Preprints

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2024-07-02
08:27
OpenAccess [PUBDB-2024-04925] Preprint
; ; ; et al
Accuracy and Performance Evaluation of Low Density Internal and External Flow Predictions using CFD and DSMC
[arXiv:2401.13344]
The Direct Simulation Monte Carlo (DSMC) method was widely used to simulate low density gas flows with large Knudsen numbers. However, DSMC encounters limitations in the regime of lower Knudsen numbers (Kn<0.1) [...]
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2024-06-28
13:13
arXiv [PUBDB-2024-04907] Preprint
; ; ; et al
StoRM: A Diffusion-Based Stochastic Regeneration Model for Speech Enhancement and Dereverberation
[arXiv:2212.11851]
 GO
Diffusion models have shown a great ability at bridging the performance gap between predictive and generative approaches for speech enhancement. We have shown that they may even outperform their predictive counterparts for non-additive corruption types or when they are evaluated on mismatched conditions. [...]
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2024-06-24
10:01
arXiv [PUBDB-2024-04838] Preprint
; ; ; et al
The FASER detector
[CERN-FASER-2022-001; arXiv:2207.11427]
 GO
FASER, the ForwArd Search ExpeRiment, is an experimentdedicated to searching for light, extremely weakly-interactingparticles at CERN's Large Hadron Collider (LHC). Such particlesmay be produced in the very forward direction of the LHC'shigh-energy collisions and then decay to visible particles insidethe FASER detector, which is placed 480 m downstream of the ATLASinteraction point, aligned with the beam collisions axis. [...]
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2024-06-21
11:58
arXiv [PUBDB-2024-04819] Preprint
; ; ; et al
Technical design report for the CODEX-beta demonstrator
[arXiv:2406.12880]
 GO
The CODEX-$\beta$ apparatus is a demonstrator for the proposed future CODEX-b experiment, a long-lived-particle detector foreseen for operation at IP8 during HL-LHC data-taking. The demonstrator project, intended to collect data in 2025, is described, with a particular focus on the design, construction, and installation of the new apparatus..
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2024-06-20
11:28
arXiv [PUBDB-2024-04809] Preprint
; ; ; et al
Measurements of the branching fractions of $\Xi_{c}^{0}\to\Xi^{0}\pi^{0}$, $\Xi_{c}^{0}\to\Xi^{0}\eta$, and $\Xi_{c}^{0}\to\Xi^{0}\eta^{\prime}$ and asymmetry parameter of $\Xi_{c}^{0}\to\Xi^{0}\pi^{0}$
[Belle II Preprint 2024-015; KEK Preprint 2024-9; arXiv:2406.04642]
 GO
We present a study of $\Xi_{c}^{0}\to\Xi^{0}\pi^{0}$, $\Xi_{c}^{0}\to\Xi^{0}\eta$, and $\Xi_{c}^{0}\to\Xi^{0}\eta^{\prime}$ decays using the Belle and Belle~II data samples, which have integrated luminosities of 980~$\mathrm{fb}^{-1}$ and 426~$\mathrm{fb}^{-1}$, respectively. We measure the following relative branching fractions $${\cal B}(\Xi_{c}^{0}\to\Xi^{0}\pi^{0})/{\cal B}(\Xi_{c}^{0}\to\Xi^{-}\pi^{+}) = 0.48 \pm 0.02 ({\rm stat}) \pm 0.03 ({\rm syst}) ,$$ $${\cal B}(\Xi_{c}^{0}\to\Xi^{0}\eta)/{\cal B}(\Xi_{c}^{0}\to\Xi^{-}\pi^{+}) = 0.11 \pm 0.01 ({\rm stat}) \pm 0.01 ({\rm syst}) ,$$ $${\cal B}(\Xi_{c}^{0}\to\Xi^{0}\eta^{\prime})/{\cal B}(\Xi_{c}^{0}\to\Xi^{-}\pi^{+}) = 0.08 \pm 0.02 ({\rm stat}) \pm 0.01 ({\rm syst}) $$ for the first time, where the uncertainties are statistical ($\rm stat$) and systematic ($\rm syst$). [...]
