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CERN Document Server Znaleziono 10 rekordów  Szukanie trwało 1.23 sekund. 
1.
Observation of a $J^{PC} = 1^{-+}$ exotic resonance in diffractive dissociation of 190 GeV/c $\pi^{-}$ into $\pi^- \pi^- \pi^+$ / COMPASS collaboration
The COMPASS experiment at the CERN SPS has studied the diffractive dissociation of negative pions into the pi- pi- pi+ final state using a 190 GeV/c pion beam hitting a lead target. A partial wave analysis has been performed on a sample of 420000 events taken at values of the squared 4-momentum transfer t' between 0.1 and 1 GeV^2/c^2. [...]
arXiv:0910.5842; CERN-PH-EP-2009-018; CERN-PH-EP-2009-018.- 2010 - 10 p. - Published in : Phys. Rev. Lett. 104 (2010) 241803 APS Published version, local copy: PDF; Fulltext: cern-ph-ep_2009-018 - PDF; arXiv:0910.5842 - PDF; External link: Preprint
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2.
Measurement of the Longitudinal Spin Transfer to Lambda and Anti-Lambda Hyperons in Polarised Muon DIS / COMPASS collaboration
The longitudinal polarisation transfer from muons to lambda and anti-lambda hyperons, D_LL, has been studied in deep inelastic scattering off an unpolarised isoscalar target at the COMPASS experiment at CERN. The spin transfers to lambda and anti-lambda produced in the current fragmentation region exhibit different behaviours as a function of x and xF . [...]
arXiv:0907.0388; CERN-PH-EP-2009-011; CERN-PH-EP-2009-011.- Geneva : CERN, 2009 - 13 p. - Published in : Eur. Phys. J. C 64 (2009) 171-179 Fulltext: arXiv:0907.0388 - PDF; 10052_2009_1143_OnlinePDF - PDF; Springer Open Access article: PDF; External link: DURHAM
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3.
Flavour Separation of Helicity Distributions from Deep Inelastic Muon-Deuteron Scattering / COMPASS Collaboration
We present a LO evaluation of helicity densities of valence, \Delta u_v+\Delta d_v, non-strange sea, \Delta\bar{u}+\Delta\bar{d}, and strange quarks, \Delta s (assumed to be equal to \Delta\bar{s}). They have been obtained from the inclusive asymmetry A_{3,d} and the semi-inclusive asymmetries A^{\pi+}_{1,d}, A^{\pi-}_{1,d}, A^{K+}_{1,d}, A^{K-}_{1,d} measured in polarised deep inelastic muon-deuteron scattering. [...]
arXiv:0905.2828; CERN-PH-EP-2009-008; CERN-PH-EP-2009-008.- Geneva : CERN, 2009 - 15 p. - Published in : Phys. Lett. B 680 (2009) 217-224 Fulltext: arXiv:0905.2828 - PDF; S0370269309010351 - XML;
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4.
Gluon Polarisation in the Nucleon and Longitudinal Double Spin Asymmetries from Open Charm Muoproduction / COMPASS collaboration
The gluon polarisation in the nucleon has been determined by detecting charm production via D0 meson decay to charged K and pi in polarised muon scattering off a longitudinally polarised deuteron target. The data were taken by the COMPASS Collaboration at CERN between 2002 and 2006 and corresponds to an integrated luminosity of 2.8 fb^-1. [...]
arXiv:0904.3209.- 2009 - 16 p. - Published in : Phys. Lett. B 676 (2009) 31-38 Fulltext: S0370269309004742 - XML; arXiv:0904.3209 - PDF;
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5.
Direct Measurement of the Gluon Polarisation in the Nucleon via Charmed Meson Production / COMPASS Collaboration
We present the first measurement of the gluon polarisation in the nucleon based on the photon-gluon fusion process tagged by charmed meson production and decay to charged K and pi. [...]
arXiv:0802.3023 ; IRFU-08-14 ; CERN-PH-EP-2008-003 ; CERN-PH-EP-2008-003. - 2008. - 10 p.
