smash::I_tot_range Class Reference

#include <clebschgordan.h>

Range of total isospin for reaction of particle a with particle b.

Definition at line 68 of file clebschgordan.h.

Classes
class	iterator
	Iterator class for determination of total isospin. More...

Public Member Functions
	I_tot_range (const ParticleType &p_a, const ParticleType &p_b)
	Get the allowed range of total isospin for a collision a + b. More...
	I_tot_range (const ParticleType &p_a, const ParticleType &p_b, const ParticleType &p_c, const ParticleType &p_d)
	Get the allowed range of total isospin for a collision a + b <-> c + d. More...
iterator	begin ()
iterator	end ()

Private Attributes
int	I_min_
	Value of minimum total isospin. More...
int	I_max_
	Value of maximum total isospin. More...

Constructor & Destructor Documentation

I_tot_range() [1/2]

smash::I_tot_range::I_tot_range ( const ParticleType &  p_a, const ParticleType &  p_b  )

inline

Get the allowed range of total isospin for a collision a + b.

Parameters

p_a	Particle a.
p_b	Particle b.

Returns

Maximum and minimum of allowed values.

Definition at line 82 of file clebschgordan.h.

                                                                {
    // Compute total isospin range with given particles.
    const int I_z_abs = std::abs(p_a.isospin3() + p_b.isospin3());
    I_max_ = p_a.isospin() + p_b.isospin();
    I_min_ = std::max(std::abs(p_a.isospin() - p_b.isospin()), I_z_abs);
  }

I_tot_range() [2/2]

smash::I_tot_range::I_tot_range ( const ParticleType &  p_a, const ParticleType &  p_b, const ParticleType &  p_c, const ParticleType &  p_d  )

inline

Get the allowed range of total isospin for a collision a + b <-> c + d.

Parameters

p_a	Particle a.
p_b	Particle b.
p_c	Particle c.
p_d	Particle d.

Returns

Maximum and minimum of allowed values or empty range, if reaction is forbidden due to isospin.

Definition at line 98 of file clebschgordan.h.

                                                                {
    // Compute total isospin range with given initial and final particles.
    const int I_z = p_a.isospin3() + p_b.isospin3();
    if (I_z != p_c.isospin3() + p_d.isospin3()) {
      /* This reaction is forbidden by isospin conservation.
       * Set impossible values to make sure an empty range is returned. */
      I_min_ = 1;
      I_max_ = 0;
      return;
    }
    I_max_ =
        std::min(p_a.isospin() + p_b.isospin(), p_c.isospin() + p_d.isospin());
    I_min_ = std::max(std::abs(p_a.isospin() - p_b.isospin()),
                      std::abs(p_c.isospin() - p_d.isospin()));
    I_min_ = std::max(I_min_, std::abs(I_z));
  }

Member Function Documentation

begin()

iterator smash::I_tot_range::begin ( )

inline

Returns

Beginning of iterator.

Definition at line 172 of file clebschgordan.h.

{ return iterator(I_max_, *this); }

end()

iterator smash::I_tot_range::end ( )

inline

Returns

End of iterator.

Definition at line 174 of file clebschgordan.h.

                 {
    if (I_min_ > I_max_) {
      return begin();
    }
    return iterator(I_min_ - 2, *this);
  }

Member Data Documentation

I_min_

int smash::I_tot_range::I_min_

private

Value of minimum total isospin.

Definition at line 71 of file clebschgordan.h.

I_max_

int smash::I_tot_range::I_max_

private

Value of maximum total isospin.

Definition at line 73 of file clebschgordan.h.

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The documentation for this class was generated from the following file:

• src/include/smash/clebschgordan.h