Tue·Aug 1, 2023Tuesday·August 1, 2023

1. 01*

   Probing gluon distributions with $D^0$ production at the EicC

   Daniele Paolo Anderle🇨🇳 · Aiqiang Guo🇨🇳 · Felix Hekhorn🇮🇹 · Yutie Liang🇨🇳 · Yuming Ma🇨🇳 · Lei Xia🇨🇳 · Hongxi Xing🇨🇳 · Yuxiang Zhao🇨🇳

   The Electron-Ion Collider in China (EicC) has been proposed to study the inner structure of matter and fundamental laws of strong interactions. In this paper, we will present a conceptual design of the tracking system based on the state-of-art silicon detector and Micro-Pattern Gaseous Detector at the EicC and demonstrate that it will enable us to reconstruct charm hadron with good significance, hence study gluonic parton distribution functions in nucleons and nuclei, as well as gluon helicity distributions. The impact study using reweighting techniques shows that the impact of the EicC will be mainly in the large $x$ region. It complements similar physics programs at the Electron-Ion Collider at Brookhaven National Laboratory.

   nucl-exPRD(2024)·8 citations
2. 02*

   Multiplicity dependence of intra-jet properties in pp collisions at $\sqrt{s}$ = 13 TeV with ALICE

   Debjani Banerjee (for the ALICE Collaboration)🇮🇳

   Recent results in high-multiplicity pp collisions show features similar to those that are associated with the formation of a quark$-$gluon plasma in heavy-ion collisions. Investigating the modification of the intra-jet properties as a function of event multiplicity in pp collisions can provide deeper insight into the nature of these effects. We will present the recent measurements of multiplicity dependence of charged-particle jet properties (average charged particle multiplicity and fragmentation functions) for leading charged-particle jets. Jets are reconstructed using anti-$k_{\mathrm{T}}$ jet finding algorithm with radius parameter $R$ = 0.4 in the jet $p_{\mathrm{T}}$ range from 5$-$110 GeV/$c$ at midrapidity in pp collisions at $\sqrt{s}$ = 13 TeV with ALICE.

   nucl-exSpringer Proc.Phys.(2024)·0 citations
3. 03*

   Precise determination of ${}^{210}$Pb $\beta$ Decay Spectrum at 0 keV and its Implication to Theoretical Calculations

   Shuo Zhang🇨🇳 · Xavier Mougeot🇫🇷 · Hao-Ran Liu🇨🇳 · Ke Han🇨🇳 · Tao Sun🇨🇳 · Wen-Tao Wu🇨🇳 · Robin Cantor🇺🇸 · Jing-Kai Xia🇨🇳 · Jun-Cheng Liang🇨🇳 · Fu-You Fan🇨🇳 · Bing-Jun Wu🇨🇳 · Le Zhang🇨🇳 and 3 other authors

   The atomic exchange effect will lead to a significant increase in the probability density of $\beta$ decays below a few keV. This effect is very important for scientific experiments that performed by low-energy electron spectroscopy measurements. However, the atomic exchange effect involves multi-electron interactions, especially for a system with 82 electrons such as lead. Different parameters will lead to different trends in the energy spectrum predicted by the theory, so it is urgent to carry out experimental measurements to provide parameter limits for the theory. The probability increase brought about by the atomic exchange effect is most obvious near 0keV, and the $\beta$ energy spectrum is accurately measured near this energy point, so as to provide constraints for the physical model of atomic exchange. However, it is extremely difficult to measure the $\beta$ energy spectrum at 0keV due to the limitations of electronic noise and internal conversion effects. The excited decay path of ${}^{210}$Pb was taken as the observation object,by measuring the total energy spectrum of $\beta$ rays and cascaded gamma rays, the precise measurement of the $\beta$ energy spectrum near 0keV has been completed. The analysis of the $\beta$ energy spectrum of ${}^{210}$Pb gives the following conclusions. The experimental results first verified the theory that the exchange effect causes the probability increase at the low energy end near 0keV. At the same time, the experimental results are higher than the existing predictions of the atomic exchange effect. At least for Pb element, all the electron shells have played a role in improving the probability density of the low end of the $\beta$ energy spectrum. This discovery will promote the theoretical calculation of the $\beta$ energy spectrum of ${}^{214}$Pb, at the same time, it also indicates that the reactor neutrinos have a higher probability density at the omnipotent end.

   nucl-exnucl-th2 citations
4. 04*

   Cosmophysical aspects of relativistic nuclear fragmentation

   A.A. Zaitsev🇷🇺 · N. Marimuthu · D.A. Artemenkov🇷🇺 · P.I. Zarubin🇷🇺 · N.G. Peresadko · V.V. Rusakova

