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The polarised valence quark distribution from semi-inclusive DIS

Publication ,  Journal Article
Alekseev, M; Alexakhin, VY; Alexandrov, Y; Alexeev, GD; Amoroso, A; Arbuzov, A; Badełek, B; Balestra, F; Ball, J; Barth, J; Baum, G; Bedfer, Y ...
Published in: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
March 6, 2008
Published version (DOI)

The semi-inclusive difference asymmetry Ah+ - 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 6LiD target in the kinematic range 0.006 < x < 0.7 and 1 < Q2 < 100   (GeV / c)2. In leading order QCD (LO) the deuteron asymmetry Ah+ - h- measures the valence quark polarisation and provides an evaluation of the first moment of Δ uv + Δ dv which is found to be equal to 0.40 ± 0.07 (stat.) ± 0.06 (syst.) over the measured range of x at Q2 = 10   (GeV / c)2. When combined with the first moment of g1d previously measured on the same data, this result favours a non-symmetric polarisation of light quarks Δ over(u, ̄) = - Δ over(d, ̄) at a confidence level of two standard deviations, in contrast to the often assumed symmetric scenario Δ over(u, ̄) = Δ over(d, ̄) = Δ over(s, ̄) = Δ s. © 2008 Elsevier B.V. All rights reserved.

Duke Scholars

Anselm G. Vossen
Author Anselm G. Vossen Physics

Published In

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

DOI

10.1016/j.physletb.2007.12.056

ISSN

0370-2693

Publication Date

March 6, 2008

Volume

660

Issue

5

Start / End Page

458 / 465

Related Subject Headings

  • Nuclear & Particles Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0201 Astronomical and Space Sciences
  • 0105 Mathematical Physics
 

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Alekseev, M., Alexakhin, V. Y., Alexandrov, Y., Alexeev, G. D., Amoroso, A., Arbuzov, A., … Kabuß, E. (2008). The polarised valence quark distribution from semi-inclusive DIS. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 660(5), 458–465. https://doi.org/10.1016/j.physletb.2007.12.056
Alekseev, M., V. Y. Alexakhin, Y. Alexandrov, G. D. Alexeev, A. Amoroso, A. Arbuzov, B. Badełek, et al. “The polarised valence quark distribution from semi-inclusive DIS.” Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 660, no. 5 (March 6, 2008): 458–65. https://doi.org/10.1016/j.physletb.2007.12.056.
Alekseev M, Alexakhin VY, Alexandrov Y, Alexeev GD, Amoroso A, Arbuzov A, et al. The polarised valence quark distribution from semi-inclusive DIS. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2008 Mar 6;660(5):458–65.
Alekseev, M., et al. “The polarised valence quark distribution from semi-inclusive DIS.” Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 660, no. 5, Mar. 2008, pp. 458–65. Scopus, doi:10.1016/j.physletb.2007.12.056.
Alekseev M, Alexakhin VY, Alexandrov Y, Alexeev GD, Amoroso A, Arbuzov A, Badełek B, Balestra F, Ball J, Barth J, Baum G, Bedfer Y, Bernet C, Bertini R, Bettinelli M, Birsa R, Bisplinghoff J, Bordalo P, Bradamante F, Bravar A, Bressan A, Brona G, Burtin E, Bussa MP, Chapiro A, Chiosso M, Cicuttin A, Colantoni M, Costa S, Crespo ML, Dalla Torre S, Dafni T, Das S, Dasgupta SS, De Masi R, Dedek N, Denisov OY, Dhara L, Diaz V, Dinkelbach AM, Donskov SV, Dorofeev VA, Doshita N, Duic V, Dünnweber W, Eversheim PD, Eyrich W, Faessler M, Falaleev V, Ferrero A, Ferrero L, Finger M, Fischer H, Franco C, Franz J, Friedrich JM, Frolov V, Garfagnini R, Gautheron F, Gavrichtchouk OP, Gazda R, Gerassimov S, Geyer R, Giorgi M, Gobbo B, Goertz S, Gorin AM, Grabmüller S, Grajek OA, Grasso A, Grube B, Gushterski R, Guskov A, Haas F, Hannappel J, von Harrach D, Hasegawa T, Heckmann J, Hedicke S, Heinsius FH, Hermann R, Heß C, Hinterberger F, von Hodenberg M, Horikawa N, Horikawa S, d’Hose N, Ilgner C, Ioukaev AI, Ishimoto S, Ivanov O, Ivanshin Y, Iwata T, Jahn R, Janata A, Jasinski P, Joosten R, Jouravlev NI, Kabuß E. The polarised valence quark distribution from semi-inclusive DIS. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2008 Mar 6;660(5):458–465.
Journal cover image

Published In

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

DOI

10.1016/j.physletb.2007.12.056

ISSN

0370-2693

Publication Date

March 6, 2008

Volume

660

Issue

5

Start / End Page

458 / 465

Related Subject Headings

  • Nuclear & Particles Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0201 Astronomical and Space Sciences
  • 0105 Mathematical Physics