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1.
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;
2.
Nuclear modification of $\Upsilon$ states in pPb collisions at $\sqrt{s_\mathrm{NN}}$ = 5.02 TeV / CMS Collaboration
Production cross sections of $\Upsilon$(1S), $\Upsilon$(2S), and $\Upsilon$(3S) states decaying into ${\mu^{+}\mu^{-}}$ in proton-lead (pPb) collisions are reported using data collected by the CMS experiment at ${\sqrt {\smash [b]{s_{_{\mathrm {NN}}}}}} = $ 5.02 TeV. A comparison is made with corresponding cross sections obtained with pp data measured at the same collision energy and scaled by the Pb nucleus mass number. [...]
arXiv:2202.11807; CMS-HIN-18-005; CERN-EP-2020-181; CMS-HIN-18-005-004.- Geneva : CERN, 2022-08-28 - 40 p. - Published in : Phys. Lett. B 835 (2022) 137397 Fulltext: jt - PDF; CMS-HIN-18-005-arXiv - PDF; 2202.11807 - PDF; Fulltext from Publisher: PDF; Fulltext from publisher: PDF; External link: Fermilab Library Server
3.
A pulsed high-voltage decelerator system to deliver low-energy antiprotons / Husson, A (IJCLab, Orsay) ; Kim, B H (Seoul Natl. U., Dept. Phys. Astron.) ; Welker, A (CERN) ; 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-CSCS/SCSC) et al.
The GBAR (Gravitational Behavior of Antihydrogen at Rest) experiment at CERN requires efficient deceleration of 100 keV antiprotons provided by the new ELENA synchrotron ring to synthesize antihydrogen. This is accomplished using electrostatic deceleration optics and a drift tube that is designed to switch from -99 kV to ground when the antiproton bunch is inside – essentially a charged particle “elevator” – producing a 1 keV pulse. [...]
2021 - 7 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 1002 (2021) 165245
4.
First measurement of large area jet transverse momentum spectra in heavy-ion collisions / CMS Collaboration
Jet production in lead-lead (PbPb) and proton-proton (pp) collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV is studied with the CMS detector at the LHC, using PbPb and pp data samples corresponding to integrated luminosities of 404 $\mu$b$^{-1}$ and 27.4 pb$^{-1}$, respectively. Jets with different areas are reconstructed using the anti-$k_{\mathrm{T}}$ algorithm by varying the distance parameter $R$. [...]
arXiv:2102.13080; FERMILAB-PUB-21-160-CMS; CMS-HIN-18-014; CERN-EP-2020-226; CMS-HIN-18-014-004.- Geneva : CERN, 2021-05-31 - 48 p. - Published in : JHEP 2105 (2021) 284 Article from SCOAP3: PDF; Fulltext: CMS-HIN-18-014-arXiv - PDF; 2102.13080 - PDF; External links: Additional information for the analysis; CMS AuthorList
5.
Evidence for X(3872) in Pb-Pb Collisions and Studies of its Prompt Production at $\sqrt {s_{NN}}$=5.02  TeV / CMS Collaboration
The first evidence for X(3872) production in relativistic heavy ion collisions is reported. The X(3872) production is studied in lead-lead (PpPb) collisions at a center-of-mass energy of ${\sqrt {\smash [b]{s_{_{\mathrm {NN}}}}}} = $ 5.02 TeV per nucleon pair, using the decay chain ${\mathrm{X}(3872)} \to \mathrm{J}/\psi\,\pi^{+}\pi^{-}\to \mu^{+}\mu^{-}\pi^{+}\pi^{-}$. [...]
arXiv:2102.13048; CMS-HIN-19-005; CERN-EP-2021-023; CMS-HIN-19-005-003.- Geneva : CERN, 2022-01-19 - 18 p. - Published in : Phys. Rev. Lett. 128 (2022) 032001 Fulltext: 2102.13048 - PDF; CMS-HIN-19-005-arXiv - PDF; Fulltext from Publisher: PDF; External links: Additional information for the analysis; CMS AuthorList
6.
Accumulation of Positrons from a LINAC Based Source / GBAR Collaboration
The GBAR experiment aims to measure the gravitational acceleration of antihydrogen H. It will use H + ions formed by the interaction of antiprotons with a dense positronium cloud, which will require about $10^{10}$ positrons to produce one H + [...]
2020 - 3 p. - Published in : Acta Phys. Pol. A 137 (2020) 164-166
In : 15th International Workshop on Slow Positron Beam Techniques and Applications, Prague, Czechia, 2-6 Sep 2019, pp.164-166
7.
