Jian-Xiong Wang

Next-to-leading-order QCD corrections to J/psi polarization at Tevatron and Large-Hadron-Collider energies

The next to leading order (NLO) QCD corrections to J/ψ polarization of hadronproduction at Tevatron and LHC are calculated. The results show that the J/ψ polarization is extremely changed from more transversal polarization at leading order (LO) into more longitudinal polarization at NLO. Although it gives more longitudinal polarization than the recent experimental result on the J/ψ polarization at Tevatron. It sheds light on the solution to the large discrepancy of J/ψ polarization between theoretical predication and experimental measurement, and suggests that the next important step is to calculate the NLO correction for color octet state J/ψ hadronproduction. Our calculations are performed in two ways where the polarizations are summed analytically or not, and they are checked with each other. It also gives a K factor for total cross section (ratio of NLO to LO) of about 2 and shows that the NLO corrections boost the J/ψ production for about 2 order of magnitude in high transverse momentum pt region of J/ψ, which confirms the calculation by Campbell, Maltoni and Tramontano.

BCVEGPY2.0: A Upgrade version of the generator BCVEGPY with an addendum about hadroproduction of the P-wave B(c) states

The generator BCVEGPY is upgraded by adding the hadroproduction of the

BCVEGPY2.0: An upgraded version of the generator BCVEGPY with the addition of hadroproduction of the P-wave B-c states

P

An upgraded version of the generator BCVEGPY2.0 for hadronic production of Bc meson and its excited states

-wave excited

QCD corrections to polarization of

B_c

J/\psi

states (denoted by

and

B_{cJ,L=1}^*

\upsilon

or by

at Tevatron and LHC

h_{B_c}

Next-to-leading-order QCD corrections to J/ψ(ϒ)+γ production at the LHC

and