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Flavour separation of helicity distributions from deep inelastic muon-deuteron scattering

Publication ,  Journal Article
Alekseev, M; Alexakhin, VY; Alexandrov, Y; Alexeev, GD; Amoroso, A; Austregesilo, A; Badełek, B; Balestra, F; Ball, J; Barth, J; Baum, G ...
Published in: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
September 28, 2009
Published version (DOI)

We present a LO evaluation of helicity densities of valence, Δ u v + Δ d v, non-strange sea, Δ over(u, ̄) + Δ over(d, ̄), and strange quarks, Δs (assumed to be equal to Δ over(s, ̄)). They have been obtained from the inclusive asymmetry A 1, d and the semi-inclusive asymmetries A 1, dπ +, A 1, dπ -, A 1, dK +, A 1, dK - measured in polarised deep inelastic muon-deuteron scattering. The full deuteron statistics of COMPASS (years 2002-2004 and 2006) has been used. The data cover the range Q 2 > 1   (GeV / c) 2 and 0.004 < x < 0.3. Both non-strange densities are found to be in a good agreement with previous measurements. The distribution of Δ s (x) is compatible with zero in the whole measured range, in contrast to the shape of the strange quark helicity distribution obtained in most LO and NLO QCD fits. The sensitivity of the values of Δ s (x) upon the choice of fragmentation functions used in the derivation is discussed. © 2009 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.2009.08.065

ISSN

0370-2693

Publication Date

September 28, 2009

Volume

680

Issue

3

Start / End Page

217 / 224

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
 

Citation

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ICMJE
MLA
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Alekseev, M., Alexakhin, V. Y., Alexandrov, Y., Alexeev, G. D., Amoroso, A., Austregesilo, A., … Klimaszewski, K. (2009). Flavour separation of helicity distributions from deep inelastic muon-deuteron scattering. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 680(3), 217–224. https://doi.org/10.1016/j.physletb.2009.08.065
Alekseev, M., V. Y. Alexakhin, Y. Alexandrov, G. D. Alexeev, A. Amoroso, A. Austregesilo, B. Badełek, et al. “Flavour separation of helicity distributions from deep inelastic muon-deuteron scattering.” Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 680, no. 3 (September 28, 2009): 217–24. https://doi.org/10.1016/j.physletb.2009.08.065.
Alekseev M, Alexakhin VY, Alexandrov Y, Alexeev GD, Amoroso A, Austregesilo A, et al. Flavour separation of helicity distributions from deep inelastic muon-deuteron scattering. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2009 Sep 28;680(3):217–24.
Alekseev, M., et al. “Flavour separation of helicity distributions from deep inelastic muon-deuteron scattering.” Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 680, no. 3, Sept. 2009, pp. 217–24. Scopus, doi:10.1016/j.physletb.2009.08.065.
Alekseev M, Alexakhin VY, Alexandrov Y, Alexeev GD, Amoroso A, Austregesilo A, Badełek B, Balestra F, Ball J, Barth J, Baum G, Bedfer Y, Bernhard J, 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, Chung SU, Cicuttin A, Colantoni M, Crespo ML, Torre SD, Dafni T, Das S, Dasgupta SS, Denisov OY, Dhara L, Diaz V, Dinkelbach AM, Donskov SV, Doshita N, Duic V, Dünnweber W, Efremov A, El Alaoui A, Eversheim PD, Eyrich W, Faessler M, Ferrero A, Finger M, Fischer H, Franco C, Friedrich JM, Garfagnini R, Gautheron F, Gavrichtchouk OP, Gazda R, Gerassimov S, Geyer R, Giorgi M, Gobbo B, Goertz S, Grabmüller S, Grajek OA, Grasso A, Grube B, Gushterski R, Guskov A, Haas F, Hagemann R, von Harrach D, Hasegawa T, Heckmann J, Heinsius FH, Hermann R, Herrmann F, Heß C, Hinterberger F, Horikawa N, Höppner C, d’Hose N, Ilgner C, Ishimoto S, Ivanov O, Ivanshin Y, Iwata T, Jahn R, Jasinski P, Jegou G, Joosten R, Kabuß E, Käfer W, Kang D, Ketzer B, Khaustov GV, Khokhlov YA, Kiefer J, Kisselev Y, Klein F, Klimaszewski K. Flavour separation of helicity distributions from deep inelastic muon-deuteron scattering. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2009 Sep 28;680(3):217–224.
Journal cover image

Published In

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

DOI

10.1016/j.physletb.2009.08.065

ISSN

0370-2693

Publication Date

September 28, 2009

Volume

680

Issue

3

Start / End Page

217 / 224

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