2022-06-28 11:03 |
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2022-06-28 11:01 |
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2022-06-24 11:52 |
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2022-06-23 16:22 |
[PUBDB-2022-03175]
Preprint
ZEUS Collaboration
Measurement of the cross-section ratio $\sigma_{\psi(2S )}/\sigma_{J/\psi(1S )}$ in exclusive photoproduction at HERA
[DESY-22-107; arXiv:2206.13343]
The exclusive photoproduction reactions $\gamma p \to J/\psi(1S) p$ and $\gamma p \to \psi(2S) p$ have been measured at an $ep$ centre-of-mass energy of 318 GeV with the ZEUS detector at HERA using an integrated luminosity of 373 pb$^{-1}$. The measurement was made in the kinematic range $30 < W < 180$ GeV, $Q^2 < 1$ GeV$^2$ and $|t| < 1$ GeV$^2$, where $W$ is the photon--proton centre-of-mass energy, $Q^2$ is the photon virtuality and $t$ is the squared four-momentum transfer at the proton vertex. [...]
Fulltext: HTML-Approval_of_scientific_publication - HTML; PDF-Approval_of_scientific_publication - PDF; PsiPhotoproduction_Submit - PDF PDF (PDFA); Restricted: PDF PDF (PDFA); External link: Fulltext
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2022-06-17 13:08 |
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2022-06-17 11:11 |
[PUBDB-2022-02957]
Preprint
Schwickert, D. ; Ruberti, M. ; KolorenĨ, P. ; et al
Electronic Quantum Coherence in Glycine Molecules Probed with Ultrashort X-ray Pulses in Real Time
[arXiv:2012.04852]
Quantum coherence between electronic states of a photoionized molecule and the resulting process of ultrafast electron-hole migration have been put forward as a possible quantum mechanism of charge-directed reactivity governing the photoionization-induced molecular decomposition. Attosecond experiments based on the indirect (fragment ion-based) characterization of the proposed electronic phenomena suggest that the photoionization-induced electronic coherence can survive for tens of femtoseconds, while some theoretical studies predict much faster decay of the coherence due to the quantum uncertainty in the nuclear positions and the nuclear-motion effects. [...]
OpenAccess: PDF PDF (PDFA);
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2022-06-17 10:50 |
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2022-06-15 21:51 |
[PUBDB-2022-02943]
Preprint
Depta, P. F. ; Bringmann, T. ; Hufnagel, M. ; et al
A new life for sterile neutrino dark matter after the pandemic
[CERN-TH-2022-099; DESY-22-102; ULB-TH/22-09; arXiv:2206.10630]
We propose a novel mechanism to generate sterile neutrinos $\nu_s$ in the early Universe, by converting ordinary neutrinos $\nu_\alpha$ in scattering processes $\nu_s\nu_\alpha\to\nu_s\nu_s$. After initial production by oscillations, this leads to an exponential growth in the $\nu_s$ abundance. [...]
Fulltext: HTML-Approval_of_scientific_publication - HTML; PDF-Approval_of_scientific_publication - PDF; OpenAccess: 2206.10630 - PDF PDF (PDFA); 2206.10630v1 - PDF PDF (PDFA);
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2022-06-14 23:45 |
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2022-06-14 09:53 |
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