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1.
Quantum reflection of antihydrogen from the Casimir potential above matter slabs / Dufour, G. (Paris, Lab. Kastler Brossel) ; Gerardin, A. (Paris, Lab. Kastler Brossel) ; Guerout, R. (Paris, Lab. Kastler Brossel) ; Lambrecht, A. (Paris, Lab. Kastler Brossel) ; Nesvizhevsky, V.V. (Laue-Langevin Inst.) ; Reynaud, S. (Paris, Lab. Kastler Brossel) ; Voronin, A.Yu. (Lebedev Inst.)
We study quantum reflection of antihydrogen atoms from matter slabs due to the van der Waals/Casimir-Polder (vdW/CP) potential. By taking into account the specificities of antihydrogen and the optical properties and width of the slabs we calculate realistic estimates for the potential and quantum reflection amplitudes. [...]
arXiv:1212.5676.- 2013-01-02 - 7 p. - Published in : Phys. Rev. A 87 (2013) 012901 Fulltext: PDF;
2.
Quantum Reflection of Antihydrogen in the GBAR Experiment / Dufour, Gabriel (Paris, Lab. Kastler Brossel) ; Guerout, Romain (Paris, Lab. Kastler Brossel) ; Lambrecht, Astrid (Paris, Lab. Kastler Brossel) ; Nesvizhevsky, Valery (Laue-Langevin Inst.) ; Reynaud, Serge (Paris, Lab. Kastler Brossel) ; Voronin, Alexei (Lebedev Inst.)
In the GBAR experiment, cold antihydrogen atoms will be left to fall on an annihilation plate with the aim of measuring the gravitational acceleration of antimatter. Here, we study the quantum reflection of these antiatoms due to the Casimir-Polder potential above the plate. [...]
arXiv:1312.6018.- 2014 - 8 p. - Published in : Int. J. Mod. Phys.: Conf. Ser. 30 (2014) 1460265 Fulltext: S2010194514602658 - HTM; arXiv:1312.6018 - PDF; External link: Preprint
In : 2nd International Workshop on Antimatter and Gravity, Bern, Switzerland, 13 - 15 Nov 2013, pp.1460265
3.
Prospects for studies of the free fall and gravitational quantum states of antimatter / Dufour, G. (College de France ; Paris, Lab. Kastler Brossel) ; Cassidy, D.B. (University Coll. London) ; Crivelli, P. (Zurich, ETH) ; Debu, P. (IRFU, SPP, Saclay) ; Lambrecht, A. (College de France ; Paris, Lab. Kastler Brossel) ; Nesvizhevsky, V.V. (Laue-Langevin Inst.) ; Reynaud, S. (College de France ; Paris, Lab. Kastler Brossel) ; Voronin, A.Yu. (Lebedev Inst.) ; Wall, T.E. (University Coll. London)
Different experiments are ongoing to measure the effect of gravity on cold neutral antimatter atoms such as positronium, muonium and antihydrogen. Among those, the project GBAR in CERN aims to measure precisely the gravitational fall of ultracold antihydrogen atoms. [...]
arXiv:1409.0705.- 2015 - 16 p. - Published in : Adv. High Energy Phys. 2015 (2015) 379642 Article from SCOAP3: PDF; Fulltext: PDF; External link: Preprint
4.
Shaping the distribution of vertical velocities of antihydrogen in GBAR / Dufour, G. (Paris, Lab. Kastler Brossel) ; Debu, P. (IRFU, Saclay) ; Lambrecht, A. (Paris, Lab. Kastler Brossel) ; Nesvizhevsky, V.V. (Laue-Langevin Inst.) ; Reynaud, S. (Paris, Lab. Kastler Brossel) ; Voronin, A.Yu. (Lebedev Inst.)
GBAR is a project aiming at measuring the free fall acceleration of gravity for antimatter, namely antihydrogen atoms ($\overline{\mathrm{H}}$). Precision of this timing experiment depends crucially on the dispersion of initial vertical velocities of the atoms as well as on the reliable control of their distribution. [...]
arXiv:1312.5534.- 2014-01-30 - 21 p. - Published in : Eur. Phys. J. C 74 (2014) 2731 Article from SCOAP3: PDF; Fulltext: PDF; Fulltext from Publisher: PDF; External link: Preprint
5.
Production of antihydrogen atoms by 6 keV antiprotons through a positronium cloud / Adrich, P. (NCBJ, Swierk) ; Blumer, P. (Zurich, ETH) ; Caratsch, G. (Zurich, ETH) ; Chung, M. (UNIST, Ulsan) ; Cladé, P. (Paris, Lab. Kastler Brossel) ; Comini, P. (IRFU, Saclay) ; Crivelli, P. (Zurich, ETH) ; Dalkarov, O. (Unlisted) ; Debu, P. (IRFU, Saclay) ; Douillet, A. (Paris, Lab. Kastler Brossel ; U. Evry) et al.
