We present the first measurement of the gluon polarisation in the nucleon based on the photon–gluon fusion process tagged by charmed meson production and decay to charged K and . The data were collected in polarised muon scattering off a polarised deuteron target by the COMPASS collaboration at CERN during 2002– 2004. The result of this LO analysis is D g g E x = −0.47 ± 0.44(stat) ± 0.15(syst) at hxi ≈ 0.11 and a scale μ2 ≈ 13 (GeV/c)2.
Direct Measurement of the Gluon Polarisation in the Nucleon via Charmed Meson Production
M. Alekseev;AMOROSO, Antonio;BALESTRA, Ferruccio;M. P. Bussa;CHIOSSO, Michela;FERRERO, Livio;MAGGIORA, MARCO;PIRAGINO, Guido;SOSIO, Stefano;
2008-01-01
Abstract
We present the first measurement of the gluon polarisation in the nucleon based on the photon–gluon fusion process tagged by charmed meson production and decay to charged K and . The data were collected in polarised muon scattering off a polarised deuteron target by the COMPASS collaboration at CERN during 2002– 2004. The result of this LO analysis is D g g E x = −0.47 ± 0.44(stat) ± 0.15(syst) at hxi ≈ 0.11 and a scale μ2 ≈ 13 (GeV/c)2.File in questo prodotto:
File | Dimensione | Formato | |
---|---|---|---|
2008_arXiv_hep-ex_0802.3023.pdf
Accesso aperto
Tipo di file:
POSTPRINT (VERSIONE FINALE DELL’AUTORE)
Dimensione
156.03 kB
Formato
Adobe PDF
|
156.03 kB | Adobe PDF | Visualizza/Apri |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.