Hybrid scheme for heavy flavors: Merging the fixed flavor number scheme and variable flavor number scheme

作者：Kusina A^*; Olness F I; Schienbein I; Jezo T; Kovarik K; Stavreva T; Yu J Y

来源：Physical Review D - Particles, Fields, Gravitation and Cosmology, 2013, 88(7): 074032.

DOI：10.1103/PhysRevD.88.074032

We introduce a hybrid variable flavor number scheme for heavy flavors, denoted H-VFNS, which incorporates the advantages of both the traditional variable flavor number scheme as well as the fixed flavor number scheme (FFNS). By including an explicit N-F dependence in both the parton distribution functions (PDFs) and the strong coupling constant alpha(S), we generate coexisting sets of PDFs and alpha(S) for N-F = {3, 4, 5, 6} at any scale mu that are related analytically by the (MS) over bar matching conditions. The H-VFNS resums the heavy quark contributions and provides the freedom to choose the optimal N-F for each particular data set. Thus, we can fit selected HERA data in a FFNS framework, while retaining the benefits of the VFNS to analyze LHC data at high scales. We illustrate how such a fit can be implemented for the case of both HERA and LHC data.

• 出版日期2013-10-28