Fri·Jun 16, 2023Friday·June 16, 2023

1. 01*

   Femtoscopic correlation measurement with symmetric Lévy-type source at NA61/SHINE

   Barnabas Porfy (for the NA61/SHINE collaboration)🇭🇺

   Measuring quantum-statistical, femtoscopic (including final state interactions) momentum correlations with final state interactions in high-energy nucleus-nucleus collisions reveal the space-time structure of the particle-emitting source created. In this paper, we report NA61/SHINE measurements of femtoscopic correlations of identified pion pairs and describe said correlations based on symmetric Lévy-type sources in Ar+Sc collisions at 150A GeV/c. We investigate the transverse mass dependence of the Lévy-type source parameters and discuss their possible interpretations.

   nucl-exhep-exUniverse(2023)·11 citations
2. 02*

   Improved $S$-factor of the ${}^{12}$C(p,$\gamma$)${}^{13}$N reaction at $E=$320-620~keV and the 422~keV resonance

   J. Skowronski🇮🇹 · E. Masha🇩🇪 · D. Piatti🇮🇹 · M. Aliotta🇬🇧 · H. Babu · D. Bemmerer🇩🇪 · A. Boeltzig🇮🇹 · R. Depalo🇮🇹 · A. Caciolli🇮🇹 · F. Cavanna🇮🇹 · L. Csedreki · Z. Fülöp and 8 other authors

   The 12C(p,{\gamma})13N reaction is the onset process of both the CNO and Hot CNO cycles that drive massive star, Red and Asymptotic Giant Branch star and novae nucleosynthesis. The 12C(p,{\gamma})13N rate affects the final abundances of the stable 12,13C nuclides, with ramifications for meteoritic carbon isotopic abundances and the s-process neutron source strength. Here, a new underground measurement of the 12C(p,{\gamma})13N cross-section is reported. The present data, obtained at the Felsenkeller shallow-underground laboratory in Dresden (Germany), encompass the 320-620 keV center of mass energy range to include the wide and poorly constrained E = 422 keV resonance that dominates the rate at high temperatures. This work S-factor results, lower than literature by 25%, are included in a new comprehensive R-matrix fit, and the energy of the 1+ first excited state of 13N is found to be 2369.6(4) keV, with radiative and proton width of 0.49(3) eV and 34.9(2) keV respectively. A new reaction rate, based on present R-matrix fit and extrapolation, is suggested.

   nucl-exastro-ph.SRPRC(2023)·18 citations
3. 03*

   Higher Order Corrections to the Effective Field Theory of Low-energy Axions

   Bryan Cordero-Patino🇪🇨 · Álvaro Duenas-Vidal🇪🇨 · Jorge Segovia🇪🇸

   Dark matter (DM) can be composed of a collection of axions, or axion-like particles (ALPs), whose existence is due to the spontaneous breaking of the Peccei-Quinn $U(1)$ symmetry which is the most compelling solution of the strong $CP$-problem of Quantum Chromodynamics (QCD). Axions must be spin-$0$ particles with very small masses and extremely weak interactions with themselves as well as with the particles that constitute the Standard Model. In general, the physics of axions is detailed by a quantum field theory of a real scalar field, $\varphi$. Nevertheless, it is more convenient to implement a non-relativistic effective field theory with a complex scalar field, $\psi$, to characterize the mentioned axions in the low-energy regime. A possible application of this equivalent description is to study the collapse of cold dark matter into more complex structures. There have been a few derivations of effective Lagrangians for the complex field $\psi$; resulting to be all equivalent after a nonlocal-space transformation between $\varphi$ and $\psi$ was found, and some other corrections were introduced. Our contribution herein is to further provide higher order corrections, in particular, we compute the effective field theory Lagrangian up to order $({\psi }^{\ast }\psi {)}^5$, incorporating also the fast-oscillating field fluctuations into the dominant slowly-varying non-relativistic field.

