Photoproduction of a pi rhoT pair with a large invariant mass and transversity generalized parton distribution - INSPIRE

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Photoproduction of a pi rhoT pair with a large invariant mass and transversity generalized parton distribution

M. El Beiyad
(
- Ecole Polytechnique and
- Orsay, LPT
)
,
B. Pire
(
- Ecole Polytechnique
)
,
M. Segond
(
- Leipzig U.
)
,
L. Szymanowski
(
- Ecole Polytechnique and
- Warsaw, Inst. Nucl. Studies
)
,
S. Wallon
(
- Orsay, LPT and
- Paris, LPTHE
)

Jan, 2010

17 pages

Published in:

Phys.Lett.B 688 (2010) 154-167

e-Print:

1001.4491 [hep-ph]

DOI:

10.1016/j.physletb.2010.02.086

Report number:

CPHT-RR001.0110,
LPT-10-07

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Abstract: (Elsevier)

The chiral-odd transversity generalized parton distributions (GPDs) of the nucleon can be accessed experimentally through the exclusive photoproduction process γ+N→π+ρ+N′ , in the kinematics where the meson pair has a large invariant mass and the final nucleon has a small transverse momentum, provided the vector meson is produced in a transversally polarized state. We calculate perturbatively the scattering amplitude at leading order in αs . We build a simple model for the dominant transversity GPD HT(x,ξ,t) based on the concept of double distribution. We estimate the unpolarized differential cross section for this process in the kinematics of the Jlab and Compass experiments. Counting rates show that the experiment looks feasible with the real photon beam characteristics expected at JLab@12 GeV, and with the quasi real photon beam in the Compass experiment.

Note:

17 pages, 11 figures

Transversity
Exclusive reactions
Generalized parton distributions
Quantum chromodynamics
photon: beam
photon nucleon: exclusive reaction
pi: photoproduction
higher-order: 0
rho(770): photoproduction
nucleon: generalized parton distribution

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