   The status of the study of multiple fragmentation of 950 MeV per nucleon Kr nuclei in a nuclear track emulsion aimed at determining the contributions of 2$\alpha$ decays of ${}^8$Be, the Hoyle 3$\alpha$ state, and the search for a 4$\alpha$ particle condensate state, is presented. In events with the production of few relativistic fragments of He and H, the possibility of estimating the multiplicity of neutrons in the fragmentation cone of a projectile nucleus is studied. For the planar component of neutron transverse momenta estimated from the angles of observed secondary stars, the Rayleigh distribution parameter was 35 $\pm$ 7 MeV/$c$. The importance of such events for the interpretation of cosmophysical observations is noted.

   nucl-exPhys.Atom.Nucl.(2023)·2 citations
5. 05*

   Search for tri-nucleon decays of ${}^{76}$Ge in GERDA

   GERDA collaboration: M. Agostini🇬🇧 · A. Alexander🇬🇧 · G. Araujo🇨🇭 · A.M. Bakalyarov🇷🇺 · M. Balata🇮🇹 · I. Barabanov🇷🇺 · L. Baudis🇨🇭 · C. Bauer🇩🇪 · S. Belogurov🇷🇺 · A. Bettini🇮🇹 · L. Bezrukov🇷🇺 · V. Biancacci🇮🇹 and 101 other authors

   We search for tri-nucleon decays of ${}^{76}$Ge in the dataset from the GERmanium Detector Array (GERDA) experiment. Decays that populate excited levels of the daughter nucleus above the threshold for particle emission lead to disintegration and are not considered. The ppp-, ppn-, and pnn-decays lead to ${}^{73}$Cu, ${}^{73}$Zn, and ${}^{73}$Ga nuclei, respectively. These nuclei are unstable and eventually proceed by the beta decay of ${}^{73}$Ga to ${}^{73}$Ge (stable). We search for the ${}^{73}$Ga decay exploiting the fact that it dominantly populates the 66.7 keV ${}^{73m}$Ga state with half-life of 0.5 s. The nnn-decays of ${}^{76}$Ge that proceed via ${}^{73m}$Ge are also included in our analysis. We find no signal candidate and place a limit on the sum of the decay widths of the inclusive tri-nucleon decays that corresponds to a lower lifetime limit of 1.2x10${}^{26}$ yr (90% credible interval). This result improves previous limits for tri-nucleon decays by one to three orders of magnitude.

   nucl-exEPJC(2023)·10 citations
6. 06*

   Comment on "Electromagnetic form factors for nucleons in short-range correlations": arXiv:2305.13666

   Dmitry N. Kim (1) · Or Hen (2) · Gerald A. Miller (1) · E. Piasetzky (3) · M. Strikman (4) · L. Weinstein (5) ((1) Department of Physics, University of Washington, Seattle, WA 98195-1560, USA (2) Department of Physics, Massachusetts Institute of Technology, Cambridge Massachusetts 02139, USA (3) School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel (4) Department of Physics, The Pennsylvania State University, Norfolk, Virginia, 23529, USA (5) Department of Physics, Old Dominion University, Norfolk, Virginia, 23529, USA)

   The relationship between medium modifications of nuclear quark structure functions and medium modifications of elastic electromagnetic form factors is shown to be model dependent.

   ↳ nucl-thhep-exhep-phnucl-ex1 citation
7. 07*

   Bremsstrahlung Cross Section with Polarized Beams for Luminosity Determination at the EIC

   Dhevan Gangadharan🇺🇸

   The bremsstrahlung cross section is calculated at leading order for polarized beams of electrons and ions, which is needed for luminosity measurements at the upcoming Electron Ion Collider (EIC). Analytic expressions, differential in the emitted photon energy and polar angle, are derived. The component of the cross section which depends on the beam polarizations is found to be highly suppressed with respect to the unpolarized Bethe-Heitler component, owing to the low $q^2$ that characterizes the bremsstrahlung process.

   ↳ hep-phhep-exnucl-exnucl-thEPJA(2023)·1 citation
8. 08*

   Quantum local-equilibrium state with fixed multiplicity constraint and Bose-Einstein momentum correlations

   M.D. Adzhymambetov🇺🇦 · S.V. Akkelin🇺🇦 · Yu.M. Sinyukov🇺🇦

   The one- and two-boson momentum spectra are derived in the quantum local-equilibrium canonical ensemble of noninteracting bosons with a fixed particle number constraint. We define the canonical ensemble as a subensemble of events associated with the grand-canonical ensemble. Applying simple hydro-inspired parametrization with parameter values that correspond roughly to the values at the system's breakup in $p+p$ collisions at the LHC energies, we compare our findings with the treatment which is based on the grand-canonical ensembles where mean particle numbers coincide with fixed particle numbers in the canonical ensembles. We observe a significantly greater sensitivity of the two-particle momentum correlation functions to fixed multiplicity constraint compared to one-particle momentum spectra. The results of our analysis may be useful for interpretation of multiplicity-dependent measurements of $p+p$ collision events.

