Changed calculation of F1 to 2xF1 (a.k.a. F1)

NNPDF · Oct 18, 2023 · 56f1420 · 56f1420
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commit 56f1420
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diff --git a/src/yadism/esf/exs.py b/src/yadism/esf/exs.py
@@ -67,7 +67,7 @@ def xs_coeffs(kind, y, x=None, Q2=None, params=None):
         yp = 1.0
         yL = y**2 / (2 * (y**2 / 2 + (1 - y) - (mn * x * y) ** 2 / Q2))
     elif kind == "F1":
-        return np.array([1 / (2 * x), -1 / (2 * x), 0])
+        return np.array([1.0, -1.0, 0.0])
     elif kind == "XSFPFCC":
         INV_GEV_TO_PB = GEV_CM2_CONV / 100.0  # pb
         norm = (INV_GEV_TO_PB * params["GF"] ** 2) / (2.0 * np.pi)

diff --git a/tests/yadism/esf/test_exs.py b/tests/yadism/esf/test_exs.py
@@ -52,7 +52,7 @@ def test_xs_coeffs():
 
     f1 = xs_coeffs(
         "F1",
-        x=0.5,
+        x=1.0,
         Q2=1.0,
         y=0.0,
         params=dict(projectilePID=1, M2target=0.0, M2W=1.0),