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CERN Accelerating science

CERN Published Articles

Najnovije dodano:
2021-04-17
06:25
Characterization of a polyphenyl ether oil irradiated at high doses in a TRIGA Mark II nuclear reactor / Ferrari, Matteo (Brescia U. ; CERN) ; Zenoni, Aldo (U. Brescia ; INFN, Pavia) ; Lee, Yongjoong (ESS, Lund) ; Hayashi, Yoshikazu (Unlisted, JP)
Samples of a commercially available polyphenyl ether (PPE) oil are irradiated in the mixed neutron and gamma radiation field of the Pavia TRIGA Mark II reactor, at irradiation doses ranging from 0.78 MGy to 7.8 MGy. The oil is a nuclear grade product, whose radiation resistance reported in the product specification is based on cobalt-60 gamma irradiation data. [...]
2021 - 9 p. - Published in : Nucl. Instrum. Methods Phys. Res., B 497 (2021) 1-9 Fulltext from publisher: PDF;

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2021-04-17
06:25
PENGEOM — A general-purpose geometry package for Monte Carlo simulation of radiation transport in complex material structures (New Version Announcement) / Almansa, Julio (Univ. Hosp. San Cecilio) ; Salvat-Pujol, Francesc (CERN) ; Díaz-Londoño, Gloria (Natl. U. of Columbia, Medellin) ; Carnicer, Artur (Barcelona U.) ; Lallena, Antonio M (Granada U.) ; Salvat, Francesc (Barcelona U.)
A new version of the code system pengeom , which provides a complete set of tools to handle different geometries in Monte Carlo simulations of radiation transport, is presented. The distribution package consists of a set of Fortran subroutines and a Java graphical user interface that allows building and debugging the geometry-definition file, and producing images of the geometry in two- and three-dimensions. [...]
2021 - Published in : Comput. Phys. Commun. 264 (2021) 107962

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2021-04-17
06:25
Quarkonium Production Measurements with the ALICE Detector at the LHC / Fionda, F (Bergen U.) /ALICE Collaboration
In (ultra-)relativistic heavy-ion collisions, the strongly interactingmatter is predicted to undergo a phase transition into a plasma of deconfinedquarks and gluons (QGP) and quarkonia probe different aspects of this medium.However, the medium modification of quarkonium production includes also the contribution of cold nuclear matter effects (CNM), such as shadowing or nuclear break-up in addition to QGP effects. Proton--nucleus collisions, where no QGP is expected, are used to measure cold nuclear matter effects on quarkonium production. [...]
2019 - 7 p. - Published in : Ukr. J. Phys. 64 (2019) 566-572 fulltext: PDF;
In : New Trends in High-Energy Physics, Odessa, Ukraine, 12 - 18 May 2019, pp.566-572

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2021-04-17
04:01
Mechanism of Indirect Photon-induced Desorption at the Water Ice Surface / Dupuy, R. (Paris U., IV ; Paris Observ. ; U. PSL ; LERMA, Ivry) ; Bertin, M. (Paris U., IV ; Paris Observ. ; U. PSL ; LERMA, Ivry) ; Féraud, G. (Paris U., IV ; Paris Observ. ; U. PSL ; LERMA, Ivry) ; Michaut, X. (Paris U., IV ; Paris Observ. ; U. PSL ; LERMA, Ivry) ; Marie-Jeanne, P. (Paris U., IV ; Paris Observ. ; U. PSL ; LERMA, Ivry) ; Jeseck, P. (Paris U., IV ; Paris Observ. ; U. PSL ; LERMA, Ivry) ; Philippe, L. (Paris U., IV ; Paris Observ. ; U. PSL ; LERMA, Ivry) ; Baglin, V. (CERN) ; Cimino, R. (LNF, Dafne Light) ; Romanzin, C. (U. Paris-Sud 11, Dept. Phys., Orsay ; U. Paris-Saclay) et al.
Electronic excitations near the surface of water ice lead to the desorption of adsorbed molecules, through a so far debated mechanism. A systematic study of photon-induced indirect desorption, revealed by the spectral dependence of the desorption (7 to 13 eV), is conducted for Ar, Kr, N$_{2}$, and CO adsorbed on H$_{2}$O or D$_{2}$O amorphous ices. [...]
arXiv:2104.05567.- 2021-04-12 - Published in : Phys. Rev. Lett. 126 (2021) 156001 Fulltext: PDF;