We report on the first production of an antihydrogen beam by charge exchange of 6.1 keV antiprotons with a cloud of positronium in the GBAR experiment at CERN. The antiproton beam was delivered by the AD/ELENA facility. [...]
arXiv:2306.15801.- 2023-11-06 - 18 p. - Published in : Eur. Phys. J. C Fulltext: 2306.15801 - PDF; Publication - PDF; Erratum - PDF;
6.
Positron production using a 9 MeV electron linac for the GBAR experiment / Charlton, M. (Swansea U.) ; Choi, J.J. (Seoul Natl. U., Dept. Phys. Astron.) ; Chung, M. (UNIST, Ulsan) ; Cladé, P. (Paris, Lab. Kastler Brossel) ; Comini, P. (IRFU, Saclay) ; Crépin, P.P. (Paris, Lab. Kastler Brossel) ; Crivelli, P. (Zurich, ETH) ; Dalkarov, O. (Lebedev Inst.) ; Debu, P. (IRFU, Saclay) ; Dodd, L. (Swansea U.) et al.
For the GBAR (Gravitational Behaviour of Antihydrogen at Rest) experiment at CERN's Antiproton Decelerator (AD) facility we have constructed a source of slow positrons, which uses a low-energy electron linear accelerator (linac). The driver linac produces electrons of 9 MeV kinetic energy that create positrons from bremsstrahlung-induced pair production. [...]
arXiv:2006.05966.- 2021-01-01 - 33 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 985 (2021) 164657 Fulltext: PDF;
7.
Asymmetric dark matter: residual annihilations and self-interactions / Baldes, Iason (DESY) ; Cirelli, Marco (Paris, LPTHE) ; Panci, Paolo (CERN) ; Petraki, Kalliopi (Paris, LPTHE ; NIKHEF, Amsterdam) ; Sala, Filippo (DESY) ; Taoso, Marco (Madrid, IFT ; INFN, Turin)
Dark matter (DM) coupled to light mediators has been invoked to resolve the putative discrepancies between collisionless cold DM and galactic structure observations. However, $\gamma$-ray searches and the CMB strongly constrain such scenarios. [...]
arXiv:1712.07489; CERN-TH-2017-272; DESY-17-232; NIKHEF-2017-070.- 2018-06-26 - 9 p. - Published in : SciPost Phys. 4 (2018) 041 Fulltext: fulltext1644396 - PDF; arXiv:1712.07489 - PDF;
8.
Positron accumulation in the GBAR experiment / GBAR Collaboration
We present a description of the GBAR positron (e+) trapping apparatus, which consists of a three stage Buffer Gas Trap (BGT) followed by a High Field Penning Trap (HFT), and discuss its performance. The overall goal of the GBAR experiment is to measure the acceleration of the neutral antihydrogen (H) atom in the terrestrial gravitational field by neutralising a positive antihydrogen ion (H+), which has been cooled to a low temperature, and observing the subsequent H annihilation following free fall. [...]
arXiv:2205.04530.- 2022-07-25 - 28 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 1040 (2022) 167263 Fulltext: PDF;
9.
Determination of alpha_s at NLO*+NNLL from a global fit of the low-z parton-to-hadron fragmentation functions in e+e- and DIS collisions / Pérez-Ramos, Redamy (Paris U., IV ; Paris, LPTHE ; Jyvaskyla U.) ; d'Enterria, David (CERN)
The QCD coupling alpha_s is determined from a combined analysis of experimental e+e- and e-p jet data confronted to theoretical predictions of the energy evolution of the parton-to-hadron fragmentation functions (FFs) moments --multiplicity, peak, width, skewness-- at low fractional hadron momentum z. The impact of approximate next-to-leading order (NLO*) corrections plus next-to-next-to-leading log (NNLL) resummations, compared to previous LO+NLL calculations, is discussed. [...]
arXiv:1412.2102.- 2015 - 9 p. - Published in : EPJ Web Conf. 90 (2015) 04001 Fulltext: epjconf_ismd2015_04001 - PDF; arXiv:1412.2102 - PDF; External link: Preprint
10.
The Gbar project, or how does antimatter fall? / Indelicato, Paul (Paris, Lab. Kastler Brossel) ; Chardin, G (CSNSM, Orsay) ; Grandemange, P (CSNSM, Orsay) ; Lunney, D (CSNSM, Orsay) ; Manea, V (CSNSM, Orsay) ; Badertscher, A (Zurich, ETH) ; Crivelli, P (Zurich, ETH) ; Curioni, A (Zurich, ETH) ; Marchionni, A (Zurich, ETH) ; Rossi, B (Zurich, ETH) et al.
The Einstein classical Weak Equivalence Principle states that the trajectory of a particle is independent of its composition and internal structure when it is only submitted to gravitational forces. This fundamental principle has never been directly tested with antimatter. [...]
2014 - 10 p. - Published in : Hyperfine Interact. 228 (2014) 141-150
In : 11th International Conference on Low Energy Antiproton Physics, Uppsala, Sweden, 10 - 15 Jun 2013, pp.141-150

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