Requires the grid files:
bb01_xpdf_lo_8pN.grid
bb01_xpdf_lo_8pS.grid
bb01_xpdf_nlo_8pN.grid
bb01_xpdf_nlo_8pS.grid
ppdf.uu
is a tarred, gzipped and uuencoded version of the complete
package (1.72 MB).
Reference: hep-ph/0203155
********************************************************************* * * * POLARIZED PARTON DISTRIBUTION FUNCTION WITH ERRORS * * FOR LO AND NLO * * * * Johannes Bluemlein and Helmut Boettcher * * hep-ph/0203155 * * * * PROBLEMS/QUESTIONS TO blumlein@ifh.de OR hboett@ifh.de * * * * INPUT: iset = number of the parton set : * * * * iset = 1 LEADING ORDER - Scenario 1 * * data file: bb01_xpdf_lo_8pN.grid * * * * iset = 2 LEADING ORDER - Scenario 2 * * data file: bb01_xpdf_lo_8pS.grid * * * * iset = 3 NEXT-TO-LEADING ORDER (MS-bar) - Scenario 1 * * data file: bb01_xpdf_nlo_8pN.grid * * * * iset = 4 NEXT-TO-LEADING ORDER (MS-bar) - Scenario 2 * * data file: bb01_xpdf_nlo_8pS.grid * * * * x = Bjorken-x (between 1.0E-9 and 1.0E+0) * * q2 = scale in GeV**2 (between 0.1E+1 and 1.0E+6) * * * * OUTPUT: UV = DELTA u_v & error: DUV * * DV = DELTA d_v & error: DDV * * GL = DELTA gluon & error: DGL * * QB = DELTA qbar & error: DQB * * G1P = g_1^proton & error: DG1P * * G1N = g_1^neutron & error: DG1N * * * * NOTE: * * ----- * * For the parton distributions and for g1(p,n) * * always x times the distribution is returned. * * * * The sets are the result of a combined fit to the * * world data for the spin asymmetries, i.e. A_1(p,n,d) * * or g_1/F_1(p,n,d). * * * * The subroutine PPDF returns the BB polarized parton * * distribution function values and g1(p,n) at the given * * point in Q**2 and XB by interpolating the data on the * * specified grid. * * * * Note: No charm is included * * * * COMMON: The main program or the calling routine has to have * * a common block COMMON / INTINI / IINI , and IINI * * has always to be ZERO when POLPDF is called for the * * first time or when 'ISET' has been changed. * * * *********************************************************************