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Measurement of the hard exclusive $\pi^{0}$ muoproduction cross section at COMPASS / COMPASS Collaboration
A new and detailed measurement of the cross section for hard exclusive neutral-pion muoproduction on the proton was performed in a wide kinematic region, with the photon virtuality

$Q^2$ ranging from 1 to 8 (GeV/

$c$ )

$^{\rm\, 2}$ and the Bjorken variable

$x_{\rm Bj}$ ranging from 0.02 to 0.45. [...]
CERN-EP-2024-346 ; arXiv:2412.19923. -
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Multiplicities of positive and negative pions, kaons and unidentified hadrons from deep-inelastic scattering of muons off a liquid hydrogen target / Alexeev, G.D. (Unlisted) ; Alexeev, M.G. (INFN, Turin ; U. Turin (main)) ; Alice, C. (INFN, Turin ; U. Turin (main)) ; Amoroso, A. (INFN, Turin ; U. Turin (main)) ; Andrieux, V. (Illinois U., Urbana (main)) ; Anosov, V. (Unlisted) ; Augsten, K. (Prague, Tech. U.) ; Augustyniak, W. (NCBJ, Warsaw) ; Azevedo, C.D.R. (Aveiro U.) ; Badelek, B. (Warsaw U.) et al.
The multiplicities of positive and negative pions, kaons and unidentified hadrons produced in deep-inelastic scattering are measured in bins of the Bjorken scaling variable

$x$ , the relative virtual-photon energy

$y$ and the fraction of the virtual-photon energy transferred to the final-state hadron

$z$ . [...]
CERN-EP-2024-270 ; arXiv:2410.12005. - 22.
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DRD1 Extended R&D Proposal / Colaleo, Anna (Universita e INFN, Bari (IT)) ; Ropelewski, Leszek (CERN) ; Abbrescia, Marcello (INFN Bari) ; Aielli, Giulio (INFN Tor Vergata) ; Baracchini, Elisabetta (GSSI) ; Bortfeldt, Jonathan (LMU) ; Borysova, Maryna (WIS) ; Breskin, Amos (WIS) ; Bregant, Marco (Instituto de Física da Universidade de São Paulo) ; Brunbauer, Florian Maximilian (CERN) et al.
This document realized in the framework of the newly established Gaseous Detector R&D Collaboration (DRD1), presents a comprehensive overview of the current state-of-the-art and the challenges related to various gaseous detector concepts and technologies. [...]
CERN-DRDC-2024-003 ; DRDC-P-DRD1. - 2024.
DRD1 Extended R&D Proposal

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High-Statistics Measurement of Collins and Sivers Asymmetries for Transversely Polarized Deuterons / COMPASS Collaboration
New results are presented on a high-statistics measurement of Collins and Sivers asymmetries of charged hadrons produced in deep inelastic scattering of muons on a transversely polarised

$^6$ LiD target. The data were taken in 2022 with the COMPASS spectrometer using the 160 \gevv muon beam at CERN, balancing the existing data on transversely polarised proton targets. [...]
arXiv:2401.00309; CERN-EP-2023-308.- 2024-09-05 - 10 p. - Published in : Phys. Rev. Lett. 133 (2024) 101903 Fulltext: 2401.00309 - PDF; Publication - PDF;

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Final COMPASS results on the transverse-spin-dependent azimuthal asymmetries in the pion-induced Drell-Yan process / COMPASS Collaboration
The COMPASS Collaboration performed measurements of the Drell-Yan process in 2015 and 2018 using a 190 GeV/c

$\pi^{-}$ beam impinging on a transversely polarised ammonia target. Combining the data of both years, we present final results on the amplitudes of the five azimuthal modulations in the dimuon production cross section. [...]
arXiv:2312.17379; CERN-EP-2023-307.- 2024-08-14 - 8 p. - Published in : Phys. Rev. Lett. 133 (2024) 071902 Fulltext: 2312.17379 - PDF; Publication - PDF;

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The COMPASS RICH-1 MPGD based photon detector performance / Agarwala, J (ICTP, Trieste ; INFN, Pavia ; Pavia U.) ; Alexeev, M (INFN, Turin) ; Azevedo, C D R (Aveiro U.) ; Bradamante, F (Trieste U. ; INFN, Trieste) ; Bressan, A (Trieste U. ; INFN, Trieste) ; Büchele, M (Freiburg U.) ; Chatterjee, C (Trieste U. ; INFN, Trieste) ; Chiosso, M (INFN, Turin ; Turin U.) ; Cicuttin, A (ICTP, Trieste) ; Ciliberti, P (INFN, Trieste) et al.
In 2016 we have upgraded the COMPASS RICH by novel gaseous photon detectors based on MPGD technology. Four new photon detectors, covering a total active area of 1.5 m