Development of a PbWO$_4$ Detector for Single-Shot Positron Annihilation Lifetime Spectroscopy at the GBAR Experiment / Kim, B H (Seoul Natl. U.) ; Choi, J J (Seoul Natl. U.) ; Chung, M (UNIST, Ulsan) ; Cladé, P (Paris, Lab. Kastler Brossel) ; Comini, P (IRFU, Saclay) ; Crivelli, P (Zurich, ETH) ; Crépin, P-P (Paris, Lab. Kastler Brossel) ; Dalkarov, O (Lebedev Inst.) ; Debu, P (IRFU, Saclay) ; Dodd, L (Swansea U.) et al.
We have developed a PbWO$_{4}$ (PWO) detector with a large dynamic range to measure the intensity of a positron beam and the absolute density of the ortho-positronium ($\mathrm{o-Ps}$) cloud it creates. A simulation study shows that a setup based on such detectors may be used to determine the angular distribution of the emission and reflection of $\mathrm{o-Ps}$ to reduce part of the uncertainties of the measurement. [...]
2020 - 4 p. - Published in : Acta Phys. Pol. A 137 (2020) 122-125
In : 15th International Workshop on Slow Positron Beam Techniques and Applications, Prague, Czechia, 2-6 Sep 2019, pp.122-125
8.
The very forward CASTOR calorimeter of the CMS experiment / CMS Collaboration
The physics motivation, detector design, triggers, calibration, alignment, simulation, and overall performance of the very forward CASTOR calorimeter of the CMS experiment are reviewed. The CASTOR Cherenkov sampling calorimeter is located very close to the LHC beam line, at a radial distance of about 1 cm from the beam pipe, and at 14.4 m from the CMS interaction point, covering the pseudorapidity range of $-6.6 < \eta < -5.2$. [...]
arXiv:2011.01185; CMS-PRF-18-002; CERN-EP-2020-180; CMS-PRF-18-002; CERN-EP-2020-180; CMS-PRF-18-002-003.- Geneva : CERN, 2021-02-08 - 65 p. - Published in : JINST 16 (2021) P02010 Fulltext: 2011.01185 - PDF; fermilab-pub-20-696-cms-scd - PDF; CMS-PRF-18-002-arxiv - PDF; Fulltext from Publisher: PDF; External link: Fermilab Library Server
9.
Measurement of prompt ${\mathrm{D^0}}$ and ${\mathrm{\overline{D}}{}^0}$ meson azimuthal anisotropy and search for strong electric fields in PbPb collisions at ${\sqrt {\smash [b]{s_{_{\mathrm {NN}}}}}} = $5.02 TeV / CMS Collaboration
The strong Coulomb field created in ultrarelativistic heavy ion collisions is expected to produce a rapidity-dependent difference ($\Delta v_{2}$) in the second Fourier coefficient of the azimuthal distribution (elliptic flow, $v_{2}$) between ${\mathrm{D^0}}$ ($\mathrm{\bar{u}}\mathrm{c}$) and ${\mathrm{\overline{D}}{}^0}$ ($\mathrm{u}\mathrm{\bar{c}}$) mesons. Motivated by the search for evidence of this field, the CMS detector at the LHC is used to perform the first measurement of $\Delta v_{2}$. [...]
arXiv:2009.12628; CMS-HIN-19-008; CERN-EP-2020-155; CMS-HIN-19-008-003.- Geneva : CERN, 2021-05-10 - 25 p. - Published in : Phys. Lett. B 816 (2021) 136253 Article from SCOAP3: PDF; Fulltext: 2009.12628 - PDF; CMS-HIN-19-008-arXiv - PDF; External links: Additional information for the analysis; CMS AuthorList
10.
Studies of charm and beauty hadron long-range correlations in pp and pPb collisions at LHC energies / CMS Collaboration
Measurements of the second Fourier harmonic coefficient ($v_2$) of the azimuthal distributions of prompt and nonprompt ${\mathrm{D^0}}$ mesons (the latter coming from beauty hadron decays) produced in pp and pPb collisions are presented. The data samples are collected by the CMS experiment at nucleon-nucleon center-of-mass energies of 13 and 8.16 TeV, respectively. [...]
arXiv:2009.07065; CMS-HIN-19-009; CERN-EP-2020-141; CMS-HIN-19-009-003.- Geneva : CERN, 2021-02-10 - 37 p. - Published in : Phys. Lett. B 813 (2021) 136036 Article from SCOAP3: PDF; Fulltext: HIN-19-009_arXiv - PDF; 2009.07065 - PDF; External links: Additional information for the analysis; CMS AuthorList

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