9,038 research outputs found
NNLO QCD Corrections to Exclusive Production in Electron-Positron Collision
Based on the NRQCD factorization formalism, we calculate the
next-to-next-to-leading order QCD corrections to the heavy quarkonium production associated with a photon at electron-positron colliders.
By matching the amplitudes calculated in full QCD theory to a series of
operators in NRQCD, the short-distance coefficients up to NNLO QCD radiative
corrections are determined. It turns out that the full set of master integrals
that we obtained could be analytically expressed in terms of Goncharov
Polylogarithms, Chen's iterated integrals, and elliptic functions, which mostly
do not exist in the literature and could be employed in the analyses of other
physical processes. In phenomenology, numerical calculations of NNLO K-factors
and cross sections of processes in
BESIII and B-factory experiments are performed, which may stand as a test of
the NRQCD higher order calculation while confronting to the data.Comment: 12 pages, 5 firue
- …