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2024-06-20
11:24
OpenAccess [PUBDB-2024-04808] Preprint
; ; ; et al
Measurement of the energy dependence of the $e^+e^- \to B\bar{B}$, $B\bar{B}{}^*$, and $B^*\bar{B}{}^*$ cross sections at Belle~II
[Belle II Preprint 2024-016; KEK Preprint 2024-12; arXiv:2405.18928]
We report measurements of the $e^+e^- \to B\bar{B}$, $B\bar{B}{}^*$, and $B^*\bar{B}{}^*$ cross sections at four energies, 10653, 10701, 10746 and 10805 MeV, using data collected by the Belle~II experiment. We reconstruct one $B$ meson in a large number of hadronic final states and use its momentum to identify the production process. [...]
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2024-06-20
11:19
OpenAccess [PUBDB-2024-04806] Preprint
; ; ; et al
Search for the decay $B^{0}\to\gamma\gamma$ using Belle and Belle II data
[Belle II Preprint: 2024-017; KEK Preprint: 2024-13; arXiv:2405.19734]
We report the result of a search for the rare decay $B^{0} \to \gamma \gamma$ using a combined dataset of $753\times10^{6}$$B\bar{B}$ pairs collected by the Belle experiment and $387\times10^{6}$$B\bar{B}$ pairs collected by the Belle II experiment from decays of the $\rm \Upsilon(4S)$ resonance produced in $e^{+}e^{-}$ collisions. A simultaneous fit to the Belle and Belle II data sets yields $11.0^{+6.5}_{-5.5}$ signal events, corresponding to a 2.5$\sigma$ significance. [...]
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2024-06-20
11:15
OpenAccess [PUBDB-2024-04805] Preprint
; ; ; et al
Test of light-lepton universality in $\tau$ decays with the Belle II experiment
[Belle II Preprint 2024-002; KEK Preprint 2023-49; arXiv:2405.14625]
We present a measurement of the ratio $R_\mu = \mathcal{B}(\tau^-\to \mu^-\bar\nu_\mu\nu_\tau) / \mathcal{B}(\tau^-\to e^-\bar\nu_e\nu_\tau)$ of branching fractions $\mathcal{B}$ of the $\tau$ lepton decaying to muons or electrons using data collected with the Belle II detector at the SuperKEKB $e^+e^-$ collider. The sample has an integrated luminosity of 362 fb$^{-1}$ at a centre-of-mass energy of 10.58 GeV. [...]
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2024-06-12
14:07
OpenAccess [PUBDB-2024-04693] Preprint
; ; ; et al
Resolving non-equilibrium shape variations amongst millions of gold nanoparticles
[arXiv:2401.04896]
Nanoparticles, exhibiting functionally relevant structural heterogeneity, are at the forefront of cutting-edge research. Now, high-throughput single-particle imaging (SPI) with x-ray free-electron lasers (XFELs) creates unprecedented opportunities for recovering the shape distributions of millions of particles that exhibit functionally relevant structural heterogeneity. [...]
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2024-06-07
14:10
arXiv [PUBDB-2024-02834] Preprint
; ; ; et al
Stairway to discovery: a report on the CMS programme of cross section measurements from millibarns to femtobarns
[CERN-EP-2024-117; CMS-SMP-23-004; arXiv:2405.18661]
 GO
The Large Hadron Collider at CERN, delivering proton-proton collisions at much higher energies and far higher luminosities than previous machines, has enabled a comprehensive programme of measurements of the standard model (SM) processes by the CMS experiment. These unprecedented capabilities facilitate precise measurements of the properties of a wide array of processes, the most fundamental being cross sections. [...]
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