Transverse spin effects at COMPASS

Journal Article · Mon Mar 23 04:00:00 EDT 2009 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3122235· OSTI ID:21293498

Pesaro, G ^[1]

---

1. Trieste University and INFN, via Valerio 2, 34148 Trieste (Italy)

The COMPASS experiment at the CERN SPS has a broad physics program focused on the nucleon spin structure and on hadron spectroscopy, using both muon and hadron beams. One of the main objectives for the spin program with the muon beam is the measurement of transverse spin effects in semi inclusive deep inelastic scattering. A longitudinally polarized 160 GeV/c muon beam is impinging on a transversely polarized target: from 2002 to 2004 a {sup 6}LiD(deuteron) target has been used, while during 2007 data taking a NH{sub 3}(proton) target was put in place. All measured transverse asymmetries on deuteron have been found to be small, and compatible with zero, within the few percent statistical errors. These results, which are currently used as input for global fits, can be interpreted as cancellation between u and d quark contribution in the deuteron. The first results for the Collins and Sivers asymmetries for charged hadrons from the 2007 proton COMPASS data are also presented and discussed.

• OSTI ID: 21293498
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1105; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
BARYON SPECTROSCOPY
CERN SPS SYNCHROTRON
COMPTON EFFECT
D QUARKS
DEEP INELASTIC SCATTERING
DEUTERIUM TARGET
GEV RANGE
HYDROGEN 1 TARGET
MESON SPECTROSCOPY
MUONS
POLARIZATION
POLARIZED TARGETS
PROTONS
SPIN
U QUARKS