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CERN Document Server 36 records found  1 - 10nextend  jump to record: Search took 1.15 seconds. 
1.
First measurement of the Sivers asymmetry for gluons from SIDIS data / COMPASS Collaboration
The Sivers function describes the correlation between the transverse spin of a nucleon and the transverse motion of its partons. It was extracted from measurements of the azimuthal asymmetry of hadrons produced in semi-inclusive deep inelastic scattering of leptons off transversely polarised nucleon targets, and it turned out to be non-zero for quarks. [...]
arXiv:1701.02453; CERN-EP-2017-003.- Geneva : CERN, 2017-09-10 - 11 p. - Published in : Phys. Lett. B 772 (2017) 854-864 Article from SCOAP3: PDF; Draft (restricted): PDF; Fulltext: CERN-EP-2017-003 - PDF; arXiv:1701.02453 - PDF;
2.
Final COMPASS results on the deuteron spin-dependent structure function $g_1^{\rm d}$ and the Bjorken sum rule / COMPASS Collaboration
Final results are presented from the inclusive measurement of deep-inelastic polarised-muon scattering on longitudinally polarised deuterons using a $^6$LiD target. The data were taken at $160~{\rm GeV}$ beam energy and the results are shown for the kinematic range $1~({\rm GeV}/c)^2 < Q^2 < 100~({\rm GeV}/c)^2$ in photon virtuality, $0.004 4~{\rm GeV}/c^2$ in the mass of the hadronic final state. [...]
arXiv:1612.00620; CERN-EP-2016-299.- Geneva : CERN, 2017-06-10 - 8 p. - Published in : Phys. Lett. B 769 (2017) 34-41 Article from SCOAP3: PDF; Fulltext: PDF;
3.
Sivers asymmetry extracted in SIDIS at the hard scales of the Drell–Yan process at COMPASS / COMPASS Collaboration
Proton transverse-spin azimuthal asymmetries are extracted from the COMPASS 2010 semi-inclusive hadron measurements in deep inelastic muon-nucleon scattering in those four regions of the photon virtuality $Q^2$, which correspond to the four regions of the di-muon mass $\sqrt{Q^2}$ used in the ongoing analysis of the COMPASS Drell-Yan measurements. This allows for a future direct comparison of the nucleon transverse-momentum-dependent parton distribution functions extracted from these two alternative measurements. [...]
arXiv:1609.07374; CERN-EP-2016-250; CERN-EP-2016--250.- Geneva : CERN, 2017-07-10 - 8 p. - Published in : Phys. Lett. B 770 (2017) 138-145 Article from SCOAP3: PDF; Fulltext: PDF; External link: Preprint
4.
Azimuthal asymmetries of charged hadrons produced in high-energy muon scattering off longitudinally polarised deuterons / Adolph, C. (U. Erlangen-Nuremberg (main)) ; Aghasyan, M (INFN, Trieste) ; Akhunzyanov, R (Dubna, JINR) ; Alexeev, M G (Turin U.) ; Alexeev, G D (Dubna, JINR) ; Amoroso, A (INFN, Turin ; Turin U.) ; Andrieux, V (IRFU, Saclay) ; Anfimov, N V (Dubna, JINR) ; Anosov, V (Dubna, JINR) ; Augsten, K (CTU, Prague ; Dubna, JINR) et al.
Single hadron azimuthal asymmetries of positive and negative hadrons produced in muon semi-inclusive deep inelastic scattering off longitudinally polarised deuterons are determined using the 2006 COMPASS data and also combined all deuteron COMPASS data. For each hadron charge, the dependence of the azimuthal asymmetry on the hadron azimuthal angle $\phi$ is obtained by means of a five-parameter fitting function that besides a $\phi$-independent term includes four modulations predicted by theory: $\sin\phi$, $\sin 2 \phi$, $\sin 3\phi$ and $\cos\phi$. [...]
arXiv:1609.06062; CERN-EP-2016-245.- Geneva : CERN, 2018-11-19 - 15 p. - Published in : Eur. Phys. J. C Article from SCOAP3: PDF; Fulltext: PDF; External link: Preprint
5.
Multiplicities of charged kaons from deep-inelastic muon scattering off an isoscalar target / COMPASS Collaboration
Precise measurements of charged-kaon multiplicities in deep inelastic scattering were performed. The results are presented in three-dimensional bins of the Bjorken scaling variable x, the relative virtual-photon energy y, and the fraction z of the virtual-photon energy carried by the produced hadron. [...]
arXiv:1608.06760; CERN-EP-2016-206.- 2017-04-10 - 9 p. - Published in : Phys. Lett. B 767 (2017) 133-141 Article from SCOAP3: PDF; Fulltext: PDF; External link: Preprint
6.