$^{2}$ , have been installed in order to cope with the challenging efficiency and stability requirements of the COMPASS physics programme. [...]
2022 - 5 p. - Published in : J. Phys. : Conf. Ser. 2374 (2022) 012126 Fulltext: PDF;
In : International Conference on Technology and Instrumentation in Particle Physics (TIPP 2021), Online, Canada, 24 - 29 May 2021, pp.012126

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Transverse-spin-dependent azimuthal asymmetries of pion and kaon pairs produced in muon-proton and muon-deuteron semi-inclusive deep inelastic scattering / COMPASS Collaboration
A set of measurements of azimuthal asymmetries in the production of pairs of identified hadrons in deep-inelastic scattering of muons on transversely polarised 6LiD (deuteron) and NH3 (proton) targets is presented. All available data collected in the years 2002–2004 and 2007/2010 with the COMPASS spectrometer using a muon beam of 160 GeV=c at the CERN SPS were analysed. [...]
arXiv:2301.02013; CERN-EP-2022-292.- Geneva : CERN, 2023-08-29 - 11 p. - Published in : Phys. Lett. B 845 (2023) 138155 Draft (restricted): PDF; Fulltext: 2301.02013 - PDF; CERN-EP-2022-292 - PDF; Publication - PDF;

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Collins and Sivers transverse-spin asymmetries in inclusive muoproduction of $\rho^0$ mesons / COMPASS Collaboration
The production of vector mesons in deep inelastic scattering is an interesting yet scarsely explored channel to study the transverse spin structure of the nucleon and the related phenomena. The COMPASS collaboration has performed the first measurement of the Collins and Sivers asymmetries for inclusively produced

$\rho^0$ mesons. [...]
arXiv:2211.00093; CERN-EP-2022-234; CERN-EP-2022--234.- Geneva : CERN, 2023-06-16 - 9 p. - Published in : Phys. Lett. B 843 (2023) 137950 Draft (restricted): PDF; Fulltext: CERN-EP-2022-234_2 - PDF; 2211.00093 - PDF; Publication - PDF;

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Spin density matrix elements in exclusive $\rho ^0$ meson muoproduction / COMPASS Collaboration
We report on a measurement of Spin Density Matrix Elements (SDMEs) in hard exclusive

$\rho ^0$ meson muoproduction at COMPASS using 160~GeV/

$c$ polarised

$\mu ^{+}$ and

$\mu ^{-}$ beams impinging on a liquid hydrogen target. The measurement covers the kinematic range 5.0~GeV/

$c^2$

$< W <$ 17.0~GeV/

$c^2$ , 1.0 (GeV/

$c$ )

$^2$

$< Q^2 <$ 10.0 (GeV/

$c$ )

$^2$ and 0.01 (GeV/

$c$ )

$^2$

$< p_{\rm{T}}^2 <$ 0.5 (GeV/

$c$ )

$^2$ . [...]
arXiv:2210.16932; CERN-EP-2022-231.- Geneva : CERN, 2023-10-13 - 32 p. - Published in : Eur. Phys. J. C 83 (2023) 924 Draft (restricted): PDF; Fulltext: 2210.16932 - PDF; CERN-EP-2022-231 - PDF; Publication - PDF;

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10.

Double J/ψ production in pion-nucleon scattering at COMPASS / COMPASS Collaboration
We present the study of the production of double

$J/\psi$ mesons using COMPASS data collected with a 190

$\GeV/c$

$\pi^-$ beam scattering off NH

$_{3}$ , Al and W targets. Kinematic distributions of the collected double

$J/\psi$ events are analysed, and the double

$J/\psi$ production cross section is estimated for each of the COMPASS targets. [...]
arXiv:2204.01817; CERN-EP-2022-073.- Geneva : CERN, 2023-03-10 - 8 p. - Published in : Phys. Lett. B 838 (2023) 137702 Fulltext: CERN-EP-DRAFT-COMPASS-2022-001 - PDF; 2204.01817 - PDF; Publication - PDF;

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Veja também: nomes de autores similares
1	Veloso, J F C A
9	Veloso, J F C
43	Veloso, J F C A
1	Veloso, J F.C A
37	Veloso, J.
1	Veloso, J.F. C.A.
31	Veloso, J.F.C.A.
2	Veloso, JFCA.
1	Veloso, Joao
1	Veloso, Joao Filipe Calapez de Albuquerque
1	Veloso, Jose Miguel Martins
3	Veloso, João F C A

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