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Add luminosity channels #1762

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Jun 22, 2023
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Add luminosity channels #1762

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fc568a0
Add luminosity channels
Zaharid Jun 21, 2023
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Zaharid Jun 22, 2023
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3 changes: 2 additions & 1 deletion validphys2/examples/pdf_lumi_plots.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,8 @@ pdf: {id: "NNPDF40_nlo_as_01180", label: "4.0 NLO"}
sqrts: 13000 # GeV

lumi_channel: "gg" # one of [gg, gq, qqbar, qq, ddbar, uubar, ssbar,
# ccbar, bbbar, dubar, udbar, scbar, csbar, pp, gp]
# ccbar, bbbar, dubar, udbar, scbar, csbar, pp, gp,
# wlum, zlum]
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PDFscalespecs:
- xscale: log
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30 changes: 27 additions & 3 deletions validphys2/src/validphys/gridvalues.py
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Expand Up @@ -32,6 +32,8 @@
'csbar': r'c\bar{s}',
'pp': r'\gamma\gamma',
'gp': r'g\gamma',
'zlum': r'u\bar{u} + d\bar{d}',
'wlum': r'u\bar{d} + d\bar{u}',
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}

QUARK_COMBINATIONS = {
Expand Down Expand Up @@ -115,6 +117,15 @@ def central_grid_values(pdf: PDF, flmat, xmat, qmat):
# TODO: Investigate writting these in cython/cffi/numba/...


def _parton_pair_lumi_inner(pdf_set, n, mx, x1, x2, i, j):
"""Helper to evaluate lumis for pairs of partons."""
# fmt: off
return (
pdf_set.xfxQ(x1, mx, n, i)*pdf_set.xfxQ(x2, mx, n, j) +
pdf_set.xfxQ(x1, mx, n, j)*pdf_set.xfxQ(x2, mx, n, i)
)


def evaluate_luminosity(
pdf_set: LHAPDFSet, n: int, s: float, mx: float, x1: float, x2: float, channel
):
Expand Down Expand Up @@ -155,11 +166,24 @@ def evaluate_luminosity(

# as in the second of Eq.(4) in arXiv:1607.01831
res = sum(a*b for a,b in itertools.product(r1,r2))
elif channel == 'zlum':
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u, ubar = 2, -2
d, dbar = -1, 1
res = (
_parton_pair_lumi_inner(pdf_set=pdf_set, n=n, mx=mx, x1=x1, x2=x2, i=u, j=ubar) +
_parton_pair_lumi_inner(pdf_set=pdf_set, n=n, mx=mx, x1=x1, x2=x2, i=d, j=dbar)
)
elif channel == 'wlum':
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u, dbar = 2, -1
d, ubar = 1, -2
res = (
_parton_pair_lumi_inner(pdf_set=pdf_set, n=n, mx=mx, x1=x1, x2=x2, i=u, j=dbar) +
_parton_pair_lumi_inner(pdf_set=pdf_set, n=n, mx=mx, x1=x1, x2=x2, i=d, j=ubar)
)
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elif channel in QUARK_COMBINATIONS.keys():
i, j = QUARK_COMBINATIONS[channel]
res = (pdf_set.xfxQ(x1, mx, n, i) * pdf_set.xfxQ(x2, mx, n, j)
+ pdf_set.xfxQ(x1, mx, n, j) * pdf_set.xfxQ(x2, mx, n, i))

res = _parton_pair_lumi_inner(pdf_set=pdf_set, n=n, mx=mx, x1=x1, x2=x2, i=i, j=j)
else:
raise ValueError("Bad channel")
# fmt: on
Expand Down