From 902e266fc24f3d04ffc765e315ba4f86a81e30ca Mon Sep 17 00:00:00 2001
From: SuJeong Ji <120470463+SuJeong-Ji@users.noreply.github.com>
Date: Thu, 16 Apr 2026 00:22:27 +0900
Subject: [PATCH] Added physics constants for K1(1270)

---
 Common/Constants/include/CommonConstants/PhysicsConstants.h | 6 +++++-
 Common/Constants/include/CommonConstants/make_pdg_header.py | 2 ++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/Common/Constants/include/CommonConstants/PhysicsConstants.h b/Common/Constants/include/CommonConstants/PhysicsConstants.h
index 46aeff98d6033..e95b4343a63d4 100644
--- a/Common/Constants/include/CommonConstants/PhysicsConstants.h
+++ b/Common/Constants/include/CommonConstants/PhysicsConstants.h
@@ -92,7 +92,9 @@ enum Pdg {
   kHyperHelium4 = 1010020040,
   kHyperHelium5 = 1010020050,
   kHyperHelium4Sigma = 1110020040,
-  kLambda1520_Py = 102134
+  kLambda1520_Py = 102134,
+  kK1_1270_0 = 10313,
+  kK1_1270Plus = 10323
 };
 
 /// \brief Declarations of masses for additional particles
@@ -158,6 +160,8 @@ constexpr double MassHyperHelium4 = 3.921728;
 constexpr double MassHyperHelium5 = 4.839961;
 constexpr double MassHyperHelium4Sigma = 3.995;
 constexpr double MassLambda1520_Py = 1.5195;
+constexpr double MassK1_1270_0 = 1.253;
+constexpr double MassK1_1270Plus = 1.272;
 
 /// \brief Declarations of masses for particles in ROOT PDG_t
 constexpr double MassDown = 0.00467;
diff --git a/Common/Constants/include/CommonConstants/make_pdg_header.py b/Common/Constants/include/CommonConstants/make_pdg_header.py
index f83c44bb401db..ccea1863771f3 100755
--- a/Common/Constants/include/CommonConstants/make_pdg_header.py
+++ b/Common/Constants/include/CommonConstants/make_pdg_header.py
@@ -151,6 +151,8 @@ class Pdg(Enum):
     kHyperHelium5 = 1010020050
     kHyperHelium4Sigma = 1110020040
     kLambda1520_Py = 102134  # PYTHIA code different from PDG
+    kK1_1270_0 = 10313
+    kK1_1270Plus = 10323
 
 
 dbPdg = o2.O2DatabasePDG