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CERN Document Server 39 records found  1 - 10próximoend  jump to record: Search took 0.58 seconds. 
1.
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
2.
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
3.
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;
4.
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
5.
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
6.
Interplay among transversity induced asymmetries in hadron leptoproduction / COMPASS Collaboration
In the fragmentation of a transversely polarized quark several left-right asymmetries are possible for the hadrons in the jet. When only one unpolarized hadron is selected, it exhibits an azimuthal modulation known as Collins effect. [...]
arXiv:1507.07593; CERN-PH-EP-2015-199; CERN-PH-EP-2015-199.- Geneva : CERN, 2016-02-10 - 6 p. - Published in : Phys. Lett. B 753 (2016) 406-411 Article from SCOAP3: PDF; Elsevier Open Access article: PDF; Fulltext: PDF; External link: Preprint
7.
The Spin Structure Function $g_1^{\rm p}$ of the Proton and a Test of the Bjorken Sum Rule / COMPASS Collaboration
New results for the double spin asymmetry $A_1^{\rm p}$ and the proton longitudinal spin structure function $g_1^{\rm p}$ are presented. They were obtained by the COMPASS collaboration using polarised 200 GeV muons scattered off a longitudinally polarised NH$_3$ target. [...]
arXiv:1503.08935; CERN-PH-EP-2015-085; CERN-PH-EP-2015-085.- Geneva : CERN, 2016-02-10 - 11 p. - Published in : Phys. Lett. B 753 (2016) 18-28 Article from SCOAP3: PDF; Draft (restricted): PDF; Elsevier Open Access article: PDF; Fulltext: arXiv:1503.08935 - PDF; CERN-PH-EP-2015-085 - PDF; External link: Preprint
8.
Observation of a new narrow axial-vector meson $a_1(1420)$ / COMPASS collaboration
The COMPASS collaboration at CERN has measured diffractive dissociation of 190 GeV$/c$ pions into the $\pi^-\pi^-\pi^+$ final state using a stationary hydrogen target. A partial-wave analysis (PWA) was performed in bins of $3\pi$ mass and four-momentum transfer using the isobar model and the so far largest PWA model consisting of 88~waves. [...]
arXiv:1501.05732; CERN-PH-EP-2015-015; CERN-PH-EP-2015-015.- Geneva : CERN, 2015-08-19 - 6 p. - Published in : Phys. Rev. Lett. 115 (2015) 082001 APS Open Access article: PDF; Draft (restricted): PDF; Fulltext: CERN-PH-EP-2015-015 - PDF; arXiv:1501.05732 - PDF; External link: Preprint
9.
The COMPASS Setup for Physics with Hadron Beams / COMPASS Collaboration
The main characteristics of the COMPASS experimental setup for physics with hadron beams are described. This setup was designed to perform exclusive measurements of processes with several charged and/or neutral particles in the final state. [...]
arXiv:1410.1797; CERN-PH-EP-2014-247; CERN-PH-EP-2014-247.- Geneva : CERN, 2015-04-11 - 47 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 779 (2015) 69-115 Draft (restricted): PDF; Elsevier Open Access article: PDF; Fulltext: arXiv:1410.1797 - PDF; CERN-PH-EP-2014-247 - PDF; External link: Preprint
10.
Collins and Sivers asymmetries in muonproduction of pions and kaons off transversely polarised proton / COMPASS collaboration
Measurements of the Collins and Sivers asymmetries for charged pions and charged and neutral kaons produced in semi-inclusive deep-inelastic scattering of high energy muons off transversely polarised protons are presented. The results were obtained using all the available COMPASS proton data, which were taken in the years 2007 and 2010. [...]
arXiv:1408.4405; CERN-PH-EP-2014-213; CERN-PH-EP-2014-213.- Geneva : CERN, 2015-03-31 - 10 p. - Published in : Phys. Lett. B 744 (2015) 250-259 Article from SCOAP3: PDF; Draft (restricted): PDF; Elsevier Open Access article: PDF; Fulltext: CERN-PH-EP-2014-213 - PDF; arXiv:1408.4405 - PDF; External link: Preprint

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29 Michigami, T
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