CERN Accelerating science

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1.
Probing transversity by measuring $\Lambda$ polarisation in SIDIS / Alexeev, M.G. ; Alexeev, G.D. (Dubna, JINR) ; Amoroso, A. ; Andrieux, V. ; Anosov, V. (Dubna, JINR) ; Augsten, K. ; Augustyniak, W. (NCBJ, Warsaw) ; Azevedo, C.D.R. (Aveiro U.) ; Badełek, B. (Warsaw U.) ; Balestra, F. et al. /COMPASS
Based on the observation of sizeable target-transverse-spin asymmetries in single-hadron and hadron-pair production in Semi-Inclusive measurements of Deep Inelastic Scattering (SIDIS), the chiral-odd transversity quark distribution functions $h_1^q$ are nowadays well established. Several possible channels to access these functions were originally proposed. [...]
arXiv:2104.13585; CERN-EP-2021-072.- Geneva : CERN, 2022-01-10 - 18 p. Draft (restricted): PDF; Fulltext: CERN-EP-2021-072 - PDF; 2104.13585 - PDF;
2.
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
3.
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
4.
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;
5.
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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