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CERN Document Server Sök i 294 journaler efter:  1 - 10nästaslut  gå till journal: Sökningen tog 0.76 sekunder. 
1.
Leading and Next-to-Leading Order Gluon Polarization in the Nucleon and Longitudinal Double Spin Asymmetries from Open Charm Muoproduction / COMPASS collaboration
The gluon polarisation in the nucleon was measured using open charm production by scattering 160 GeV/c polarised muons off longitudinally polarised protons or deuterons. The data were taken by the COMPASS collaboration between 2002 and 2007. [...]
arXiv:1211.6849; CERN-PH-EP-2012-350; CERN-PH-EP-2012-350.- Geneva : CERN, 2013-03-25 - 22 p. - Published in : Phys. Rev. D 87 (2013) 052018 APS published version, local copy: PDF; Draft (restricted): PDF; Fulltext: CERN-PH-EP-2012-350 - PDF; arXiv:1211.6849 - PDF; External link: Preprint
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2.
D* and D Meson Production in Muon Nucleon Interactions at 160 GeV/c / COMPASS Collaboration
The production of D* and D mesons in inelastic scattering of 160 GeV/c muons off a $^6$LiD target has been investigated with the COMPASS spectrometer at CERN for 0.003 (GeV/c)$^2 < Q^2 < 10$ (GeV/c)$^2$ and 3x10$^-5< x_{Bj}$ < 0.1. The study is based on 8100 events where a $D^0$ or anti $D^0$ is detected subsequently to a $D^{*+}$ or $D^{*-}$ decay, and on 34000 events, where only a $D^0$ or anti $D^0$ is detected. [...]
arXiv:1211.1575; CERN-PH-EP-2012-339; CERN-PH-EP-2012-339.- Geneva : CERN, 2012-12-11 - 22 p. - Published in : Eur. Phys. J. C 72 (2012) 2253 Draft (restricted): PDF; Fulltext: arXiv:1211.1575 - PDF; CERN-PH-EP-2012-339 - PDF; Springer Open Access article: PDF; External link: Preprint
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3.
Exclusive $\rho^0$ muoproduction on transversely polarised protons and deuterons / COMPASS Collaboration
The transverse target spin azimuthal asymmetry A_UT in hard exclusive production of rho^0 mesons was measured at COMPASS by scattering 160 GeV/c muons off transversely polarised protons and deuterons. The measured asymmetry is sensitive to the nucleon helicity-flip generalised parton distributions E^q, which are related to the orbital angular momentum of quarks in the nucleon. [...]
arXiv:1207.4301; CERN-PH-EP-2012-208; CERN-PH-EP-2012-208.- Geneva : CERN, 2012-12-01 - 20 p. - Published in : Nucl. Phys. B 865 (2012) 1 Draft (restricted): PDF; Fulltext: arXiv:1207.4301 - PDF; CERN-PH-EP-2012-208 - PDF; External link: Preprint
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4.
Measurement of the Cross Section for High-$p_T$ Hadron Production in Scattering of 160 GeV/c Muons off Nucleons / COMPASS Collaboration
The cross section for production of charged hadrons with high transverse momenta in scattering of 160 GeV/c muons off nucleons at low photon virtualities has been measured at the COMPASS experiment at CERN. The results, which cover transverse momenta from 1.1 to 3.6 GeV/c, are compared to a next-to-leading order perturbative Quantum Chromodynamics (NLO pQCD) calculation in order to evaluate the applicability of pQCD to this process in the kinematic domain of the experiment. [...]
arXiv:1207.2022; CERN-PH-EP-2012-189; CERN-PH-EP-2012-189.- Geneva : CERN, 2013-11-04 - 8 p. - Published in : Phys. Rev. D 88 (2013) 091101 APS published version, local copy: PDF; Draft (restricted): PDF; Fulltext: arXiv:1207.2022 - PDF; CERN-PH-EP-2012-189 - PDF; External link: Preprint
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5.
Experimental investigation of transverse spin asymmetries in muon-p SIDIS processes: Sivers asymmetries / COMPASS Collaboration
The COMPASS Collaboration at CERN has measured the transverse spin azimuthal asymmetry of charged hadrons produced in semi-inclusive deep inelastic scattering using a 160 GeV positive muon beam and a transversely polarised NH_3 target. The Sivers asymmetry of the proton has been extracted in the Bjorken x range 0.003<x<0.7. [...]
arXiv:1205.5122; CERN-PH-EP-2012-147; CERN-PH-EP-2012-147.- Geneva : CERN, 2012-10-31 - 7 p. - Published in : Phys. Lett. B 717 (2012) 383 Draft (restricted): PDF; Fulltext: S0370269312010039 - XML; arXiv:1205.5122 - PDF; CERN-PH-EP-2012-147 - PDF;
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6.
