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#ifndef CandUtils_helicityAngle_h
#define CandUtils_helicityAngle_h
/** helicityAngle
*
* Utility function that returns the helicity angle
* It is defined as the angle between the candidate
* momentum and one of the daughters momentum in the
* mother's center-of-mass reference frame.
* This angle has a two-fold ambiguity (h, pi - h ), and
* by convention the angle smaller than pi/2 is chosen.
*
* \author Luca Lista, INFN
*
* \version $Revision: 1.7 $
*
* $Id: helicityAngle.h,v 1.7 2007/12/11 08:42:52 hegner Exp $
*
*/
#include "DataFormats/Candidate/interface/CandidateFwd.h"
/// return the helicity angle for two particles.
double helicityAngle(const reco::Candidate& mother, const reco::Candidate& daughter);
/// return the helicity angle of a two body decay with daughter automatically retreived
/// Note: asserts if the candidate does not have two daughters
double helicityAngle(const reco::Candidate& c);
#endif
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