   ↳ hep-phhep-exnucl-exnucl-thPRD(2023)·3 citations
9. 09*

   Multi-particle correlations, cumulants, and moments sensitive to fluctuations in rare-probe azimuthal anisotropy in heavy ion collisions

   Abraham Holtermann🇺🇸 · Jacquelyn Noronha-Hostler🇺🇸 · Anne M. Sickles🇺🇸 · Xiaoning Wang🇺🇸

   Correlations of two or more particles have been an essential tool for understanding the hydrodynamic behavior of the quark-gluon plasma created in ultra-relativistic nuclear collisions. In this paper, we extend that framework to introduce a mathematical construction of multi-particle correlators that utilize correlations between arbitrary numbers of particles of interest (e.g. particles selected for their strangeness, heavy flavor, and conserved charges) and inclusive reference particles to estimate the azimuthal anisotropies of rare probes. To estimate the fluctuations and correlations in the azimuthal anisotropies of these particle of interest, we use these correlators in a system of cumulants, raw moments, and central moments. We finally introduce two classes of observables that can compare the fluctuations in the azimuthal anisotropies of particles of interest with reference particles at each order.

   ↳ nucl-thnucl-exPRC(2023)·14 citations
10. 10*

    Impact of NNLO QED corrections on lepton-proton scattering at MUSE

    T. Engel🇩🇪 · F. Hagelstein🇨🇭 · M. Rocco🇨🇭 · V. Sharkovska🇨🇭 · A. Signer🇨🇭 · Y. Ulrich🇬🇧

    We present the complete next-to-next-to-leading order (NNLO) pure pointlike QED corrections to lepton-proton scattering, including three-photon-exchange contributions, and investigate their impact in the case of the MUSE experiment. These corrections are computed with no approximation regarding the energy of the emitted photons and taking into account lepton-mass effects. We contrast the NNLO QED corrections to known next-to-leading order corrections, where we include the elastic two-photon exchange (TPE) through a simple hadronic model calculation with a dipole ansatz for the proton electromagnetic form factors. We show that, in the low-momentum-transfer region accessed by the MUSE experiment, the improvement due to more sophisticated treatments of the TPE, including inelastic TPE, is of similar if not smaller size than some of the NNLO QED corrections. Hence, the latter have to be included in a precision determination of the low-energy proton structure from scattering data, in particular for electron-proton scattering. For muon-proton scattering, the NNLO QED corrections are considerably smaller.

    ↳ hep-phnucl-exnucl-thEPJA(2023)·15 citations
11. 11*

    A Formalism for Extracting Track Functions from Jet Measurements

    Kyle Lee🇺🇸 · Ian Moult🇺🇸 · Felix Ringer🇺🇸 · Wouter J. Waalewijn🇳🇱

    The continued success of the jet substructure program will require widespread use of tracking information to enable increasingly precise measurements of a broader class of observables. The recent reformulation of jet substructure in terms of energy correlators has simplified the incorporation of universal non-perturbative matrix elements, so called "track functions", in jet substructure calculations. These advances make it timely to understand how these universal non-perturbative functions can be extracted from hadron collider data, which is complicated by the use jet algorithms. In this paper we introduce a new class of jet functions, which we call (semi-inclusive) track jet functions, which describe measurements of the track energy fraction in identified jets. These track jet functions can be matched onto the universal track functions, with perturbatively calculable matching coefficients that incorporate the jet algorithm dependence. We perform this matching, and present phenomenological results for the charged energy fraction in jets at the LHC and EIC/HERA at collinear next-to-leading logarithmic accuracy. We show that higher moments of the charged energy fraction directly exhibit non-linear Lorentzian renormalization group flows, allowing the study of these flows with collider data. Our factorization theorem enables the extraction of universal track functions from jet measurements, opening the door to their use for a precision jet substructure program.

    ↳ hep-phhep-exnucl-exnucl-thJHEP(2024)·26 citations
12. 12*

    Measurement of ${}^3$He${}^{++}$ Polarization at 5.3 MeV via Scattering with an Unpolarized ${}^4$He Target

    Charles Epstein · Richard Milner🇺🇸

    Since 2012, a BNL-MIT collaboration has worked to develop a polarized ${}^3$He ion source for the Relativistic Heavy Ion Collider (RHIC) using the existing Electron Beam Ionization Source (EBIS). ${}^3$He atoms are polarized using optical pumping at high field and injected as neutral atoms into the EBIS. A critical issue is the demonstration that the polarization of the extracted ${}^3$He${}^{++}$ ions from the source is high. In 2014, a concept to measure the nuclear polarization was developed in this paper. Since then, the development of the polarized ${}^3$He ion source has progressed, the polarimeter is under construction, and the demonstration experiment is expected to take place in the next several years.

    ↳ physics.ins-detnucl-ex1 citation

* 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.