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CERN Document Server 47 notices trouvées  1 - 10suivantfin  aller vers la notice: La recherche a duré 0.54 secondes. 
1.
Contribution of exclusive diffractive processes to the measured azimuthal asymmetries in SIDIS / COMPASS Collaboration
Hadron leptoproduction in Semi-Inclusive measurements of Deep-Inelastic Scattering (SIDIS) on unpolarised nucleons allows one to get information on the intrinsic transverse momentum of quarks in a nucleon and on the Boer-Mulders function through the measurement of azimuthal modulations in the cross section. These modulations were recently measured by the HERMES experiment at DESY on proton and deuteron targets, and by the COMPASS experiment using the CERN SPS muon beam and a $^6$LiD target. [...]
arXiv:1912.10322; CERN-EP-2019-286.- Geneva : CERN, 2020-07 - 13 p. - Published in : Nucl. Phys. B 956 (2020) 115039 Article from SCOAP3: PDF; Draft (restricted): PDF; Fulltext: 1912.10322 - PDF; CERN-EP-2019-286 - PDF;
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2.
Measurement of the cross section for hard exclusive $\pi^0$ leptoproduction / COMPASS Collaboration
We report on a measurement of hard exclusive $\pi^0$ muoproduction on the proton by COMPASS using 160 GeV/$c$ polarised $\mu^+$ and $\mu^-$ beams of the CERN SPS impinging on a liquid hydrogen target. From the average of the measured $\mu^+$ and $\mu^-$ cross sections, the virtual-photon proton cross section is determined as a function of the squared four-momentum transfer between initial and final proton in the range $0.08\,(\text{GeV/}c)^2 < |t| < 0.64\,(\text{GeV/}c)^2$. [...]
arXiv:1903.12030; CERN-EP-2019-049.- 2020-06-10 - 9 p. - Published in : Phys. Lett. B 805 (2020) 135454 Article from SCOAP3: PDF; Fulltext: PDF; Fulltext from publisher: PDF;
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3.
A New QCD facility at the M2 beam line of the CERN SPS: COMPASS++/AMBER / Adams, B. (Chicago U., EFI ; Xonics Inc.) ; Aidala, C.A. (Michigan U.) ; Akhunzyanov, R. (Dubna, JINR) ; Alexeev, G.D. (Dubna, JINR) ; Alexeev, M.G. (Turin U.) ; Amoroso, A. (Turin U. ; INFN, Turin) ; Andrieux, V. (Illinois U., Urbana) ; Anfimov, N.V. (Dubna, JINR) ; Anosov, V. (Dubna, JINR) ; Antoshkin, A. (Dubna, JINR) et al.
In this Letter of Intent, we propose a broad experimental programme for the ``New QCD facility at the M2 beam line of the CERN SPS''. [...]
arXiv:1808.00848 ; CERN-SPSC-2019-003 ; SPSC-I-250 ; SPSC-I-250. - 2019. - 91 p.
Full text - Fulltext
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4.
Measurement of $P_T$-weighted Sivers asymmetries in leptoproduction of hadrons / COMPASS Collaboration
The transverse spin asymmetries measured in semi-inclusive leptoproduction of hadrons, when weighted with the hadron transverse momentum $P_T$, allow for the extraction of important transverse-momentum-dependent distribution functions. In particular, the weighted Sivers asymmetries provide direct information on the Sivers function, which is a leading-twist distribution that arises from a correlation between the transverse momentum of an unpolarised quark in a transversely polarised nucleon and the spin of the nucleon. [...]
arXiv:1809.02936; CERN-EP-2018-242.- Geneva : CERN, 2019-03 - 20 p. - Published in : Nucl. Phys. B 940 (2019) 34-53 Article from SCOAP3: PDF; Draft (restricted): PDF; Fulltext: CERN-EP-2018-242 - PDF; 1809.02936 - PDF;
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5.
Light isovector resonances in $\pi^- p \to \pi^-\pi^-\pi^+ p$ at 190 GeV/${\it c}$ / COMPASS Collaboration
We have performed the most comprehensive resonance-model fit of $\pi^-\pi^-\pi^+$ states using the results of our previously published partial-wave analysis (PWA) of a large data set of diffractive-dissociation events from the reaction $\pi^- + p \to \pi^-\pi^-\pi^+ + p_\text{recoil}$ with a 190 GeV/$c$ pion beam. The PWA results, which were obtained in 100 bins of three-pion mass, $0.5 < m_{3\pi} < 2.5$ GeV/$c^2$, and simultaneously in 11 bins of the reduced four-momentum transfer squared, $0.1 < t' < 1.0$ $($GeV$/c)^2$, are subjected to a resonance-model fit using Breit-Wigner amplitudes to simultaneously describe a subset of 14 selected waves using 11 isovector light-meson states with $J^{PC} = 0^{-+}$, $1^{++}$, $2^{++}$, $2^{-+}$, $4^{++}$, and spin-exotic $1^{-+}$ quantum numbers. [...]
