Exclusive Neutral Pion Production at JLab Hall A

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Presentation transcript:

Exclusive Neutral Pion Production at JLab Hall A INT Workshop on Orbital Angular Momentum 6-17 February 2012 Seattle, WA Exclusive Neutral Pion Production at JLab Hall A Charles Earl Hyde Old Dominion University Norfolk VA E. Fuchey et al, Phys Rev C83:025201,2011 arXiv:1003.2938v3

Why Measure p0 Production? p0 production is an important background to DVCS via asymmetric p(e,e’g)gp decays, with the unobserved photon at low energies in backwards direction. Co-linear factorization predictiions: dsL/dsT ~ Q2 Amplitude ~ Axial Generalized Parton Distributions ˜H and ˜E

H(e,e’gg)p in Hall A 5.75 GeV beam incident on 15 cm Liquid H2 target L = 1037 /cm2/s Electron in HRS defines q-direction to ~ 1mr 70 msr PbF2 calorimeter centered on q Two photon clusters

Exclusivity in H(e,e’gg)X Reaction Exclusive H(e,e’gg)p peak Yield is stable with respect to efficiency corrections of 1 GeV threshold in Calorimeter

Electroproduction Polarized Electron beam Full azimuthal decomposition, no dsL, dsT separation.

Kinematics k = 5.75 GeV Label Q2 (GeV2) xBj W2 Kin2 2.3 0.36 Kin3 1.9

Cross Sections, Kin3 (Fitted with full Monte-Carlo)

Helicity Dependent Cross Sections, Kin3 (Fitted with full Monte-Carlo)

f-Averaged cross section ~Q–5 slower than Q–8 GPD model prediction is 10x too small. Not leading twist Probably mostly sT

Separated Cross Sections Bands are fits: sinqp sin2qp

Regge inspired model of J.-M. Laget Magnitude ~OK sTT too small Wrong sign to sTL

Hall C p+ data T. Horn et al, Phys. Rev. Lett. 97, 192001 (2006). Model of M.Kaskulov, U. Mosel PRC81 045202 for sT

Future p0 L/T Separations at JLab E07-007 Data in Hall A, 2010 4.4 and 5.5 GeV Hall C 12 GeV C12-11-102 (T.Horn et al) Please approve our NSF-MRI

Backup Slides

Resolution and t-binning Kin3 Resolution allows fine t-binning