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19 April 2024

» pubmed » pmid17930942

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Measurement of angular distributions of Drell-Yan dimuons in p+d interactions at 800 GeV/c
L Y Zhu ; J C Peng ; P E Reimer ; T C Awes ; M L Brooks ; C N Brown ; J D Bush ; T A Carey ; T H Chang ; W E Cooper ; C A Gagliardi ; G T Garvey ; D F Geesaman ; E A Hawker ; X C He ; L D Isenhower ; D M Kaplan ; S B Kaufman ; S A Klinksiek ; D D Koetke ; D M Lee ; W M Lee ; M J Leitch ; N Makins ; P L McGaughey ; J M Moss ; B A Mueller ; P M Nord ; V Papavassiliou ; B K Park ; G Petitt ; M E Sadler ; W E Sondheim ; P W Stankus ; T N Thompson ; R S Towell ; R E Tribble ; M A Vasiliev ; J C Webb ; J L Willis ; D K Wise ; G R Young ; ;
Date:	24 Aug 2007
Journal:	Phys Rev Lett, 99 (8), 082301
Abstract:	We report a measurement of the angular distributions of Drell-Yan dimuons produced using an 800 GeV/c proton beam on a deuterium target. The muon angular distributions in the dilepton rest frame have been measured over the kinematic range 4.5<m{mu mu}<15 GeV/c{2}, 0<p{T}<4 GeV/c, and 0<x{F}<0.8. No significant cos2phi dependence is found in these proton-induced Drell-Yan data, in contrast with the situation for pion-induced Drell-Yan data. The data are compared with expectations from models which attribute the cos2phi distribution to a QCD vacuum effect or to the presence of the transverse-momentum-dependent Boer-Mulders structure function h{1}{perpendicular}. Constraints on the magnitude of the sea-quark h{1}{perpendicular} structure functions are obtained.
Source:	PubMed, pmid17930942
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