   ↳ hep-phhep-exhep-thnucl-ex+1Symmetry(2023)·1 citation
4. 04*

   Characterizing and correcting electron and hole trapping in germanium cross-strip detectors

   Sean N. Pike · Steven E. Boggs · Jacqueline Beechert · Jarred Roberts · Albert Y. Shih · John A. Tomsick🇺🇸 · Andreas Zoglauer

   We present measurements of electron and hole trapping in three COSI germanium cross-strip detectors. By characterizing the relative charge collection efficiency (CCE) as a function of interaction depth, we show that intrinsic trapping of both electrons and holes have significant effects on the spectroscopic performance of the detectors. We find that both the electron and hole trapping vary from detector to detector, demonstrating the need for empirical trapping measurements and corrections. Using our measurements of charge trapping, we develop a continuous depth-dependent second-order energy correction procedure. We show that applying this empirical trapping correction produces significant improvements to spectral resolution and to the accuracy of the energy reconstruction.

   ↳ physics.ins-detastro-ph.IMnucl-exNucl.Instrum.Meth.A(2023)·3 citations
5. 05*

   Revisiting the extraction of charge radii of ${}^{40}$Ca and ${}^{208}$Pb with muonic atom spectroscopy

   Hui Hui Xie🇨🇳 · Tomoya Naito🇯🇵 · Jian Li🇨🇳 · Haozhao Liang🇯🇵

   The extractions of nuclear charge radii from muonic atom spectroscopy for ${}^{40}$Ca and ${}^{208}$Pb are revisited to analyze the model dependencies induced by employing a Fermi-type charge distribution. For that, the charge densities, together with the corresponding muonic transition energies, calculated by the covariant density functional theory are used as a benchmark. The root-mean-square deviation of transition energies is calculated to quantitatively investigate the sensitivities of transition energies to the details of the two-parameter Fermi distribution. It is found that the second and fourth moments of the charge distribution can be extracted accurately from the muonic atom spectroscopy without much model dependencies, whereas the obtained two-parameter Fermi distributions cannot reproduce the details of the benchmarking charge densities and, in particular, its surface-diffuseness parameter cannot be determined accurately with the present experimental uncertainties on the muonic transition energies.

   ↳ nucl-thnucl-exPLB(2023)·10 citations
6. 06*

   Non-Gaussian transverse momentum fluctuations from impact parameter fluctuations

   Rupam Samanta🇵🇱 · João Paulo Picchetti🇧🇷 · Matthew Luzum🇧🇷 · Jean-Yves Ollitrault🇫🇷

   The transverse momentum per particle, $[p_t]$, fluctuates event by event in ultrarelativistic nucleus-nucleus collisions, for a given multiplicity. These fluctuations are small and approximately Gaussian, but a non-zero skewness has been predicted on the basis of hydrodynamic calculations, and seen experimentally. We argue that the mechanism driving the skewness is that, if the system thermalizes, the mean transverse momentum increases with impact parameter for a fixed collision multiplicity. We postulate that fluctuations are Gaussian at fixed impact parameter, and that non-Gaussianities solely result from impact parameter fluctuations. Using recent data on the variance of $[p_t]$ fluctuations, we make quantitative predictions for their skewness and kurtosis as a function of the collision multiplicity. We predict in particular a spectacular increase of the skewness below the knee of the multiplicity distribution, followed by a fast decrease.

   ↳ nucl-thhep-exhep-phnucl-exPRC(2023)·24 citations
7. 07*

   QCD resummation of dijet azimuthal decorrelations in pp and pA collisions

   Mei-Sen Gao🇨🇳 · Zhong-Bo Kang🇺🇸 · Ding Yu Shao🇨🇳 · John Terry🇺🇸 · Cheng Zhang🇨🇳

   We study the azimuthal angular decorrelations of dijet production in both proton-proton (pp) and proton-nucleus (pA) collisions. By utilizing soft-collinear effective theory, we establish the factorization and resummation formalism at the next-to-leading logarithmic accuracy for the azimuthal angular decorrelations in the back-to-back limit in pp collisions. We propose an approach where the nuclear modifications to dijet production in pA collisions are accounted for in the nuclear modified transverse momentum dependent parton distribution functions (nTMDPDFs), which contain both collinear and transverse dynamics. This approach naturally generalizes the well-established formalism related to the nuclear modified collinear parton distribution functions (nPDFs). We demonstrate strong consistency between our methodology and the CMS measurements in both pp and pA collisions, and make predictions for dijet production in the forward rapidity region in pA collisions at LHC kinematics and for mid-rapidity kinematics at sPHENIX. Throughout this paper, we focus on the application of this formalism to a simultaneous fit to both collinear and transverse momentum dependent contributions to the transverse momentum dependent distributions.

   ↳ hep-phhep-exnucl-exnucl-thJHEP(2023)·18 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.