Speaker
Description
We study the inelastic charmonium and bottomonium photoproduction and fragmentation processes in p-p and Pb-Pb collisions at LHC energies, where the ultra-incoherent photon emission is included. Using the NRQCD factorization approach, an exact treatment is developed. This approach recovers the Weizsäcker-Williams approximation (WWA) near the region, where the Martin-Ryskin and BCCKL methods are used to avoid double counting. We calculated the Q^2, y, z, sqrt s, and p_T dependent and total cross sections. Inelastic photoproduction and fragmentation were observed to contribute to heavy quarkonium production, particularly at large p_T. In addition, the contribution of the ultra-incoherent photon channel, which increases rapidly with quarkonium mass, is significant and begins to dominate the photoproduction processes for large p_T. We also obtained the complete WWA validity scopes of inelastic heavy quarkonium photoproduction in heavy-ion collisions. The WWA had high accuracy at high energies and for Pb-Pb collisions. However, current photon spectra are derived beyond the WWA scope, and double counting can occur when considering different channels simultaneously.
| 请选择分会 | 高能重离子物理 |
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