Experimental investigation of transverse spin asymmetries in muon-p SIDIS processes: Collins asymmetries / COMPASS Collaboration
The COMPASS Collaboration at CERN has measured the transverse spin azimuthal asymmetry of charged hadrons produced in semi-inclusive deep inelastic scattering using a 160 GeV positive muon beam and a transversely polarised NH_3 target. The Collins asymmetry of the proton was extracted in the Bjorken x range 0.003<x<0.7. [...]
arXiv:1205.5121; CERN-PH-EP-2012-146; CERN-PH-EP-2012-146.- Geneva : CERN, 2012-10-31 - 11 p. - Published in : Phys. Lett. B 717 (2012) 376 Draft (restricted): PDF; Fulltext: arXiv:1205.5121 - PDF; CERN-PH-EP-2012-146 - PDF; External link: DURHAM
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7.
Transverse spin effects in hadron-pair production from semi-inclusive deep inelastic scattering / COMPASS collaboration
First measurements of azimuthal asymmetries in hadron-pair production in deep-inelastic scattering of muons on transversely polarised ^6LiD (deuteron) and NH_3 (proton) targets are presented. The data were taken in the years 2002-2004 and 2007 with the COMPASS spectrometer using a muon beam of 160 GeV/c at the CERN SPS. [...]
arXiv:1202.6150; CERN-PH-EP-2012-053; CERN-PH-EP-2012-053.- Geneva : CERN, 2012-06-18 - 13 p. - Published in : Phys. Lett. B 713 (2012) 10-16 Draft (restricted): PDF; Fulltext: arXiv:1202.6150 - PDF; S0370269312005321 - XML; CERN-PH-EP-2012-053 - PDF;
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8.
Leading order determination of the gluon polarisation from DIS events with high-$p_T$ hadron pairs / COMPASS Collaboration
We present a determination of the gluon polarisation Delta g/g in the nucleon, based on the longitudinal double-spin asymmetry of DIS events with a pair of large transverse-momentum hadrons in the final state. The data were obtained by the COMPASS experiment at CERN using a 160 GeV/c polarised muon beam scattering off a polarised ^6LiD target. [...]
arXiv:1202.4064; CERN-PH-EP-2012-010; CERN-PH-EP-2012-010.- Geneva : CERN, 2013-01-08 - 13 p. - Published in : Phys. Lett. B 718 (2013) 922-930 Draft (restricted): PDF; Fulltext: CERN-PH-EP-2012-010 - PDF; arXiv:1202.4064 - PDF; External link: Preprint
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9.
First Measurement of Chiral Dynamics in $\pi^-\gamma \to \pi^-\pi^-\pi^+$ / COMPASS Collaboration
The COMPASS collaboration at CERN has investigated the $\pi^-\gamma \to \pi^-\pi^-\pi^+$ reaction at center-of-momentum energy below five pion masses, $\sqrt{s} \lt 5m_\pi$ , embedded in the Primakoff reaction of 190 GeV pions impinging on a lead target. Exchange of quasi-real photons is selected by isolating the sharp Coulomb peak observed at smallest momentum transfers, $t' \lt 0.001 GeV^2/c^2$. [...]
arXiv:1111.5954; CERN-PH-EP-2011-176; CERN-PH-EP-2011-176.- Geneva : CERN, 2012-11-05 - 10 p. - Published in : Phys. Rev. Lett. 108 (2012) 192001 APS Published version, local copy: PDF; Draft (restricted): PDF; Fulltext: arXiv:1111.5954 - PDF; CERN-PH-EP-2011-176 - PDF; External link: Preprint
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10.
Quark helicity distributions from longitudinal spin asymmetries in muon-proton and muon-deuteron scattering / COMPASS Collaboration
Double-spin asymmetries for production of charged pions and kaons in semi-inclusive deep-inelastic muon scattering have been measured by the COMPASS experiment at CERN. The data, obtained by scattering a 160 GeV muon beam off a longitudinally polarised NH_3 target, cover a range of the Bjorken variable x between 0.004 and 0.7. [...]
arXiv:1007.4061; CERN-PH-EP-2010-023; CERN-PH-EP-2010-023.- Geneva : CERN, 2010 - 13 p. - Published in : Phys. Lett. B 693 (2010) 227-235 Fulltext: arXiv:1007.4061 - PDF; CERN-PH-EP-2010-023 - PDF; External link: Preprint
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