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CERN Document Server 22 registres trobats  1 - 10següentfinal  anar al registre: La cerca s'ha fet en 0.57 segons. 
1.
Double-spin asymmetry in exclusive $\rho^{0}$ meson production / Grajek, O A (Warsaw, Inst. Nucl. Studies)
The longitudinal double-spin asymmetry $A^{\rho}_{1}$ extracted from exclusive muoproduction of $\rho^{0}$ mesons, $\mu+N\rightarrow\mu+N'+\rho^{0}$, is studied using 2002 and 2003 data from the COMPASS experiment. [...]
2005. - 7 p.
Fulltext
2.
Spin effects in exclusive $\rho^{0}$ meson production at COMPASS experiment / Grajek, O A (Warsaw, Inst. Nucl. Studies) /on behalf of the COMPASS Collaboration
Preliminary results from exclusive production of $\rho^{0}$ mesons at the COMPASS experiment at CERN, using a 160 GeV polarized muon beam and a large polarized nuclear target, are presented. The studied reaction is exclusive $incoherent \rho^{0}$ production, $\mu N\rightarrow\mu N\rho^{0}$, with $N$ being the nucleon in any of the nuclei of the target. [...]
2005 - 14 p. - Published in : Acta Phys. Pol. B 36 (2005) 2363 Fulltext: PDF;
In : Cracow Epiphany Conference on Hadron Spectroscopy, Krakow, Poland, 6 - 8 Jan 2005, pp.2363
3.
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
4.
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
5.
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;
6.
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;
7.
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
8.
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
9.
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
10.
Double spin asymmetry in exclusive $\rho^0$ muoproduction at COMPASS / COMPASS Collaboration
The longitudinal double spin asymmetry A_1^rho for exclusive leptoproduction of rho^0 mesons, mu + N -> mu + N + rho, is studied using the COMPASS 2002 and 2003 data. The measured reaction is incoherent exclusive rho^0 production on polarised deuterons. [...]
arXiv:0704.1863; CERN-PH-EP-2007-009; CERN-PH-EP-2007-009.- 2007 - 15 p. - Published in : Eur. Phys. J. C 52 (2007) 255-265 Fulltext: PDF; External link: Preprint

CERN Document Server : 22 registres trobats   1 - 10següentfinal  anar al registre:
Vegeu també: autors amb noms similars
4 Grajek, O A
1 Grajek, O.
2 Grajek, Oleg A.
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