Timelike virtual compton scattering from electron-positron radiative annihilation
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Title |
Timelike virtual compton scattering from electron-positron radiative annihilation
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Creator |
AFANASEV, A
BRODSKY, SJ CARLSON, CE MUKHERJEE, A |
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Subject |
generalized parton distributions
wave-function model representation hadrons charge quark tests |
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Description |
We propose measurements of the deeply virtual Compton amplitude (DVCS) gamma* -> h (h) over bar gamma in the timelike t = (p(h) + p((h) over bar))(2) > 0 kinematic domain which is accessible at electron-positron colliders via the radiative annihilation process e(+)e(-) -> h (h) over bar gamma. These processes allow the measurement of timelike deeply virtual Compton scattering for a variety of h (h) over bar hadron pairs such as pi(+),pi(-), K(+)K(-), and D (D) over bar as well as p (p) over bar. As in the conventional spacelike DVCS, there are interfering coherent amplitudes contributing to the timelike processes involving C = - form factors. The interference between the amplitudes measures the phase of the C = + timelike DVCS amplitude relative to the phase of the timelike form factors and can be isolated by considering the forward-backward e(+) e(-) asymmetry. The J = 0 fixed pole contribution which arises from the local coupling of the two photons to the quark current plays a special role. As an example we present a simple model.
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Publisher |
AMER PHYSICAL SOC
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Date |
2011-07-17T00:40:19Z
2011-12-26T12:50:02Z 2011-12-27T05:35:57Z 2011-07-17T00:40:19Z 2011-12-26T12:50:02Z 2011-12-27T05:35:57Z 2010 |
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Type |
Article
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Identifier |
PHYSICAL REVIEW D, 81(3), -
1550-7998 http://dx.doi.org/10.1103/PhysRevD.81.034014 http://dspace.library.iitb.ac.in/xmlui/handle/10054/4573 http://hdl.handle.net/10054/4573 |
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Language |
en
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