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CERN Document Server 17 notices trouvées  1 - 10suivant  aller vers la notice: La recherche a duré 0.53 secondes. 
1.
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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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;
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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;
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4.
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
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5.
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
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6.
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
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7.
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
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8.
Odd and Even Partial Waves of $\eta\pi^-$ and $\eta'\pi^-$ in $\pi^-p\to\eta^{(\prime)}\pi^-p$ at $191\,\textrm{GeV}/c$ / COMPASS Collaboration
Exclusive production of $\eta\pi^-$ and $\eta'\pi^-$ has been studied with a $191\,\textrm{GeV}/c$ $\pi^-$ beam impinging on a hydrogen target at COMPASS (CERN). Partial-wave analyses reveal different odd/even angular momentum ($L$) characteristics in the inspected invariant mass range up to $3\,\textrm{GeV}/c^2$. [...]
arXiv:1408.4286; CERN-PH-EP-2014-204; CERN-PH-EP-2014-204.- Geneva : CERN, 2014-11-30 - 9 p. Article from SCOAP3: PDF; Draft (restricted): PDF; Elsevier Open Access article: PDF; Fulltext: CERN-PH-EP-2014-204 - PDF; S0370269314008685 - XML; arXiv:1408.4286 - PDF;
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9.
Measurement of the Charged-Pion Polarizability / COMPASS Collaboration
The COMPASS collaboration at CERN has investigated pion Compton scattering, $\pi^-\gamma\rightarrow \pi^-\gamma$, at centre-of-mass energy below 3.5 pion masses. The process is embedded in the reaction $\pi^-\mathrm{Ni}\rightarrow\pi^-\gamma\;\mathrm{Ni}$, which is initiated by 190 GeV pions impinging on a nickel target. [...]
arXiv:1405.6377; CERN-PH-EP-2014-109; CERN-PH-EP-2014-109.- Geneva : CERN, 2015-02-10 - 6 p. - Published in : Phys. Rev. Lett. 114 (2015) 062002 APS Open Access article: PDF; Draft (restricted): PDF; Fulltext: arXiv:1405.6377 - PDF; CERN-PH-EP-2014-109 - PDF; External link: Interactions.org article
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10.
Spin alignment and violation of the OZI rule in exclusive $\omega$ and $\phi$ production in pp collisions / COMPASS collaboration
Exclusive production of the isoscalar vector mesons $\omega$ and $\phi$ is measured with a 190 GeV$/c$ proton beam impinging on a liquid hydrogen target. Cross section ratios are determined in three intervals of the Feynman variable $x_{F}$ of the fast proton. [...]
arXiv:1405.6376; CERN-PH-EP-2014-096; CERN-PH-EP-2014-096.- Geneva : CERN, 2014-09 - 24 p. - Published in : Nucl. Phys. B 886 (2014) 1078-1101 Article from SCOAP3: PDF; Draft (restricted): PDF; Elsevier Open Access article: PDF; Fulltext: CERN-PH-EP-2014-096 - PDF; S0550321314002399 - XML; arXiv:1405.6376 - PDF;
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12 Wolbeek, J. ter
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