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26 April 2024

» arxiv » 1512.5053

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Leading-order determination of the gluon polarisation using a novel method
C. Adolph ; M. Aghasyan ; R. Akhunzyanov ; M.G. Alexeev ; G.D. Alexeev ; A. Amoroso ; V. Andrieux ; N.V. Anfimov ; V. Anosov ; W. Augustyniak ; A. Austregesilo ; C.D.R. Azevedo ; B. Badelek ; F. Balestra ; J. Barth ; R. Beck ; Y. Bedfer ; J. Bernhard ; K. Bicker ; E. R. Bielert ; R. Birsa ; J. Bisplinghoff ; M. Bodlak ; M. Boer ; P. Bordalo ; F. Bradamante ; C. Braun ; A. Bressan ; M. Buechele ; W.-C. Chang ; M. Chiosso ; I. Choi ; S.-U. Chung ; A. Cicuttin ; M.L. Crespo ; Q. Curiel ; S. Dalla Torre ; S.S. Dasgupta ; S. Dasgupta ; O.Yu. Denisov ; L. Dhara ; S.V. Donskov ; N. Doshita ; V. Duic ; W. Duennweber ; M. Dziewiecki ; A. Efremov ; P.D. Eversheim ; W. Eyrich ; M. Faessler ; A. Ferrero ; M. Finger ; M. Finger jr. ; H. Fischer ; C. Franco ; N. du Fresne von Hohenesche ; J.M. Friedrich ; V. Frolov ; E. Fuchey ; F. Gautheron ; O.P. Gavrichtchouk ; S. Gerassimov ; F. Giordano ; I. Gnesi ; M. Gorzellik ; S. Grabmueller ; A. Grasso ; M. Grosse Perdekamp ; B. Grube ; T. Grussenmeyer ; A. Guskov ; F. Haas ; D. Hahne ; D. von Harrach ; R. Hashimoto ; F.H. Heinsius ; R. Heitz ; F. Herrmann ; F. Hinterberger ; N. Horikawa ; N. d'Hose ; C.-Y. Hsieh ; S. Huber ; S. Ishimoto ; A. Ivanov ; Yu. Ivanshin ; T. Iwata ; R. Jahn ; V. Jary ; R. Joosten ; P. Joerg ; E. Kabuss ; B. Ketzer ; G.V. Khaustov ; Yu.A. Khokhlov ; Yu. Kisselev ; F. Klein ; K. Klimaszewski ; J.H. Koivuniemi ; V.N. Kolosov ; K. Kondo ; K. Koenigsmann ; I. Konorov ; V.F. Konstantinov ; A.M. Kotzinian ; O.M. Kouznetsov ; M. Kraemer ; P. Kremser ; F. Krinner ; Z.V. Kroumchtein ; Y. Kulinich ; F. Kunne ; K. Kurek ; R.P. Kurjata ; A.A. Lednev ; A. Lehmann ; M. Levillain ; S. Levorato ; J. Lichtenstadt ; R. Longo ; A. Maggiora ; A. Magnon ; N. Makins ; N. Makke ; G.K. Mallot ; C. Marchand ; B. Marianski ; A. Martin ; J. Marzec ; J. Matousek ; H. Matsuda ; T. Matsuda ; G.V. Meshcheryakov ; W. Meyer ; T. Michigami ; Yu.V. Mikhailov ; M. Mikhasenko ; Y. Miyachi ; P. Montuenga ; A. Nagaytsev ; F. Nerling ; D. Neyret ; V.I. Nikolaenko ; J. Novy ; W.-D. Nowak ; G. Nukazuka ; A.S. Nunes ; A.G. Olshevsky ; I. Orlov ; M. Ostrick ; D. Panzieri ; B. Parsamyan ; S. Paul ; J.-C. Peng ; F. Pereira ; M. Pesek ; D.V. Peshekhonov ; S. Platchkov ; J. Pochodzalla ; V.A. Polyakov ; J. Pretz ; M. Quaresma ; C. Quintans ; S. Ramos ; C. Regali ; G. Reicherz ; C. Riedl ; M. Roskot ; N.S. Rossiyskaya ; D.I. Ryabchikov ; A. Rybnikov ; A. Rychter ; R. Salac ; V.D. Samoylenko ; A. Sandacz ; C. Santos ; S. Sarkar ; I.A. Savin ; T. Sawada ; G. Sbrizzai ; P. Schiavon ; K. Schmidt ; H. Schmieden ; K. Schoenning ; S. Schopferer ; E. Seder ; A. Selyunin ; O.Yu. Shevchenko ; L. Silva ; L. Sinha ; S. Sirtl ; M. Slunecka ; J. Smolik ; F. Sozzi ; A. Srnka ; M. Stolarski ; M. Sulc ; H. Suzuki ; A. Szabelski ; T. Szameitat ; P. Sznajder ; S. Takekawa ; M. Tasevsky ; S. Tessaro ; F. Tessarotto ; F. Thibaud ; F. Tosello ; V. Tskhay ; S. Uhl ; J. Veloso ; M. Virius ; J. Vondra ; T. Weisrock ; M. Wilfert ; J. ter Wolbeek ; K. Zaremba ; P. Zavada ; M. Zavertyaev ; E. Zemlyanichkina ; M. Ziembicki ; A. Zink ;
Date:	16 Dec 2015
Abstract:	A re-evaluation of the gluon polarisation $Delta g/g$ in the nucleon is presented, which is based on the measurement of the longitudinal double-spin asymmetry using semi-inclusive events with photon virtuality $Q^2>1~({ m GeV}/c)^2$. The data were obtained by the COMPASS experiment at CERN using a 160 GeV/$c$ polarised muon beam scattering off a polarised $^6$LiD target. The gluon polarisation is evaluated for three intervals of the nucleon momentum fraction carried by gluons, $x_{ m g}$, covering the range $0.04 !<! x_{ m g}! <! 0.28$ . A novel method covering the full range in hadron transverse momentum $p_{ m T}$ and a neural network approach are used. The values obtained at leading order in pQCD do not show any significant dependence on $x_{ m g}$. Averaged over the three intervals, the result is $langle Delta g/g angle = 0.113 pm 0.038_{ m (stat.)}pm 0.036_{ m (syst.)}$ at $langle x_{ m g} angle approx 0.10$ and a hard scale of $mu^2= langle Q^2 angle = 3 ({ m GeV}/c)^2$. The obtained result suggests that the gluon polarisation is positive in the measured $x_{ m g}$ range.
Source:	arXiv, 1512.5053
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