Preprint - Full text - Fulltext
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6.
Collins and Sivers Transverse Spin Asymmetries for Pions and Kaons on Deuterons / COMPASS Collaboration
The measurements of the Collins and Sivers asymmetries of identified hadrons produced in deep-inelastic scattering of 160 GeV/c muons on a transversely polarised 6LiD target at COMPASS are presented. The results for charged pions and charged and neutral kaons correspond to all data available, which were collected from 2002 to 2004. [...]
arXiv:0802.2160; IRFU-08-15; CERN-PH-EP-2008-002; CERN-PH-EP-2008-002.- Geneva : CERN, 2009 - 14 p. - Published in : Phys. Lett. B 673 (2009) 127-135 Fulltext: PDF; External link: Preprint
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7.
The Polarised Valence Quark Distribution from semi-inclusive DIS / COMPASS Collaboration
The semi-inclusive difference asymmetry A^{h+ - h-} for hadrons of opposite charge has been measured by the COMPASS experiment at CERN. The data were collected in the years 2002-2004 using a 160 GeV polarised muon beam scattered off a large polarised 6-LiD target and cover the range 0.006 < x < 0.7 and 1 < Q^2 < 100 (GeV/c)^2. [...]
arXiv:0707.4077; CERN-PH-EP-2007-024; CERN-PH-EP-2007-024.- Geneva : CERN, 2008 - 10 p. - Published in : Phys. Lett. B 660 (2008) 458-465 Fulltext: arXiv:0707.4077 - PDF; phep-2007-024 - PDF; External link: Preprint
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8.
The COMPASS Experiment at CERN / COMPASS Collaboration
The COMPASS experiment makes use of the CERN SPS high-intensitymuon and hadron beams for the investigation of the nucleon spin structure and the spectroscopy of hadrons. One or more outgoing particles are detected in coincidence with the incoming muon or hadron. [...]
hep-ex/0703049; CERN-PH-EP-2007-001; CERN-PH-EP-2007-001.- Geneva : CERN, 2007 - 84 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 577 (2007) 455-518 Fulltext: arXiv:hep-ex_0703049 - PDF; phep-2007-001 - PDF; External link: Preprint
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9.
A new measurement of the Collins and Sivers asymmetries on a transversely polarised deuteron target / COMPASS Collaboration
New high precision measurements of the Collins and Sivers asymmetries of charged hadrons produced in deep-inelastic scattering of muons on a transversely polarised 6LiD target are presented. The data were taken in 2003 and 2004 with the COMPASS spectrometer using the muon beam of the CERN SPS at 160 GeV/c [...]
hep-ex/0610068; DAPNIA-06-341; CERN-PH-EP-2006-031; CERN-PH-EP_2006-031; CERN-PH-EP-2006-031.- Geneva : CERN, 2007 - 40 p. - Published in : Nucl. Phys. B 765 (2007) 31-70 Fulltext: phep-2006-031 - PDF; arXiv:hep-ex_0610068 - PDF; External link: Preprint
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10.
The Deuteron Spin-dependent Structure Function $g^{d}_1$ and its First Moment / COMPASS Collaboration
We present a measurement of the deuteron spin-dependent structure function g^d_1 based on the data collected by the COMPASS experiment at CERN during the years 2002-2004. The data provide an accurate evaluation for \Gamma^d_1, the first moment of g^d_1(x), and for the matrix element of the singlet axial current, a_0. [...]
hep-ex/0609038; DAPNIA-06-234; CERN-PH-EP-2006-029; CERN-PH-EP-2006-029.- Geneva : CERN, 2007 - 16 p. - Published in : Phys. Lett. B 647 (2007) 8-17 Fulltext: phep-2006-029 - PDF; 0609038 - PDF; arXiv:hep-ex_0609038 - PDF; External link: Preprint
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