[u/mrichter/AliRoot.git] / HLT / MUON / OnlineAnalysis / AliHLTMUONCalculations.h

#ifndef ALIHLTMUONCALCULATIONS_H
#define ALIHLTMUONCALCULATIONS_H
/* Copyright(c) 1998-2007, ALICE Experiment at CERN, All rights reserved. *
 * See cxx source for full Copyright notice                               */

/* $Id$ */

////////////////////////////////////////////////////////////////////////////////
//
// Author: Artur Szostak
// Email:  artur@alice.phy.uct.ac.za | artursz@iafrica.com
//
////////////////////////////////////////////////////////////////////////////////

#include "AliHLTMUONDataTypes.h"

/*
 * Note: this class is not reentrant so thread protection must be explicit in
 * any multi-threaded usage.
 */
class AliHLTMUONCalculations
{
public:

	/* Computes the momentum components based on the equations given in the
	   ALICE dimuon spectrometer Technical Design Report (TDR-5): trigger section.
	   
	   Reference: 
	     "CERN/LHCC 2000-046
	      Addendum 1 to ALICE TDR 5
	      15 Dec 2000"
	     
	     Section 3.1.2 pages 144 and 145.
	     
	   Input can be in meters, cm or mm. 
	   Output is in GeV.
	 */
	static bool ComputeMomentum(
			AliHLTFloat32_t x1,
			AliHLTFloat32_t y1, AliHLTFloat32_t y2,
			AliHLTFloat32_t z1, AliHLTFloat32_t z2
		);
		
	static AliHLTFloat32_t Zf() { return fgZf; }
	static void Zf(AliHLTFloat32_t value) { fgZf = value; }
	static AliHLTFloat32_t QBL();
	static void QBL(AliHLTFloat32_t value);
	
	static AliHLTMUONParticleSign Sign() { return fgSign; }
	static AliHLTFloat32_t Px() { return fgPx; }
	static AliHLTFloat32_t Py() { return fgPy; }
	static AliHLTFloat32_t Pz() { return fgPz; }
		
private:

	// Prevent destroying or creating of this object.
	AliHLTMUONCalculations();
	~AliHLTMUONCalculations();

	static AliHLTFloat32_t fgZf;  // The Z coordinate of the middle of the dipole magnetic field.
	static AliHLTFloat32_t fgQBLScaled; // The integrated field strength times units of charge (T.m.*c/1e9)
	
	static AliHLTMUONParticleSign fgSign;  // The calculated sign.
	static AliHLTFloat32_t fgPx;  // The calculated X momentum (GeV/c).
	static AliHLTFloat32_t fgPy;  // The calculated Y momentum (GeV/c).
	static AliHLTFloat32_t fgPz;  // The calculated Z momentum (GeV/c).
};

#endif // ALIHLTMUONCALCULATIONS_H
Commit	Line	Data
364df03a	1	#ifndef ALIHLTMUONCALCULATIONS_H
	2	#define ALIHLTMUONCALCULATIONS_H
	3	/* Copyright(c) 1998-2007, ALICE Experiment at CERN, All rights reserved. *
	4	* See cxx source for full Copyright notice */
	5
	6	/* $Id$ */
	7
	8	////////////////////////////////////////////////////////////////////////////////
	9	//
	10	// Author: Artur Szostak
	11	// Email: artur@alice.phy.uct.ac.za \| artursz@iafrica.com
	12	//
	13	////////////////////////////////////////////////////////////////////////////////
	14
	15	#include "AliHLTMUONDataTypes.h"
	16
b92524d0	17	/*
	18	* Note: this class is not reentrant so thread protection must be explicit in
	19	* any multi-threaded usage.
364df03a	20	*/
e6357f88	21	class AliHLTMUONCalculations
	22	{
	23	public:
	24
b92524d0	25	/* Computes the momentum components based on the equations given in the
	26	ALICE dimuon spectrometer Technical Design Report (TDR-5): trigger section.
	27
	28	Reference:
	29	"CERN/LHCC 2000-046
	30	Addendum 1 to ALICE TDR 5
	31	15 Dec 2000"
	32
	33	Section 3.1.2 pages 144 and 145.
	34
	35	Input can be in meters, cm or mm.
	36	Output is in GeV.
	37	*/
e6357f88	38	static bool ComputeMomentum(
	39	AliHLTFloat32_t x1,
	40	AliHLTFloat32_t y1, AliHLTFloat32_t y2,
	41	AliHLTFloat32_t z1, AliHLTFloat32_t z2
	42	);
	43
	44	static AliHLTFloat32_t Zf() { return fgZf; }
	45	static void Zf(AliHLTFloat32_t value) { fgZf = value; }
b92524d0	46	static AliHLTFloat32_t QBL();
b92524d0	47	static void QBL(AliHLTFloat32_t value);
e6357f88	48
	49	static AliHLTMUONParticleSign Sign() { return fgSign; }
	50	static AliHLTFloat32_t Px() { return fgPx; }
	51	static AliHLTFloat32_t Py() { return fgPy; }
	52	static AliHLTFloat32_t Pz() { return fgPz; }
	53
	54	private:
	55
	56	// Prevent destroying or creating of this object.
	57	AliHLTMUONCalculations();
	58	~AliHLTMUONCalculations();
	59
	60	static AliHLTFloat32_t fgZf; // The Z coordinate of the middle of the dipole magnetic field.
b92524d0	61	static AliHLTFloat32_t fgQBLScaled; // The integrated field strength times units of charge (T.m.*c/1e9)
e6357f88	62
e6357f88	63	static AliHLTMUONParticleSign fgSign; // The calculated sign.
b92524d0	64	static AliHLTFloat32_t fgPx; // The calculated X momentum (GeV/c).
	65	static AliHLTFloat32_t fgPy; // The calculated Y momentum (GeV/c).
	66	static AliHLTFloat32_t fgPz; // The calculated Z momentum (GeV/c).
e6357f88	67	};
364df03a	68
364df03a	69	#endif // ALIHLTMUONCALCULATIONS_H