From a9b9a197302bf063dc60ca62fd8c6bbc569da0c7 Mon Sep 17 00:00:00 2001
From: Pritam Chakraborty <47203359+prchakra@users.noreply.github.com>
Date: Tue, 29 Jul 2025 16:51:31 +0200
Subject: [PATCH] [PWGCF] FemtoUniverse: Fixing the bug in phi calculation at R

---
 PWGCF/FemtoUniverse/Core/FemtoUniverseDetaDphiStar.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/PWGCF/FemtoUniverse/Core/FemtoUniverseDetaDphiStar.h b/PWGCF/FemtoUniverse/Core/FemtoUniverseDetaDphiStar.h
index a8a9b2daf57..65344e45bba 100644
--- a/PWGCF/FemtoUniverse/Core/FemtoUniverseDetaDphiStar.h
+++ b/PWGCF/FemtoUniverse/Core/FemtoUniverseDetaDphiStar.h
@@ -580,7 +580,7 @@ class FemtoUniverseDetaDphiStar
     for (size_t i = 0; i < 9; i++) {
       double arg = 0.3 * charge * magfield * TmpRadiiTPC[i] * 0.01 / (2. * pt);
       if (std::abs(arg) < 1.0) {
-        tmpVec.push_back(phi0 - std::asin(arg));
+        tmpVec.push_back(phi0 + std::asin(arg));
       } else {
         tmpVec.push_back(999.0);
       }