Journal Article

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2025-06-20
13:25
arXiv [PUBDB-2025-01926] Journal Article
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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]
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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2025-06-19
13:34
OpenAccess [PUBDB-2025-01918] Journal Article
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Site-Resolved Near-Surface Cation Diffusion in Magnetite
In situ nuclear forward scattering shows a thermally induced cation exchange between a 57 Fe3 ⁢O4 thin-film and a Fe3⁢ O4 (001) substrate predominantly in the octahedral sublattice for a temperature range between 470 and 710 K. The overall activation barrier in this temperature range is found to be 19±32  kJ/mol, which is significantly lower than expected from extrapolating a bulk diffusion model. [...]
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2025-06-18
11:12
OpenAccess [PUBDB-2025-01904] Journal Article
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Collective flavor conversions are interactions of neutrinos with quantized flavor waves
[arXiv:2502.06935]
Collective oscillations in dense neutrino gases (flavor waves) are notable for their instabilities that cause fast flavor conversion. We develop a quantum theory of interacting neutrinos and flavor wave quanta, which are analogous to plasmons, but also carry flavor. [...]
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2025-06-18
11:10
OpenAccess [PUBDB-2025-01903] Journal Article
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Theory of neutrino slow flavor evolution. Part II. Space-time evolution of linear instabilities
[arXiv:2501.16423]
Slow flavor evolution (defined as driven by neutrino masses and not necessarily ``slow'') is receiving fresh attention in the context of compact astrophysical environments. In Part~I of this series, we have studied the slow-mode dispersion relation following our recently developed analogy to plasma waves. [...]
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2025-06-18
11:05
OpenAccess [PUBDB-2025-01902] Journal Article
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Neutrino and pair creation in reconnection-powered coronae of accreting black holes
[arXiv:2410.12638]
A ubiquitous feature of accreting black hole systems is their hard X-ray emission which is thought to be produced through Comptonization of soft photons by electrons and positrons in the vicinity of the black hole, in a region with optical depth of order unity. The origin and composition of this Comptonizing region, known as the corona, is a matter open for debate. [...]
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2025-06-16
11:50
OpenAccess [PUBDB-2025-01872] Contribution to a conference proceedings/Journal Article
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The $^{57}$Fe Synchrotron Mössbauer Source at P01, PETRA III
15th International Conference on Synchrotron Radiation Instrumentation (SRI 2024), Meeting location, Journal of physics / Conference Series 3010(1), 012049 () [10.1088/1742-6596/3010/1/012049]  GO
The paper presents the development and performance of the $^{57}$Fe Synchrotron Mössbauer Source (SMS) at the beamline P01 at PETRA III. A detailed description of the experimental setup is provided, including the optical elements and the critical role of high-quality iron borate crystals used as the Mössbauer source. [...]
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2025-06-13
15:18
OpenAccess [PUBDB-2025-01871] Journal Article
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Pr$^{3+}$-doped RbCaF$_3$: a new X-ray-induced UVC persistent phosphor
The development of persistent ultraviolet-emitting phosphors is advancing rapidly because of their promisingapplications in alternative cancer treatments. In this work, we developed a novel Pr$^{3+}$-doped RbCaF3 phosphorexhibiting intense long-persistent luminescence in the 220–340 nm range, sustained for more than an hour afterjust 15 min of X-ray irradiation [...]
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2025-06-13
11:40
Embargoed OpenAccess [PUBDB-2025-01868] Journal Article
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Luminescence of CsI:Na crystal scintillator under synchrotron radiation excitation
This work investigates the luminescence properties and energetic structure of emission centers created by NaCsisoelectronic impurities in a well-known CsI:Na scintillation crystal. Using synchrotron radiation excitation at 8K, high-resolution spectroscopic techniques were employed to probe the electronic transitions and luminescentdynamics within the crystal. [...]
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2025-06-12
12:25
OpenAccess [PUBDB-2025-01856] Journal Article
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Measurement of the branching fraction, polarization, and time-dependent $CP$ asymmetry in $B^0 \to \rho^+\rho^-$ decays and constraint on the CKM angle $\phi_2$
[Belle II preprint 2024-024; KEK preprint 2024-23; arXiv:2412.19624]
We present a measurement of the branching fraction and fraction of longitudinal polarization of $B^0 \to \rho^+ \rho^-$ decays, which have two $\pi^0$'s in the final state. We also measure time-dependent $CP$ violation parameters for decays into longitudinally polarized $\rho^+ \rho^-$ pairs. [...]
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2025-06-12
12:22
OpenAccess [PUBDB-2025-01855] Journal Article
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Measurement of the branching fraction and $\it CP$-violating asymmetry of the decay $B^{0} \rightarrow \pi^{0} \pi^{0}$ using $387$ million bottom-antibottom meson pairs in Belle II data
[Belle II Preprint 2024-032; KEK Preprint 2024-34; arXiv:2412.14260]
We measure the branching fraction and $\it CP$-violating flavor-dependent rate asymmetry of $B^{0} \to \pi^{0} \pi^{0}$ decays reconstructed using the Belle II detector in an electron-positron collision sample containing $387 \times 10^{6}$$B\overline{B}$ pairs. Using an optimized event selection, we find $126\pm 20$ signal decays in a fit to background-discriminating and flavor-sensitive distributions. [...]
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