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CERN Document Server 63 records found  1 - 10nextend  jump to record: Search took 0.57 seconds. 
1.
CPT and Lorentz symmetry tests with hydrogen using a novel in-beam hyperfine spectroscopy method applicable to antihydrogen experiments / Nowak, Lilian (CERN ; Stefan Meyer Inst. Subatomare Phys. ; Vienna U.) ; Malbrunot, Chloe (CERN) ; Simon, Martin C. (Stefan Meyer Inst. Subatomare Phys.) ; Amsler, Claude (Stefan Meyer Inst. Subatomare Phys.) ; Cuendis, Sergio Arguedas (Stefan Meyer Inst. Subatomare Phys.) ; Lahs, Sebastian (Stefan Meyer Inst. Subatomare Phys.) ; Lanz, Andreas (Stefan Meyer Inst. Subatomare Phys. ; Vienna U.) ; Nanda, Amit (Stefan Meyer Inst. Subatomare Phys. ; Vienna U.) ; Wiesinger, Markus (Stefan Meyer Inst. Subatomare Phys.) ; Wolz, Tim (CERN) et al.
We present a Rabi-type measurement of two ground-state hydrogen hyperfine transitions performed in two opposite external magnetic field directions. This puts first constraints at the level of 2.3 10^-21 GeV on a set of coefficients of the Standard Model Extension, which were not measured by previous experiments. [...]
arXiv:2403.17763.- 2024-09-10 - 7 p. - Published in : Phys. Lett. B 858 (2024) 139012 Fulltext: 2403.17763 - PDF; Publication - PDF;
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2.
Antiproton annihilation at rest in thin solid targets and comparison with Monte Carlo simulations / Amsler, Claude (Stefan Meyer Inst. Subatomare Phys.) ; Breuker, Horst (Wako, RIKEN) ; Bumbar, Marcus (CERN ; Vienna U.) ; Cerwenka, Matti (Stefan Meyer Inst. Subatomare Phys. ; Vienna U.) ; Costantini, Giovanni (Brescia U. ; INFN, Brescia ; INFN, Pavia) ; Ferragut, Rafael (Milan Polytechnic ; INFN, Milan ; Milan U.) ; Fleck, Markus (Stefan Meyer Inst. Subatomare Phys.) ; Giammarchi, Marco (INFN, Milan ; Milan U.) ; Gligorova, Angela (Stefan Meyer Inst. Subatomare Phys.) ; Gosta, Giulia (Brescia U. ; INFN, Brescia ; INFN, Pavia) et al. /Asacusa AD-3
The mechanism of antiproton-nucleus annihilation at rest is not fully understood, despite substantial previous experimental and theoretical work. In this study we used slow extracted, sub-keV antiprotons from the ASACUSA apparatus at CERN to measure the charged particle multiplicities and their energy deposits from antiproton annihilations at rest on three different nuclei: carbon, molybdenum and gold. [...]
arXiv:2407.06721.- Geneva : CERN, 2024-11-17 - 18 p. - Published in : Eur. Phys. J. A 60 (2024) 225 Draft (restricted): PDF; Fulltext: CERN-EP-2024-182 - PDF; document - PDF; 2407.06721 - PDF;
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3.
CPT and Lorentz symmetry tests with hydrogen using a novel in-beam hyperfine spectroscopy method applicable to antihydrogen experiments / Nowak, Lilian ; Malbrunot, Chloé ; Simon, Martin C. ; Amsler, Claude ; Arguedas Cuendis, Sergio ; Lahs, Sebastian ; Lanz, Andreas ; Nanda, Amit ; Wiesinger, Markus ; Wolz, Tim et al. /Asacusa AD-3
We present a Rabi-type measurement of two ground-state hydrogen hyperfine transitions performed in two opposite external magnetic field directions. This puts first constraints at the level of 2.3 × 10^{−21} GeV on a set of coefficients of the Standard Model Extension, which were not measured by previous experiments. [...]
CERN-EP-2024-089.- Geneva : CERN, 2024 - 9. Draft (restricted): PDF; Fulltext: PDF;
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4.
A Rydberg hydrogen beam for studies of stimulated deexcitation / Wolz, Tim (CERN) ; Allemand, Maxime (Ecole Normale Supérieure, Paris) ; Comparat, Daniel (LAC, Orsay) ; Cras, Jules (LAC, Orsay) ; Killian, Carina (Stefan Meyer Inst. Subatomare Phys.) ; Malbrunot, Chloé (CERN) ; Gustafsson, Fredrik Parnefjord (Stefan Meyer Inst. Subatomare Phys.) ; Simon, Martin (Stefan Meyer Inst. Subatomare Phys.) ; Siour, Christophe (LAC, Orsay) ; Widmann, Eberhard (Stefan Meyer Inst. Subatomare Phys.) /AEgIS Collaboration ; ASACUSA-CUSP Collaboration
We present a Rydberg hydrogen beamline developed to commission techniques of stimulated deexcitation for application in antihydrogen experiments at CERN's Antiproton Decelerator. The stimulation of spontaneous decay is a key technology to enhance the number of ground-state anti-atoms available in a beam toward precision spectroscopy and gravity measurements..
arXiv:2204.09537.- 2022 - 5 p. - Published in : EPJ Web Conf. 262 (2022) 01002 Fulltext: document - PDF; 2204.09537 - PDF;
In : 7th International Conference on Exotic Atoms and Related Topics, Online, 13 - 17 Sep 2021, pp.01002
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5.