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2021-04-17
04:01
Search for $Z'$ pair production from scalar boson decay in minimal $U(1)_{L_\mu - L_\tau }$ model at the LHC / Nomura, Takaaki (Sichuan U.) ; Shimomura, Takashi (Miyazaki U.)
We consider a model with gauged $L_\mu - L_\tau$ symmetry in which the symmetry is spontaneously broken by a scalar field. The decay of the scalar boson into two new gauge bosons is studied as a direct consequence of the spontaneous symmetry breaking. [...]
arXiv:2012.13049; CTP-SCU/2020041; UME-PP-016.- 2021-04-09 - 13 p. - Published in : Eur. Phys. J. C 81 (2021) 297 Article from SCOAP3: PDF; Fulltext: PDF;

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2021-04-17
04:01
Light Higgs searches in $ t\overline{t}\phi $ production at the LHC / Azevedo, Duarte (Lisbon U.) ; Capucha, Rodrigo (Lisbon U.) ; Gouveia, Emanuel (LIP, Minho) ; Onofre, António (Minho U.) ; Santos, Rui (Lisbon U. ; Lisbon, ISEL)
In this paper we propose a new reconstruction method to explore the low mass region in the associated production of top-quark pairs ($t\bar{t}$) with a generic scalar boson ($\phi$) at the LHC. The new method of mass reconstruction shows an improved resolution of at least a factor of two in the low mass region when compared to previous methods, without the loss of sensitivity of previous analyses. [...]
arXiv:2012.10730.- 2021-04-09 - 23 p. - Published in : JHEP 2104 (2021) 077 Article from SCOAP3: PDF; Fulltext: PDF;

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2021-04-17
04:01
Particle collisions near static spherically symmetric black holes / Hackmann, Eva (Bremen U., ZARM) ; Nandan, Hemwati (Gurukula Kangri U., Haridwar ; UCT-CERN Res. Ctr.) ; Sheoran, Pankaj (IFM-UMSNH, Michoacan)
It has been shown by Ba\~{n}ados, Silk and West (BSW) that the center of mass energy (E_cm) of test particles starting from rest at infinity and colliding near the horizon of a Schwarzschild black hole is always finite. In this communication, we extent the BSW scenario and study two particles with different energies colliding near the horizon of a static spherically symmetric black hole. [...]
arXiv:2006.05045.- 2020-11-10 - Published in : Phys. Lett. B 810 (2020) 135850 Article from SCOAP3: PDF; Fulltext: PDF;

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2021-04-16
13:18
Gating of charge sensitive preamplifiers for the use at pulsed radiation sources. / Urlass, Sebastian (HZDR) ; Junghans, Arnd (HZDR) ; Mingrone, Federica (CERN) ; Peronnard, Paul (CERN) ; Stach, Daniel (HZDR) ; Tassan-Got, Laurent (CNRS/IN2P3 IJCLab) ; Weinberger, David (HZDR) /n_TOF Collaboration
The development of a switch circuit to gate charge sensitive preamplifiers for use at pulsed radiation sources will be presented. This development was used for the $^{16}$O(n,$\alpha$)$^{13}$C reaction measurement with a Double Frisch Grid Ionization Chamber (DFGIC) at the neutron time-of-flight facility CERN n_TOF in Geneva, Switzerland. [...]
Geneva : CERN, 2021 - 9 p. - Published in : Nucl. Instrum. Methods Phys. Res. A

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2021-04-16
06:03
Higgs to WW measurements with CMS / Di Croce, Davide (Antwerp U.)
The measurement of the Higgs boson decay to a W boson pair with an integrated luminosity of 35.9 fb$\rm{^{-1}}$ collected by the CMS experiment at the LHC at 13 TeV center of mass energy is presented. The results led to the observation of the Higgs boson decay to WW with more than 5 standard deviations for the first time at CMS, providing a significant contribution to the current fit of the Higgs boson couplings to fermions and vector bosons..
SISSA, 2020 - 5 p. - Published in : PoS EPS-HEP2019 (2020) 364
In : European Physical Society Conference on High Energy Physics (EPS-HEP) 2019, Ghent, Belgium, 10 - 17 Jul 2019, pp.364

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2021-04-16
06:03
Search for 2HDM neutral Higgs bosons through the process H $\rightarrow$ ZA $\rightarrow \ell^+ \ell^-b\overline{b}$ with the CMS detector / Saggio, Alessia (Louvain U., CP3) /CMS Collaboration
The inability of the standard model (SM) to explain some observed phenomena motivates theoretical models featuring an extension of the SM scalar sector that predict additional Higgs bosons. The Two-Higgs-doublet model (2HDM) is one of these. [...]
SISSA, 2019 - 6 p. - Published in : PoS EPS-HEP2019 (2020) 361
In : European Physical Society Conference on High Energy Physics (EPS-HEP) 2019, Ghent, Belgium, 10 - 17 Jul 2019, pp.361

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