Add header for flag enumeration

Author: vkucera

PWGHF/Core/DecayChannels.h

@@ -0,0 +1,142 @@
+// 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 DecayChannels.h
+/// \brief Definitions of constants for MC flagging of decay channels.
+/// \author Vít Kučera <vit.kucera@cern.ch>, Inha University
+/// \note Daughter ordering convention: (charm|strange|π±|K±|π0), (baryon|meson), (+|−)
+
+#ifndef PWGHF_CORE_DECAYCHANNELS_H_
+#define PWGHF_CORE_DECAYCHANNELS_H_
+
+#include <cstdint>
+
+namespace o2::hf_decay
+{
+
+// TODO
+// - HF cascades (Λc+ → p K0short)
+// - HF cascades to LF cascades (Ωc0/Ξc0 → Ξ+ π−, Ξc+ → Ξ+ π− π+)
+
+namespace hf_cand_2prong
+{
+/// @brief 2-prong candidates
+enum DecayChannel : int8_t {
+  // D0
+  D0ToPiK = 1, // π+ K−
+  D0ToPiKPi0,  // π+ K− π0
+  D0ToPiPi,    // π+ π−
+  D0ToPiPiPi0, // π+ π− π0
+  D0ToKK,      // K+ K−
+  //
+  Last
+};
+} // namespace hf_cand_2prong
+
+namespace hf_cand_3prong
+{
+/// @brief 3-prong candidates
+enum DecayChannel : int8_t {
+  // D+
+  DplusToPiKPi = 1, // π+ K− π+
+  DplusToPiKPiPi0,  // π+ K− π+ π0
+  DplusToPiPiPi,    // π+ π− π+
+  DplusToPiKK,      // π+ K− K+
+  DplusToPhiPi,     // φ π+
+  DplusToK0starK,   // K0* K+
+  // Ds+
+  DsToPiKK,      // π+ K− K+
+  DsToPiKKPi0,   // π+ K− K+ π0
+  DsToPiPiK,     // π+ π− K+
+  DsToPiPiPiPi0, // π+ π− π+ π0
+  DsToPhiPi,     // φ π+
+  DsToK0starK,   // K0* K+
+  // Λc+
+  LcToPKPi,    // p K− π+
+  LcToPKPiPi0, // p K− π+ π0
+  LcToPPiPi,   // p π− π+
+  LcToPKK,     // p K− K+
+  // Ξc+
+  XicToPKPi,  // p K− π+
+  XicToPKK,   // p K− K+
+  XicToSPiPi, // Σ+ π− π+
+  //
+  Last
+};
+} // namespace hf_cand_3prong
+
+namespace hf_cand_dstar
+{
+/// @brief D*+ candidates
+enum DecayChannel : int8_t {
+  // D*+
+  DstarToPiKPiPi0 = 1, // π+ K− π+ π0 (from [(D0 → π+ K− π0) π+] or [(D+ → π+ K− π+) π0])
+  //
+  Last
+};
+} // namespace hf_cand_dstar
+
+namespace hf_cand_b0
+{
+/// @brief B0 candidates
+enum DecayChannel : int8_t {
+  // B0
+  B0ToDminusPi = 1,  // D− π+
+  B0ToDminusK,       // D− K+
+  B0ToDminusRhoplus, // D− ρ+
+  B0ToD0PiPi,        // D0bar π+ π−
+  //
+  Last
+};
+} // namespace hf_cand_b0
+
+namespace hf_cand_bplus
+{
+/// @brief B+ candidates
+enum DecayChannel : int8_t {
+  // B+
+  BplusToD0Pi = 1,  // D0bar π+
+  BplusToD0K,       // D0bar K+
+  BplusToD0Rhoplus, // D0bar ρ+
+  BplusToD0starPi,  // D0*bar π+
+  //
+  Last
+};
+} // namespace hf_cand_bplus
+
+namespace hf_cand_bs
+{
+/// @brief Bs0 candidates
+enum DecayChannel : int8_t {
+  // Bs0
+  BsToDsPi = 1,  // Ds− π+
+  BsToDsRhoplus, // Ds− ρ+
+  //
+  Last
+};
+} // namespace hf_cand_bs
+
+namespace hf_cand_lb
+{
+/// @brief Λb0 candidates
+enum DecayChannel : int8_t {
+  // Λb0
+  LbToLcPi = 1, // Λc+ π−
+  LbToLcK,      // Λc+ K−
+  LbToScK,      // Σc+ K−
+  //
+  Last
+};
+} // namespace hf_cand_lb
+
+} // namespace o2::hf_decay
+
+#endif // PWGHF_CORE_DECAYCHANNELS_H_