extend implementation of m_W observable (#241)

flav-io · Dec 3, 2023 · d4d3619 · d4d3619
1 parent ea92f02
commit d4d3619
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Showing 3 changed files with 13 additions and 2 deletions.
diff --git a/flavio/data/parameters_metadata.yml b/flavio/data/parameters_metadata.yml
@@ -13,6 +13,13 @@ s2w:
   tex: $\sin^2 \hat\theta_w(m_Z)$
   description: sine squared of the weak mixing angle in the $\overline{\text{MS}}$ scheme at the scale $m_Z$
 
+Delta_alpha_e_had:
+  tex: $\Delta\alpha_{\rm had}^{(5)}(m_Z)$
+  description: hadronic contribution to the running of the electromagnetic fine structure constant between 0 and $m_Z$
+Delta_alpha_e_lep:
+  tex: $\Delta\alpha_{\rm lep}(m_Z)$
+  description: leptonic contribution to the running of the electromagnetic fine structure constant between 0 and $m_Z$
+
 
 # CKM parameters
 

diff --git a/flavio/data/parameters_uncorrelated.yml b/flavio/data/parameters_uncorrelated.yml
@@ -29,6 +29,10 @@ alpha_s: 0.1182(8)    # FLAG 2019
 s2w: 0.23129(5)       # PDG 2017
 
 
+Delta_alpha_e_had: 0.027572 ± 0.000359 # hep-ph/0104304 page 5
+Delta_alpha_e_lep: 0.0314977 # hep-ph/9803313 table 1
+
+
 # CKM parameters
 
 Vus: 0.2248(8)   # FLAG 2017 Nf=2+1+1
@@ -560,7 +564,7 @@ PDFmembers avg=0 replicas=1-100:
 delta_BsKstarmumu: 0 ± 0.078
 
 # Updated EM corrections for Ke3 decays
-# From 2103.04843 (Table VI) 
+# From 2103.04843 (Table VI)
 # Uncertainties combined in quadrature, factor of 2 normalisation difference since
 # flavio used the normalisation of 1005.2323
 K0e3 delta_EM: 0.580(16)1e-2

diff --git a/flavio/physics/wdecays/mw.py b/flavio/physics/wdecays/mw.py
@@ -15,7 +15,7 @@ def mW_SM(par):
     dh = (par['m_h'] / 100)**2
     dt = (par['m_t'] / 174.3)**2 - 1
     dZ = par['m_Z'] / 91.1875 - 1
-    dalpha = 0  # FIXME
+    dalpha = (par['Delta_alpha_e_had']+par['Delta_alpha_e_lep']) / 0.05907 - 1
     dalphas = par['alpha_s'] / 0.119 - 1
     m0W = 80.3779
     c1 = 0.05427