TCS/cross_section/TCSCrossSectionDifferenceCU.h

0001 #ifndef TCSCROSSSECTIONDIFFERENCECU_H
0002 #define TCSCROSSSECTIONDIFFERENCECU_H
0003
0004 /**
0005  * @file TCSCrossSectionDifferenceCU.h
0006  * @author Pawel Sznajder (IPNO)
0007  * @date November 25, 2016
0008  * @version 1.0
0009  */
0010
0011 #include <string>
0012
0013 #include "../../../../beans/gpd/GPDType.h"
0014 #include "../../../../beans/List.h"
0015 #include "../../../../utils/type/PhysicalType.h"
0016 #include "../TCSObservable.h"
0017
0018 namespace PARTONS {
0019
0020 /**
0021  * @class TCSCrossSectionDifferenceCU
0022  * @brief Difference of cross-sections obtained with two states of incoming photon circular polarization.
0023  *
0024  * Definition:<br>
0025  *
0026  * \f$ \displaystyle
0027  * \Delta\frac{\mathrm{d}^4\sigma_{UU}}{\mathrm{d}|t| \mathrm{d}Q^2 \mathrm{d}\phi \mathrm{d}\theta}\left(t, Q^2, \phi, \theta\right) =
0028  * \frac{1}{2}\left(
0029  * \frac{\mathrm{d}^4\sigma^{+}_{UU}}{\mathrm{d}|t| \mathrm{d}Q^2 \mathrm{d}\phi \mathrm{d}\theta}\left(t, Q^2, \phi, \theta\right) -
0030  * \frac{\mathrm{d}^4\sigma^{-}_{UU}}{\mathrm{d}|t| \mathrm{d}Q^2 \mathrm{d}\phi \mathrm{d}\theta}\left(t, Q^2, \phi, \theta\right)\, .
0031  * \right)
0032  * \f$
0033  *
0034  * Unit: \f$\mathrm{nbarn}/\mathrm{GeV}^4\f$.
0035  */
0036 class TCSCrossSectionDifferenceCU: public TCSObservable {
0037
0038 public:
0039
0040     /**
0041      * Unique ID to automatically register the class in the registry.
0042      */
0043     static const unsigned int classId;
0044
0045     /**
0046      * Constructor.
0047      * @param className Name of class.
0048      */
0049     TCSCrossSectionDifferenceCU(const std::string &className);
0050
0051     /**
0052      * Destructor.
0053      */
0054     virtual ~TCSCrossSectionDifferenceCU();
0055
0056     virtual TCSCrossSectionDifferenceCU* clone() const;
0057
0058 protected:
0059
0060     /**
0061      * Copy constructor.
0062      * @param other Object to be copied.
0063      */
0064     TCSCrossSectionDifferenceCU(const TCSCrossSectionDifferenceCU &other);
0065
0066     virtual PhysicalType<double> computeObservable(
0067             const TCSObservableKinematic& kinematic,
0068             const List<GPDType>& gpdType);
0069 };
0070
0071 } /* namespace PARTONS */
0072
0073 #endif /* TCSCROSSSECTIONDIFFERENCECU_H */