Evidences for two scales in hadrons
Citations Over TimeTop 10% of 2007 papers
Abstract
Some unusual features observed in hadronic collisions at high energies can be understood assuming that gluons in hadrons are located within small spots occupying only about 10% of the hadrons' area. Such a conjecture about the presence of two scales in hadrons helps to explain the following: why diffractive gluon radiation is so suppressed; why the triple-Pomeron coupling shows no $t$ dependence; why total hadronic cross sections rise so slowly with energy; why diffraction cones shrink so slowly, and why ${\ensuremath{\alpha}}_{\mathbb{P}}^{\ensuremath{'}}\ensuremath{\ll}{\ensuremath{\alpha}}_{\mathbb{R}}^{\ensuremath{'}}$; why the transition from hard to soft regimes in the structure functions occurs at rather large ${Q}^{2}$; why the observed Cronin effect at collider energies is so weak; why hard reactions sensitive to primordial parton motion (direct photon, Drell-Yan dileptons, heavy flavors, back-to-back dihadrons, seagull effect, etc.) demand such a large transverse momenta of the projectile partons, which is not explained by next-to-leading order calculations; why the onset of nuclear shadowing for gluons is so delayed compared to quarks; and why shadowing is so weak.