Diffractive Heavy Quarkonia Pruduction
| Date/Time: | Wednesday, 27 Apr 2016 from 3:10 pm to 4:00 pm |
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| Location: | A401 Zaffarano Hall |
| Phone: | 515-294-8894 |
| Channel: | College of Liberal Arts and Sciences |
| Actions: | Download iCal/vCal | Email Reminder |
We study exclusive heavy flavor vector meson diffractive production in nuclear collisions within the dipole picture. Such processes exist in electron-proton, ultra-peripheral heavy ion and electron-ion collisions. Our calculations are based on the recently obtained heavy quarkonium light-front wavefunction through the basis light-front quantization (BLFQ) approach, including the one-gluon exchange interaction and a confining potential inspired by light-front holography. The $J/Psi$ cross sections measured at HERA as a function of $Q^2$, $W$ and $t$ are well described. The cross-section ratio $sigma_{Psi(2S)}/sigma_{J/Psi(1S)}$ as a function of $Q^2$, $W$ and $t$ shows agreement with recently published data. We also make predictions for the cross-section ratio of $sigma_{Psi(3S,1D)}/sigma_{J/Psi(1S)}$. Preliminary results for $J/Psi$ production in ultra-peripheral heavy ion collisions will be discussed. We conclude that measurement of diffractive heavy quarkonium production, especially the excited states, imposes rigorous constraints on heavy quarkonium light-front wavefunctions, which will then help us develop a more precise description of the gluon distribution function at small-$x$ regime.