Monte-Carlo simulation of positronium laser excitation and anti-hydrogen formation via charge exchange / AEgIS Collaboration
The AEgIS experiment aims at producing antihydrogen (and eventually measuring the effects of the Earth gravitational field on it) with a method based on the charge exchange reaction between antiproton and Rydberg positronium. To be precise, antiprotons are delivered by the CERN Antiproton Decelerator (AD) and are trapped in a multi-ring Penning trap, while positronium is produced by a nanoporous silica target and is excited to Rydberg states by means of a two steps laser excitation. [...]
2019 - 11 p. - Published in : Hyperfine Interact. 240 (2019) 18
In : 13th International Conference on Low Energy Antiproton Physics, Paris, France, 12 - 16 Mar 2018, pp.18
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6.
Imaging a positronium cloud in a 1 Tesla / Camper, Antoine (CERN) ; Aghion, Stefano (Milan Polytechnic ; INFN, Milan) ; Amsler, Claude (Stefan Meyer Inst. Subatomare Phys.) ; Antonello, Massimiliano (INFN, Milan ; Insubria U., Como) ; Belov, Alexander (Moscow, INR) ; Bonomi, Germano (INFM, Brescia ; INFN, Pavia) ; Brusa, Roberto (Trento U. ; TIFPA-INFN, Trento) ; Caccia, Massimo (INFN, Milan ; Insubria U., Como) ; Caravita, Ruggero (CERN) ; Castelli, Fabrizio (INFN, Milan ; Milan U.) et al.
We report on recent developments in positronium work in the frame of antihydrogen production through charge exchange in the AEgIS collaboration [1]. In particular, we present a new technique based on spatially imaging a cloud of positronium by collecting the positrons emitted by photoionization. [...]
2019 - 7 p. - Published in : EPJ Web Conf. 198 (2019) 00004 Fulltext: PDF;
In : Quantum Technology International Conference 2018, Paris, France, 5 - 7 Sep 2018, pp.00004
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7.
Measurement of electrons from heavy-flavour hadron decays as a function of multiplicity in p-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV / ALICE Collaboration
The multiplicity dependence of electron production from heavy-flavour hadron decays as a function of transverse momentum was measured in p-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV using the ALICE detector at the LHC. The measurement was performed in the centre-of-mass rapidity interval $-1.07 < y_{\rm cms} < 0.14$ and transverse momentum interval 2 $< p_{\rm T} <$ 16 GeV/$c$. [...]
arXiv:1910.14399; CERN-EP-2019-250.- Geneva : CERN, 2020-02-12 - 29 p. - Published in : JHEP 2002 (2020) 077 Article from SCOAP3: PDFPDFA; Draft (restricted): PDF; Fulltext: PDF; External link: Article from SCOAP3
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8.
$\rm{K}^{*}(892)^{0}$ and $\rm{\phi(1020)}$ production at midrapidity in pp collisions at $\sqrt{s}$ = 8 TeV / ALICE Collaboration
The production of $\rm{K}^{*}(\rm{892})^{0}$ and $\phi(1020)$ in pp collisions at $\sqrt{s}$ = 8 TeV were measured using Run 1 data collected by the ALICE collaboration at the LHC. The $p_{\rm{T}}$-differential yields d$^{\rm 2}N$/d$y$d$p_{\rm{T}}$ in the range 0 $< $ $p_{\rm{T}}$ $ < $ 20 GeV/$c$ for $\rm{K}^{*0}$ and 0.4 $<$ $p_{\rm{T}}$ $<$ 16 GeV/$c$ for $\phi$ have been measured at midrapidity $|y|$ $<$ 0.5. [...]
arXiv:1910.14410; CERN-EP-2019-248.- Geneva : CERN, 2020-08-17 - 15 p. - Published in : Phys. Rev. C 102 (2020) 024912 Draft (restricted): PDF; Fulltext: PDF;
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9.
ASACUSA PROPOSAL FOR ELENA / Hori, Masaki ; Widmann, Eberhard
Addendum of the ASACUSA proposal for ELENA
CERN-SPSC-2019-035 ; SPSC-P-307-ADD-2. - 2019.
Original Document (SPSC-P-307) - Full text
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10.
Measurement of electrons from semileptonic heavy-flavour hadron decays at midrapidity in pp and Pb-Pb collisions at $\sqrt{s_{\rm{NN}}}$ = 5.02 TeV / ALICE Collaboration
The differential invariant cross section as a function of transverse momentum ($p_\rm{T}$) of electrons from semileptonic heavy-flavour hadron decays was measured at mid-rapidity in proton-proton (pp) collisions at $\sqrt{s}=5.02$ TeV in the $p_\rm{T}$ interval 0.5-10 GeV/$c$, as well as the invariant yield in central (0-10%), semi-central (30-50%) and peripheral (60-80%) lead-lead (Pb-Pb) collisions at $\sqrt{s_{\rm{NN}}}=5.02\text{ TeV}$ in the $p_\rm{T}$ intervals 0.5-26 GeV/$c$ (0-10% and 30-50%) and 0.5-10 GeV/$c$ (60-80%). The modification of the electron yield with respect to what is expected for an incoherent superposition of nucleon--nucleon collisions is evaluated by measuring the nuclear modification factor $R_{\mathrm{AA}}$. [...]
arXiv:1910.09110; CERN-EP-2019-205.- Geneva : CERN, 2020-05-10 - 26 p. - Published in : Phys. Lett. B 804 (2020) 135377 Article from SCOAP3: PDF; Draft (restricted): PDF; Fulltext: PDF;
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