2022-01-14
06:23 |
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2022-01-14
06:23 |
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2022-01-14
04:10 |
Search for Darkonium in $e^+e^-$ Collisions
/ BABAR Collaboration
Collider searches for dark sectors, new particles interacting only feebly with ordinary matter, have largely focused on identifying signatures of new mediators, leaving much of dark sector structures unexplored. In particular, the existence of dark matter bound states (darkonia) remains to be investigated. [...]
arXiv:2106.08529; BABAR-PUB-21/002; SLAC-PUB-17608.-
2022-01-11 - 10 p.
- Published in : Phys. Rev. Lett. 128 (2022) 021802
Fulltext: PDF;
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2022-01-13
06:16 |
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2022-01-13
06:16 |
General mitigation techniques for coherent beam instabilities in particle accelerators
/ Métral, Elias (CERN)
An important number of coherent beam instability mechanisms can be observed in a particle accelerator, depending if the latter is linear or circular, operated at low, medium or high energy, with a small or a huge amount of turns (for circular machines), close to transition energy or not (below or above), with only one bunch or many bunches, with counter-rotating beams (such as in colliders) or not, if the beam is positively or negatively charged, if one is interested in the longitudinal plane or in the transverse plane, in the presence of linear coupling between the transverse planes or not, in the presence of nonlinearities or not, in the presence of noise or not, etc. Building a realistic impedance model of a machine is a necessary step to be able to evaluate the machine performance limitations, identify the main contributors in case an impedance reduction is required, and study the interaction with other mechanisms such as optics (linear and nonlinear), RF gymnastics, transverse damper, noise, space charge, electron cloud, and beam–beam (in a collider). [...]
2021 - 23 p.
- Published in : Eur. Phys. J. Plus 137 (2022) 47
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2022-01-13
06:16 |
The challenge of monochromatization : Direct s-Channel Higgs Production: $e^+e^- \to H
/ Faus-Golfe, Angeles (IJCLab, Orsay) ; Valdivia Garcia, Marco Alan (Guanajuato U. ; CERN) ; Zimmermann, Frank (CERN)
The FCC-ee could measure the electron Yukawa coupling in a dedicated run at $\sim $125 GeV collision energy, provided that the center-of-mass (CM) energy spread can be reduced by means of monochromatization, e.g., through introducing nonzero horizontal dispersion of opposite sign at the interaction point (IP), for the two colliding beams. If the IP dispersion is nonzero, beamstrahlung blows up the horizontal emittance, and self-consistent IP parameters need to be determined. [...]
2021 - 9 p.
- Published in : Eur. Phys. J. Plus 137 (2022) 31
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2022-01-13
06:16 |
Evaluating POWER Architecture for Distributed Training of Generative Adversarial Networks
/ Hesam, Ahmad (CERN ; Delft Tech. U.) ; Vallecorsa, Sofia (CERN) ; Khattak, Gulrukh (CERN) ; Carminati, Federico (CERN)
The increased availability of High-Performance Computing resources can enable data scientists to deploy and evaluate data-driven approaches, notably in the field of deep learning, at a rapid pace. As deep neural networks become more complex and are ingesting increasingly larger datasets, it becomes unpractical to perform the training phase on single machine instances due to memory constraints, and extremely long training time. [...]
2019 - 9 p.
- Published in : 10.1007/978-3-030-34356-9_32
In : High Performance Computing: ISC High Performance 2019 International Workshops, Frankfurt, Germany, June 16-20, 2019, Revised Selected Papers, Frankfurt, Germany, 16 - 20 Jun 2019, pp.432-440
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2022-01-13
06:16 |
Evidence against the wobbling nature of low-spin bands in $^{135}$Pr
/ Lv, B.F. (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) ; Petrache, C.M. (IJCLab, Orsay) ; Lawrie, E.A. (iThemba LABS ; Western Cape U.) ; Guo, S. (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) ; Astier, A. (IJCLab, Orsay) ; Dupont, E. (IJCLab, Orsay) ; Zheng, K.K. (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS ; IJCLab, Orsay) ; Ong, H.J. (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) ; Wang, J.G. (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) ; Zhou, X.H. (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) et al.
The electromagnetic character of the $\Delta I=1$ transitions connecting the one- to zero-phonon and the two- to one-phonon wobbling bands should be dominated by an $E2$ component, due to the collective motion of the entire nuclear charge. In the present work it is shown, based on combined angular correlation and linear polarization measurements, that the mixing ratios of all analyzed connecting transitions between low-lying bands in $^{135}$Pr interpreted as zero-, one-, and two-phonon wobbling bands, have absolute values smaller than one. [...]
arXiv:2106.04879.-
2022-01-10 - 6 p.
- Published in : Phys. Lett. B 824 (2022) 136840
Fulltext: 1-s2.0-S0370269321007802-main - PDF; 2106.04879 - PDF;
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2022-01-13
06:16 |
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2022-01-13
06:16 |
Producing gold at ISOLDE-CERN
/ Barzakh, A E (St. Petersburg, INP) ; Andreyev, A N (York U., England ; JAERI, Tokai) ; Atanasov, D (Heidelberg, Max Planck Inst.) ; Cubiss, J G (York U., England) ; Harding, R D (York U., England ; CERN) ; Al Monthery, M (York U., England) ; Althubiti, N A (Manchester U. ; Al Jouf U.) ; Andel, B (Comenius U. ; Leuven U.) ; Antalic, S (Comenius U.) ; Ballof, J (CERN ; Mainz U., Inst. Kernchem.) et al.
The yield of 18 ion beams of radioactive gold nuclei produced in the thick uranium target at ISOLDE (CERN) by 1.4-GeV protons was measured. The production-efficiency dependence on the half-life (efficiency curve) was derived using the in-target production calculations by the FLUKA-CERN code. [...]
2022 - 7 p.
- Published in : Nucl. Instrum. Methods Phys. Res., B 513 (2022) 26-32
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