls within the error bars of the experimental point. It is remarkable that large difference between the $t/p$ and ${}_{\Lambda }^3$H/$\Lambda$ ratios is reproduced without any additional parameters. Rapidity distributions of ${}_{\Lambda }^3$H/$\Lambda$ and ${}_{\Lambda }^4$He/$\Lambda$ ratios are predicted. Midrapidity mean transverse momenta of protons, $\Lambda$s and light (hyper)nuclei in central collisions well agree with the data. The calculated directed flow also reasonably well reproduces of the data.

   ↳ nucl-thhep-phnucl-exPRC(2024)·7 citations
5. 05*

   Deciphering yield modification of hadron-triggered semi-inclusive recoil jets in heavy-ion collisions

   Yang He🇨🇳 · Maowu Nie🇨🇳 · Shanshan Cao🇨🇳 · Rongrong Ma🇺🇸 · Li Yi🇨🇳 · Helen Caines🇺🇸

   In relativistic heavy-ion collisions, a hot and dense state of matter, called the Quark-Gluon Plasma (QGP), is produced. Semi-inclusive jets recoiling from trigger hadrons of high transverse momenta ($p_{\mathrm{T}}$) can serve as an effective probe of the QGP properties, as they are expected to experience jet quenching when traversing the QGP. Recent experimental results on the ratio of recoil jet yields normalized by the trigger counts in heavy-ion collisions to that in $p$+$p$ collisions ($I_{\mathrm{AA}}$) pose an unexpected challenge in its interpretation. It is observed that $I_{\mathrm{AA}}$ rises with the jet $p_{\mathrm{T}}$ and possibly exceeds unity at high $p_{\mathrm{T}}$, while traditionally it is expected that jet quenching would lead to $I_{\mathrm{AA}}<1$. To address this challenge, we utilize the Linear Boltzmann Transport (LBT) model to simulate jet transport in the QGP, and study the effect of jet quenching for high-$p_{\mathrm{T}}$ triggers and recoil jets separately on $I_{\mathrm{AA}}$. We find that the quenching of the colored triggers alone is responsible for the rising trend and larger-than-unity value observed experimentally.

   ↳ nucl-thnucl-exPLB(2024)·13 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.