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Fixing the 4-component version of GST #58

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Merged
kjmeagher merged 5 commits into from
May 5, 2026
Merged

Fixing the 4-component version of GST #58

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5c769a1
Correct the 4-component parameterization of GST
jsaffer May 21, 2025
6672f6e
Update GST_IT
jsaffer May 22, 2025
a998a23
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] May 23, 2025
f406ea7
Rename new flux model `GlobalFitGST4Comp` to keep _IT model the same
kjmeagher Apr 29, 2026
bd92a89
Apply suggestion from @kjmeagher
kjmeagher May 5, 2026
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2 changes: 2 additions & 0 deletions src/simweights/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,7 @@
"GenieSurface",
"GenieWeighter",
"GlobalFitGST",
"GlobalFitGST4Comp",
"GlobalFitGST_IT",
"GlobalSplineFit",
"GlobalSplineFit5Comp",
Expand Down Expand Up @@ -57,6 +58,7 @@
GaisserH4a_IT,
GaisserHillas,
GlobalFitGST,
GlobalFitGST4Comp,
GlobalFitGST_IT,
GlobalSplineFit,
GlobalSplineFit5Comp,
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33 changes: 33 additions & 0 deletions src/simweights/_fluxes.py
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Expand Up @@ -346,6 +346,39 @@ class GlobalFitGST_IT(CosmicRayFlux):
)


class GlobalFitGST4Comp(CosmicRayFlux):
r"""GlobalFitGST4Comp (4 populations) for four components [p, He, O, Fe].

The Oxygen group is the sum of Carbon and Oxygen groups.
The Iron group is the sum of Iron, Tellurium and Mercury groups.
Provided by J. Saffer.
"""

pdgids = PDGID_4COMP
_funcs = (
lambda E: (
0.7000 * E**-2.66 * exp(-E / 1.2e5)
+ 0.0150 * E**-2.4 * exp(-E / 4e6)
+ 0.0012 * E**-2.4 * exp(-E / 1.5e9)
+ 0.00012 * E**-2.4 * exp(-E / 40e9)
),
lambda E: 0.3200 * E**-2.58 * exp(-E / 1.2e5 / 2) + 0.0065 * E**-2.3 * exp(-E / 4e6 / 2),
lambda E: (
0.0100 * E**-2.40 * exp(-E / 1.2e5 / 6)
+ 0.0006 * E**-2.3 * exp(-E / 4e6 / 6)
+ 0.0130 * E**-2.40 * exp(-E / 1.2e5 / 8)
+ 0.0007 * E**-2.3 * exp(-E / 4e6 / 8)
),
lambda E: (
0.0060 * E**-2.30 * exp(-E / 1.2e5 / 26)
+ 0.00021 * E**-2.2 * exp(-E / 4e6 / 26)
+ 0.0000011 * E**-2.2 * exp(-E / 1.5e9 / 26)
+ 0.00001 * E**-2.2 * exp(-E / 4e6 / 52)
+ 0.000053 * E**-2.2 * exp(-E / 4e6 / 80)
),
)


class GlobalSplineFitBase(CosmicRayFlux):
r"""Data-driven spline fit of the cosmic ray spectrum by Dembinski et. al. \ [#GSFDembinski]_.

Expand Down
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