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Angular Distributions of Drell-Yan Dimuons At Fermilab

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Bryan Ramson

on 7 December 2016

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Transcript of Angular Distributions of Drell-Yan Dimuons At Fermilab

J.S. Conway
et al.
(E615 Collaboration) Physical Review D 39 (1989) 1:92-122
C. Adolph
et al.
(Compass Collaboration) Nuclear Physics B 886 (2014) 1046-1077
Angular structure functions can be accessed without polarization in DY
Angular Distributions of Drell-Yan Dimuons at Fermilab
Prior Art
Transverse Momentum Distributions
Analysis Progress
Introduction
Bryan Ramson
University of Mic
higan, Ann Arbor

22nd International Spin Symposium
September 27, 2016
University of Illinois
,
Urbana-Champaign

(Semi-Inclusive) Deep-Inelastic Scattering
DIS Cross Section
Callan-Gross Relation
Half integer spin of quarks
Drell-Yan Process
Drell Yan Cross Section
Unpolarized Nucleon Physics as a Spin Laboratory?
(SI)DIS cross section contains "unpolarized" parts
Drell-Yan Angular Dependent Cross Section
Lam-Tung Relation
TMDs Valid When:
(SI)DIS
Drell-Yan
A. Airapetian
et al.
(Hermes Collaboration) Physical Review D 87 (2013) 012010
M. Guanziroli
et al.
(NA10 Collaboration) Zeitschrift fur Physik C 37 (1988) 545-556
E866 @ 800 GeV, 1995
Lam-Tung Violation?
L. Y. Zhu et al. (E866/NuSea Collaboration) Physical Review Letters 102 (2009) 182001
R. S. Towell
et al.
(E866/NuSea Collaboration) Physical Review D 64 (2001) 052002
Fermilab Main Injector delivers beam at 120 GeV
Fermilab E906/SeaQuest
Magnet Bend
Trigger Coincidences
R. S. Towell
et al.
(E866/NuSea Collaboration) Physical Review D 64 (2001) 052002
J. S. Conway et al. (E615 Collaboration) Physical Review D 39 (1989) 1:92-122
Significantly increased target x versus E866-Larger Boer-Mulders correlation possible?
E866 p+p, p+d
Majority of E866/NuSea Data
Majority of E906/SeaQuest Data
Stronger TMD correlation from down seaquark enhancement mechanism?
Quite an interesting time for spin in QCD!
Currently constraining SeaQuest angular backgrounds!
Lam-Tung violation likely!
Stay Tuned!!!
Fragmentation Functions
Initial State/PDFs
Final State/FFs
(SI)DIS
Drell-Yan
Compass @ 160 GeV, 2004
Hermes @ 27.6 GeV, 2000, 2005-2007
NA10, 1988
E615 @ 252 GeV, 1989
L. Y. Zhu
et al.
(E866/NuSea Collaboration) Physical Review Letters 102 (2009) 182001
E866 p+p, p+d
J. S. Conway et al. (E615 Collaboration) Physical Review D 39 (1989) 1:92-122
E615 pi + W
Difference in magnitude due to:
E615 pi + W
Difference in kinematics?
Difference in hadrons?
Difference in valence versus sea?
SeaQuest Preliminary
Full transcript