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Quark helicity distributions from longitudinal spin asymmetries in muon-proton and muon-deuteron scattering

Publication ,  Journal Article
Alekseev, MG; Alexakhin, V; Alexandrov, Y; Alexeev, GD; Amoroso, A; Austregesilo, A; Balestra, F; Barth, J; Baum, G; Bedfer, Y; Bernhard, J ...
Published in: Physics Letters Section B Nuclear Elementary Particle and High Energy Physics
January 1, 2010
Published version (DOI)

Double-spin asymmetries for production of charged pions and kaons in semi-inclusive deep-inelastic muon scattering have been measured by the COMPASS experiment at CERN. The data, obtained by scattering a 160 GeV muon beam off a longitudinally polarised NH3 target, cover a range of the Bjorken variable x between 0.004 and 0.7. A leading order evaluation of the helicity distributions for the three lightest quarks and antiquark flavours derived from these asymmetries and from our previous deuteron data is presented. The resulting values of the sea quark distributions are small and do not show any sizable dependence on x in the range of the measurements. No significant difference is observed between the strange and antistrange helicity distributions, both compatible with zero. The integrated value of the flavour asymmetry of the helicity distribution of the light-quark sea, Δū-sΔd̄, is found to be slightly positive, about 1.5 standard deviations away from zero. © 2010 Elsevier B.V.

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.2010.08.034

ISSN

0370-2693

Publication Date

January 1, 2010

Volume

693

Issue

3

Start / End Page

227 / 235

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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Alekseev, M. G., Alexakhin, V., Alexandrov, Y., Alexeev, G. D., Amoroso, A., Austregesilo, A., … Konstantinov, V. F. (2010). Quark helicity distributions from longitudinal spin asymmetries in muon-proton and muon-deuteron scattering. Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, 693(3), 227–235. https://doi.org/10.1016/j.physletb.2010.08.034
Alekseev, M. G., V. Alexakhin, Y. Alexandrov, G. D. Alexeev, A. Amoroso, A. Austregesilo, F. Balestra, et al. “Quark helicity distributions from longitudinal spin asymmetries in muon-proton and muon-deuteron scattering.” Physics Letters Section B Nuclear Elementary Particle and High Energy Physics 693, no. 3 (January 1, 2010): 227–35. https://doi.org/10.1016/j.physletb.2010.08.034.
Alekseev MG, Alexakhin V, Alexandrov Y, Alexeev GD, Amoroso A, Austregesilo A, et al. Quark helicity distributions from longitudinal spin asymmetries in muon-proton and muon-deuteron scattering. Physics Letters Section B Nuclear Elementary Particle and High Energy Physics. 2010 Jan 1;693(3):227–35.
Alekseev, M. G., et al. “Quark helicity distributions from longitudinal spin asymmetries in muon-proton and muon-deuteron scattering.” Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, vol. 693, no. 3, Jan. 2010, pp. 227–35. Scopus, doi:10.1016/j.physletb.2010.08.034.
Alekseev MG, Alexakhin V, Alexandrov Y, Alexeev GD, Amoroso A, Austregesilo A, Balestra F, 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, Chaberny D, Chiosso M, Chung SU, Cicuttin A, Colantoni M, Crespo ML, Torre SD, Das S, Dasgupta SS, Denisov OY, Dhara L, Diaz V, Donskov SV, Doshita N, Duic V, Dünnweber W, Efremov A, El Alaoui A, Eversheim PD, Eyrich W, Faessler M, Ferrero A, Filin A, Finger M, Fischer H, Franco C, Friedrich JM, Garfagnini R, Gautheron F, Gavrichtchouk OP, Gazda R, Gerassimov S, Geyer R, Giorgi M, Gnesi I, Gobbo B, Goertz S, Grabmüller S, Grasso A, Grube B, Gushterski R, Guskov A, Haas F, von Harrach D, Hasegawa T, Heinsius FH, 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, Kang D, Ketzer B, Khaustov GV, Khokhlov YA, Kisselev Y, Klein F, Klimaszewski K, Koblitz S, Koivuniemi JH, Kolosov VN, Kondo K, Königsmann K, Konopka R, Konorov I, Konstantinov VF. Quark helicity distributions from longitudinal spin asymmetries in muon-proton and muon-deuteron scattering. Physics Letters Section B Nuclear Elementary Particle and High Energy Physics. 2010 Jan 1;693(3):227–235.
Journal cover image

Published In

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics

DOI

10.1016/j.physletb.2010.08.034

ISSN

0370-2693

Publication Date

January 1, 2010

Volume

693

Issue

3

Start / End Page

227 / 235

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