HOPPET constants

Auto-generated constants reference for the hoppet module.

PDF indices

These are the PDF indices of lists that are returned by e.g. Eval() or that are to be passed to EvalIFlv().: Note that index 13, not listed below, is used to encode information about the PDF flavour representation.

hoppet.iflv_b = 11

hoppet.iflv_bbar = 1

hoppet.iflv_c = 10

hoppet.iflv_cbar = 2

hoppet.iflv_d = 7

hoppet.iflv_dbar = 5

hoppet.iflv_electron = 15

hoppet.iflv_g = 6

hoppet.iflv_info = 13

hoppet.iflv_max = 12

hoppet.iflv_min = 0

hoppet.iflv_min_fortran = -6

hoppet.iflv_muon = 16

hoppet.iflv_photon = 14

hoppet.iflv_s = 9

hoppet.iflv_sbar = 3

hoppet.iflv_t = 12

hoppet.iflv_tau = 17

hoppet.iflv_tbar = 0

hoppet.iflv_u = 8

hoppet.iflv_ubar = 4

Factorisation schemes

hoppet.factscheme_DIS = 2

hoppet.factscheme_FragMSbar = 4

hoppet.factscheme_MSbar = 1

hoppet.factscheme_PolMSbar = 3

NNLO splitting function choices

hoppet.nnlo_splitting_Nfitav = 0

hoppet.nnlo_splitting_Nfiterr1 = 1

hoppet.nnlo_splitting_Nfiterr2 = 2

hoppet.nnlo_splitting_exact = -2

hoppet.nnlo_splitting_param = -1

NNLO mass threshold choices

hoppet.nnlo_nfthreshold_exact = -12

hoppet.nnlo_nfthreshold_param = -11

N3LO splitting function approximations

hoppet.n3lo_splitting_approximation_up_to_2310 = 100

hoppet.n3lo_splitting_approximation_up_to_2310_05744 = 100

hoppet.n3lo_splitting_approximation_up_to_2404 = 101

hoppet.n3lo_splitting_approximation_up_to_2404_09701 = 101

hoppet.n3lo_splitting_approximation_up_to_2410 = 102

hoppet.n3lo_splitting_approximation_up_to_2410_08089 = 102

hoppet.n3lo_splitting_approximation_up_to_2512 = 103

N3LO splitting function choices

hoppet.n3lo_splitting_Nfitav = 0

hoppet.n3lo_splitting_Nfiterr1 = 1

hoppet.n3lo_splitting_Nfiterr2 = 2

hoppet.n3lo_splitting_exact = -2

hoppet.n3lo_splitting_param = -1

N3LO mass threshold choices

hoppet.n3lo_nfthreshold_exact_fortran = 2

hoppet.n3lo_nfthreshold_libOME = 1

hoppet.n3lo_nfthreshold_libOME_2510 = 3

hoppet.n3lo_nfthreshold_libOME_2512 = 1

hoppet.n3lo_nfthreshold_off = 0

hoppet.n3lo_nfthreshold_on = 1

Convolution communicator pieces

hoppet.cc_DELTA = 4

hoppet.cc_REAL = 1

hoppet.cc_REALVIRT = 3

hoppet.cc_VIRT = 2

Structure function indices

These constants label the various structure functions used in HOPPET

F1 W+ : \(d+\bar{u}\)

F2 W+ : \(d + \bar{u}\)

F3 W+ : \(d + \bar{u}\)

F1 W- : \(\bar{d} + u\)

F2 W- : \(\bar{d} + u\)

F3 W- : \(\bar{d} + u\)

F1 Z : \((d + \bar{d}) v_d^2 a_d^2 + (u + \bar{u}) v_u^2 a_u^2\)

F2 Z : \((d + \bar{d}) v_d^2 a_d^2 + (u + \bar{u}) v_u^2a_u^2\)

F3 Z : \((d + \bar{d}) 2 v_d a_d + (u + \bar{u}) 2 v_u a_u\)

F1 γ : \((d + \bar{d}) e^2_d + (u + \bar{u}) e^2_u\)

F2 γ : \((d + \bar{d}) e^2_d + (u + \bar{u}) e^2_u\)

F1 γZ : \((d + \bar{d}) e_d 2v_d + (u + \bar{u}) e_u 2v_u\)

F2 γZ : \((d + \bar{d}) e_d 2v_d + (u + \bar{u}) e_u 2v_u\)

F3 γZ : \((d + \bar{d}) e_d 2a_d + (u + \bar{u}) e_u 2a_u\)

where the \(u\) and \(d\) refer to the sum over up- and down-type quarks, and \(v_i\), \(a_i\), and \(e_i\) are the vector, axial, and electric charges of an \(i\)-type quark.

hoppet.iF1EM = 2

hoppet.iF1Wm = 5

hoppet.iF1Wp = 7

hoppet.iF1Z = 10

hoppet.iF1gZ = 6

hoppet.iF2EM = 1

hoppet.iF2Wm = 4

hoppet.iF2Wp = 8

hoppet.iF2Z = 11

hoppet.iF2gZ = 0

hoppet.iF3Wm = 3

hoppet.iF3Wp = 9

hoppet.iF3Z = 12

hoppet.iF3gZ = 13

Structure function scale choices

hoppet.scale_choice_Q = 1

hoppet.scale_choice_arbitrary = 2

hoppet.scale_choice_fixed = 0

Other constants

hoppet.ncompmax = 13

hoppet.ncompmin = 0