Exclusive $\omega$ meson muoproduction on transversely polarised protons / COMPASS Collaboration
Exclusive production of $\omega$ mesons was studied at the COMPASS experiment by scattering $160~\mathrm{GeV}/\mathit{c}$ muons off transversely polarised protons. Five single-spin and three double-spin azimuthal asymmetries were measured in the range of photon virtuality $1~(\mathrm{GeV}/\mathit{c})^2 < Q^2 < 10~(\mathrm{GeV}/\mathit{c})^2$, Bjorken scaling variable $0.003 < x_{\mathit{Bj}} < 0.3$ and transverse momentum squared of the $\omega$ meson $0.05~(\mathrm{GeV}/\mathit{c})^2 < p_{T}^{2} < 0.5~(\mathrm{GeV}/\mathit{c})^2$. [...]
arXiv:1606.03725; CERN-EP-2016-157.- Geneva : CERN, 2017-02 - 22 p. - Published in : Nucl. Phys. B 915 (2017) 454-475 Article from SCOAP3: PDF; Fulltext: arXiv:1606.03725 - PDF; 1606.03725 - PDF; External link: Preprint
7.
Multiplicities of charged pions and charged hadrons from deep-inelastic scattering of muons off an isoscalar target / COMPASS Collaboration
Multiplicities of charged pions and unidentified hadrons produced in deep-inelastic scattering were measured in bins of the Bjorken scaling variable $x$, the relative virtual-photon energy $y$ and the relative hadron energy $z$. Data were obtained by the COMPASS Collaboration using a 160 GeV muon beam and an isoscalar target ($^6$LiD). [...]
arXiv:1604.02695; CERN-EP-2016-095.- Geneva : CERN, 2017-01-10 - 10 p. - Published in : Phys. Lett. B 764 (2017) 1-10 Article from SCOAP3: PDF; Elsevier Open Access article: PDF; Fulltext: PDF; External link: Preprint
8.
Leading-order determination of the gluon polarisation from semi-inclusive deep inelastic scattering data / COMPASS collaboration
Using a novel analysis technique, the gluon polarisation in the nucleon is re-evaluated using the longitudinal double-spin asymmetry measured in the cross section of semi-inclusive single-hadron muoproduction with photon virtuality $Q^2>1~({\rm GeV}/c)^2$. The data were obtained by the COMPASS experiment at CERN using a 160 GeV/$c$ polarised muon beam impinging on a polarised $^6$LiD target. [...]
arXiv:1512.05053; CERN-PH-EP-2015-328.- Geneva : CERN, 2017-04-03 - 14 p. - Published in : Eur. Phys. J. C 77 (2017) 209 Article from SCOAP3: PDF; Fulltext: arXiv:1512.05053 - PDF; CERN-PH-EP-2015-328 - PDF; Springer Open Access article: PDF;
9.
Longitudinal double spin asymmetries in single hadron quasi-real photoproduction at high $p_T$ / COMPASS Collaboration
We measured the longitudinal double spin asymmetries $A_{LL}$ for single hadron muo-production off protons and deuterons at photon virtuality $Q^2$ < 1(GeV/$\it c$)$^2$ for transverse hadron momenta $p_T$ in the range 0.7 GeV/$\it c$ to 4 GeV/$\it c$ . They were determined using COMPASS data taken with a polarised muon beam of 160 GeV/$\it c$ or 200 GeV/$\it c$ impinging on polarised $\mathrm{{}^6LiD}$ or $\mathrm{NH_3}$ targets. [...]
arXiv:1509.03526; CERN-PH-EP-2015-245.- Geneva : CERN, 2016-02-10 - 7 p. - Published in : Phys. Lett. B 753 (2016) 573-579 Article from SCOAP3: PDF; Fulltext: PDF; Preprint: PDF; External link: Preprint
10.
Resonance Production and $\pi\pi$ S-wave in $\pi^- + p \rightarrow \pi^- \pi^- \pi^+ + p_{recoil}$ at 190 GeV/c / COMPASS collaboration
The COMPASS collaboration has collected the currently largest data set on diffractively produced $\pi^-\pi^-\pi^+$ final states using a negative pion beam of 190 GeV/c momentum impinging on a stationary proton target. This data set allows for a systematic partial-wave analysis in 100 bins of three-pion mass, $0.5 < m_{3\pi} < 2.5$ GeV/c$^2$ , and in 11 bins of the reduced four-momentum transfer squared, $0.1 < t < 1.0$ (GeV/c)$^2$ . [...]
arXiv:1509.00992; CERN-PH-EP-2015-233.- Geneva : CERN, 2017-02-16 - 59 p. - Published in : Phys. Rev. D 95 (2017) 032004 APS Open Access article: PDF; Draft (restricted): PDF; Fulltext: arXiv:1509.00992 - PDF; 10.1103_PhysRevD.95.032004 - PDF; External link: Preprint

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34 Adolph, C.
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