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utilsCorrelations.h

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+// Copyright 2019-2020 CERN and copyright holders of ALICE O2.
+// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
+// All rights not expressly granted are reserved.
+//
+// This software is distributed under the terms of the GNU General Public
+// License v3 (GPL Version 3), copied verbatim in the file "COPYING".
+//
+// In applying this license CERN does not waive the privileges and immunities
+// granted to it by virtue of its status as an Intergovernmental Organization
+// or submit itself to any jurisdiction.
+
+/// \file utilsCorrelations.h
+/// \brief Utilities for HFC analyses
+
+#ifndef UTILS_CORRELATIONS_H
+#define UTILS_CORRELATIONS_H
+
+#include <TString.h>
+#include <cmath>
+
+enum Region {
+  Default = 0,
+  Toward,
+  Away,
+  Transverse
+};
+
+Region getRegion(double deltaPhi)
+{
+  if (std::abs(deltaPhi) < o2::constants::math::PI / 3.) {
+    return Toward;
+  } else if (deltaPhi > 2. * o2::constants::math::PI / 3. && deltaPhi < 4. * o2::constants::math::PI / 3.) {
+    return Away;
+  } else {
+    return Transverse;
+  }
+}
+
+#endif // UTILS_CORRELATIONS_H