Jianxiong Wang, male, born in 1963, Ph. D. in 1991 from Institute of Theoretical Physics, Chinese Academy of Science. Post-doc at the KEK (Japan) as JSPS post-doc (1992-1993) and IHEP (1994-1995). Visiting Scholar at University of Kentucky (2001- 2002). Areas of Research: Automatic calculation on Quantum Field Theory，Perturbative QCD, Effective field theories, J/psi, Upsilon production and decay。 Achievement and Experience:
In our theory group, Jianxiong Wong’s research group have devoted to developing an automatic Feynman diagram calculation system (FDC) since 1994, and with FDC they can do tree and one-loop QCD calculation completely automatic now. They successfully apply it in the long-time expected and very hard QCD corrections to J/psi production and polarization at the Tevatron and LHC. A special version of FDC has also been developed for partial wave analysis study and it has been applied for many experimental analyzes by BES experimental group.
In 1992, the transverse momentum distribution of J/psi production was measured at the Tevatron and the experimental results were found about a few ten times larger than the theory prediction. Thereafter the development of NRQCD successfully explain the experimental results, but the predicted transverse momentum distribution of transverse polarized J/psi production was found to be conflicted with the later experimental measurements of slight longitudinal polarization J/psi. In 2007, an Italian group finished QCD correction to transverse momentum distribution of J/psi hadroproduction in color single mechanism and the result greatly improved the large transverse momentum J / psi production rate, which is long-time awaited calculation. However, the QCD correction calculation to the transverse momentum distribution of J/psi polarization is more complicated and difficult, and more expected work. Wang’s group had worked on it.
They have systematic calculated the QCD corrections to color single J/psi production at the Tevatron and LHC, and found it changes J/psi polarization from transverse polarization at leading order to longitudinal polarization at the NLO QCD. This suggests that, QCD correction can dramatically alter the J/psi polarization at hadroproduction. This work was published in Phys.Rev.Lett.100: 232001, 2008. They subsequently made a part of the color-octet contribution calculations, and finally in 2011 and 2012, completed the calculation on the J/psi polarization of prompt J / psi hadroproduction at QCD next-to-leading order with including all color single, color octet, and Xi_c decay contribution. It is the first result at QCD NLO can be compared with experimental measurements. It is the curical results to solve or clarify the long-time J/psi polarization puzzle when comparing with the coming experimental measurements at the LHC. The work published in Phys. Rev. Lett. 110, 042002 (2013). They also do systematic study on QCD correction to inclusive J/psi production and double J/psi production at the B factory, and successfully explain the experimental results, the related work is published in Phys. Rev. Lett. 100:181803, 2008, Phys. Rev. Lett. 102,162003, (2009), and Phys. Rev. D.