Exclusive J/ψ photoproduction in a diffractive process using the AdS/QCD holographic wave function in BLFQ

AdS/QCD is implemented to calculate the basis light-front quantization (BLFQ) wave function for [Formula: see text] meson. Exclusive [Formula: see text] photoproduction is computed in the dipole picture using this holographic wave function. The bCGC model is employed in the calculation of [Formula: see text] production for dipole amplitude. The differential cross-sections and total cross-sections of [Formula: see text] meson are computed and compared with the experimental data. We find that the AdS/QCD holographic wave function in BLFQ can be employed as a new candidate for the light-front wave function of [Formula: see text] meson in diffractive process.

Large Rapidity Gap Method to Select Soft Diffraction Dissociation at the LHC

In proton-proton (pp) collisions, any process involves exchanging the vacuum quantum numbers is known as diffractive process. A diffractive process with no largeQ2is called soft diffractive process. The diffractive processes are important for understanding nonperturbative QCD effects and they also constitute a significant fraction of the total pp cross section. The diffractive events are typically characterized by a region of the detector without particles, known as a rapidity gap. In order to observe diffractive events in this way, we consider the pseudorapidity acceptance in the forward region of the ATLAS and CMS detectors at the Large Hadron Collider (LHC) and discuss the methods to select soft diffractive dissociation for pp collisions ats=7 TeV. It is shown that, in the limited detector rapidity acceptance, it is possible to select diffractive dissociation events by requiring a rapidity gap in the event; however, without using forward detectors, it seems not possible to fully separate single and double diffractive dissociation events. The Zero Degree Calorimeters can be used to distinguish the type of the diffractive processes up to a certain extent.

DIFFRACTION AND VECTOR MESON PRODUCTION

A review is given of the measurements of the diffractive process in recent years from two high-energy colliders, the HERA ep collider and the Tevatron [Formula: see text] collider. The energy dependence of the cross sections and the factorisation properties of diffractive processes are discussed.