arXiv:1802.05913; CERN-EP-2018-021.- Geneva : CERN, 2018-11-02 - 72 p. - Published in : Phys. Rev. D 98 (2018) 092003 Article from SCOAP3: PDF; Draft (restricted): PDF; Fulltext: CERN-EP-2018-021 - PDF; 1802.05913 - PDF;
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6.
Transverse extension of partons in the proton probed in the sea-quark range by measuring the DVCS cross section / COMPASS Collaboration
We report on the first measurement of exclusive single-photon muoproduction on the proton by COMPASS using 160 GeV/$c$ polarized $\mu^+$ and $\mu^-$ beams of the CERN SPS impinging on a liquid hydrogen target. We determine the dependence of the average of the measured $\mu^+$ and $\mu^-$ cross sections for deeply virtual Compton scattering on the squared four-momentum transfer $t$ from the initial to the final final proton. [...]
arXiv:1802.02739; CERN-EP-2018-016.- Geneva : CERN, 2019-06-10 - 7 p.
Article from SCOAP3: PDF; Draft (restricted): PDF; Fulltext: 1802.02739 - PDF; CERN-EP-2018-016 - PDF; Fulltext from publisher: PDF;
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7.
K$^{-}$ over K$^{+}$ multiplicity ratio for kaons produced in DIS with a large fraction of the virtual-photon energy / COMPASS Collaboration
The K$^{-}$ over K$^{+}$ multiplicity ratio is measured in deep-inelastic scattering, for the first time for kaons carrying a large fraction $z$ of the virtual-photon energy. The data were obtained by the COMPASS collaboration using a 160 GeV muon beam and an isoscalar $^6$LiD target. [...]
arXiv:1802.00584; CERN-EP-2018-012.- Geneva : CERN, 2018-11-10 - 9 p. - Published in : Phys. Lett. B 786 (2018) 390-398 Article from SCOAP3: PDF; Draft (restricted): PDF; Fulltext: CERN-EP-2018-012 - PDF; 1802.00584 - PDF; arXiv:1802.00584 - PDF;
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8.
Results on longitudinal spin physics at COMPASS / Wilfert, Malte (Mainz U., Inst. Kernphys.) /COMPASS
The COMPASS experiment at the CERN SPS has taken data on deep inelastic scattering of polarised muons on a polarised NH$_{3}$ target in 2007 and 2011 and on a polarised LiD target in 2002-2004 and 2006. The new results on the longitudinal double spin asymmetry $A_{1}^{p}$ and the spin-dependent structure function $g_{1}^{p}$ obtained from the 2011 data set are presented [...]
2016 - 6 p. - Published in : EPJ Web Conf. 112 (2016) 01023 Fulltext: PDF;
In : 6th International Conference on the Physics Opportunities at an ElecTron-Ion Collider, Palaiseau, France, 7 - 11 Sep 2015, pp.01023
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9.
Results on longitudinal spin physics at COMPASS / Wilfert, Malte (Mainz U., Inst. Kernphys.) /COMPASS
The COMPASS experiment at the CERN SPS has taken data for deep inelastic scattering of polarised muons off a polarised NH 3 target in 2007 and 2011 and off a polarised 6 LiD target in 2002–2004 and 2006..
2016 - 5 p. - Published in : Nucl. Part. Phys. Proc. 270-272 (2016) 41-45
In : 18th High-Energy Physics International Conference in Quantum Chromodynamics, Montpellier, France, 29 Jun - 03 Jul 2015, pp.41-45
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10.
Final results on the spin dependent structure function $g_1^d$ from COMPASS / Wilfert, Malte (Mainz U.) /COMPASS
In 2002-2004 the COMPASS experiment at the CERN SPS has taken data with a polarised muon beam scattering off a polarised LiD target. The same measurement was also performed in 2006 increasing the statistics by roughly a factor of two. [...]
SISSA, 2016 - 6 p. - Published in : PoS DIS2016 (2016) 228 Fulltext: PDF; External link: PoS server
In : 24th International Workshop on Deep Inelastic Scattering and related subjects, Hamburg, Germany, 11 - 15 Apr 2016, pp.228
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Voir aussi: noms d'auteurs similaires
30 Wilfert, M
5 Wilfert, Malte
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