Final COMPASS results on the deuteron spin-dependent structure function g(1)(d) and the Bjorken sum rule

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081731%3A_____%2F17%3A00480137" target="_blank" >RIV/68081731:_____/17:00480137 - isvavai.cz</a>

Alternative codes found

RIV/68407700:21340/17:00311305 RIV/46747885:24510/17:00005267 RIV/00216208:11320/17:10369345

Result on the web

<a href="http://dx.doi.org/10.1016/j.physletb.2017.03.018" target="_blank" >http://dx.doi.org/10.1016/j.physletb.2017.03.018</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.physletb.2017.03.018" target="_blank" >10.1016/j.physletb.2017.03.018</a>

Result language

angličtina

Original language name

Final COMPASS results on the deuteron spin-dependent structure function g(1)(d) and the Bjorken sum rule

Original language description

Final results are presented from the inclusive measurement of deep-inelastic polarised-muon scattering on longitudinally polarised deuterons using a (LiD)-Li-6 target. The data were taken at 160 GeV beam energy and the results are shown for the kinematic range 1 (GeV/c)(2) < Q(2) < 100 (GeV/c)(2) in photon virtuality, 0.004 < x < 0.7 in the Bjorken scaling variable and W > 4GeV/c(2) in the mass of the hadronic final state. The deuteron double-spin asymmetry A(1)(d) and the deuteron longitudinal-spin structure function g(1)(d) are presented in bins of x and Q(2). Towards lowest accessible values of x, g(1)(d) decreases and becomes consistent with zero within uncertainties. The presented final g(1)(p) values together with the recently published final g(1)(p) values of COMPASS are used to again evaluate the Bjorken sum rule and perform the QCD fit to the g(1) world data at next-to-leading order of the strong coupling constant. In both cases, changes in central values of the resulting numbers are well within statistical uncertainties. The flavour singlet axial charge a(0), which is identified in the MS renormalisation scheme with the total contribution of quark helicities to the nucleon spin, is extracted at next-to-leading order accuracy from only the COMPASS deuteron data: a(0)(Q(2) = 3 (GeV/c)(2)) = 0.32 +/- 0.02(stat) +/- 0.04(syst) +/- 0.05(evol). Together with the recent results on the proton spin structure function g(1)(p), the results on g(1)(d) constitute the COMPASS legacy on the measurements of g(1) through inclusive spin-dependent deep inelastic scattering.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10304 - Nuclear physics

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Physics Letters. B

ISSN

0370-2693

e-ISSN

—

Volume of the periodical

769

Issue of the periodical within the volume

JUNE

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

8

Pages from-to

34-41

UT code for WoS article

000402342500006

EID of the result in the Scopus database

2-s2.0-85015717874