Thu·Apr 20, 2023Thursday·April 20, 2023

1. 01*

   Centrality Dependent Lévy Analysis of two-pion BEC Functions at PHENIX

   Tamas Novak🇭🇺

   We present most recent PHENIX preliminary data on centrality dependence of two-pion Bose-Einstein correlation functions measured in \sqrt{sNN}=200 GeV Au+Au collisions at the Relativistic Heavy Ion Collider (RHIC). The data are well described by assuming the source to be a Lévy-stable distribution. The Lévy parameters, R, alpha, lambda are measured in 18 bins of transverse mass (mT) for 4 centrality intervals. The Lévy scale parameter R(mT) decreases with mT and exhibits a clear centrality ordering which supports its geometrical interpretation. The Lévy exponent {\alpha}(mT) is independent of mT in every centrality bin but shows some centrality dependence. At all centralities {\alpha} is significantly different from that of a Gaussian ({\alpha} = 2) or Cauchy ({\alpha} = 1) source distribution. The Lévy strength parameter {\lambda} was also investigated. We observed that {\lambda}(mT) decreases at low mT and saturates around mT = 0.6 GeV/c2. In the already published 0-30% centrality class, Monte Carlo simulations are found to be inconsistent with the measurements, unless a significant reduction of the in-medium mass of the etaprime meson is included.

   nucl-exhep-exEPJ Web Conf.(2023)·1 citation
2. 02*

   Coulomb Corrections for Coherent Neutrino Nucleus Scattering

   Ryan Plestid🇺🇸

   In this work we consider sub-leading $O(Z^2{\alpha }^3)$ corrections to coherent elastic neutrino nucleus scattering (CEvNS). These corrections are not negligible by power counting since nuclei with large coherent cross sections have sizeable nuclear charges e.g.\ $Z\alpha \sim 0.4$. We find that the corrections are much smaller than naive power counting in $Z\alpha$ would suggest and that Coulomb corrections do not substantially alter predictions for CEvNS in the Standard Model. We comment on similarities to older literature on mesonic and muonic atoms.

   ↳ hep-phhep-exnucl-exnucl-th+1JHEP(2025)·1 citation
3. 03*

   Modeling Charge Cloud Dynamics in Cross Strip Semiconductor Detectors

   Steven E. Boggs

   When a $\gamma$-ray interacts in a semiconductor detector, the resulting electron-hole charge clouds drift towards their respective electrodes for signal collection. These charge clouds will expand over time due to both thermal diffusion and mutual electrostatic repulsion. Solutions to the resulting charge profiles are well understood for the limiting cases accounting for only diffusion and only repulsion, but the general solution including both effects can only be solved numerically. Previous attempts to model these effects have taken into account the broadening of the charge profile due to both effects, but have simplified the shape of the profile by assuming Gaussian distributions. However, the detailed charge profile can have important impacts on charge sharing in multi-electrode strip detectors. In this work, we derive an analytical approximation to the general solution, including both diffusion and repulsion, that closely replicates both the width and the detailed shape of the charge profiles. This analytical solution simplifies the modeling of charge clouds in semiconductor strip detectors.

   ↳ astro-ph.IMnucl-exphysics.ins-detNucl.Instrum.Meth.A(2023)·3 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.