Tomography of exotic hadrons in high-energy exclusive processes

作者：Kawamura H^*; Kumano S

来源：Physical Review D - Particles, Fields, Gravitation and Cosmology, 2014, 89(5): 054007.

DOI：10.1103/PhysRevD.89.054007

We investigated the possibility of determining the internal structure of exotic hadrons by using high-energy reaction processes, where quarks and gluons are appropriate degrees of freedom. In particular, it should be valuable to investigate the high-energy exclusive processes that include generalized parton distributions (GPDs) and generalized distribution amplitudes (GDAs). The GPDs and GDAs contain momentum distributions of partons and form factors. We found that the exotic nature appears in momentum distributions of quarks as suggested by the constituent- counting rule and in the form factors associated with exotic hadron sizes and the number of constituents. We also propose that these exotic signatures should be found in the exclusive production processes of exotic hadrons from gamma*gamma in electron- positron annihilation. For example, the GDAs contain information on a timelike form factor of the energy- momentum tensor of a hadron h. We show that the cross section of e gamma -> e + h (h) over bar is sensitive to the exotic signature by looking at the h (h) over bar invariant-mass dependence by taking light hadrons, h = integral(0)(980) and alpha(0)(980). From such GDA measurements, the tomography of exotic hadrons becomes possible, for example, with Belle and BABAR experiments and a future linear collider.

• 出版日期2014-3-6